Best plants
Overwatering kills more houseplants than neglect. These species are built to dry out — the most forgiving, hard-to-kill choices if you travel, forget, or simply want fewer chores.
How this list is built: houseplants whose documented watering rhythm is infrequent (they prefer to dry out fully between waterings)— filtered from Growli's structured plant-care library, not hand-picked, so it stays consistent and checkable.
| Plant | Light | Water | Pets |
|---|---|---|---|
| Abelia 'Edward Goucher' | Direct sun (at least 4-6 hours) | Water weekly while establishing; mature plants are drought-tolerant and need water only in prolonged dry weather | Mildly toxic to pets |
| Abelia 'Kaleidoscope' | Direct sun (at least 4-6 hours) | Weekly during establishment, then only in extended drought | Mildly toxic to pets |
| Abelia 'Rose Creek' | Direct sun (at least 4-6 hours) | Weekly while establishing, then occasional deep watering in drought | Mildly toxic to pets |
| Abelia chinensis | Direct sun (at least 4-6 hours) | Weekly through the first season, then mainly during dry spells | Mildly toxic to pets |
| Abelia x grandiflora | Direct sun (at least 4-6 hours) | Weekly deep soak in the first season, then only during prolonged dry spells once established | Mildly toxic to pets |
| Abiu | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry out, around every 4-7 days in active growth | Mildly toxic to pets |
| Abyssinian Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Açaí Palm | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water whenever the surface starts to dry, often every 2-4 days | Mildly toxic to pets |
| Acer capillipes | Bright indirect light (just back from a sunny window) | Water deeply weekly while establishing; supplement in summer droughts | Pet-safe |
| Acer griseum | Direct sun (at least 4-6 hours) | Water deeply weekly while establishing; supplement in summer droughts | Pet-safe |
| Acer palmatum 'Atropurpureum' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply through dry weather | Pet-safe |
| Acer palmatum 'Butterfly' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist, more often in pots and heat | Pet-safe |
| Acer rubrum | Direct sun (at least 4-6 hours) | Deep soak weekly for the first two seasons; established trees rely on rainfall | Mildly toxic to pets |
| Acer rubrum 'Autumn Blaze' | Direct sun (at least 4-6 hours) | Weekly while establishing; deep watering in droughts thereafter | Pet-safe |
| Acer rubrum 'October Glory' | Direct sun (at least 4-6 hours) | Weekly while establishing; deep watering in dry spells thereafter | Pet-safe |
| Acerola | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days in growth | Mildly toxic to pets |
| Achachairu | Bright indirect light (just back from a sunny window) | Water abundantly and consistently year-round; do not allow to dry out. | Mildly toxic to pets |
| Achillea 'Terracotta' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry; roughly every 7-10 days while establishing, rarely once mature | Toxic to pets |
| Achillea millefolium 'Cerise Queen' | Direct sun (at least 4-6 hours) | When the top few centimeters of soil are dry, about every 7-14 days | Mildly toxic to pets |
| Achillea ptarmica 'The Pearl' | Direct sun (at least 4-6 hours) | When the top few cm of soil dry out; roughly weekly, more in heat | Toxic to pets |
| Adagio Maiden Grass | Direct sun (at least 4-6 hours) | Weekly in the first year, then mostly rainfall except in drought | Mildly toxic to pets |
| Adagio Maiden Grass | Direct sun (at least 4-6 hours) | Weekly for the first season; every 2–3 weeks once established | Pet-safe |
| Adriatic Bellflower | Bright indirect light (just back from a sunny window) | Weekly during spring and summer; minimal in winter | Pet-safe |
| Adromischus Cooperi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Cristatus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Adromischus Hemisphaericus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Adromischus Maculatus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Marianiae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Trigynus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Aechmea recurvata | Bright indirect light (just back from a sunny window) | Keep the small cup filled; refresh weekly and water mix when top few cm dry | Pet-safe |
| Aeonium Canariense | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| Aeonium Castello-Paivae 'Variegata' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| Aeonium Decorum | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| Aeonium Haworthii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| Aeonium Tabuliforme | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in active growth | Mildly toxic to pets |
| Aeonium Velour | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| Aerangis rhodosticta | Bright indirect light (just back from a sunny window) | Mounted plants every 1-2 days in summer, every 2-4 days in winter; potted plants when the surface bark just begins to dry | Pet-safe |
| Aesculus × carnea 'Briotii' | Direct sun (at least 4-6 hours) | Water young trees weekly to establish, then rely on rainfall | Toxic to pets |
| Aesculus flava | Direct sun (at least 4-6 hours) | Deep watering every 7-10 days through the first two or three growing seasons; established trees rarely need irrigation | Toxic to pets |
| Aesculus hippocastanum | Direct sun (at least 4-6 hours) | Water young trees weekly to establish, then rely on rainfall | Toxic to pets |
| Afghan Iris | Direct sun (at least 4-6 hours) | Moderate in late winter to late spring; bone dry from midsummer to early autumn | Toxic to pets |
| African Cornflag | Direct sun (at least 4-6 hours) | Weekly during the winter-spring growing season; none in summer dormancy | Mildly toxic to pets |
| African Crossandra | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season, reducing to every 10–14 days in winter | Pet-safe |
| African feather grass | Direct sun (at least 4-6 hours) | Every 1–2 weeks once established; more frequently when newly planted | Pet-safe |
| African Kedrostis | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; once a month or less in winter | Mildly toxic to pets |
| African Mangosteen | Direct sun (at least 4-6 hours) | Water when soil is almost fully dry; established trees tolerate drought. | Mildly toxic to pets |
| African marigold | Direct sun (at least 4-6 hours) | Once or twice weekly; allow top 2–3 cm of soil to dry between waterings | Mildly toxic to pets |
| African Milk Tree | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; roughly every 3-4 weeks in winter | Toxic to pets |
| African Star Apple | Bright indirect light (just back from a sunny window) | Every 5–7 days; maintain consistent moisture without waterlogging | Mildly toxic to pets |
| African Tamarisk | Direct sun (at least 4-6 hours) | Low once established; moderate during establishment | Pet-safe |
| African Violet 'Blue Nile' | Bright indirect light (just back from a sunny window) | When the top of the soil feels barely dry, roughly every 5-7 days | Pet-safe |
| African Yellowwood | Bright indirect light (just back from a sunny window) | When the top few cm of soil dry, roughly weekly while establishing | Toxic to pets |
| Afro Hard Rush | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water 1–2 times per week in warm weather | Pet-safe |
| Agastache 'Black Adder' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-14 days once established | Mildly toxic to pets |
| Agastache 'Blue Fortune' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Agastache 'Kudos Coral' | Direct sun (at least 4-6 hours) | Water deeply during the first season while establishing, then only in prolonged drought once mature | Mildly toxic to pets |
| Agave americana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave americana 'Marginata' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave americana 'Mediopicta Alba' | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave attenuata | Bright indirect light (just back from a sunny window) | When the top few centimetres of soil are dry, roughly every 1-2 weeks in summer | Mildly toxic to pets |
| Agave bovicornuta | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth, only when soil is fully dry | Mildly toxic to pets |
| Agave chrysantha | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth, only when soil is dry | Mildly toxic to pets |
| Agave colorata | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth, only when soil is fully dry | Mildly toxic to pets |
| Agave deserti | Direct sun (at least 4-6 hours) | Every 3-4 weeks in growth, only when soil is bone dry | Mildly toxic to pets |
| Agave difformis | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth when soil is dry, less in winter | Mildly toxic to pets |
| Agave filifera | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Mildly toxic to pets |
| Agave geminiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Mildly toxic to pets |
| Agave havardiana | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Agave isthmensis | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Agave lechuguilla | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and rarely in winter | Toxic to pets |
| Agave lophantha | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in summer and monthly or less in winter | Mildly toxic to pets |
| Agave macroacantha | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Agave marmorata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer and monthly in winter | Toxic to pets |
| Agave mitis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 2 weeks in summer and monthly in winter | Toxic to pets |
| Agave montana | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer; sparingly in winter | Mildly toxic to pets |
| Agave multifilifera | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Agave nickelsiae | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Agave nizandensis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Mildly toxic to pets |
| Agave ovatifolia | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and rarely in winter | Mildly toxic to pets |
| Agave palmeri | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 2-3 weeks in the growing season, sparingly in winter | Mildly toxic to pets |
| Agave parrasana | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 2-3 weeks in summer, monthly or less in winter | Mildly toxic to pets |
| Agave parryi | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave parryi 'Truncata' | Direct sun (at least 4-6 hours) | When fully dry, every 2-3 weeks in summer; monthly or less in winter | Toxic to pets |
| Agave parryi var. truncata | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave pelona | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 2-3 weeks in summer, very sparingly in winter | Mildly toxic to pets |
| Agave potatorum | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and sparingly in winter | Mildly toxic to pets |
| Agave schidigera | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 2-3 weeks in summer, monthly or less in winter | Mildly toxic to pets |
| Agave shrevei | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 2-3 weeks in summer, sparingly in winter | Mildly toxic to pets |
| Agave sobria | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 2-3 weeks in summer, sparingly in winter | Mildly toxic to pets |
| Agave striata | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 2-3 weeks in summer, monthly or less in winter | Mildly toxic to pets |
| Agave stricta | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and rarely in winter | Mildly toxic to pets |
| Agave titanota | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and rarely in winter | Mildly toxic to pets |
| Agave toumeyana | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; monthly or less in winter | Toxic to pets |
| Agave utahensis | Direct sun (at least 4-6 hours) | When fully dry, every 2-4 weeks in summer; little to none in winter | Toxic to pets |
| Agave victoriae-reginae | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave victoriae-reginae 'Compacta' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Mildly toxic to pets |
| Agave xylonacantha | Direct sun (at least 4-6 hours) | When fully dry, every 2-3 weeks in summer; monthly or less in winter | Toxic to pets |
| Agave zebra | Direct sun (at least 4-6 hours) | When fully dry, every 2-4 weeks in summer; little to none in winter | Toxic to pets |
| Agave-Leaved Sea Holly | Direct sun (at least 4-6 hours) | Low — occasional deep watering during the first season, minimal thereafter | Pet-safe |
| Ageratum houstonianum 'Artist Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days | Toxic to pets |
| Ageratum houstonianum 'Blue Horizon' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days | Toxic to pets |
| Aglaonema Golden Bay | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Harlequin | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Legacy | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Maria | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Modestum | Low light (north window or shaded room) | When top 3-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Aglaonema Osaka | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Pink Dalmatian | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Prosperity | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Silver Bay | Low light (north window or shaded room) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Aglaonema Silver Queen | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Super White | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Tigress | Low light (north window or shaded room) | When top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Wishes | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Agnes Rose | Direct sun (at least 4-6 hours) | Deep watering once a week, more in drought or first season | Pet-safe |
| Aizoon Rosularia | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in spring and summer; rarely in winter | Pet-safe |
| Akebia quinata | Bright indirect light (just back from a sunny window) | When the top 4-5 cm of soil dries, about every 7-10 days while establishing | Mildly toxic to pets |
| Alabama Lip Fern | Medium indirect light (a couple of metres from a window) | every 2-3 weeks | Mildly toxic to pets |
| Alan Fradd Rock Rose | Direct sun (at least 4-6 hours) | Establish with deep, infrequent waterings in the first season; drought-tolerant once established and needs no irrigation in typical UK summers. | Mildly toxic to pets |
| Albany Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks (allow full dry-down between waterings) | Toxic to pets |
| Albert's Gold tree heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks in summer once established | Pet-safe |
| Albion Black Pod nigella | Direct sun (at least 4-6 hours) | Weekly or as needed | Mildly toxic to pets |
| Albizia julibrissin | Direct sun (at least 4-6 hours) | Water weekly during establishment, then only in extended drought | Mildly toxic to pets |
| Albizia julibrissin 'Rosea' | Direct sun (at least 4-6 hours) | Water weekly while establishing, then only in prolonged drought | Mildly toxic to pets |
| Alcantarea imperialis | Bright indirect light (just back from a sunny window) | Keep the central tank filled; water the mix when its top 4-5 cm is dry | Pet-safe |
| Alcantarea odorata | Bright indirect light (just back from a sunny window) | Keep the central tank filled; water the mix when its top 4-5 cm is dry | Pet-safe |
| Alchemilla mollis | Bright indirect light (just back from a sunny window) | Water in dry spells; established plants are drought-tolerant and need watering only occasionally | Mildly toxic to pets |
| Alerce | Bright indirect light (just back from a sunny window) | Keep consistently moist at all times; water deeply during any dry period and never allow drought | Mildly toxic to pets |
| Algerian Fir | Direct sun (at least 4-6 hours) | Low to moderate; highly drought-tolerant once established | Pet-safe |
| all gold Japanese forest grass | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water 1-2 times weekly, more in dry or warm spells | Mildly toxic to pets |
| Allegheny Spurge | Low light (north window or shaded room) | Weekly during the first 1–2 growing seasons; every 2–3 weeks once established | Mildly toxic to pets |
| Allium 'Gladiator' | Direct sun (at least 4-6 hours) | Water during spring growth; keep dry in summer dormancy, every 2-3 weeks at most if drought-stressed | Toxic to pets |
| Allium 'Globemaster' | Direct sun (at least 4-6 hours) | Water during spring growth; keep dry through summer dormancy, every 2-3 weeks at most if drought-stressed | Toxic to pets |
| Allium 'Hair' | Direct sun (at least 4-6 hours) | Water at planting then only in prolonged spring drought; keep dry once dormant | Toxic to pets |
| Allium 'Mount Everest' | Direct sun (at least 4-6 hours) | Water in spring growth; keep dry over summer dormancy, every 2-3 weeks at most if very dry | Toxic to pets |
| Allium 'Purple Sensation' | Direct sun (at least 4-6 hours) | Water during active spring growth only; otherwise minimal, every 2-3 weeks if dry | Toxic to pets |
| Alocasia 'Pink Dragon' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 inch) of soil dries out — roughly every 5-7 days in summer, every 10-14 days in winter | Toxic to pets |
| Alocasia Bambino | Bright indirect light (just back from a sunny window) | Every 5-10 days in the growing season; less in winter | Toxic to pets |
| Alocasia Cuprea Red Secret | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Alocasia Frydek (Green Velvet) | Bright indirect light (just back from a sunny window) | When the top third of the soil dries; roughly weekly in summer, fortnightly in winter | Toxic to pets |
| Alocasia Ivory Coast | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days in growth | Toxic to pets |
| Alocasia Longiloba | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia Odora | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 4-7 days in growth | Toxic to pets |
| Alocasia Polly | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 5-7 days in summer and every 10-14 days in winter | Toxic to pets |
| Alocasia Portora | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 4-7 days in growth | Toxic to pets |
| Alocasia Sanderiana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Toxic to pets |
| Alocasia Stingray | Bright indirect light (just back from a sunny window) | Roughly every 5-9 days in spring and summer; reduce to about every 2-3 weeks in winter. | Toxic to pets |
| Alocasia Triangularis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia Zebrina | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 7-10 days in growth | Toxic to pets |
| Aloe 'Blue Elf' | Direct sun (at least 4-6 hours) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe 'Delta Lights' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe 'Firebird' | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe 'Hercules' | Direct sun (at least 4-6 hours) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe 'Pink Blush' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Aculeata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Burgersfortensis | Direct sun (at least 4-6 hours) | When the mix has dried out, roughly every 2 weeks in summer | Toxic to pets |
| Aloe Castillon | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in warm growth | Toxic to pets |
| Aloe Comosa | Direct sun (at least 4-6 hours) | Only when bone dry, roughly every 3 weeks in active growth | Toxic to pets |
| Aloe Dorotheae | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in growth | Toxic to pets |
| Aloe Erinacea | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 2-3 weeks at most in growth | Toxic to pets |
| Aloe Ferox | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Gariepensis | Direct sun (at least 4-6 hours) | Only when completely dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Globuligemma | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer | Toxic to pets |
| Aloe Greatheadii | Direct sun (at least 4-6 hours) | When the mix is dry, roughly every 2 weeks in summer | Toxic to pets |
| Aloe Hereroensis | Direct sun (at least 4-6 hours) | When the soil is bone-dry throughout, roughly every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Aloe Humilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Aloe Krapohliana | Direct sun (at least 4-6 hours) | Sparingly when soil is fully dry — roughly every 2-3 weeks in active growth, very little in summer dormancy | Toxic to pets |
| Aloe Microstigma | Direct sun (at least 4-6 hours) | When soil is fully dry, about weekly in peak summer heat | Toxic to pets |
| Aloe Minima | Direct sun (at least 4-6 hours) | When soil is dry, roughly every 2 weeks in growth | Toxic to pets |
| Aloe Mitis | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer | Toxic to pets |
| Aloe Peglerae | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Petricola | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer | Toxic to pets |
| Aloe Pluridens | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 1-2 weeks in summer for an established plant | Toxic to pets |
| Aloe Rauhii | Bright indirect light (just back from a sunny window) | When soil is dry, roughly every 2 weeks in growth | Toxic to pets |
| Aloe Reitzii | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and once a month or less in winter | Toxic to pets |
| Aloe Rubroviolacea | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Aloe Secundiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer and once a month in winter | Toxic to pets |
| Aloe Speciosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Aloe Suzannae | Direct sun (at least 4-6 hours) | When the soil is dry, roughly every 2 weeks in warm growth and monthly in cool weather | Toxic to pets |
| Aloe Thraskii | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in summer and monthly in winter | Toxic to pets |
| Aloe Tomentosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Aloe Vanbalenii | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in summer and monthly in winter | Toxic to pets |
| Aloe vera | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| Aloe Vera 'Chinese' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of mix is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Aloe Wickensii | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 2-3 weeks in the growing season | Toxic to pets |
| Alpine Aster | Direct sun (at least 4-6 hours) | Once per week in dry spells; rainfall usually sufficient when established | Mildly toxic to pets |
| Alpine Azalea | Bright indirect light (just back from a sunny window) | Regular; keep soil moist | Mildly toxic to pets |
| Alpine Balsam | Direct sun (at least 4-6 hours) | Every 7–14 days during growth; reduce after setting seed | Mildly toxic to pets |
| Alpine Campion | Bright indirect light (just back from a sunny window) | Low to moderate — water during dry spells; ensure good drainage | Mildly toxic to pets |
| Alpine Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Alpine Liverwort | Bright indirect light (just back from a sunny window) | Low to moderate — water when the top centimetre of soil dries | Mildly toxic to pets |
| Alpine Pink | Direct sun (at least 4-6 hours) | Low to moderate; water when the top 2 cm of soil are dry | Mildly toxic to pets |
| Alpine Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Alpine Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks when in growth (spring–summer); very sparingly in winter | Pet-safe |
| Alpine Sea Holly | Direct sun (at least 4-6 hours) | Water during establishment and in extended dry spells; otherwise infrequently | Mildly toxic to pets |
| Alpine Toadflax | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; minimal in winter. | Mildly toxic to pets |
| Alpine Totara | Direct sun (at least 4-6 hours) | When the top few cm of soil dry out, roughly weekly while establishing | Toxic to pets |
| Altissimo Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the first season; established plants when the top 5 cm of soil is dry | Pet-safe |
| Amalia's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Daily to every other day; medium must stay damp but not sodden | Pet-safe |
| Amazon Mist Sedge | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply once or twice weekly in heat, less in cool weather | Mildly toxic to pets |
| Ambarella | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant when established | Pet-safe |
| Amelanchier × grandiflora 'Robin Hill' | Direct sun (at least 4-6 hours) | Weekly deep watering through the first two seasons; established trees need water only in prolonged drought | Mildly toxic to pets |
| Amelanchier canadensis | Direct sun (at least 4-6 hours) | Weekly while establishing; prefers consistently moist soil | Mildly toxic to pets |
| America Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while establishing; mature plants when the top few centimetres of soil dry out | Pet-safe |
| American Basswood | Bright indirect light (just back from a sunny window) | Weekly during establishment; less once mature | Pet-safe |
| American Beachgrass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| American Dunegrass | Direct sun (at least 4-6 hours) | Low; drought-tolerant | Pet-safe |
| American Holly | Bright indirect light (just back from a sunny window) | Weekly while establishing, then during dry spells | Toxic to pets |
| American Lady Fern | Low light (north window or shaded room) | Every 2–3 days during active growth; less frequently in winter | Pet-safe |
| American Wall Fern | Medium indirect light (a couple of metres from a window) | Every 7–10 days when in growth; every 2–3 weeks in winter | Pet-safe |
| American wisteria | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once mature | Toxic to pets |
| Amethyst Sea Holly | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Mildly toxic to pets |
| Anaga Monanthes | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in winter | Mildly toxic to pets |
| Ananas bracteatus | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, about every 7-10 days in growth, less in winter | Pet-safe |
| Ananas comosus 'Variegatus' | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, about every 7-10 days in growth, less in winter | Pet-safe |
| Ancistrachne uncinulella | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in growth | Mildly toxic to pets |
| Andean Silver-Leaf Sage | Direct sun (at least 4-6 hours) | Allow soil to dry 2–3 cm between waterings | Mildly toxic to pets |
| Anderson's Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Anderson's Holly Fern | Medium indirect light (a couple of metres from a window) | Twice weekly in the growing season, weekly in winter | Pet-safe |
| Andorra Compact Juniper | Direct sun (at least 4-6 hours) | Every 7-10 days in the first season, then sparingly | Mildly toxic to pets |
| Anemone × hybrida 'Honorine Jobert' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply weekly in dry spells, more in its first year | Toxic to pets |
| Anemone × hybrida 'Königin Charlotte' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply once a week in dry weather, more while establishing | Toxic to pets |
| Anemone × hybrida 'Pamina' | Bright indirect light (just back from a sunny window) | Keep evenly moist; deep weekly watering in dry weather, more while establishing | Toxic to pets |
| Anemone hupehensis 'Hadspen Abundance' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply weekly in dry spells and more during establishment | Toxic to pets |
| Angel Frost Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in spring and autumn | Pet-safe |
| Angel's Tears Daffodil | Direct sun (at least 4-6 hours) | Low; water during active growth, dry summer dormancy | Toxic to pets |
| Angel's Trumpet Hybrid | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (keep consistently moist) | Toxic to pets |
| Angelina Stonecrop | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in summer; little to none in winter | Pet-safe |
| Angelonia angustifolia 'Archangel White' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Angraecum distichum | Bright indirect light (just back from a sunny window) | Keep evenly moist; water roughly every 2-4 days when mounted, or when the bark surface just begins to dry | Pet-safe |
| Angraecum eburneum | Direct sun (at least 4-6 hours) | When the substrate is almost completely dry, roughly every 5-7 days year-round | Mildly toxic to pets |
| Anguloa clowesii | Bright indirect light (just back from a sunny window) | Every 5-7 days in active summer growth; taper to roughly every 2-3 weeks once leaves yellow and drop | Mildly toxic to pets |
| Annual baby's breath | Direct sun (at least 4-6 hours) | Once weekly; allow the soil to dry slightly between waterings | Mildly toxic to pets |
| Annual Phlox | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil evenly moist but not saturated | Pet-safe |
| Anthurium arisaemoides | Bright indirect light (just back from a sunny window) | When the top 2 cm of mix begins to dry, about every 4-7 days | Toxic to pets |
| Anthurium brownii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-8 days | Toxic to pets |
| Anthurium clarinervium (Velvet Cardboard Anthurium) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 5-7 days in summer and every 10-14 days in winter | Toxic to pets |
| Anthurium clidemioides | Bright indirect light (just back from a sunny window) | When the surface substrate begins to dry, about every 3-6 days | Toxic to pets |
| Anthurium corrugatum | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of mix dries, about every 5-9 days | Toxic to pets |
| Anthurium Timbuiquense | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix begins to dry, often every 5-7 days | Toxic to pets |
| Anthurium Warocqueanum × Andreanum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is just dry, roughly every 5-8 days | Toxic to pets |
| Anthurium x 'Ace of Spades' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Anthurium x 'Vittarifolium Hybrid' | Bright indirect light (just back from a sunny window) | When the surface of the mix begins to dry, roughly every 4-6 days | Toxic to pets |
| Antigonon leptopus | Direct sun (at least 4-6 hours) | Water regularly while establishing, then only in prolonged drought | Mildly toxic to pets |
| Antimima dualis | Direct sun (at least 4-6 hours) | Thorough but infrequent autumn-spring; little or none in summer | Mildly toxic to pets |
| Antirrhinum majus 'Rocket Red' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Antirrhinum majus 'Sonnet Pink' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Antirrhinum majus 'Twinny Peach' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Apache beggarticks | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 7–10 days in-ground once established | Mildly toxic to pets |
| Appalachian Barren Strawberry | Medium indirect light (a couple of metres from a window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Appalachian Blazing Star | Direct sun (at least 4-6 hours) | Every 2 weeks during establishment; essentially rain-fed once mature | Pet-safe |
| Apple Blossom flowering quince | Bright indirect light (just back from a sunny window) | Weekly when establishing; rainfall sufficient for established plants in temperate climates | Mildly toxic to pets |
| Aptos Blue Redwood | Direct sun (at least 4-6 hours) | Weekly when young; every 1–2 weeks when established | Pet-safe |
| Aquilegia 'Black Barlow' | Medium indirect light (a couple of metres from a window) | Water when the top 3 cm of soil dries, roughly weekly | Mildly toxic to pets |
| Aquilegia 'Nora Barlow' | Medium indirect light (a couple of metres from a window) | Water when the top 3 cm of soil dries, about weekly | Mildly toxic to pets |
| Arabian Desert Rose | Direct sun (at least 4-6 hours) | Every 7–14 days in active growth (spring–summer); minimal in winter dormancy | Toxic to pets |
| Araza | Bright indirect light (just back from a sunny window) | Twice per week; water when the top 2–3 cm of soil is dry | Mildly toxic to pets |
| Arborvitae | Direct sun (at least 4-6 hours) | Deeply once or twice a week for the first 1-2 growing seasons, then mainly in droughts | Toxic to pets |
| Ardisia Crenata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Ardisia Elliptica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Arendsii astilbe | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer; weekly otherwise | Pet-safe |
| Arid Mountain Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (autumn–spring); none in summer | Toxic to pets |
| Arizona Chalk Dudleya | Direct sun (at least 4-6 hours) | Every 3–4 weeks in winter and early spring; completely dry in summer dormancy | Mildly toxic to pets |
| Arizona Cypress | Direct sun (at least 4-6 hours) | Every 1-2 weeks while establishing, then rarely | Mildly toxic to pets |
| Arizona Cypress 'Blue Ice' | Direct sun (at least 4-6 hours) | Every 1-2 weeks while establishing, then rarely | Mildly toxic to pets |
| Arkansas Beardtongue | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Armenian Speedwell | Direct sun (at least 4-6 hours) | Every 10–14 days during the growing season; little to none in winter. | Pet-safe |
| Aroanian Germander | Direct sun (at least 4-6 hours) | Minimal — once every 3 weeks in summer; dry in winter | Mildly toxic to pets |
| Aromatic Aster | Direct sun (at least 4-6 hours) | Water to establish, then rarely; very drought-tolerant | Pet-safe |
| Arrowwood Viburnum | Direct sun (at least 4-6 hours) | Weekly when young; established plants tolerate both moist and occasionally dry soil | Pet-safe |
| Arum Lily | Bright indirect light (just back from a sunny window) | Regularly moist to wet — water every 2–3 days or plant in standing water | Toxic to pets |
| Ashy Broom | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Toxic to pets |
| Ashy Sunflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very drought-tolerant | Pet-safe |
| Asparagus Fern 'Sprengeri' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Asplenium platyneuron | Low light (north window or shaded room) | Water when the top 2-3 cm is dry; tolerates short dry spells better than most ferns | Pet-safe |
| Assam Fan Palm | Direct sun (at least 4-6 hours) | Weekly in growing season, every 2–3 weeks in winter | Pet-safe |
| Aster × frikartii 'Mönch' | Direct sun (at least 4-6 hours) | Water to establish, then moderately; water in prolonged dry spells | Pet-safe |
| Astilbe 'Bridal Veil' | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply 1-2 times weekly, more in heat | Mildly toxic to pets |
| Astilbe 'Fanal' | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days in summer, never letting it dry out | Mildly toxic to pets |
| Astilbe simplicifolia 'Sprite' | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply 1-2 times weekly, more in heat | Mildly toxic to pets |
| Astroloba Bullulata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth; monthly or less in winter | Mildly toxic to pets |
| Astroloba Congesta | Bright indirect light (just back from a sunny window) | When soil is completely dry, about every 2-3 weeks in growth and monthly or less in winter | Mildly toxic to pets |
| Astroloba Corrugata | Bright indirect light (just back from a sunny window) | When the soil has dried out completely — roughly every 2-3 weeks in growth, monthly or less in winter | Mildly toxic to pets |
| Astroloba Foliolosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry — roughly every 2-3 weeks in growth, monthly or less in winter | Mildly toxic to pets |
| Astroloba Spiralis | Bright indirect light (just back from a sunny window) | When the soil is completely dry — roughly every 2-3 weeks in growth, monthly or less in winter | Mildly toxic to pets |
| Athyrium filix-femina 'Frizelliae' | Low light (north window or shaded room) | Keep evenly moist; water every 4-6 days, more in hot weather | Mildly toxic to pets |
| Athyrium filix-femina 'Minutissimum' | Low light (north window or shaded room) | Keep consistently moist; water every 4-6 days, more in heat | Mildly toxic to pets |
| Athyrium niponicum 'Red Beauty' | Low light (north window or shaded room) | Keep evenly moist; water every 4-6 days, more often in heat | Mildly toxic to pets |
| Athyrium niponicum 'Ursula's Red' | Low light (north window or shaded room) | Keep evenly moist; water every 4-6 days, increasing in hot weather | Mildly toxic to pets |
| Athyrium otophorum | Low light (north window or shaded room) | Keep evenly moist; water every 4-6 days, more in heat | Mildly toxic to pets |
| Atlantic Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; once monthly in winter | Mildly toxic to pets |
| Atlantic White Cedar | Direct sun (at least 4-6 hours) | Constant moisture; tolerates standing water seasonally | Mildly toxic to pets |
| Atlantic Wild Indigo | Direct sun (at least 4-6 hours) | Low once established; water weekly in the first season | Toxic to pets |
| Atlas Cedar | Direct sun (at least 4-6 hours) | Weekly during establishment; very drought-tolerant once established | Mildly toxic to pets |
| Aucuba japonica Crotonifolia | Low light (north window or shaded room) | Water to establish, then every 7-14 days in dry spells; less in cool months | Mildly toxic to pets |
| Aucuba japonica Picturata | Low light (north window or shaded room) | When the top 3-5 cm of soil is dry, about weekly while establishing then less often | Mildly toxic to pets |
| Aucuba japonica Rozannie | Low light (north window or shaded room) | When the top 3-5 cm of soil is dry, roughly weekly in the first year then far less once established | Mildly toxic to pets |
| Audray White globe amaranth | Direct sun (at least 4-6 hours) | Every 5–7 days; drought-tolerant once established | Pet-safe |
| Audrey Fig | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Australian Bangalow Palm | Direct sun (at least 4-6 hours) | Weekly during establishment; every 10–14 days once established in-ground | Pet-safe |
| Australian Cabbage Palm | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer, fortnightly in winter | Mildly toxic to pets |
| Australian Cycad | Bright indirect light (just back from a sunny window) | Every 14–21 days in summer; very sparingly in winter | Toxic to pets |
| Australian Fan Palm | Bright indirect light (just back from a sunny window) | Weekly in the growing season; every 10–14 days in winter | Pet-safe |
| Australian Foxtail Cycad | Direct sun (at least 4-6 hours) | When the top 5 cm of mix is dry, roughly every 12-16 days in growth | Toxic to pets |
| Autumn Brilliance serviceberry | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once established | Pet-safe |
| Autumn Catchfly | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; reduce in winter | Pet-safe |
| Autumn Fern 'Brilliance' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Autumn heath | Direct sun (at least 4-6 hours) | Fortnightly during establishment; drought-tolerant once established | Pet-safe |
| Autumn Joy Stonecrop | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought — roughly every 10-14 days if newly planted | Mildly toxic to pets |
| Autumn Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and early summer; taper to every 2–3 weeks in late summer | Pet-safe |
| Autumn Moor Grass | Direct sun (at least 4-6 hours) | Weekly during the first season; established plants only in prolonged drought | Mildly toxic to pets |
| autumn red grass | Direct sun (at least 4-6 hours) | Every 7–14 days during the growing season; reduce in autumn and winter | Pet-safe |
| Autumn Sage | Direct sun (at least 4-6 hours) | Occasional once established; regular for first season | Pet-safe |
| Ayabaca Masdevallia | Medium indirect light (a couple of metres from a window) | Every 2–3 days; keep medium consistently moist | Pet-safe |
| Azores Jasmine | Direct sun (at least 4-6 hours) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Azure Grape Hyacinth | Direct sun (at least 4-6 hours) | Water during active growth; allow to dry out completely in summer | Mildly toxic to pets |
| Baboon Flower | Direct sun (at least 4-6 hours) | Regular during growth and flowering, dry during summer dormancy | Mildly toxic to pets |
| Baby rubber plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-14 days in summer and every 2-3 weeks in winter | Pet-safe |
| Baby Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Baby's breath | Direct sun (at least 4-6 hours) | Every 10–14 days when established; weekly when young | Mildly toxic to pets |
| Baby's Tears | Bright indirect light (just back from a sunny window) | Every 2-4 days; keep soil consistently moist | Pet-safe |
| Bachelor's button | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Bacopa | Bright indirect light (just back from a sunny window) | Every 2–3 days in containers during warm weather; reduce in cooler conditions | Pet-safe |
| Bahia Earth Star | Bright indirect light (just back from a sunny window) | Water soil when top 2-3 cm is dry, roughly every 7-14 days | Pet-safe |
| Bahian Neoregelia | Direct sun (at least 4-6 hours) | Water sparingly; allow potting medium to dry between waterings and keep a small amount of water in the central cup | Pet-safe |
| Baines' Cyphostemma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Toxic to pets |
| Balearic box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Balkan Pink | Direct sun (at least 4-6 hours) | Low; water sparingly, allowing soil to dry fully between waterings | Mildly toxic to pets |
| Balkan Rock Pink | Direct sun (at least 4-6 hours) | Very infrequent; drought-tolerant | Mildly toxic to pets |
| Balkan Saxifrage | Direct sun (at least 4-6 hours) | Low — water at the base only; allow near-drying between waterings | Pet-safe |
| Balsam Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; naturally rainfall-sustained thereafter | Pet-safe |
| Balsam Gourd | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; monthly or less in winter | Mildly toxic to pets |
| Bamboo Muhly | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter once established | Pet-safe |
| Bamboo Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days (keep soil evenly moist but never waterlogged) | Pet-safe |
| bamburanta | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Banana passionflower | Bright indirect light (just back from a sunny window) | Weekly in growing season, reduce in winter | Mildly toxic to pets |
| Banded Cape Primrose | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; reduce to every 10-14 days in winter | Pet-safe |
| Banded Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in summer, sparse in winter | Pet-safe |
| Baptisia 'Purple Smoke' | Direct sun (at least 4-6 hours) | Weekly the first season; minimal once established | Toxic to pets |
| Barbados Maidenhair Fern | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep consistently moist | Pet-safe |
| Barbara Karst Bougainvillea | Direct sun (at least 4-6 hours) | Deeply every 7–10 days when established; more often for container plants | Mildly toxic to pets |
| Barla's Masdevallia | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; roots should never dry out completely | Pet-safe |
| Baron's Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; none from late autumn to mid-spring | Toxic to pets |
| Barrelier's Sage | Direct sun (at least 4-6 hours) | Weekly to establish, then fortnightly | Pet-safe |
| Barren Strawberry | Medium indirect light (a couple of metres from a window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Barter's Cycad | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 4–6 weeks in winter | Toxic to pets |
| Basil-Leaved Sun Rose | Direct sun (at least 4-6 hours) | Very low — minimal supplemental irrigation needed once established | Mildly toxic to pets |
| Basket Bromeliad | Medium indirect light (a couple of metres from a window) | Tank every 5–7 days; soil every 10–14 days | Pet-safe |
| Basket Plant | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of soil is dry, about every 7-12 days | Toxic to pets |
| Basketgrass | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Bastard Cobas | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once every 4–6 weeks or less in winter | Toxic to pets |
| Batalin's Tulip | Direct sun (at least 4-6 hours) | Light to moderate in spring; completely dry in summer | Toxic to pets |
| Beach Cabbage | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Mildly toxic to pets |
| Beacon Silver Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–10 days; water more frequently in sunny or dry situations | Pet-safe |
| Beaked Homalomena | Low light (north window or shaded room) | Every 7–14 days; reduce in winter | Toxic to pets |
| Bear Paw | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; roughly every 2-3 weeks in winter | Toxic to pets |
| Bearberry Cotoneaster | Direct sun (at least 4-6 hours) | Fortnightly once established; more frequent for the first growing season | Mildly toxic to pets |
| Bearded-Stem Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to partially dry between waterings) | Pet-safe |
| Beatrice Watsonia | Direct sun (at least 4-6 hours) | Regular throughout growing season; reduce but do not dry out in winter | Mildly toxic to pets |
| Beaucarnea Gracilis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Pet-safe |
| Beaucarnea Stricta | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and much less in winter | Pet-safe |
| beautiful feather grass | Direct sun (at least 4-6 hours) | Weekly in the first season; minimal once established | Pet-safe |
| Beautiful Graptopetalum | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; monthly or less in winter | Pet-safe |
| Beautiful Sea Holly | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Mildly toxic to pets |
| Beautiful-net Lepanthes | Medium indirect light (a couple of metres from a window) | Daily to every 2 days; never allow roots to dry out completely | Pet-safe |
| Beavertail Cactus | Direct sun (at least 4-6 hours) | Very sparingly when soil is bone dry, roughly every 3-4 weeks in summer; keep dry in winter | Pet-safe |
| Becky Shasta daisy | Direct sun (at least 4-6 hours) | Every 5–7 days in the growing season; less in cool or wet weather | Mildly toxic to pets |
| Bee Orchid | Bright indirect light (just back from a sunny window) | Low; drought-tolerant once established | Pet-safe |
| Beefsteak Begonia | Bright indirect light (just back from a sunny window) | Roughly weekly in summer; every 10-14 days in winter | Toxic to pets |
| Begonia 'Dragon Wing Pink' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Begonia 'Dragon Wing Red' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer containers | Toxic to pets |
| Begonia 'Gryphon' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Begonia 'Nonstop Joy White' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia 'Nonstop Red' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia 'Nonstop Rose Petticoat' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia 'Picotee Lace Pink' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia 'Pin Up Flame' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia 'Sophie' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Begonia × tuberhybrida 'Nonstop Rose' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is just dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia × tuberhybrida 'Pin-Up Flame' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is just dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia dregei | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Begonia grandis subsp. evansiana | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist in summer; water during dry spells, roughly weekly in heat | Toxic to pets |
| Begonia manicata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Begonia partita | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-12 days | Toxic to pets |
| Bell Cotyledon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 5–6 weeks in winter | Toxic to pets |
| Bell heather | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2–3 weeks once established | Pet-safe |
| Bell Heather C.D. Eason | Direct sun (at least 4-6 hours) | Moderate; water during dry spells, avoid waterlogging | Mildly toxic to pets |
| Bellina Moth Orchid | Bright indirect light (just back from a sunny window) | Roughly every 5-7 days; when potting media is nearly dry but not bone dry | Pet-safe |
| Bent Alligator Flag | Direct sun (at least 4-6 hours) | Permanent standing water or saturated soil; up to 30 cm over roots | Mildly toxic to pets |
| Bent Masdevallia | Bright indirect light (just back from a sunny window) | Every 2-3 days in warm weather, every 3-4 days in winter | Pet-safe |
| Bent Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist through spring; tolerates slightly drier conditions during summer dormancy | Mildly toxic to pets |
| Beoley Gold heather | Direct sun (at least 4-6 hours) | Weekly during establishment; occasional watering once established in dry spells | Pet-safe |
| Berlandier's Jatropha | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Toxic to pets |
| Berry Smoothie Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Bertolonia maculata | Bright indirect light (just back from a sunny window) | Keep the mix evenly moist, watering when the top layer just starts to dry, roughly every 4-6 days | Pet-safe |
| Besleria lutea | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Besom heath | Direct sun (at least 4-6 hours) | Weekly during establishment; largely self-sufficient once established | Pet-safe |
| Betel Leaf | Medium indirect light (a couple of metres from a window) | When the top 2–3 cm of soil are dry, typically every 4–6 days indoors | Mildly toxic to pets |
| Bethencourt's Aichryson | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season (spring and autumn); sparingly in summer heat and winter rest | Mildly toxic to pets |
| Betula nigra | Direct sun (at least 4-6 hours) | Keep consistently moist; tolerates wet soil | Mildly toxic to pets |
| Betula pendula | Direct sun (at least 4-6 hours) | Weekly while establishing; water in drought | Mildly toxic to pets |
| Betula pendula 'Youngii' | Direct sun (at least 4-6 hours) | Weekly while young; deep-water in dry spells | Mildly toxic to pets |
| Betula utilis var. jacquemontii | Direct sun (at least 4-6 hours) | Weekly while young; water deeply in dry summers | Mildly toxic to pets |
| Beuvron Dwarf Scots Pine | Direct sun (at least 4-6 hours) | Every 10–14 days in summer during the first 3 years; largely self-sufficient once established | Toxic to pets |
| Bicalcarata Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep the medium consistently moist; water every 2-3 days, more in heat | Mildly toxic to pets |
| Bicolor Barrenwort | Low light (north window or shaded room) | Regularly in the first season; once established, once every 2–3 weeks or rely on rainfall | Mildly toxic to pets |
| Bidens ferulifolia 'Bidy Gonzales' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in containers during summer heat | Pet-safe |
| Bidens ferulifolia 'Campfire Fireburst' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in summer containers | Pet-safe |
| Big Bluestem | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; rainfall-sufficient once established in most of its native range | Pet-safe |
| Big-Flowered Catmint | Direct sun (at least 4-6 hours) | Every 7–10 days; allow soil surface to dry between waterings | Pet-safe |
| Bigcone Douglas Fir | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established | Pet-safe |
| Bigleaf Hydrangea 'Nikko Blue' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, often every 2-4 days in summer | Toxic to pets |
| Bigleaf Magnolia | Bright indirect light (just back from a sunny window) | Deeply twice weekly during establishment; weekly once established in dry periods | Pet-safe |
| Bignay | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 4-7 days in growth | Mildly toxic to pets |
| Bilimbi | Direct sun (at least 4-6 hours) | Every 3-7 days, keeping soil consistently moist; bilimbi dislikes drying out | Toxic to pets |
| Billbergia 'Fantasia' | Bright indirect light (just back from a sunny window) | Keep the central vase topped up; flush and refill every 1-2 weeks, water the mix when it dries | Pet-safe |
| Billy buttons | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Mildly toxic to pets |
| Birchleaf Spirea | Direct sun (at least 4-6 hours) | Weekly until established; occasional watering in drought once mature | Pet-safe |
| Bird's Foot Fern | Bright indirect light (just back from a sunny window) | every 2-4 weeks (very drought-tolerant once established) | Mildly toxic to pets |
| Bird's Nest Bromeliad | Low light (north window or shaded room) | Refill central cup weekly; substrate every 10–14 days | Pet-safe |
| Bird's Nest Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing; deep watering when the top 5 cm of soil is dry | Pet-safe |
| Bird's-nest Orchid | Low light (north window or shaded room) | Not applicable for cultivation; in nature, reliant on consistently moist woodland humus | Mildly toxic to pets |
| Birdcatcher Parlour Palm | Low light (north window or shaded room) | Every 10–14 days in summer, every 2–3 weeks in winter | Pet-safe |
| Biriba | Direct sun (at least 4-6 hours) | 2–3 times per week; do not allow soil to dry out | Pet-safe |
| Birthwort Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep medium consistently moist; water every 2–3 days | Mildly toxic to pets |
| Bishop Heliconia | Bright indirect light (just back from a sunny window) | Every 2–3 days in summer, weekly in winter | Mildly toxic to pets |
| Bishop's flower | Direct sun (at least 4-6 hours) | Every 5–7 days; less once established | Mildly toxic to pets |
| Bismarck Palm | Direct sun (at least 4-6 hours) | Regular while young; deep and infrequent once established | Mildly toxic to pets |
| Bisset's Bamboo | Direct sun (at least 4-6 hours) | Weekly during the growing season; every 2–3 weeks when dormant | Pet-safe |
| Bitter Vetch | Medium indirect light (a couple of metres from a window) | Moderate — allow soil to approach dryness between waterings | Mildly toxic to pets |
| Bitterroot | Direct sun (at least 4-6 hours) | Winter rains / early spring only; bone dry from June to October | Pet-safe |
| Black Ash | Direct sun (at least 4-6 hours) | High; requires consistently moist to wet soil | Pet-safe |
| Black Ball cornflower | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Black Bamboo | Direct sun (at least 4-6 hours) | Weekly when establishing; reduce once established | Pet-safe |
| Black Beauty Elderberry | Direct sun (at least 4-6 hours) | Weekly in the first two seasons; established plants tolerate short dry spells | Mildly toxic to pets |
| Black Calla Lily | Bright indirect light (just back from a sunny window) | Generously during active growth; taper off as foliage dies back; bone dry in dormancy | Toxic to pets |
| Black Cohosh | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer; weekly in cooler seasons | Mildly toxic to pets |
| Black Fang Begonia | Medium indirect light (a couple of metres from a window) | Every 10–14 days; allow top 2–3 cm to dry | Toxic to pets |
| Black Knight scabiosa | Direct sun (at least 4-6 hours) | Once or twice weekly | Pet-safe |
| Black Medick | Direct sun (at least 4-6 hours) | Low to moderate | Pet-safe |
| Black Mondo Grass | Medium indirect light (a couple of metres from a window) | Once a week during the growing season; reduce in winter | Mildly toxic to pets |
| Black Oak | Direct sun (at least 4-6 hours) | Rainfall-dependent once established; moderate supplemental irrigation in year 1–2 | Mildly toxic to pets |
| Black Prince Echeveria | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Black Prince snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil consistently moist | Pet-safe |
| Black Scallop Bugle | Medium indirect light (a couple of metres from a window) | Once or twice weekly; reduce to once weekly when established | Mildly toxic to pets |
| Black Spruce | Direct sun (at least 4-6 hours) | Consistent moisture; tolerates waterlogging — does not dry out between waterings | Pet-safe |
| Black-Eyed Susan | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Mildly toxic to pets |
| Black-Headed Fountain Grass | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2 weeks once established | Pet-safe |
| Black-Seeded Melic | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water in dry spells, especially in lighter shade | Mildly toxic to pets |
| Black-stemmed Spleenwort | Medium indirect light (a couple of metres from a window) | When the top centimetre of substrate feels dry | Pet-safe |
| Blackhaw Viburnum | Direct sun (at least 4-6 hours) | Weekly while establishing; established plants need water only in extended drought | Pet-safe |
| Bladder Campion | Bright indirect light (just back from a sunny window) | Low; drought-tolerant | Mildly toxic to pets |
| Bladder Cherry | Direct sun (at least 4-6 hours) | Weekly in the first season; established plants tolerate moderate drought | Toxic to pets |
| Bladder Cyphostemma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; withhold almost completely in winter dormancy | Mildly toxic to pets |
| Blanc Double de Coubert Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Blanket flower | Direct sun (at least 4-6 hours) | Every 7–14 days once established; water young plants more frequently | Pet-safe |
| Blanket Flower | Direct sun (at least 4-6 hours) | Water to establish, then sparingly; drought-tolerant | Mildly toxic to pets |
| Blochman's Liveforever | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (October–April); virtually none in summer | Pet-safe |
| Blonde Ambition Blue Grama | Direct sun (at least 4-6 hours) | Water through the first growing season, then only in severe drought, every 2-3 weeks at most | Mildly toxic to pets |
| Blonde Ambition Rush | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet at all times | Pet-safe |
| Blonde Sedge | Bright indirect light (just back from a sunny window) | Moderate; drought-tolerant once established | Pet-safe |
| Blood Banana | Direct sun (at least 4-6 hours) | Roughly weekly in active growth; every 10-14 days in winter | Pet-safe |
| Blood-Cupped Pink | Direct sun (at least 4-6 hours) | Infrequent; highly drought-tolerant once established | Mildly toxic to pets |
| Blood-red Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; keep medium consistently lightly moist | Pet-safe |
| Blood-red trumpet vine | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established. | Mildly toxic to pets |
| Bloodleaf Plant | Bright indirect light (just back from a sunny window) | Every 7 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Blue Arrow Juniper | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing, then deep occasional watering | Mildly toxic to pets |
| Blue Ash | Direct sun (at least 4-6 hours) | Regular in first 2 years; infrequent once established | Mildly toxic to pets |
| Blue Atlas Cedar | Direct sun (at least 4-6 hours) | Every 1-2 weeks while establishing, then rarely | Mildly toxic to pets |
| Blue Atlas Cedar | Direct sun (at least 4-6 hours) | Infrequently once established; moderate during first 2 years | Mildly toxic to pets |
| Blue Bird Rose of Sharon | Direct sun (at least 4-6 hours) | Weekly during dry spells; reduce once established | Mildly toxic to pets |
| Blue blossom | Direct sun (at least 4-6 hours) | Weekly during establishment; minimal irrigation once established (drought-tolerant) | Mildly toxic to pets |
| Blue Boy cornflower | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Blue Carpet Juniper | Direct sun (at least 4-6 hours) | Every 7-10 days for the first season, then only in extended drought | Mildly toxic to pets |
| Blue Chalk Sticks | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; every 4–6 weeks in winter | Toxic to pets |
| Blue Chalk Sticks | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 12-18 days in growth | Toxic to pets |
| Blue Chalksticks | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 4–6 weeks in winter | Toxic to pets |
| Blue Chalksticks | Direct sun (at least 4-6 hours) | Roughly every 2-3 weeks in spring and summer; about once a month or less in winter. | Toxic to pets |
| Blue China Fir | Direct sun (at least 4-6 hours) | Regular when young; moderate once established | Mildly toxic to pets |
| Blue Cloud Cranesbill | Bright indirect light (just back from a sunny window) | Moderate; water in dry spells | Mildly toxic to pets |
| Blue Columbine | Medium indirect light (a couple of metres from a window) | Water when the top 3 cm of soil dries, about weekly | Mildly toxic to pets |
| Blue Creeping Speedwell | Direct sun (at least 4-6 hours) | Moderate; allow the top few centimetres to dry between waterings | Pet-safe |
| Blue Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks | Toxic to pets |
| Blue dawn flower | Direct sun (at least 4-6 hours) | Once or twice weekly during dry periods; established plants are relatively drought-tolerant | Toxic to pets |
| Blue Dendrobium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 2–3 weeks in winter | Pet-safe |
| Blue Echeveria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Blue Fescue | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; sparingly once established | Mildly toxic to pets |
| Blue Giant Sequoia | Direct sun (at least 4-6 hours) | Deeply weekly for 3–5 years during establishment | Pet-safe |
| Blue Grama Grass | Direct sun (at least 4-6 hours) | Water to establish in the first season; thereafter only in extreme drought, roughly every 2-3 weeks if at all | Mildly toxic to pets |
| Blue Hair Grass | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; water sparingly | Pet-safe |
| Blue Holly 'Blue Princess' | Bright indirect light (just back from a sunny window) | Weekly while establishing, then during dry spells | Toxic to pets |
| Blue Latan Palm | Direct sun (at least 4-6 hours) | Every 7–10 days in growing season; less in winter | Pet-safe |
| Blue Lyme Grass | Direct sun (at least 4-6 hours) | Drought-tolerant; water only in prolonged dry spells once established | Mildly toxic to pets |
| Blue Mistflower | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water weekly, more in heat or sandy soil | Mildly toxic to pets |
| Blue Moor Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; rarely thereafter except in extended drought | Mildly toxic to pets |
| Blue Oat Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Blue Oat Grass | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing, then occasionally | Mildly toxic to pets |
| Blue Pacific Shore Juniper | Direct sun (at least 4-6 hours) | Low — very drought and salt tolerant once established | Mildly toxic to pets |
| Blue Potato Bush | Direct sun (at least 4-6 hours) | Every 4-6 days in summer, every 10-14 days in cooler months | Toxic to pets |
| Blue Prince Holly | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 7-10 days in dry spells | Toxic to pets |
| Blue Princess Holly | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 7-10 days in dry spells | Toxic to pets |
| Blue Ridge Creeping Phlox | Medium indirect light (a couple of metres from a window) | Weekly in the first season; every 1–2 weeks once established | Pet-safe |
| Blue Rug Juniper | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Blue sedge | Bright indirect light (just back from a sunny window) | Water regularly until established; minimal thereafter | Pet-safe |
| Blue Spruce Stonecrop | Direct sun (at least 4-6 hours) | Every 14-21 days in spring and summer; monthly or less in winter | Pet-safe |
| Blue Spurflower | Medium indirect light (a couple of metres from a window) | Moderate — water once or twice weekly in summer; reduce significantly in winter | Mildly toxic to pets |
| Blue Star Juniper | Direct sun (at least 4-6 hours) | Water through the first season; afterward only in prolonged dry spells | Toxic to pets |
| Blue Torch Cactus | Direct sun (at least 4-6 hours) | When the mix is fully dry, about every 2-3 weeks in summer; nearly none in winter | Mildly toxic to pets |
| Blue Tulp | Direct sun (at least 4-6 hours) | Water sparingly in autumn and winter when growing; completely dry in summer | Toxic to pets |
| Blue Vanda | Direct sun (at least 4-6 hours) | Daily in warm months when roots silver over; every 2-3 days in cool, dim weather | Pet-safe |
| Blue Violet Iochroma | Direct sun (at least 4-6 hours) | Every 4-6 days in summer, every 10-14 days in winter | Toxic to pets |
| Blue Wild Indigo | Direct sun (at least 4-6 hours) | Water the first year; established plants rarely need watering | Mildly toxic to pets |
| Blue Wild Rye | Direct sun (at least 4-6 hours) | Water moderately when the top few cm of soil dry; avoid soggy conditions | Mildly toxic to pets |
| Blue Zinger Sedge | Direct sun (at least 4-6 hours) | Water to establish, then drought-tolerant; occasional watering in long dry spells | Mildly toxic to pets |
| Blue-green Adenia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; withhold entirely in winter dormancy | Toxic to pets |
| Blue-stemmed Polypody | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and summer; every 10–14 days in winter | Pet-safe |
| bluejoint reedgrass | Direct sun (at least 4-6 hours) | Keep consistently moist to wet; suited to boggy and seasonally flooded ground | Pet-safe |
| Bluish Sage | Direct sun (at least 4-6 hours) | Low — water when soil is dry 5–7 cm deep | Mildly toxic to pets |
| Blume's Typhonium | Bright indirect light (just back from a sunny window) | Moderate when in growth; withhold completely in dormancy | Toxic to pets |
| Blunt-leaf Zamia | Bright indirect light (just back from a sunny window) | Every 10–14 days; reduce to monthly in cooler or drier months | Toxic to pets |
| Blushing Dunce Cap | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; very sparingly in autumn; almost none in winter | Pet-safe |
| Boat Orchid | Bright indirect light (just back from a sunny window) | Spring-summer: keep evenly moist, roughly weekly; autumn-winter: reduce to weekly or fortnightly when barely damp | Mildly toxic to pets |
| Boat-Leaf Orthophytum | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; every 14–21 days in winter | Pet-safe |
| Bodinier's beautyberry | Direct sun (at least 4-6 hours) | Weekly during the first two growing seasons; every 2–3 weeks once established | Mildly toxic to pets |
| Boehmer's Dunce Cap | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer (active growing season); once monthly or less in winter | Mildly toxic to pets |
| Bog Laurel | Bright indirect light (just back from a sunny window) | Frequent; keep soil consistently moist to wet | Toxic to pets |
| Boissier's Silverbush | Direct sun (at least 4-6 hours) | Very infrequent once established | Mildly toxic to pets |
| Boivin's Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in the growing season; every 4–6 weeks in winter | Pet-safe |
| Bokhara Iris | Direct sun (at least 4-6 hours) | Moderate in spring; completely dry from midsummer to autumn | Toxic to pets |
| Bolivian Torch Cactus | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; once a month or less in winter | Mildly toxic to pets |
| Bolivian Zamia | Bright indirect light (just back from a sunny window) | Every 7–14 days; reduce to every 21 days in cooler months | Toxic to pets |
| Bolus' Stomatium | Bright indirect light (just back from a sunny window) | Very sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Bonica Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | Pet-safe |
| Bonsai Pachypodium | Direct sun (at least 4-6 hours) | Every 14–21 days in summer; none or barely any in winter dormancy | Toxic to pets |
| Boojum Tree | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Borden's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Border Forsythia | Direct sun (at least 4-6 hours) | Weekly during the first year, then only in prolonged drought | Pet-safe |
| Bosnian Pine | Direct sun (at least 4-6 hours) | Water young trees weekly in dry spells; established trees rarely need it | Mildly toxic to pets |
| Bosnian Pine 'Compact Gem' | Direct sun (at least 4-6 hours) | Water weekly in dry spells while establishing; little needed thereafter | Mildly toxic to pets |
| Boston Fern | Medium indirect light (a couple of metres from a window) | Every 3–4 days in spring and summer; every 5–7 days in winter | Pet-safe |
| Boston Fern 'Fluffy Ruffles' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 3-5 days | Pet-safe |
| Botterboom | Direct sun (at least 4-6 hours) | Every 2–3 weeks in winter–spring (active), essentially none in summer (dormant) | Toxic to pets |
| Bottle Palm | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Bougainvillea | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry out | Mildly toxic to pets |
| Bougainvillea 'Barbara Karst' | Direct sun (at least 4-6 hours) | Deeply but infrequently, only when the top 5 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| Bougainvillea 'Miss Alice' | Direct sun (at least 4-6 hours) | Allow the top few centimetres of compost to dry between waterings; keeping it slightly dry encourages flowering | Mildly toxic to pets |
| Bougainvillea 'San Diego Red' | Direct sun (at least 4-6 hours) | Deep soak only when the top 5 cm of soil dries, about every 7-14 days | Pet-safe |
| Bougainvillea spectabilis | Direct sun (at least 4-6 hours) | Let the top few centimetres of soil dry between waterings; deliberately keep it on the dry side to trigger bracts | Mildly toxic to pets |
| Boulder Blue Fescue | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; sparingly once established | Mildly toxic to pets |
| Boulevard Cypress | Direct sun (at least 4-6 hours) | Every 4-7 days while establishing, then when the top few cm of soil dry | Mildly toxic to pets |
| Bove's Jerusalem Sage | Direct sun (at least 4-6 hours) | Low — once every 2–3 weeks during active growth; essentially none from late autumn to early spring | Mildly toxic to pets |
| Bow Bells Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; every 10–14 days in winter | Pet-safe |
| Bower Vine | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in cool or dry winter rest | Mildly toxic to pets |
| Bowles Golden Sedge | Direct sun (at least 4-6 hours) | Keep wet to constantly moist; never allow to dry out | Mildly toxic to pets |
| box honeysuckle | Bright indirect light (just back from a sunny window) | Regularly during the first season; drought-tolerant once established | Mildly toxic to pets |
| Bracken's Brown Beauty Magnolia | Direct sun (at least 4-6 hours) | Deeply weekly during the first 2–3 years; every 2–3 weeks once established | Mildly toxic to pets |
| Bracteate Rhinephyllum | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring–summer; minimal in winter | Pet-safe |
| Bracted Aechmea | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Bracted Lipstick Plant | Bright indirect light (just back from a sunny window) | Water when the top 2–3 cm of mix has dried; roughly every 7 days in summer, every 10–14 days in winter | Pet-safe |
| Bracted Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in winter | Pet-safe |
| Bracted Spiderwort | Bright indirect light (just back from a sunny window) | Fortnightly or less once established | Mildly toxic to pets |
| Bradbury's Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; rarely in winter | Mildly toxic to pets |
| Brade's Begonia | Medium indirect light (a couple of metres from a window) | When the top 1–2 cm of soil feels dry | Toxic to pets |
| Brahea Edulis | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-14 days in growth | Mildly toxic to pets |
| Brain Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in spring and summer; nearly dry through winter | Pet-safe |
| Brassavola digbyana | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; far less in winter rest, every 2-3 weeks | Pet-safe |
| Braun's Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days; keep evenly moist | Pet-safe |
| Braun's Holly Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days; maintain consistently moist but well-drained soil | Pet-safe |
| Brazilian Jasmine | Direct sun (at least 4-6 hours) | Let the top 2-3 cm of soil dry, then water; roughly every 4-7 days, more often in heat | Mildly toxic to pets |
| Brazilian Plume | Bright indirect light (just back from a sunny window) | Regularly — keep soil consistently moist but never waterlogged | Pet-safe |
| Brazilian Tree Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season, once a week in winter | Pet-safe |
| Bread Tree Cycad | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days in growth | Toxic to pets |
| Breadfruit | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water deeply 2-3 times a week in active growth | Mildly toxic to pets |
| Breadnut | Direct sun (at least 4-6 hours) | Water young trees 2–3 times per week; established trees are moderately drought tolerant but benefit from weekly deep irrigation in dry seasons. | Pet-safe |
| Breadtree | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; every 4–6 weeks in winter | Toxic to pets |
| Bressingham White Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days during the growing season; reduce in autumn and winter | Pet-safe |
| Brewer Spruce | Direct sun (at least 4-6 hours) | Moderate — water regularly during establishment; tolerates summer drought once established | Pet-safe |
| Brewer's Weeping Spruce | Direct sun (at least 4-6 hours) | Deeply every 7–10 days in summer; reduce in winter but do not allow soil to fully dry | Mildly toxic to pets |
| Bridal Bouquet Plumeria | Direct sun (at least 4-6 hours) | Every 7–10 days in active growth; reduce to every 3–4 weeks in cooler months | Toxic to pets |
| Bridal Wreath Spirea | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry, about weekly while establishing | Pet-safe |
| Brilliant Hibiscus | Direct sun (at least 4-6 hours) | Regularly during growth; reduce in winter | Mildly toxic to pets |
| Brilliantelse Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days; never allow to fully dry out | Pet-safe |
| Brilliantissima red chokeberry | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once established | Pet-safe |
| Bristle-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow top half of soil to dry) | Pet-safe |
| Bristlecone Pine | Direct sun (at least 4-6 hours) | Infrequent deep watering, roughly every 2-3 weeks; allow thorough drying | Mildly toxic to pets |
| Bristly Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; medium kept consistently moist | Pet-safe |
| British Yellowhead | Direct sun (at least 4-6 hours) | Once or twice per week; drought-tolerant once established | Pet-safe |
| Britten's Tiger Jaws | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season (late summer–autumn); minimal in winter and spring | Pet-safe |
| Brittle Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in warm months; every 4–5 days in winter | Pet-safe |
| Broad Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–4 days in the growing season; every 5–7 days in winter | Pet-safe |
| Broad-leaved Helleborine | Medium indirect light (a couple of metres from a window) | Regular during dry spells; keep consistently moist but not waterlogged | Mildly toxic to pets |
| Broad-Leaved Lime | Bright indirect light (just back from a sunny window) | Weekly during establishment; supplemental watering in prolonged drought | Pet-safe |
| Broad-Leaved Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Pet-safe |
| Broad-Petalled Cranesbill | Bright indirect light (just back from a sunny window) | Once or twice a week in the growing season; less in winter | Pet-safe |
| Broad-Sepal Gongora | Bright indirect light (just back from a sunny window) | Every 4–6 days during growth; every 10–14 days in winter | Pet-safe |
| Broadleaf Bamboo | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer, once per week in winter | Pet-safe |
| Broadleaf Stonecrop | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Pet-safe |
| Bronze Sedge | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Mildly toxic to pets |
| Broomsedge Bluestem | Direct sun (at least 4-6 hours) | Rainfall sufficient; no supplemental irrigation needed once established | Pet-safe |
| Brown-eyed Susan | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly weekly, more during drought | Mildly toxic to pets |
| Brush Cherry | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Pet-safe |
| Brush-tipped Bursera | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; withhold almost entirely in winter dormancy | Mildly toxic to pets |
| Buccaneer Palm | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Buchholtz's Billbergia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks (soil); cup refreshed every 3–4 weeks | Pet-safe |
| Buchholz's Tylecodon | Bright indirect light (just back from a sunny window) | Every 10–14 days when actively growing (autumn–spring); once per month or less in summer | Toxic to pets |
| Buckley's Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very little in winter | Mildly toxic to pets |
| Buddha's Hand Citron | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, typically every 5-10 days | Toxic to pets |
| Buddha's Temple | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth; minimal in winter | Toxic to pets |
| Buddleja 'Lo and Behold Blue Chip' | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in dry spells | Mildly toxic to pets |
| Buddleja 'Miss Ruby' | Direct sun (at least 4-6 hours) | Weekly during establishment, then only in drought | Mildly toxic to pets |
| Buddleja alternifolia | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in drought | Mildly toxic to pets |
| Buddleja davidii 'White Profusion' | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in dry spells | Mildly toxic to pets |
| Buddleja globosa | Direct sun (at least 4-6 hours) | Weekly while establishing; occasional deep watering in summer droughts once mature | Mildly toxic to pets |
| Bulbophyllum barbigerum | Medium indirect light (a couple of metres from a window) | Every 2-4 days; keep evenly moist | Pet-safe |
| Bulbophyllum Elizabeth Ann | Medium indirect light (a couple of metres from a window) | Every 2-4 days; keep consistently moist | Pet-safe |
| Bulbophyllum falcatum | Bright indirect light (just back from a sunny window) | Water when the roots and medium approach dryness, roughly every 2-4 days when mounted, less in pots | Pet-safe |
| Bulbophyllum longissimum | Bright indirect light (just back from a sunny window) | Water as the medium nears dryness, roughly every 2-4 days; more often when mounted in warm weather | Pet-safe |
| Bulbophyllum vaginatum | Bright indirect light (just back from a sunny window) | Water as the medium approaches dryness, around every 2-4 days; daily when mounted in heat | Pet-safe |
| Bulbous Buttercup | Direct sun (at least 4-6 hours) | Once weekly or less; drought-tolerant once established | Toxic to pets |
| Bulbous Corydalis | Medium indirect light (a couple of metres from a window) | Rely on natural rainfall during spring growth; no irrigation needed once dormant in summer | Toxic to pets |
| Bulbous Trichodiadema | Direct sun (at least 4-6 hours) | Every 2–3 weeks during spring and summer; once a month or less in winter | Pet-safe |
| Bullate Nautilocalyx | Medium indirect light (a couple of metres from a window) | Every 2–4 days in the growing season; reduce to once weekly in autumn–winter | Pet-safe |
| Bunny ears cactus | Direct sun (at least 4-6 hours) | When the compost is fully dry, roughly every 2-3 weeks in spring and summer | Pet-safe |
| Burchard's Caralluma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and autumn; very sparingly in summer and winter | Mildly toxic to pets |
| Burgundy Glow Bugle | Medium indirect light (a couple of metres from a window) | Moderate; consistently moist but not waterlogged | Mildly toxic to pets |
| Burgundy Lace Japanese Painted Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season, reduce significantly in winter dormancy | Pet-safe |
| Burgundy Periwinkle | Medium indirect light (a couple of metres from a window) | Weekly during establishment; every 2–3 weeks once established | Toxic to pets |
| Burke's Raphionacme | Bright indirect light (just back from a sunny window) | Weekly to bi-weekly during active growth; none in winter | Mildly toxic to pets |
| Burkwood Viburnum | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil dries, roughly weekly during establishment | Pet-safe |
| Burnet Rose | Direct sun (at least 4-6 hours) | Weekly during establishment; rarely once mature | Pet-safe |
| Burrawang | Medium indirect light (a couple of metres from a window) | Water every 2–3 weeks in growing season, monthly or less in winter | Toxic to pets |
| Burrawang Palm | Bright indirect light (just back from a sunny window) | Every 2–3 weeks | Toxic to pets |
| Burton's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; reduce to every 3–4 weeks in winter | Pet-safe |
| Bush Allamanda | Direct sun (at least 4-6 hours) | Every 5–7 days in the growing season; reduce to every 10–14 days in winter | Toxic to pets |
| Bush Cycad | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; monthly or less in winter | Toxic to pets |
| Bush Hoya | Bright indirect light (just back from a sunny window) | Roughly weekly in summer; every 10-14 days in winter | Pet-safe |
| Bush Vetch | Bright indirect light (just back from a sunny window) | Low to moderate — maintain moderate soil moisture | Mildly toxic to pets |
| Bushgrass | Medium indirect light (a couple of metres from a window) | Moderate — water regularly to establish, then largely drought-tolerant | Pet-safe |
| Butia Yatay | Direct sun (at least 4-6 hours) | When the top 4-6 cm of soil is dry, roughly every 10-14 days while establishing, sparingly once mature | Mildly toxic to pets |
| Butt's bougainvillea | Direct sun (at least 4-6 hours) | Every 7–10 days in active growth; reduce significantly to trigger blooming | Mildly toxic to pets |
| Butterfield Holly Fern | Low light (north window or shaded room) | Every 7–14 days; much less in winter | Pet-safe |
| Butterfly bush | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; drought-tolerant once established | Mildly toxic to pets |
| Butterfly Bush 'Black Knight' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly in the first season, then only in prolonged drought | Mildly toxic to pets |
| Butterfly Bush 'Pink Delight' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly through the first year, then sparingly | Mildly toxic to pets |
| Butterfly Weed | Direct sun (at least 4-6 hours) | Water to establish, then only during prolonged drought; mature plants rarely need watering | Toxic to pets |
| Button Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep nearly dry in winter | Pet-safe |
| Button Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Byfield Fern Cycad | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks | Toxic to pets |
| Byzantine Gladiolus | Direct sun (at least 4-6 hours) | Moderate during spring growth; minimal in summer after dormancy | Toxic to pets |
| C.D. Eason bell heather | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once settled | Pet-safe |
| Cabada Palm | Direct sun (at least 4-6 hours) | Every 3–5 days when young; drought-tolerant once established | Pet-safe |
| Cabbage Palm | Direct sun (at least 4-6 hours) | Infrequent once established, when the top several centimetres are dry, roughly every 1-2 weeks | Mildly toxic to pets |
| Cacao | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the surface just begins to dry, often 2-3 times weekly | Toxic to pets |
| Cacti (general care) | Direct sun (at least 4-6 hours) | Soak when the mix is bone dry — roughly every 2-4 weeks in summer | Pet-safe |
| Cadiz Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; very rarely in winter | Mildly toxic to pets |
| Caladium 'Carolyn Whorton' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 4-6 days in active growth | Toxic to pets |
| Calathea 'Flamestar' | Bright indirect light (just back from a sunny window) | Roughly weekly; water when the top 2-3 cm (about 1 inch) of soil feels dry | Pet-safe |
| Calathea 'Flamestar' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil dries, roughly every 5-7 days in growth | Pet-safe |
| Calathea Bacillaris | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil starts to dry, roughly every 5-7 days in growth | Pet-safe |
| Calathea Cylindrica | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is just dry, roughly every 5-7 days in growth | Pet-safe |
| Calathea Dottie | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Calathea Freddie | Bright indirect light (just back from a sunny window) | When the top inch of soil is dry, roughly weekly in spring and summer and every 10-14 days in winter | Pet-safe |
| Calathea Leopardina | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Calathea Lietzei | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Calathea Loeseneri (Brazilian Star) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil dries, roughly every 5-7 days in growth | Pet-safe |
| Calathea Setosa | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Calathea White Star | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of soil is just dry, roughly every 5-7 days | Pet-safe |
| Calceolaria Herbeohybrida | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost feels dry, roughly every 2-4 days while in flower | Mildly toxic to pets |
| Calendula | Direct sun (at least 4-6 hours) | Moderate — roughly weekly once established | Pet-safe |
| Calendula 'Indian Prince' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Calendula 'Radio' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Calico Aster | Bright indirect light (just back from a sunny window) | Water to establish, then occasionally; tolerates dry soil | Pet-safe |
| Califano's Dioon | Direct sun (at least 4-6 hours) | Every 3–5 weeks in summer; once every 6–8 weeks in winter | Toxic to pets |
| California Barrel Cactus | Direct sun (at least 4-6 hours) | Every 2-4 weeks in active growth; none in winter | Mildly toxic to pets |
| California Fan Palm | Direct sun (at least 4-6 hours) | Deeply but infrequently, every 10-14 days once established; more while young | Mildly toxic to pets |
| California Fawn Lily | Medium indirect light (a couple of metres from a window) | Regular in spring growing season; minimal during summer dormancy | Mildly toxic to pets |
| California Giant Chain Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days; keep soil consistently moist but not waterlogged | Pet-safe |
| California Juniper | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, often every 3-5 days in heat | Mildly toxic to pets |
| California Nutmeg | Medium indirect light (a couple of metres from a window) | Every 7–10 days; do not allow to dry out fully, especially when young | Mildly toxic to pets |
| California poppy | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent during germination | Mildly toxic to pets |
| California Shield Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; reduce in winter | Pet-safe |
| California Sunset | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn/winter | Pet-safe |
| Callicarpa 'Pearl Glam' | Direct sun (at least 4-6 hours) | Water weekly during the first season; established plants are fairly drought-tolerant and need water mainly in dry spells | Pet-safe |
| Callicarpa americana | Bright indirect light (just back from a sunny window) | Water weekly while establishing; once established, only during prolonged drought | Mildly toxic to pets |
| Callicarpa bodinieri var. giraldii 'Profusion' | Bright indirect light (just back from a sunny window) | Water weekly during establishment and in dry spells; established plants are moderately drought-tolerant | Mildly toxic to pets |
| Callicarpa dichotoma | Bright indirect light (just back from a sunny window) | Water weekly during establishment and dry periods; moderately drought-tolerant once established | Mildly toxic to pets |
| Callicarpa japonica | Bright indirect light (just back from a sunny window) | Water weekly while establishing and during droughts; moderately drought-tolerant once settled | Mildly toxic to pets |
| Callisia Repens 'Gold' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 6-10 days | Mildly toxic to pets |
| Callisia Repens 'Pink Lady' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 6-10 days | Mildly toxic to pets |
| Camas | Bright indirect light (just back from a sunny window) | Regular during spring growth; tolerates summer drought when dormant | Pet-safe |
| Cambria Orchid | Bright indirect light (just back from a sunny window) | When the surface of the mix begins to dry, roughly every 4-7 days | Pet-safe |
| Cambuci | Direct sun (at least 4-6 hours) | Weekly; more frequent during fruit development | Mildly toxic to pets |
| Camellia 'Donation' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist in late summer | Pet-safe |
| Camellia 'Jury's Yellow' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply once or twice weekly in summer, especially during bud set | Pet-safe |
| Cameroon Cycad | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season; monthly in winter | Toxic to pets |
| Campanula lactiflora 'Loddon Anna' | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply in dry spells, roughly weekly once established | Mildly toxic to pets |
| Campanula persicifolia | Direct sun (at least 4-6 hours) | Water during establishment and dry spells; roughly weekly in summer drought once settled | Mildly toxic to pets |
| Campanula portenschlagiana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly weekly in summer | Mildly toxic to pets |
| Campanula poscharskyana | Bright indirect light (just back from a sunny window) | When the top few centimetres of soil dry out, weekly in hot spells | Mildly toxic to pets |
| Camphor-leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Campsis grandiflora | Direct sun (at least 4-6 hours) | When the top 5 cm of soil dries, about every 7-10 days while establishing | Mildly toxic to pets |
| Campsis radicans | Direct sun (at least 4-6 hours) | When the top 5 cm of soil dries, about every 7-14 days for young plants | Mildly toxic to pets |
| Campsis x tagliabuana 'Madame Galen' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil dries, about every 7-14 days while establishing | Mildly toxic to pets |
| Camu Camu | Bright indirect light (just back from a sunny window) | Every 2–4 days; keep consistently moist to wet | Pet-safe |
| Canada Violet | Medium indirect light (a couple of metres from a window) | Weekly; more frequently in warm or dry periods | Mildly toxic to pets |
| Canadian Yew | Low light (north window or shaded room) | Weekly during establishment; every 1–2 weeks once established | Toxic to pets |
| Canary Island Date Palm | Direct sun (at least 4-6 hours) | Every 7-10 days in summer; roughly every 2-3 weeks in winter | Pet-safe |
| Canary Island Lavender | Direct sun (at least 4-6 hours) | Every 2 weeks in the growing season; sparingly in winter | Toxic to pets |
| Canary Island Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; minimal in cool or wet periods | Pet-safe |
| Canary Island Sea Lavender | Direct sun (at least 4-6 hours) | Every 1–2 weeks in growth; monthly in winter | Pet-safe |
| Candelabra Euphorbia | Direct sun (at least 4-6 hours) | When the mix is completely dry, about every 2-3 weeks in summer | Toxic to pets |
| Candelabra Lily | Direct sun (at least 4-6 hours) | Water moderately from first autumn rains (flower emergence) through winter-spring leaf period; keep bone dry all summer | Toxic to pets |
| Candelabra Sage | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season | Pet-safe |
| Candelabra Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn–spring (active), near-zero in summer (dormant) | Toxic to pets |
| Candle plant | Bright indirect light (just back from a sunny window) | When the soil is fully dry; roughly every 2-3 weeks in growth, far less in summer dormancy | Toxic to pets |
| Candle Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during autumn and spring active growth; once a month or less in summer dormancy | Toxic to pets |
| Candy Stripe Creeping Phlox | Direct sun (at least 4-6 hours) | Every 7–10 days during the establishment year; drought-tolerant thereafter | Pet-safe |
| Canistel | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-9 days in growth | Mildly toxic to pets |
| Canna-leaved Peace Lily | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14 days in winter | Toxic to pets |
| Cantabrian Draba | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Canyon Liveforever | Direct sun (at least 4-6 hours) | Every 2–3 weeks in winter/spring; minimal to none in summer | Pet-safe |
| Canyon Sage | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established | Pet-safe |
| Cape Clubfoot | Direct sun (at least 4-6 hours) | Every 14–21 days in summer; once monthly or less in winter | Toxic to pets |
| Cape daisy | Direct sun (at least 4-6 hours) | Every 4–6 days once established; more frequently in containers during warm weather | Mildly toxic to pets |
| Cape Fockea | Bright indirect light (just back from a sunny window) | Every 10–14 days during spring and summer growing season; once a month or less in winter | Mildly toxic to pets |
| Cape Gold Everlasting | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Mildly toxic to pets |
| Cape honeysuckle | Direct sun (at least 4-6 hours) | Weekly when young; every 2–4 weeks once established. | Mildly toxic to pets |
| Cape jewels | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 5–7 days in borders | Pet-safe |
| Cape Mallow | Direct sun (at least 4-6 hours) | Water when the top 2–3 cm of soil is dry | Mildly toxic to pets |
| Caradonna Salvia | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Pet-safe |
| Caralluma acutangula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Caralluma europaea | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; keep nearly dry October-March | Mildly toxic to pets |
| Caralluma hesperidum | Direct sun (at least 4-6 hours) | When soil is bone-dry, about every 10-14 days in active growth; keep nearly dry in winter | Mildly toxic to pets |
| Cardboard Cycad | Direct sun (at least 4-6 hours) | When the soil is dry well down, roughly every 12-16 days in growth | Toxic to pets |
| Cardinal Royal rowan | Direct sun (at least 4-6 hours) | Regular during the first season; drought-tolerant once established | Mildly toxic to pets |
| Carex pendula | Medium indirect light (a couple of metres from a window) | Keep soil moist; water in dry spells | Mildly toxic to pets |
| Carnarvon Fan Palm | Direct sun (at least 4-6 hours) | Weekly during active growth; every 2–3 weeks when established | Pet-safe |
| Carnation of India | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth, every 10-14 days in winter | Toxic to pets |
| Carob | Direct sun (at least 4-6 hours) | When soil is dry well below the surface, every 1-3 weeks once established | Pet-safe |
| Carolina Hemlock | Bright indirect light (just back from a sunny window) | Weekly during establishment; monthly deep watering once established in cool climates | Pet-safe |
| Carpathian bellflower | Direct sun (at least 4-6 hours) | Every 5–7 days during active growth; moderate moisture needs | Pet-safe |
| Carrion Flower (Stapelia gigantea) | Direct sun (at least 4-6 hours) | Every 2-3 weeks in active growth (spring-autumn); keep nearly dry in winter | Pet-safe |
| Carrot-leaved Pelargonium | Direct sun (at least 4-6 hours) | Water when the top 2–3 cm of compost is dry during growth (autumn–spring); completely dry in summer dormancy | Toxic to pets |
| Caryopteris incana | Direct sun (at least 4-6 hours) | Weekly while establishing, then only during drought | Mildly toxic to pets |
| Caryopteris x clandonensis 'Dark Knight' | Direct sun (at least 4-6 hours) | Weekly during establishment, then sparingly in dry spells | Mildly toxic to pets |
| Caryopteris x clandonensis 'Heavenly Blue' | Direct sun (at least 4-6 hours) | Weekly while establishing, then only during prolonged drought | Mildly toxic to pets |
| Caryopteris x clandonensis 'Worcester Gold' | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in drought | Mildly toxic to pets |
| Cas Guava | Direct sun (at least 4-6 hours) | Water deeply 2–3 times per week in the growing season; reduce to once weekly in winter. | Pet-safe |
| Cascade Purple Aubrieta | Direct sun (at least 4-6 hours) | Weekly during active growth; minimal in summer dormancy | Pet-safe |
| Cascadia trailing petunia | Direct sun (at least 4-6 hours) | Every 2-3 days in warm weather; check daily in summer heat | Pet-safe |
| Case's Ixora | Direct sun (at least 4-6 hours) | Every 2-3 days during warm months, reduce to weekly in cooler weather | Mildly toxic to pets |
| Cast iron plant | Low light (north window or shaded room) | When the top 3 cm of soil is dry, every 10-14 days | Pet-safe |
| Castilian Heron's Bill | Direct sun (at least 4-6 hours) | Water sparingly every 10-14 days in the growing season; almost none from late autumn to spring | Mildly toxic to pets |
| Cat's Claw Creeper | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant when established | Mildly toxic to pets |
| Cat's Claw Vine | Direct sun (at least 4-6 hours) | Every 7–14 days; highly drought-tolerant once established | Mildly toxic to pets |
| Cat's Jaws | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth and much less in summer rest | Mildly toxic to pets |
| Cat's-ear | Direct sun (at least 4-6 hours) | Low — very drought-tolerant once established | Mildly toxic to pets |
| Catalpa bignonioides | Direct sun (at least 4-6 hours) | Weekly while young; established trees are fairly drought-tolerant | Mildly toxic to pets |
| Catalpa bignonioides 'Aurea' | Direct sun (at least 4-6 hours) | Weekly while establishing; moderate drought tolerance when mature | Mildly toxic to pets |
| Catalpa speciosa | Direct sun (at least 4-6 hours) | Weekly when young; notably drought-tolerant once established | Mildly toxic to pets |
| Catawba Rhododendron 'Roseum Elegans' | Bright indirect light (just back from a sunny window) | About weekly, deeper in heat and drought; water when the top 3-5 cm of soil is dry | Toxic to pets |
| Catharanthus roseus 'Cora Cascade Strawberry' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days | Toxic to pets |
| Catharanthus roseus 'Titan Polka Dot' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days | Toxic to pets |
| Catlin's Giant Bugle | Medium indirect light (a couple of metres from a window) | Once or twice weekly during establishment; once weekly once established | Mildly toxic to pets |
| Caucasian Comfrey | Medium indirect light (a couple of metres from a window) | Every 5–7 days during dry spells; self-sufficient in rainy climates | Mildly toxic to pets |
| Caucasian Draba | Direct sun (at least 4-6 hours) | Low — water only when soil is dry | Mildly toxic to pets |
| Caucasian Lily | Bright indirect light (just back from a sunny window) | Moderate — keep soil consistently moist but not waterlogged | Toxic to pets |
| Caucasian Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Cavendish Banana | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water when the top 2-3 cm dries, often every 2-4 days in active growth | Pet-safe |
| Ceanothus 'Concha' | Direct sun (at least 4-6 hours) | Water to establish, then little to no summer water once mature | Mildly toxic to pets |
| Ceanothus 'Puget Blue' | Direct sun (at least 4-6 hours) | Water to establish, then little to no summer water once mature | Mildly toxic to pets |
| Ceanothus 'Victoria' | Direct sun (at least 4-6 hours) | Water to establish in year one, then little to no summer water once settled | Mildly toxic to pets |
| Ceanothus americanus | Direct sun (at least 4-6 hours) | Weekly during the first season; rarely thereafter once established | Mildly toxic to pets |
| Ceanothus thyrsiflorus 'Skylark' | Direct sun (at least 4-6 hours) | Water to establish, then only occasional water; more summer-water tolerant than most ceanothus | Mildly toxic to pets |
| Cecile Brunner Climbing Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while young; established plants are fairly drought-tolerant and need water mainly in dry spells | Pet-safe |
| Cedar Bay Cherry | Direct sun (at least 4-6 hours) | Water established plants once or twice per week; newly planted specimens require daily watering for the first 4–6 weeks. | Pet-safe |
| Cedar of Lebanon | Direct sun (at least 4-6 hours) | Weekly during first 3 years; very drought-tolerant once established | Mildly toxic to pets |
| Cedros Island Liveforever | Direct sun (at least 4-6 hours) | Every 4–6 weeks in summer (dormant), every 2–3 weeks in winter–spring (active) | Pet-safe |
| Celebes Pepper | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow top 2–3 cm to dry between waterings | Mildly toxic to pets |
| Celosia argentea var. cristata 'Chief Mix' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Centaurea 'Amethyst in Snow' | Direct sun (at least 4-6 hours) | Weekly through the first season; established clumps are drought-tolerant | Pet-safe |
| Central Australian Cabbage Palm | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry between waterings | Pet-safe |
| Cephalophyllum tricolorum | Direct sun (at least 4-6 hours) | Only when the soil is fully dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Cephalotaxus 'Fastigiata' | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly weekly while establishing | Mildly toxic to pets |
| Cercestis Mirabilis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Cercidiphyllum japonicum | Bright indirect light (just back from a sunny window) | Weekly, keeping the soil consistently moist, especially in summer | Mildly toxic to pets |
| Cercidiphyllum japonicum 'Pendulum' | Bright indirect light (just back from a sunny window) | Weekly, keeping soil consistently moist, particularly in summer | Mildly toxic to pets |
| Cercis canadensis 'Forest Pansy' | Direct sun (at least 4-6 hours) | Weekly while establishing; deep soak during dry spells | Mildly toxic to pets |
| Cercis canadensis 'Lavender Twist' | Direct sun (at least 4-6 hours) | Weekly while establishing; supplement in drought | Mildly toxic to pets |
| Cercis siliquastrum | Direct sun (at least 4-6 hours) | Water regularly while young; rarely once established | Mildly toxic to pets |
| Ceropegia Ampliata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer | Mildly toxic to pets |
| Ceropegia distincta | Bright indirect light (just back from a sunny window) | When soil is dry, roughly every 10-14 days in growth; nearly dry in winter | Mildly toxic to pets |
| Ceropegia Haygarthii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 10-14 days in summer | Mildly toxic to pets |
| Ceropegia Sandersonii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Ceropegia woodii f. variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Cettos Achimenes | Bright indirect light (just back from a sunny window) | Evenly moist during the growing season; completely dry during winter dormancy | Pet-safe |
| Ceylon Date Palm | Direct sun (at least 4-6 hours) | Weekly during active growth; every 2–3 weeks in cooler or drier periods | Mildly toxic to pets |
| Chagual | Direct sun (at least 4-6 hours) | every 7–14 days in summer, rarely in winter | Pet-safe |
| Chain Pleurothallis | Bright indirect light (just back from a sunny window) | Every 2-3 days; do not allow to dry completely | Pet-safe |
| Chalk Milkwort | Direct sun (at least 4-6 hours) | Infrequently; drought-tolerant once established | Mildly toxic to pets |
| Chamaerops Humilis 'Vulcano' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 7-14 days in summer | Pet-safe |
| Chamaerops Humilis Cerifera | Direct sun (at least 4-6 hours) | When the top few cm of soil are dry; drought-tolerant once established | Pet-safe |
| Chamomile | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 7-10 days | Toxic to pets |
| Chandelier Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer | Toxic to pets |
| Chanet's Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; monthly or less in winter | Pet-safe |
| Changing Tibouchina | Direct sun (at least 4-6 hours) | Water regularly to maintain evenly moist soil during the growing season; reduce slightly in winter. | Mildly toxic to pets |
| Chanticleer ornamental pear | Direct sun (at least 4-6 hours) | Weekly for first 2 years; drought-tolerant once established | Mildly toxic to pets |
| Chantilly Peach snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil evenly moist but not waterlogged | Pet-safe |
| Chaparensis Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in cooler seasons | Pet-safe |
| Charlotte Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat | Pet-safe |
| Charming Puya | Direct sun (at least 4-6 hours) | Occasionally in summer, minimally in winter | Mildly toxic to pets |
| Cheddar Pink | Direct sun (at least 4-6 hours) | Sparingly — every 1–2 weeks in summer | Mildly toxic to pets |
| Cheiridopsis denticulata | Direct sun (at least 4-6 hours) | Autumn through spring; keep dry through summer dormancy | Mildly toxic to pets |
| Cheiridopsis robusta | Direct sun (at least 4-6 hours) | During autumn-spring growth when soil is bone dry; withhold through summer | Mildly toxic to pets |
| Cherapu | Direct sun (at least 4-6 hours) | Daily in dry periods; every 2–3 days with regular rainfall | Mildly toxic to pets |
| Cherokee Chief Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering; more in summer drought | Pet-safe |
| Cherry of the Río Grande | Direct sun (at least 4-6 hours) | Water thoroughly 2–3 times per week in summer; reduce to once every 7–10 days in winter. | Pet-safe |
| Cheshunt Pine | Bright indirect light (just back from a sunny window) | Water regularly to keep soil evenly moist; once or twice weekly in summer | Mildly toxic to pets |
| Chestnut Dioon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Toxic to pets |
| Chilean Bamboo | Bright indirect light (just back from a sunny window) | Weekly during establishment; twice weekly in dry summer heat | Pet-safe |
| Chilean Blue Crocus | Direct sun (at least 4-6 hours) | Regular watering during the spring growing season; completely dry from late spring through late autumn | Mildly toxic to pets |
| Chilean Sheep-eating Plant | Direct sun (at least 4-6 hours) | Sparingly — monthly or less in winter, once every 2–3 weeks in summer | Mildly toxic to pets |
| Chilean Wine Palm | Direct sun (at least 4-6 hours) | When the top 4-6 cm of soil is dry, roughly every 10-14 days while establishing, infrequently once mature | Mildly toxic to pets |
| Chin Cactus | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn; withhold in winter | Pet-safe |
| Chin Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| China Fir | Direct sun (at least 4-6 hours) | Keep soil moist; water regularly while young, then deeply during dry spells once established | Mildly toxic to pets |
| China Girl dogwood | Bright indirect light (just back from a sunny window) | Weekly in first 2–3 years; every 1–2 weeks in dry periods once established | Mildly toxic to pets |
| Chinese Arborvitae | Direct sun (at least 4-6 hours) | Moderate — water regularly until established; drought-tolerant once established | Pet-safe |
| Chinese astilbe | Medium indirect light (a couple of metres from a window) | Once or twice per week; more in hot weather | Pet-safe |
| Chinese Astilbe 'Visions' | Bright indirect light (just back from a sunny window) | Keep soil reliably moist; water every 3-5 days in summer | Mildly toxic to pets |
| Chinese Douglas Fir | Direct sun (at least 4-6 hours) | Weekly when young; every 2 weeks once established | Pet-safe |
| Chinese Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (spring–summer); sparingly in winter | Pet-safe |
| Chinese Dwarf Bamboo | Medium indirect light (a couple of metres from a window) | Once or twice per week during the growing season; reduce in winter | Pet-safe |
| Chinese Elm Bonsai | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is just drying, often every 2-4 days in summer | Mildly toxic to pets |
| Chinese Fan Palm | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; every 10-14 days in winter | Mildly toxic to pets |
| Chinese Flowering Quince | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil approaches dry, often daily in summer heat | Mildly toxic to pets |
| Chinese Gentian | Direct sun (at least 4-6 hours) | Regular, keeping soil evenly moist throughout the growing season; reduce in winter | Mildly toxic to pets |
| Chinese Hemlock | Bright indirect light (just back from a sunny window) | Every 1–2 weeks when young; every 2–3 weeks once established | Pet-safe |
| Chinese Holly Fern | Low light (north window or shaded room) | Every 6–10 days in summer, every 12–16 days in winter | Pet-safe |
| Chinese Ixora | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil consistently moist but never waterlogged | Mildly toxic to pets |
| Chinese Jade | Bright indirect light (just back from a sunny window) | Every 2–4 weeks (allow soil to dry completely between waterings) | Mildly toxic to pets |
| Chinese Juniper | Direct sun (at least 4-6 hours) | Low to moderate; water regularly until established, then drought-tolerant | Mildly toxic to pets |
| Chinese Lantern Plant | Direct sun (at least 4-6 hours) | Weekly during growing season; drought-tolerant once established | Toxic to pets |
| Chinese Larch | Direct sun (at least 4-6 hours) | Regular during establishment and growing season; reduced in dormancy | Pet-safe |
| Chinese peony | Direct sun (at least 4-6 hours) | Moderate — once or twice weekly during active growth; reduce significantly after foliage dies back in autumn | Mildly toxic to pets |
| Chinese Plum Yew | Medium indirect light (a couple of metres from a window) | Keep evenly moist; weekly in dry spells, more while establishing | Mildly toxic to pets |
| Chinese Sweetgum | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in winter | Mildly toxic to pets |
| Chinese Timber Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in the shooting season (spring); weekly otherwise | Pet-safe |
| Chinese Tupelo | Bright indirect light (just back from a sunny window) | Regularly during establishment; once or twice a week in dry spells | Pet-safe |
| Chinese Tylecodon | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); minimal or none in summer | Toxic to pets |
| Chinese Weeping Cypress | Direct sun (at least 4-6 hours) | Regular during establishment; drought-tolerant once mature | Pet-safe |
| Chinese Wild Ginger | Low light (north window or shaded room) | Water every 5–7 days, or when the top 2 cm of soil begins to dry | Mildly toxic to pets |
| Chinese Windmill Palm 'Bulgaria' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly weekly in summer | Toxic to pets |
| Chinese witch hazel | Bright indirect light (just back from a sunny window) | Regularly during establishment (first 2–3 years); once established, during dry periods in summer | Mildly toxic to pets |
| Chinese woodbine | Medium indirect light (a couple of metres from a window) | Weekly; do not allow the root zone to dry out | Mildly toxic to pets |
| Chiric Sanango | Bright indirect light (just back from a sunny window) | Every 5-7 days in active growth, every 10-14 days in winter | Toxic to pets |
| Chive-Leaved Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Mildly toxic to pets |
| Chocolate Soldier episcia | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season, every 10–14 days in winter | Pet-safe |
| Choisya 'Sundance' | Direct sun (at least 4-6 hours) | Water weekly while establishing, then only during extended dry periods | Mildly toxic to pets |
| Choisya 'White Dazzler' | Bright indirect light (just back from a sunny window) | Water weekly while establishing; mature plants need water only in dry spells | Mildly toxic to pets |
| Choisya ternata | Direct sun (at least 4-6 hours) | Water deeply once a week through the first two seasons, then only in prolonged dry spells | Mildly toxic to pets |
| Choisya x dewitteana 'Aztec Pearl' | Direct sun (at least 4-6 hours) | Water weekly through the first two years, then only in dry spells | Mildly toxic to pets |
| Christmas Jewels Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup weekly; water soil every 2–3 weeks | Pet-safe |
| Christmas Rose | Medium indirect light (a couple of metres from a window) | Keep evenly moist while establishing and during summer drought; established plants tolerate moderate dryness | Toxic to pets |
| Chrysanthemum | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in active growth | Toxic to pets |
| Chusan Palm | Bright indirect light (just back from a sunny window) | Weekly in summer, monthly in winter | Pet-safe |
| Cigarette Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through early spring; none or near-none in summer | Pet-safe |
| Cilician Fir | Direct sun (at least 4-6 hours) | Moderate; drought-tolerant once established | Pet-safe |
| Cinderella Miniature Rose | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water when the top 2-3 cm is dry, roughly twice weekly and more in heat | Pet-safe |
| Cinnamon Bunny Ears | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 2-3 weeks in summer; nearly dry in winter | Pet-safe |
| Cinnamon Fern | Medium indirect light (a couple of metres from a window) | 2-3 times per week; keep consistently moist | Pet-safe |
| Cissus rhombifolia 'Ellen Danica' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Clamshell Orchid | Medium indirect light (a couple of metres from a window) | Every 5–7 days; allow the mix to almost dry before rewetting | Pet-safe |
| Clamshell Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; every 10–14 days in winter | Pet-safe |
| Claret Cup Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; very little to none in winter | Mildly toxic to pets |
| Clarke's Cranesbill | Bright indirect light (just back from a sunny window) | Regularly during establishment; once established, once a week in dry periods | Pet-safe |
| Clasping Sage | Bright indirect light (just back from a sunny window) | Weekly to fortnightly | Pet-safe |
| Claw Sage | Direct sun (at least 4-6 hours) | Water when the top 3–5 cm of soil feels dry | Pet-safe |
| Cleft Phlox | Direct sun (at least 4-6 hours) | Every 10–14 days when establishing; monthly once established in dry periods | Pet-safe |
| Clematis | Direct sun (at least 4-6 hours) | Keep evenly moist; water newly planted and container clematis frequently | Toxic to pets |
| Clematis 'Bill MacKenzie' | Direct sun (at least 4-6 hours) | Deeply about once a week while growing; less once established | Toxic to pets |
| Clematis 'Hagley Hybrid' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about weekly in the growing season | Toxic to pets |
| Clematis 'Henryi' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about weekly in summer | Toxic to pets |
| Clematis 'Miss Bateman' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about weekly in the growing season | Toxic to pets |
| Clematis 'Multi Blue' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Clematis armandii | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly weekly in the growing season | Toxic to pets |
| Clematis integrifolia | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week through the growing season | Toxic to pets |
| Clematis montana | Direct sun (at least 4-6 hours) | Water regularly while establishing; mature plants are fairly drought-tolerant | Toxic to pets |
| Clematis tangutica | Direct sun (at least 4-6 hours) | Deeply about once a week in the growing season; less once established | Toxic to pets |
| Clematis viticella | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week through the growing season | Toxic to pets |
| Clethra alnifolia | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry weather, tolerant of wet ground | Mildly toxic to pets |
| Clethra alnifolia 'Hummingbird' | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry weather, tolerant of wet ground | Mildly toxic to pets |
| Clethra alnifolia 'Ruby Spice' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 1-2 times weekly in the first two seasons and during drought | Mildly toxic to pets |
| Cleveland Sage | Direct sun (at least 4-6 hours) | Very infrequent after establishment — once monthly or less in summer | Pet-safe |
| Cliff African violet | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Cliff Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Toxic to pets |
| Cliff Date Palm | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 4–6 weeks in winter | Mildly toxic to pets |
| Cliff Holly Fern | Low light (north window or shaded room) | Every 7–14 days; allow top half of soil to dry between waterings | Pet-safe |
| Climbing Aloe | Direct sun (at least 4-6 hours) | When the top few cm dry out, every 1-2 weeks in growth | Toxic to pets |
| Climbing Fetterbush | Medium indirect light (a couple of metres from a window) | Frequent; keep consistently moist to wet | Toxic to pets |
| Climbing Hydrangea | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply weekly in the first 2-3 years and during dry spells | Toxic to pets |
| Climbing Sundew | Bright indirect light (just back from a sunny window) | Tray method autumn–spring; bone dry summer dormancy | Mildly toxic to pets |
| Clinacanthus nutans | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, around every 3-5 days in warm weather | Mildly toxic to pets |
| Clivia | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Clouds of Perfume Woodland Phlox | Medium indirect light (a couple of metres from a window) | Weekly during the growing season; do not allow soil to dry out in summer | Pet-safe |
| Clumping Bamboo | Bright indirect light (just back from a sunny window) | Twice to three times per week during establishment; weekly once established | Pet-safe |
| Cluster-Headed Mezobromelia | Medium indirect light (a couple of metres from a window) | Keep central tank filled; water substrate when top inch is dry, approximately every 7-10 days | Pet-safe |
| Clustered Dunce Cap | Direct sun (at least 4-6 hours) | Weekly to fortnightly in active growth (spring–autumn); minimal in winter dormancy | Pet-safe |
| Clustered Sanicle | Low light (north window or shaded room) | Every 1–2 weeks; maintain consistent moisture, never waterlogged | Mildly toxic to pets |
| Clustered Silver Skin | Direct sun (at least 4-6 hours) | Every 2–4 weeks during autumn–early winter growth; minimal in spring; completely withheld in summer | Pet-safe |
| Clustered Specklinia | Bright indirect light (just back from a sunny window) | Every 2-3 days; keep medium consistently moist | Pet-safe |
| Coarctata Haworthia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Coast Rock Cress | Direct sun (at least 4-6 hours) | Weekly in the growing season; reduce to monthly or less when summer-dormant | Pet-safe |
| Coastal Doghobble | Medium indirect light (a couple of metres from a window) | Every 5–7 days; regular deep watering essential in dry periods | Toxic to pets |
| Coastal Leucothoe | Medium indirect light (a couple of metres from a window) | Regular; keep evenly moist | Toxic to pets |
| Cob Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; virtually none in winter | Pet-safe |
| Cobweb Houseleek | Direct sun (at least 4-6 hours) | When soil is fully dry, every 10-14 days in growth; sparingly in winter | Pet-safe |
| Cobweb Spiderwort | Bright indirect light (just back from a sunny window) | Every 4–6 days in summer; every 10–14 days in winter | Mildly toxic to pets |
| Cochinchina Lady Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; every 10–14 days in winter | Pet-safe |
| Cockscomb | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-6 days in summer | Pet-safe |
| Coconut Palm | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in heat, never letting it dry out fully | Pet-safe |
| Cocoon Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during active growth (spring and autumn); once a month in summer and winter | Toxic to pets |
| Codonatanthus 'Sunset' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Mildly toxic to pets |
| Coin-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; reduce to every 2–3 weeks in winter | Pet-safe |
| Cole's Prostrate Hemlock | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks; do not allow soil to dry out | Pet-safe |
| Collins' Heliconia | Bright indirect light (just back from a sunny window) | Every 2–3 days in summer, weekly in cooler months | Mildly toxic to pets |
| Colocasia 'Coffee Cups' | Direct sun (at least 4-6 hours) | Keep constantly wet; never let it dry out | Toxic to pets |
| Colocasia 'Illustris' (Imperial Taro) | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet; check every 2-4 days in active growth | Toxic to pets |
| Colocasia Black Coral | Direct sun (at least 4-6 hours) | Keep soil constantly moist; water every 2-4 days, daily in peak summer | Toxic to pets |
| Colocasia Blue Hawaii | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer heat | Toxic to pets |
| Colocasia Crown of Tonga | Direct sun (at least 4-6 hours) | Keep constantly moist to boggy; check every 1-3 days in heat, never letting it dry out | Toxic to pets |
| Colocasia Elena | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer | Toxic to pets |
| Colocasia Fontanesii | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; check every 2-4 days, never let it dry out | Toxic to pets |
| Colocasia Gigantea | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-3 days, daily in summer heat | Toxic to pets |
| Colocasia Hilo Beauty | Bright indirect light (just back from a sunny window) | Keep evenly moist to wet; check every 2-4 days, watering before the surface fully dries | Toxic to pets |
| Colocasia Nancy's Revenge | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer | Toxic to pets |
| Colocasia Pharaoh's Mask | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer heat | Toxic to pets |
| Colocasia Puckered Up | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer heat | Toxic to pets |
| Colocasia Tea Cup | Direct sun (at least 4-6 hours) | Keep soil constantly moist; water every 2-4 days, daily in summer | Toxic to pets |
| Colombian Zamia | Bright indirect light (just back from a sunny window) | Every 10–21 days; reduce in winter when cold | Toxic to pets |
| Colorado Blue Spruce | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; regular deep watering in first 2–3 years | Mildly toxic to pets |
| Coloratus Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Column Aubrieta | Direct sun (at least 4-6 hours) | Weekly during spring growth; very sparingly in summer | Pet-safe |
| Column Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; once a month or less in winter | Mildly toxic to pets |
| Columnae Snow-in-Summer | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Columnar Douglas Fir | Direct sun (at least 4-6 hours) | Moderate during establishment; reduced once established | Pet-safe |
| Columnar English Oak | Direct sun (at least 4-6 hours) | Regular deep watering in the first 3-5 years; established trees are largely drought-tolerant | Mildly toxic to pets |
| Comb Cycad | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–5 weeks in autumn and winter | Toxic to pets |
| Comb Speedwell | Direct sun (at least 4-6 hours) | Every 2–3 weeks; very drought-tolerant | Pet-safe |
| Common Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (soil should be consistently moist but not waterlogged) | Toxic to pets |
| Common Bamboo | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week; daily in hot or dry conditions | Pet-safe |
| Common Bird's-foot Trefoil | Direct sun (at least 4-6 hours) | Low once established | Mildly toxic to pets |
| Common blue violet | Medium indirect light (a couple of metres from a window) | Every 5–10 days; tolerates wet soil | Pet-safe |
| Common box | Medium indirect light (a couple of metres from a window) | Weekly during establishment; monthly once established in the ground | Toxic to pets |
| Common Broom | Direct sun (at least 4-6 hours) | sparingly after establishment | Toxic to pets |
| Common Bugle | Medium indirect light (a couple of metres from a window) | Moderate; consistent moisture preferred | Mildly toxic to pets |
| Common Candelabra Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in winter growing season; withhold almost entirely in summer dormancy | Toxic to pets |
| common dogwood | Bright indirect light (just back from a sunny window) | Weekly in first season; largely self-sufficient once established | Mildly toxic to pets |
| Common Evening Primrose | Direct sun (at least 4-6 hours) | Every 10–14 days; highly tolerant of drought once established | Pet-safe |
| Common Foxglove | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water weekly in dry spells | Toxic to pets |
| Common Goldfish Plant | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry | Pet-safe |
| Common Gorse | Direct sun (at least 4-6 hours) | rarely after establishment | Toxic to pets |
| Common Heather | Direct sun (at least 4-6 hours) | Water weekly in dry spells for the first two seasons; established plants are moderately drought-tolerant | Pet-safe |
| Common hollyhock | Direct sun (at least 4-6 hours) | Weekly when established; more in heat or drought | Mildly toxic to pets |
| Common immortelle | Direct sun (at least 4-6 hours) | Every 7–10 days; allow soil to dry between waterings | Pet-safe |
| Common Jasmine | Direct sun (at least 4-6 hours) | Water regularly while establishing and in dry spells; water when the top few cm of soil dries | Pet-safe |
| Common Juniper | Direct sun (at least 4-6 hours) | Low; water deeply but infrequently once established | Mildly toxic to pets |
| Common Knapweed | Direct sun (at least 4-6 hours) | Low — water only to establish | Mildly toxic to pets |
| Common Lilac | Direct sun (at least 4-6 hours) | Deeply once a week in the first year, then only in drought | Mildly toxic to pets |
| Common Lime | Direct sun (at least 4-6 hours) | Regular in first 2–3 years; occasional once established | Pet-safe |
| Common Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–4 days; keep soil evenly moist | Pet-safe |
| Common Mallow | Direct sun (at least 4-6 hours) | Low once established | Pet-safe |
| Common manzanita | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established — water sparingly in summer | Mildly toxic to pets |
| Common Milkweed | Direct sun (at least 4-6 hours) | Moderate; weekly when establishing, drought-tolerant once established | Toxic to pets |
| Common Milkwort | Direct sun (at least 4-6 hours) | Rarely; drought-tolerant once established | Mildly toxic to pets |
| Common peony | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce after bloom | Mildly toxic to pets |
| Common Polypody | Medium indirect light (a couple of metres from a window) | Every 10–14 days; tolerates extended dry periods once established | Pet-safe |
| Common Poppy | Direct sun (at least 4-6 hours) | Low once established; water seedlings until established | Toxic to pets |
| Common Quaking Grass | Direct sun (at least 4-6 hours) | Rarely; drought-tolerant once established | Pet-safe |
| Common Rhododendron | Bright indirect light (just back from a sunny window) | Weekly during dry periods; established plants are tolerant but flower best with consistent moisture | Toxic to pets |
| Common Saltmarsh Grass | Direct sun (at least 4-6 hours) | Tidal — periodic saltwater flooding | Pet-safe |
| Common Sea Lavender | Direct sun (at least 4-6 hours) | Low to moderate — drought-tolerant once established; tolerates periodic waterlogging | Pet-safe |
| Common Snowdrop | Medium indirect light (a couple of metres from a window) | Naturally moisture-retentive soil; supplemental watering in dry spells during growth | Toxic to pets |
| Common Spike-rush | Direct sun (at least 4-6 hours) | Permanently aquatic to waterlogged; plant at 0–30 cm (0–12 in) water depth | Pet-safe |
| Common Star of Bethlehem | Direct sun (at least 4-6 hours) | Low; self-sufficient in a UK garden once established | Toxic to pets |
| Common Stork's Bill | Direct sun (at least 4-6 hours) | Naturally rain-fed; no supplemental watering needed for wild or meadow plantings | Mildly toxic to pets |
| Common teasel | Direct sun (at least 4-6 hours) | Rarely needs supplemental watering once established; water seedlings regularly | Pet-safe |
| Common Toadflax | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established; water only in the first season | Mildly toxic to pets |
| Common tobacco | Direct sun (at least 4-6 hours) | Every 3–5 days; maintain consistently moist soil | Toxic to pets |
| Common Tussock Grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; tolerates extended dry periods | Pet-safe |
| Common Witch Hazel 'Arnold Promise' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry; keep evenly moist in the first years and during droughts | Mildly toxic to pets |
| Commutatum Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Compact Alpine Fir | Direct sun (at least 4-6 hours) | Moderate; regular when establishing, low to moderate once established | Mildly toxic to pets |
| Compact Angraecum | Bright indirect light (just back from a sunny window) | Every 2–4 days in summer; every 7–14 days in winter | Pet-safe |
| Compact Gem Bosnian Pine | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Compact Plume Japanese Cedar | Bright indirect light (just back from a sunny window) | Regularly throughout the growing season; reduce slightly in winter | Pet-safe |
| Compact White Fir | Direct sun (at least 4-6 hours) | Moderate; water regularly when young; drought tolerant once established | Mildly toxic to pets |
| Comparettia falcata | Bright indirect light (just back from a sunny window) | Keep roots evenly moist, watering as they approach (but before they reach) dryness, often every 2-3 days | Mildly toxic to pets |
| Compass Plant | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | Pet-safe |
| Compressed Peperomia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks (allow compost to dry substantially between waterings) | Pet-safe |
| Compton's Gibbaeum | Direct sun (at least 4-6 hours) | Every 2–4 weeks in autumn and spring (active growth); withheld or near-dry in summer and reduced in winter | Pet-safe |
| Concrete Leaf | Direct sun (at least 4-6 hours) | Sparingly; every 1-2 weeks in active growth (autumn/spring), nearly dry in summer and winter | Mildly toxic to pets |
| Congo cockatoo impatiens | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil evenly moist | Pet-safe |
| Congo Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks (growing season); monthly or less in winter | Toxic to pets |
| Conica Jean's Dilly Spruce | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply weekly in the first two seasons, then during dry spells | Mildly toxic to pets |
| Conophytum (Living Pebbles) | Bright indirect light (just back from a sunny window) | Only when soil is bone-dry during the autumn-to-spring growth season; keep nearly dry in summer dormancy | Mildly toxic to pets |
| Conophytum Uviforme | Bright indirect light (just back from a sunny window) | Only during the cool autumn-to-spring growing season, roughly every 10-14 days when soil is dry; kept dry in summer | Mildly toxic to pets |
| Constricted Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in summer heat; every 2–3 days in cooler months | Pet-safe |
| Cook Pine | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Coontie | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Cooper's Haworthia (Pilifera) | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Copiapoa cinerea | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; little to none in winter | Pet-safe |
| Copiapoa humilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep bone-dry in winter | Pet-safe |
| Copiapoa hypogaea | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; little to none in winter | Pet-safe |
| Copiapoa krainziana | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Copper Angel Masdevallia | Medium indirect light (a couple of metres from a window) | 2–3 times per week; keep substrate slightly moist | Pet-safe |
| Copper Rain Lily | Direct sun (at least 4-6 hours) | Low to moderate; rain-triggered | Toxic to pets |
| Cora XDR vinca | Direct sun (at least 4-6 hours) | Every 4–7 days once established; water young transplants more frequently | Toxic to pets |
| Coral Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, sparingly in winter | Toxic to pets |
| Coral bells | Medium indirect light (a couple of metres from a window) | Weekly during active growth; reduce in autumn and winter | Pet-safe |
| Coral Bells 'Caramel' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, around weekly in growth; more in heat and for containers | Pet-safe |
| Coral Bells 'Obsidian' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly in growth; more in heat and for container plants | Pet-safe |
| Coral Bells 'Palace Purple' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly in growth; more in heat and for container plants | Pet-safe |
| Coral Berry Bromeliad | Bright indirect light (just back from a sunny window) | Keep central cup filled; water soil every 2–3 weeks | Pet-safe |
| Coral Cactus | Bright indirect light (just back from a sunny window) | Every 2-4 weeks; let the soil dry out almost fully between waterings | Toxic to pets |
| Coral Lily | Direct sun (at least 4-6 hours) | When top 2–3 cm of soil is dry | Toxic to pets |
| Coral Plant | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Toxic to pets |
| Cordyline australis | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Coreopsis 'Moonbeam' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly to establish, then sparingly | Pet-safe |
| Coreopsis 'Zagreb' | Direct sun (at least 4-6 hours) | Water to establish, then only in extended drought; drought-tolerant once settled | Pet-safe |
| Coreopsis grandiflora 'Early Sunrise' | Direct sun (at least 4-6 hours) | Water to establish, then only during drought; drought-tolerant once settled | Pet-safe |
| Coris-Leaved St John's Wort | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Toxic to pets |
| Cork Palm | Bright indirect light (just back from a sunny window) | Every 2–3 weeks; very sparingly in winter | Toxic to pets |
| Cork-Stemmed Passionflower | Direct sun (at least 4-6 hours) | Once or twice a week until established; less once mature | Pet-safe |
| Corn plant | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Corn-Leaf Pitcairnia | Medium indirect light (a couple of metres from a window) | every 5–7 days in summer, every 10–14 days in winter | Pet-safe |
| Cornelia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in heat | Pet-safe |
| Cornflower | Direct sun (at least 4-6 hours) | Low to moderate — water during establishment only | Pet-safe |
| Cornish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once settled | Pet-safe |
| Cornish Heath Mrs D.F. Maxwell | Direct sun (at least 4-6 hours) | Water weekly during dry spells, especially in the first two years | Pet-safe |
| Cornus kousa 'Miss Satomi' | Direct sun (at least 4-6 hours) | Water deeply weekly while establishing; supplement in dry spells | Pet-safe |
| Corsican Heath | Direct sun (at least 4-6 hours) | Moderate; water occasionally once established | Mildly toxic to pets |
| Coryphantha macromeris | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; keep dry in winter | Pet-safe |
| Coryphantha vivipara | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; none in winter | Pet-safe |
| Cosmos | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Cosmos 'Sensation' | Direct sun (at least 4-6 hours) | Water young plants until established, then only in prolonged drought; drought-tolerant once rooted | Pet-safe |
| Cosmos bipinnatus 'Picotee' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cosmos bipinnatus 'Sensation White' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cosmos sulphureus 'Bright Lights' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cosmos sulphureus 'Klondike' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| Cosson's Germander | Direct sun (at least 4-6 hours) | Sparingly every 2–3 weeks in summer; minimal to none in winter | Mildly toxic to pets |
| Costa Rican Goldfish Vine | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of mix has dried; every 5–8 days in summer, every 10–14 days in winter | Pet-safe |
| Cotinus coggygria 'Golden Spirit' | Direct sun (at least 4-6 hours) | Weekly while establishing; sparingly once mature | Mildly toxic to pets |
| Cotinus coggygria 'Grace' | Direct sun (at least 4-6 hours) | Weekly while establishing; rarely thereafter once rooted | Mildly toxic to pets |
| Cotinus obovatus | Direct sun (at least 4-6 hours) | Weekly during establishment; very rarely once mature | Mildly toxic to pets |
| Cotoneaster Bonsai | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil is dry, roughly every 1-3 days in summer | Mildly toxic to pets |
| Cotoneaster microphyllus | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil is dry, roughly every 1-3 days in summer | Mildly toxic to pets |
| Cotton Candy Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Cottontop Cactus | Direct sun (at least 4-6 hours) | Every 3–5 weeks in summer; completely dry in winter | Mildly toxic to pets |
| Cotyledon Eliseae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Cotyledon Orbiculata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Cotyledon Papillaris | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Cow Parsley | Medium indirect light (a couple of metres from a window) | Moderate; water during dry spells in the first season | Mildly toxic to pets |
| Crabapple 'Evereste' | Direct sun (at least 4-6 hours) | Weekly during establishment and dry spells | Toxic to pets |
| Crabapple 'Hanagasa' | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, frequently daily in summer and less in dormancy | Toxic to pets |
| Crabapple 'John Downie' | Direct sun (at least 4-6 hours) | Weekly while young and in summer drought | Toxic to pets |
| Crabapple Bonsai | Direct sun (at least 4-6 hours) | When the surface soil starts to dry, often once or twice daily in summer | Toxic to pets |
| Cramer's Amazon celosia | Direct sun (at least 4-6 hours) | Every 3–5 days | Pet-safe |
| Crane's Bill Stork's Bill | Direct sun (at least 4-6 hours) | Water lightly; allow the soil surface to dry between waterings | Mildly toxic to pets |
| Crape Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days during growing season; reduce in winter | Toxic to pets |
| Crassula Alstonii | Direct sun (at least 4-6 hours) | Sparingly, roughly every 2-3 weeks in active growth and barely at all in dormancy | Toxic to pets |
| Crassula Capitella | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crassula Columnaris | Direct sun (at least 4-6 hours) | Sparingly, roughly every 2-3 weeks in active growth and almost none during summer dormancy | Toxic to pets |
| Crassula Falcata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, monthly or less in winter | Toxic to pets |
| Crassula Hemisphaerica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is fully dry, roughly every 10-14 days in growth; less in summer rest | Toxic to pets |
| Crassula Hummel's Sunset | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crassula Marnieriana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 3-4 weeks in winter | Toxic to pets |
| Crassula Nudicaulis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Crassula Pyramidalis | Bright indirect light (just back from a sunny window) | Sparingly, only when soil is bone dry, roughly every 2-3 weeks in growth; nearly dry over summer rest | Toxic to pets |
| Crassula Rupestris | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in summer; very sparingly in winter | Toxic to pets |
| Crassula Setulosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Crassula Socialis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 3-4 weeks in winter | Toxic to pets |
| Crassula Tetragona | Direct sun (at least 4-6 hours) | When soil is dry, about every 7-12 days in summer; sparingly in winter | Toxic to pets |
| Crassula Undulata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crataegus laevigata 'Paul's Scarlet' | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are very drought-tolerant | Pet-safe |
| Crataegus persimilis 'Prunifolia' | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are drought-tolerant | Pet-safe |
| Crazy-leaf Begonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; every 10–14 days in winter | Toxic to pets |
| Cream Wild Indigo | Direct sun (at least 4-6 hours) | Low; water weekly in first season only | Toxic to pets |
| Creeping Baby's Breath | Direct sun (at least 4-6 hours) | Once per week in dry spells; very little in winter | Mildly toxic to pets |
| Creeping broad-leaf sedge | Medium indirect light (a couple of metres from a window) | Keep evenly and consistently moist; never allow to dry out | Pet-safe |
| Creeping Coin Peperomia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14–21 days in winter | Pet-safe |
| Creeping Comfrey | Low light (north window or shaded room) | Every 7–14 days; largely self-sufficient once established | Mildly toxic to pets |
| Creeping fig | Bright indirect light (just back from a sunny window) | When the top 1cm (half-inch) of compost dries | Toxic to pets |
| Creeping Globe Daisy | Direct sun (at least 4-6 hours) | Every 2–3 weeks when actively growing; minimal in winter | Pet-safe |
| Creeping Globularia | Direct sun (at least 4-6 hours) | Every 14 days during active growth; virtually none in winter. | Mildly toxic to pets |
| Creeping Juniper | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly during the first growing season | Mildly toxic to pets |
| Creeping Little Bluestem | Direct sun (at least 4-6 hours) | Minimal once established; rainfall usually sufficient on native sites | Pet-safe |
| Creeping Mazus | Bright indirect light (just back from a sunny window) | Every 3–5 days; prefers consistently moist soil | Mildly toxic to pets |
| Creeping Phlox | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2 weeks once established | Mildly toxic to pets |
| Creeping Speedwell | Bright indirect light (just back from a sunny window) | Moderate; water when the top 2–3 cm of soil begins to dry | Pet-safe |
| Creeping Woodland Phlox | Medium indirect light (a couple of metres from a window) | Weekly; maintain consistent moisture | Mildly toxic to pets |
| Crescent-Leaved Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–4 days during active growth; reduce to every 5–6 days in winter | Pet-safe |
| Crested Bracken | Medium indirect light (a couple of metres from a window) | every 1-2 weeks once established | Toxic to pets |
| Crested Christmas Fern | Low light (north window or shaded room) | Every 7–10 days; allow top 2–3 cm to dry between waterings | Pet-safe |
| Crested Euphorbia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Crested Gentian | Direct sun (at least 4-6 hours) | Regular; keep soil consistently moist during the growing season | Mildly toxic to pets |
| Crested Hart's Tongue Fern | Medium indirect light (a couple of metres from a window) | Weekly in the growing season, every 2–3 weeks in winter | Pet-safe |
| Crested Iris | Medium indirect light (a couple of metres from a window) | Moderate — keep evenly moist | Toxic to pets |
| Crested Phlomis | Direct sun (at least 4-6 hours) | Once every 2–3 weeks in summer, barely at all in winter | Mildly toxic to pets |
| Cretan Arum | Direct sun (at least 4-6 hours) | Moderate during autumn–spring active growth; completely dry in summer | Toxic to pets |
| Cretan Date Palm | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Crimean Linden | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2–3 weeks in dry summers once mature | Pet-safe |
| Crimson and Gold quince | Bright indirect light (just back from a sunny window) | Weekly when newly planted; established plants largely rain-fed in temperate climates | Mildly toxic to pets |
| Crimson Cestrum | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in winter | Toxic to pets |
| Crimson Portea | Bright indirect light (just back from a sunny window) | Weekly in growth; every 10–14 days in winter | Pet-safe |
| Crimson-Spot Rock Rose | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; weekly in the first growing season | Mildly toxic to pets |
| Crispum Hart's Tongue Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days; keep evenly moist | Pet-safe |
| Crocosmia × crocosmiiflora 'Emily McKenzie' | Direct sun (at least 4-6 hours) | Weekly during growth and flowering in dry weather; ease off as foliage dies back | Mildly toxic to pets |
| Crocosmia × crocosmiiflora 'Jackanapes' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; water through dry spells in the growing season | Mildly toxic to pets |
| Crocosmia × crocosmiiflora 'Lucifer' | Direct sun (at least 4-6 hours) | Weekly during active growth and flowering in dry spells; reduce after foliage dies back | Mildly toxic to pets |
| Crocosmia × crocosmiiflora 'Solfatare' | Direct sun (at least 4-6 hours) | Weekly during growth and flowering in dry spells; reduce as foliage dies back | Mildly toxic to pets |
| Crocosmia masoniorum | Direct sun (at least 4-6 hours) | Weekly during growth and flowering in dry weather; taper off as foliage dies back | Mildly toxic to pets |
| Crocus 'Jeanne d'Arc' | Direct sun (at least 4-6 hours) | Rely on natural rainfall; water only during a dry autumn after planting or a droughty spring | Mildly toxic to pets |
| Crocus chrysanthus 'Cream Beauty' | Direct sun (at least 4-6 hours) | Rely on rainfall; water only during a dry establishment period after planting or a droughty spring | Mildly toxic to pets |
| Crocus tommasinianus 'Ruby Giant' | Direct sun (at least 4-6 hours) | Rainfall-reliant; water only briefly during a dry autumn establishment or droughty early spring | Mildly toxic to pets |
| Cross Gentian | Bright indirect light (just back from a sunny window) | Water regularly until established; drought-tolerant thereafter | Mildly toxic to pets |
| Cross-leaved heath | Direct sun (at least 4-6 hours) | Frequently — keep soil consistently moist to wet | Pet-safe |
| Crossandra (firecracker flower) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil starts to dry, often every 4-7 days in growth | Pet-safe |
| Crossvine | Bright indirect light (just back from a sunny window) | Weekly when young; established plants are drought-tolerant | Mildly toxic to pets |
| Crosswort | Medium indirect light (a couple of metres from a window) | Low to moderate — rainfall sufficient in UK | Mildly toxic to pets |
| Crown Bamboo | Bright indirect light (just back from a sunny window) | 2-3 times per week during growing season; weekly in cooler months | Pet-safe |
| Crown Brodiaea | Direct sun (at least 4-6 hours) | Moderate during autumn-to-spring growth; completely dry from flowering through to early autumn | Mildly toxic to pets |
| Crown Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth; none from late autumn through winter | Pet-safe |
| Crown of Thorns | Direct sun (at least 4-6 hours) | Every 1-2 weeks in growth; sparingly in winter | Toxic to pets |
| Crown Staghorn Fern | Bright indirect light (just back from a sunny window) | Twice weekly in the growing season; once every 10–14 days in cooler months | Pet-safe |
| Crown Vetch | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Crown Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Cryptanthus acaulis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Cryptanthus bromelioides | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly weekly | Pet-safe |
| Crystal Palace lobelia | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, typically every 2-3 days in summer | Toxic to pets |
| Crystal White narrowleaf zinnia | Direct sun (at least 4-6 hours) | Every 5–7 days; drought tolerant once established | Pet-safe |
| Ctenanthe Compressa | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Ctenanthe Oppenheimiana 'Tricolor' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Cuban Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Cuban Royal Palm | Direct sun (at least 4-6 hours) | Every 5–7 days when young; established trees weekly or rely on rainfall | Pet-safe |
| Cucumber Tree Magnolia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks when established; more frequently during active growth in summer | Pet-safe |
| Cunninghamia 'Glauca' | Direct sun (at least 4-6 hours) | Keep soil moist; water regularly while young, then deeply in dry spells once established | Mildly toxic to pets |
| Cup Plant | Direct sun (at least 4-6 hours) | Keep soil moist; water deeply in dry spells, every 5-7 days | Mildly toxic to pets |
| Cupani sweet pea | Direct sun (at least 4-6 hours) | Every 3–5 days in warm growing conditions; adjust for rainfall | Toxic to pets |
| Cupcake Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Cupcakes Blush cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; drought tolerant once established | Pet-safe |
| Cuphea hyssopifolia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 5-7 days | Mildly toxic to pets |
| Cupuaçu | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil starts to dry, typically every 3-6 days in growth | Mildly toxic to pets |
| Curio Articulatus | Bright indirect light (just back from a sunny window) | When the mix is dry through, roughly every 10-14 days in active growth and every 3-4 weeks while resting | Toxic to pets |
| Curio Citriformis | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, about every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Ficoides | Direct sun (at least 4-6 hours) | Water deeply only when the soil is fully dry, roughly every 2-3 weeks in summer and far less in winter | Toxic to pets |
| Curio Ficoides 'Mount Everest' | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in summer; sparingly in winter | Toxic to pets |
| Curio Radicans | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, about every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Rowleyanus | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Talinoides var. mandraliscae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Curiosity Plant | Direct sun (at least 4-6 hours) | When the mix is dry, about every 2-3 weeks in summer; minimal in winter | Pet-safe |
| Curly Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days during growth; every 10–14 days during winter rest | Pet-safe |
| Curly-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly during the first growing season | Mildly toxic to pets |
| Curror's Cyphostemma | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; once every 6–8 weeks or less in winter | Toxic to pets |
| Curved Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to dry between waterings) | Pet-safe |
| Cushion Baby's Breath | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; very sparingly or not at all in winter | Mildly toxic to pets |
| Cushion Draba | Direct sun (at least 4-6 hours) | Sparingly; soil must dry between waterings | Pet-safe |
| Cushion Thrift | Direct sun (at least 4-6 hours) | Very low — drought-tolerant once established | Mildly toxic to pets |
| Cusp Blazing Star | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established; avoid irrigation in winter | Pet-safe |
| Custard Apple | Direct sun (at least 4-6 hours) | Twice weekly when establishing; weekly once mature, reducing in dry dormancy | Mildly toxic to pets |
| Custard Biriba | Direct sun (at least 4-6 hours) | 2–3 times per week in growing season; reduce in cooler months | Pet-safe |
| Cutleaf coneflower | Direct sun (at least 4-6 hours) | Twice weekly during establishment; weekly or more in dry spells once established | Pet-safe |
| Cutleaf Fleabane | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; very little in winter | Pet-safe |
| Cutleaf Toothwort | Medium indirect light (a couple of metres from a window) | Moderate during the active growth period (March–May); none needed once dormant in summer. | Pet-safe |
| Cycas Panzhihuaensis | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm of soil is dry, roughly every 1-2 weeks in growth | Toxic to pets |
| Cycas Rumphii | Bright indirect light (just back from a sunny window) | Water when the top 3-5 cm of soil is dry, roughly every 1-2 weeks | Toxic to pets |
| Cyclamen-flowered Daffodil | Bright indirect light (just back from a sunny window) | Regular during autumn to late spring; dry summer dormancy | Toxic to pets |
| Cylindric Blazing Star | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; regular watering during establishment | Pet-safe |
| Cylindrical Snake Plant | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring and summer; roughly monthly in winter | Toxic to pets |
| Cymbidium 'Red Beauty' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in winter | Pet-safe |
| Cymbidium 'Sarah Jean' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, about every 5-7 days, drier in winter | Pet-safe |
| Cymbidium 'Showgirl' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in winter | Pet-safe |
| Cymbidium devonianum | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; reduce to every 10-14 days in winter | Pet-safe |
| Cymbidium erythrostylum | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; every 10-14 days in winter | Pet-safe |
| Cymbidium Golden Elf 'Sundust' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in cooler months | Pet-safe |
| Cyperus Sedge | Bright indirect light (just back from a sunny window) | Permanently wet; shallow water up to 15 cm deep | Pet-safe |
| Cyprus Cedar | Direct sun (at least 4-6 hours) | Every 10-14 days when young; established trees rely mostly on rainfall | Mildly toxic to pets |
| Cyprus Cedar | Direct sun (at least 4-6 hours) | Infrequently; drought-tolerant once established | Mildly toxic to pets |
| Cystopteris bulbifera | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water when the surface begins to dry, roughly every 3-6 days in growth | Mildly toxic to pets |
| Daghestan Sage | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Dahlia 'Bishop of Llandaff' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week in active growth; keep evenly moist | Mildly toxic to pets |
| Dahurian Juniper | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; more frequent in the first season | Mildly toxic to pets |
| Dahurian Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; minimal once established | Pet-safe |
| Dalit Durian | Direct sun (at least 4-6 hours) | Daily to every other day in dry spells; less frequent during rainy seasons | Pet-safe |
| Dalmatian Cranesbill | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; minimal in winter | Pet-safe |
| Dalstroem's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Daily misting or watering; roots must remain continuously moist but never waterlogged | Pet-safe |
| Danica Globe Arborvitae | Bright indirect light (just back from a sunny window) | Moderate — keep soil evenly moist, especially in heat | Pet-safe |
| Daphne laureola | Low light (north window or shaded room) | Weekly while establishing; rarely once established | Toxic to pets |
| Daphne mezereum | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist, never waterlogged | Toxic to pets |
| Daphne odora | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist, never soggy | Toxic to pets |
| Daphne odora 'Aureomarginata' | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist but never wet | Toxic to pets |
| Darcy's Sage | Direct sun (at least 4-6 hours) | Regular to moderate — allow soil surface to dry between waterings | Mildly toxic to pets |
| Dark Beauty heather | Direct sun (at least 4-6 hours) | Weekly during the first season; as needed once established | Pet-safe |
| dark form scindapsus | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 10–14 days in winter | Toxic to pets |
| Dark Green Ceratozamia | Medium indirect light (a couple of metres from a window) | Weekly in summer; every 2–3 weeks in winter | Toxic to pets |
| Dark Velvet Kohleria | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; every 10–14 days in winter | Pet-safe |
| Darley Dale heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Darley Dale Heath Furzey | Direct sun (at least 4-6 hours) | Water weekly in dry spells; reduce in winter unless the soil is very dry | Pet-safe |
| Darwin's barberry | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; drought-tolerant once established | Mildly toxic to pets |
| David viburnum | Bright indirect light (just back from a sunny window) | Once or twice weekly when establishing; monthly once mature | Mildly toxic to pets |
| Davidia involucrata | Bright indirect light (just back from a sunny window) | Weekly in dry spells, especially the first few years | Mildly toxic to pets |
| Dawn Redwood Bonsai | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil starts to dry, often daily or twice daily in summer | Mildly toxic to pets |
| Dawn viburnum | Bright indirect light (just back from a sunny window) | Weekly in the first two seasons; every 2–3 weeks once established | Mildly toxic to pets |
| Daylily | Direct sun (at least 4-6 hours) | Weekly; keep moist in the first season | Toxic to pets |
| Dazzler cosmos | Direct sun (at least 4-6 hours) | Weekly until established; every 10–14 days once established | Pet-safe |
| Debbie Graptoveria | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Deciduous Azalea 'Gibraltar' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply 1-2 times weekly through summer, more in heat | Toxic to pets |
| Deer Grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; monthly or less in cool months | Pet-safe |
| Degroot's Spire Arborvitae | Direct sun (at least 4-6 hours) | Two to three times weekly while young; weekly once established | Mildly toxic to pets |
| Delta Pure White pansy | Bright indirect light (just back from a sunny window) | Every 2–3 days in warm weather; weekly in cool, wet conditions | Pet-safe |
| Dendrobium phalaenopsis | Bright indirect light (just back from a sunny window) | When the mix is approaching dry, roughly every 5-7 days in growth | Pet-safe |
| Dense Trichodiadema | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn and spring flowering seasons; reduced to monthly or less in summer and winter | Pet-safe |
| Dense-flowered Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter | Toxic to pets |
| Densiformis Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, roughly weekly while establishing | Toxic to pets |
| Deodar Cedar | Direct sun (at least 4-6 hours) | Weekly during first 2 years; drought-tolerant once established | Mildly toxic to pets |
| Deodar Cedar 'Karl Fuchs' | Direct sun (at least 4-6 hours) | Every 1-2 weeks while establishing, then sparingly | Mildly toxic to pets |
| Deparia acrostichoides | Low light (north window or shaded room) | Keep evenly moist; water when the top 2 cm starts to dry, roughly every 4-7 days in growth | Pet-safe |
| Desert Bromeliad | Direct sun (at least 4-6 hours) | every 14–21 days in summer, rarely in winter | Pet-safe |
| Desert Privet Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Deutschland Astilbe | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet; water when the top 2-3 cm dries, about every 3-5 days in summer | Mildly toxic to pets |
| Deutzia gracilis | Direct sun (at least 4-6 hours) | Weekly in the first year, then during dry spells | Pet-safe |
| Deutzia scabra 'Plena' | Direct sun (at least 4-6 hours) | Weekly while establishing, then in dry spells | Pet-safe |
| Deutzia x elegantissima 'Rosealind' | Direct sun (at least 4-6 hours) | Weekly while establishing, then during droughts | Pet-safe |
| DeVoss Codonanthe | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow top 1–2 cm of medium to dry between waterings | Pet-safe |
| Deyke's Wax Plant | Medium indirect light (a couple of metres from a window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Diana Clare Pulmonaria | Low light (north window or shaded room) | Keep soil evenly moist; water every 4-6 days in dry spells, more in pots | Mildly toxic to pets |
| Diane's Gold Brunnera | Low light (north window or shaded room) | Keep soil evenly moist; water when the top 2-3 cm dries, roughly every 4-6 days in heat | Mildly toxic to pets |
| Dianthus 'Doris' | Direct sun (at least 4-6 hours) | Water when the top few cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus 'Mrs Sinkins' | Direct sun (at least 4-6 hours) | Water when the top few cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus deltoides | Direct sun (at least 4-6 hours) | Water when soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus gratianopolitanus 'Firewitch' | Direct sun (at least 4-6 hours) | Water when soil is dry; very drought-tolerant once established | Toxic to pets |
| Diapensia-Like Saxifrage | Direct sun (at least 4-6 hours) | Very low — water sparingly in spring and summer; virtually none in winter | Pet-safe |
| Diascia 'Wink Coral Pink' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Diascia barberae 'Piccadilly' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Dicliptera suberecta | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days once established | Mildly toxic to pets |
| Didissandra uniflora | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of mix begins to dry, roughly every 4-7 days | Mildly toxic to pets |
| Dieffenbachia 'Compacta' | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 7-10 days in summer | Toxic to pets |
| Dieffenbachia 'Tropic Snow' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Toxic to pets |
| Dilys Cranesbill | Medium indirect light (a couple of metres from a window) | Water once a week during dry spells; largely self-sufficient once established in UK conditions | Pet-safe |
| Dimpled Trout Lily | Medium indirect light (a couple of metres from a window) | Consistently moist from emergence to dormancy (late winter to late spring) | Mildly toxic to pets |
| Dinnerplate Dahlia 'Café au Lait' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week in active growth once sprouted; keep evenly moist | Mildly toxic to pets |
| Dinter's Eye Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through late winter; none in summer | Pet-safe |
| Dinteranthus puberulus | Direct sun (at least 4-6 hours) | Lightly in late-summer to autumn growth; near-dry the rest of the year | Pet-safe |
| Dioon mejiae | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Dioscorides' Arum | Bright indirect light (just back from a sunny window) | Moderate during active growth (autumn–spring); dry off completely in summer | Toxic to pets |
| Dipladenia | Direct sun (at least 4-6 hours) | Once or twice weekly in summer; every 10–14 days in winter | Mildly toxic to pets |
| Dischidia major | Bright indirect light (just back from a sunny window) | When the medium nears dry, roughly every 5-7 days | Mildly toxic to pets |
| Dischidia platyphylla | Bright indirect light (just back from a sunny window) | When the medium is mostly dry, roughly every 5-7 days | Mildly toxic to pets |
| Dischidia ruscifolia 'Variegata' | Bright indirect light (just back from a sunny window) | When the top of the medium is just dry, roughly every 5-7 days | Mildly toxic to pets |
| Disk Staghorn Fern | Bright indirect light (just back from a sunny window) | Soak when the root mass is dry, roughly every 10-14 days | Pet-safe |
| Dog Rose | Direct sun (at least 4-6 hours) | Weekly during the first growing season; rarely once established | Pet-safe |
| Dogwood | Medium indirect light (a couple of metres from a window) | Low to moderate — water during establishment; drought-tolerant thereafter | Mildly toxic to pets |
| Dogwood 'Eddie's White Wonder' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply in dry spells | Mildly toxic to pets |
| Dorothy's Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water only when the new leaf pair is actively growing (late summer to autumn); completely dry at all other times | Pet-safe |
| Dotted Blazing Star | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; moderate during first season | Pet-safe |
| Dotted Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Double Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (keep soil consistently moist) | Toxic to pets |
| Double Click Snow Puff cosmos | Direct sun (at least 4-6 hours) | Weekly once established; more frequent in heat | Pet-safe |
| Double Knock Out Rose | Direct sun (at least 4-6 hours) | About 2.5 cm weekly, deep watering | Pet-safe |
| Double Pink Oleander | Direct sun (at least 4-6 hours) | Water weekly when establishing; drought-tolerant once established | Toxic to pets |
| Double Pinwheel Flower | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce in winter | Toxic to pets |
| doublefile viburnum | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Mildly toxic to pets |
| Doublefile Viburnum 'Mariesii' | Direct sun (at least 4-6 hours) | Deep soak when the top 5 cm of soil dries, roughly weekly in the first two seasons | Pet-safe |
| Douglas Fir | Direct sun (at least 4-6 hours) | Regular during first 3 years; established trees tolerate moderate drought in cool climates | Mildly toxic to pets |
| Douglas Phlox | Direct sun (at least 4-6 hours) | Weekly when establishing; twice monthly once established | Mildly toxic to pets |
| Dove Masdevallia | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; the root zone must remain continuously moist | Pet-safe |
| Dove's-Foot Cranesbill | Direct sun (at least 4-6 hours) | Low; water only during extended drought | Pet-safe |
| Downy Oak | Direct sun (at least 4-6 hours) | Rarely once established; weekly in first 1–2 years | Mildly toxic to pets |
| Downy Painted Cup | Direct sun (at least 4-6 hours) | Infrequently, once established | Mildly toxic to pets |
| Downy Phlox | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2-3 weeks when established | Mildly toxic to pets |
| Downy Sage | Direct sun (at least 4-6 hours) | Moderate; water when the top 5 cm of soil is dry | Mildly toxic to pets |
| Downy Wax Plant | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; every 14-21 days in autumn and winter | Pet-safe |
| Downy Yellow Violet | Medium indirect light (a couple of metres from a window) | Regular; keep evenly moist | Pet-safe |
| Dracaena | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Dracaena 'Janet Craig' | Bright indirect light (just back from a sunny window) | Every 10-14 days; when the top third of the soil is dry | Toxic to pets |
| Dracaena Aletriformis | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Arborea | Bright indirect light (just back from a sunny window) | When top 4-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Aubryana | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Bicolor | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Braunii | Medium indirect light (a couple of metres from a window) | Soil: when top 2-3 cm is dry, every 7-10 days. Water culture: top up weekly, full change every 2-3 weeks | Toxic to pets |
| Dracaena Cinnabari | Direct sun (at least 4-6 hours) | When soil is largely dry, roughly every 2-3 weeks | Toxic to pets |
| Dracaena Compacta | Medium indirect light (a couple of metres from a window) | When top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Deremensis Janet Craig | Low light (north window or shaded room) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Draco | Direct sun (at least 4-6 hours) | When the soil is mostly dry, roughly every 14-21 days | Toxic to pets |
| Dracaena Ellenbeckiana | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Dracaena Hookeriana | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, every 10-14 days | Toxic to pets |
| Dracaena Marginata Bicolor | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Reflexa | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 1-2 weeks | Toxic to pets |
| Dracaena Reflexa Song of Jamaica | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 1-2 weeks | Toxic to pets |
| Dracaena Sanderiana Variegata | Bright indirect light (just back from a sunny window) | Soil: when top 2-3 cm is dry, every 7-10 days. Water culture: top up weekly, full change every 2-3 weeks | Toxic to pets |
| Dracaena Trifasciata Mikado | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Dracaena Umbraculifera | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Volkensii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracula bella | Low light (north window or shaded room) | Keep continuously moist, watering every 2-3 days so the medium never dries fully | Mildly toxic to pets |
| Dracula simia | Low light (north window or shaded room) | Keep continuously moist, watering every 2-3 days so the medium never dries out | Mildly toxic to pets |
| Dracula sodiroi | Low light (north window or shaded room) | Keep evenly moist at all times, watering about every 2-4 days; the medium should never fully dry | Mildly toxic to pets |
| Dracula vampira | Low light (north window or shaded room) | Keep the medium evenly moist at all times; water roughly every 2-4 days, never allowing it to dry out | Mildly toxic to pets |
| Dragon Heart Cranesbill | Bright indirect light (just back from a sunny window) | Moderate; water during dry spells | Mildly toxic to pets |
| Dragon tree | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Dragon Tree Colorama | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dragon-Head Bamboo | Medium indirect light (a couple of metres from a window) | Twice weekly during the growing season; weekly in cool, wet periods | Pet-safe |
| Dragon-Shield Begonia | Bright indirect light (just back from a sunny window) | Every 10–14 days; allow partial drying between waterings | Toxic to pets |
| Dragon's Blood Stonecrop | Direct sun (at least 4-6 hours) | When soil is dry, about every 10-14 days in summer; minimal in winter | Pet-safe |
| Drakensberg Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; minimal in winter | Toxic to pets |
| Dressler's Zamia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to partially dry) | Toxic to pets |
| Drooping Leucothoe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; weekly in dry spells | Toxic to pets |
| Dropwort | Direct sun (at least 4-6 hours) | Infrequent; drought-tolerant once established | Mildly toxic to pets |
| Druce's Cranesbill | Bright indirect light (just back from a sunny window) | Water during establishment; once established largely drought-tolerant | Pet-safe |
| Drymonia serrulata | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Dryopteris affinis 'Cristata' | Low light (north window or shaded room) | Keep soil consistently moist; water deeply during dry spells, roughly weekly in summer | Pet-safe |
| Dryopteris championii | Low light (north window or shaded room) | Keep evenly moist; water deeply in dry spells, roughly weekly in summer heat | Pet-safe |
| Dryopteris dilatata | Medium indirect light (a couple of metres from a window) | Keep soil moist, watering when the top 2-3 cm dries, roughly every 5-7 days; established plants tolerate short dry spells | Mildly toxic to pets |
| Dryopteris filix-mas 'Linearis Polydactyla' | Low light (north window or shaded room) | Keep soil consistently moist; water during dry spells so it never dries out | Mildly toxic to pets |
| Dryopteris goldiana | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Dryopteris tokyoensis | Low light (north window or shaded room) | Keep constantly moist to wet; never allow to dry out, watering as often as needed in summer | Pet-safe |
| Durat's Air Plant | Bright indirect light (just back from a sunny window) | Mist thoroughly 2–3 times per week; a 20-minute soak once a week is sufficient in summer. Reduce to every 10–14 days in winter. | Pet-safe |
| Durian | Direct sun (at least 4-6 hours) | Frequent deep watering; keep soil moist with a brief drier spell to trigger flowering | Mildly toxic to pets |
| Dusky Coral Pea | Direct sun (at least 4-6 hours) | Low once established; moderate during establishment | Mildly toxic to pets |
| Dusty zenobia | Bright indirect light (just back from a sunny window) | Consistently moist — water deeply and regularly, especially in summer heat | Toxic to pets |
| Dutchman's pipe | Bright indirect light (just back from a sunny window) | Every 5–7 days during the growing season; less in cool dormancy. | Toxic to pets |
| Duvalia caespitosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Duvalia corderoyi | Bright indirect light (just back from a sunny window) | When soil is completely dry, about every 10-14 days in summer; keep dry in winter | Mildly toxic to pets |
| Duvalia polita | Bright indirect light (just back from a sunny window) | When soil is fully dry, around every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Dwarf Alberta Spruce | Direct sun (at least 4-6 hours) | Every 5-7 days when establishing; deep soak when the top few cm of soil dry out | Pet-safe |
| Dwarf Arolla Pine | Direct sun (at least 4-6 hours) | Low to moderate; water weekly when establishing, then drought-tolerant | Mildly toxic to pets |
| Dwarf Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer, reduce in winter | Pet-safe |
| Dwarf Black Spruce | Direct sun (at least 4-6 hours) | Weekly in summer, every 2–3 weeks in winter | Mildly toxic to pets |
| Dwarf blue rhododendron | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; sparingly in winter | Toxic to pets |
| Dwarf Blue Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days when young; deep, infrequent watering once established | Pet-safe |
| Dwarf Cape Primrose | Bright indirect light (just back from a sunny window) | every 5–8 days in the growing season, every 10–14 days in winter | Pet-safe |
| Dwarf Caribbean gesneria | Bright indirect light (just back from a sunny window) | Every 4–7 days; do not allow to dry out | Pet-safe |
| Dwarf Cavendish Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil is dry, often every 2-4 days in active growth | Pet-safe |
| Dwarf Cedar of Lebanon | Direct sun (at least 4-6 hours) | Weekly when young; bi-weekly once established | Pet-safe |
| Dwarf Chinese Juniper | Direct sun (at least 4-6 hours) | Low to moderate — water young plants regularly; drought-tolerant once established | Mildly toxic to pets |
| Dwarf Common Juniper | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Dwarf Creeping Juniper | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Dwarf Cycad | Bright indirect light (just back from a sunny window) | Every 2–4 weeks | Toxic to pets |
| Dwarf Eastern White Pine | Direct sun (at least 4-6 hours) | Regular; keep soil evenly moist, especially in the first 2–3 years | Mildly toxic to pets |
| Dwarf Fan Palm | Bright indirect light (just back from a sunny window) | Every 7–10 days during growing season; reduce to fortnightly in cooler months | Pet-safe |
| Dwarf Fernleaf Bamboo | Medium indirect light (a couple of metres from a window) | Once or twice per week during the growing season; reduce significantly in winter | Pet-safe |
| Dwarf Golden Oriental Arborvitae | Direct sun (at least 4-6 hours) | Moderate — weekly when young, reduced once established | Toxic to pets |
| Dwarf Greenstripe Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer, once per week in winter | Pet-safe |
| Dwarf Indigo Bush | Direct sun (at least 4-6 hours) | Establish with occasional deep watering for the first season; essentially no supplemental water needed once the taproot is developed | Pet-safe |
| Dwarf Jamaican Heliconia | Direct sun (at least 4-6 hours) | Every 2–3 days in growth, weekly in winter | Mildly toxic to pets |
| Dwarf Japanese Black Pine | Direct sun (at least 4-6 hours) | Moderate when young; drought-tolerant once established | Mildly toxic to pets |
| Dwarf Japanese White Pine | Direct sun (at least 4-6 hours) | Low once established; water weekly when young | Mildly toxic to pets |
| Dwarf Japanese Yew | Medium indirect light (a couple of metres from a window) | Moderate — drought-tolerant once established | Toxic to pets |
| Dwarf Korean Lilac | Direct sun (at least 4-6 hours) | Weekly while establishing, then every 1-2 weeks in dry spells | Pet-safe |
| Dwarf Lady's Mantle | Bright indirect light (just back from a sunny window) | Weekly during the growing season; established plants tolerate some drought | Pet-safe |
| Dwarf Lewisia | Direct sun (at least 4-6 hours) | Moderate during spring growth; completely dry in summer | Pet-safe |
| Dwarf Mountain Laurel Elf | Bright indirect light (just back from a sunny window) | Regular; maintain even moisture | Toxic to pets |
| Dwarf Oriental Spruce | Direct sun (at least 4-6 hours) | Every 7–10 days in the growing season; reduce to monthly in winter | Mildly toxic to pets |
| Dwarf Palmetto | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in growth | Mildly toxic to pets |
| Dwarf Pampas Grass | Direct sun (at least 4-6 hours) | Moderate; drought-tolerant once established | Mildly toxic to pets |
| Dwarf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Dwarf Snowberry | Bright indirect light (just back from a sunny window) | Regularly, keeping soil consistently moist | Toxic to pets |
| Dwarf Sugar Palm | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Dwarf Tongue Plant | Direct sun (at least 4-6 hours) | Every 3–4 weeks during the growing season; once a month or less in winter | Pet-safe |
| Dwarf Umbrella Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dwarf Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; every 3–4 days in winter | Pet-safe |
| Dwarf White Cedar | Direct sun (at least 4-6 hours) | Regular to frequent; tolerates wet soils and does not require drought management | Mildly toxic to pets |
| Dwarf Windmill Palm | Direct sun (at least 4-6 hours) | Weekly while establishing; little supplemental water once mature | Pet-safe |
| Dyckia 'Cherry Cola' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, sparingly in winter | Pet-safe |
| Dyckia brevifolia | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Dyckia fosteriana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growth, rarely in winter | Pet-safe |
| Dyckia leptostachya | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Dyckia marnier-lapostollei | Direct sun (at least 4-6 hours) | When the soil is bone dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Dyckia velascana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growth, minimal in winter | Pet-safe |
| Dyer's Air Plant | Medium indirect light (a couple of metres from a window) | Daily misting plus weekly soak | Pet-safe |
| Dyer's Cycad | Direct sun (at least 4-6 hours) | Every 3–6 weeks | Toxic to pets |
| Dyer's Macrozamia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in growing season; once a month or less in summer drought/winter | Toxic to pets |
| Dypsis Madagascariensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in warmth | Mildly toxic to pets |
| Eared Abutilon | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season, every 10–14 days in winter | Pet-safe |
| Eared Sage | Bright indirect light (just back from a sunny window) | Weekly in summer, less in winter | Pet-safe |
| Eared Strobilanthes | Bright indirect light (just back from a sunny window) | 2–3 times weekly in summer; weekly in winter | Mildly toxic to pets |
| Early Goldenrod | Direct sun (at least 4-6 hours) | Low to moderate — drought-tolerant once established | Pet-safe |
| East Himalayan Fir | Direct sun (at least 4-6 hours) | Regularly during establishment; drought-tolerant once mature | Pet-safe |
| Easter Lily Cactus | Direct sun (at least 4-6 hours) | When the top of the soil dries, roughly weekly to fortnightly in summer; keep almost dry in winter | Pet-safe |
| Eastern Cape Blue Cycad | Direct sun (at least 4-6 hours) | Every 3–6 weeks in summer; once a month or less in winter | Toxic to pets |
| Eastern Cape Cycad | Direct sun (at least 4-6 hours) | Every 21–30 days; extremely drought-tolerant | Toxic to pets |
| Eastern Cape Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks; less in winter | Toxic to pets |
| Eastern Everlasting | Direct sun (at least 4-6 hours) | Low — water only when the top 2 cm of soil is dry; drought-tolerant once established | Mildly toxic to pets |
| Eastern Hemlock | Medium indirect light (a couple of metres from a window) | Weekly during establishment; regular moisture required long-term | Pet-safe |
| Eastern Red Cedar | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established; water young transplants for 1–2 seasons | Mildly toxic to pets |
| Eastern Red Columbine | Medium indirect light (a couple of metres from a window) | Water when the top 3-5 cm of soil dries, roughly weekly | Mildly toxic to pets |
| Eastern Skunk Cabbage | Low light (north window or shaded room) | Continuously waterlogged; tolerates standing water | Toxic to pets |
| Eaton's Firecracker | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; minimal winter irrigation | Pet-safe |
| Ebracteola montis-moltkei | Direct sun (at least 4-6 hours) | Only when soil is fully dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Echeveria | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer | Pet-safe |
| Echeveria 'Afterglow' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria 'Blue Atoll' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Chroma' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and much less in winter | Pet-safe |
| Echeveria 'Cubic Frost' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Dondo' | Direct sun (at least 4-6 hours) | When the soil is fully dry, around every 10-14 days in summer, sparingly in winter | Pet-safe |
| Echeveria 'Duchess of Nürnberg' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Ice Green' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Echeveria 'Lola' | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in the growing season; much less in winter | Pet-safe |
| Echeveria 'Lola' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Echeveria 'Meridian' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Echeveria 'Minima' | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 1-2 weeks in summer | Pet-safe |
| Echeveria 'Mira' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and rarely in winter | Pet-safe |
| Echeveria 'Neon Breakers' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria 'Orion' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Echeveria 'Perle d'Azur' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, much less in winter | Pet-safe |
| Echeveria 'Perle von Nurnberg' | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth; less in winter | Pet-safe |
| Echeveria 'Perle von Nürnberg' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Raindrops' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Tarantula' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, much less in winter | Pet-safe |
| Echeveria 'Violet Queen' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria agavoides | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria agavoides 'Ebony' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria colorata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria gibbiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria harmsii | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria lilacina | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Pet-safe |
| Echeveria pallida | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and much less in winter | Pet-safe |
| Echeveria pulidonis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria setosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria shaviana | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria strictiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, sparingly in winter | Pet-safe |
| Echeveria subsessilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and monthly in winter | Pet-safe |
| Echinacea 'Cheyenne Spirit' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly while establishing, then mainly in drought | Pet-safe |
| Echinacea 'Magnus' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Pet-safe |
| Echinacea 'White Swan' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Pet-safe |
| Echinocereus coccineus | Direct sun (at least 4-6 hours) | When soil is bone-dry in growth, roughly every 10-14 days; none over winter | Pet-safe |
| Echinocereus engelmannii | Direct sun (at least 4-6 hours) | When soil is fully dry in growing season, about every 10-14 days; keep dry in winter | Pet-safe |
| Echinocereus pectinatus | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Echinops bannaticus 'Taplow Blue' | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water new plants until settled | Pet-safe |
| Echinops ritro | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water new plants until rooted | Pet-safe |
| Echinops ritro 'Veitch's Blue' | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water young plants until rooted | Pet-safe |
| Echinopsis huascha | Direct sun (at least 4-6 hours) | Soak-and-dry; roughly every 10-14 days in active growth, none in winter | Pet-safe |
| Ecuador Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (consistent moisture essential) | Toxic to pets |
| Edelweiss | Direct sun (at least 4-6 hours) | Every 2–3 weeks; reduce to almost nothing in winter | Pet-safe |
| Eden Valley bell heather | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2–3 weeks once established | Pet-safe |
| Edging lobelia | Bright indirect light (just back from a sunny window) | Every 2–3 days in warm weather; every 5–7 days in cool conditions | Toxic to pets |
| Edible Fockea | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season (spring–autumn); once a month or less in winter | Mildly toxic to pets |
| Edith's Air Plant | Direct sun (at least 4-6 hours) | Every 2–3 days by misting | Pet-safe |
| Edithcolea grandis | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 10-14 days in warm growth; keep dry below 15C | Mildly toxic to pets |
| Eitape Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Elegant clarkia | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Pet-safe |
| Elephant bush | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Elephant Ears Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–14 days in summer; reduce to once a month or less in winter | Pet-safe |
| Elephant Tree | Direct sun (at least 4-6 hours) | Once a month supplemental irrigation in summer outdoors; every 2–3 weeks for container plants in active growth; minimal in winter | Mildly toxic to pets |
| Elephant-foot Cyphostemma | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; minimal in winter dormancy | Mildly toxic to pets |
| Elephant's Foot | Bright indirect light (just back from a sunny window) | Every 10–14 days during active vine growth; none during summer dormancy | Mildly toxic to pets |
| Elijah Blue Fescue | Direct sun (at least 4-6 hours) | Every 10–14 days (established); weekly when newly planted | Pet-safe |
| Elise's Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season, every 3–5 weeks in winter | Toxic to pets |
| Elizabeth Magnolia | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2 weeks in dry periods once mature | Mildly toxic to pets |
| Elk Horns Pig's Ear | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring/summer; monthly or less in autumn/winter | Toxic to pets |
| Elkhorn Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in summer dormancy | Mildly toxic to pets |
| Elliptic Ginger Lily | Bright indirect light (just back from a sunny window) | Moderate — water regularly but allow soil to partially dry between waterings | Mildly toxic to pets |
| Elliptic Kopsia | Direct sun (at least 4-6 hours) | Every 7–10 days when established; more frequently when young | Toxic to pets |
| Ellwoodii False Cypress | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply weekly while establishing, then during dry spells | Toxic to pets |
| Elm-Leaf Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; reduce to every 14 days in winter | Toxic to pets |
| Elymaitic Rosularia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring/summer; monthly or less in autumn/winter | Mildly toxic to pets |
| Emerald Blue Creeping Phlox | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; drought-tolerant once established (second year onward) | Pet-safe |
| Emerald Gaiety Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Emerald Green Arborvitae | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week when establishing; weekly once rooted in | Mildly toxic to pets |
| Emerald n Gold Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Emerald Spike Moss | Medium indirect light (a couple of metres from a window) | Keep the soil consistently, evenly moist — never let it dry out | Pet-safe |
| Emperor Sago | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days | Toxic to pets |
| Encephalartos Ferox | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in growth, far less in winter | Toxic to pets |
| Encephalartos lebomboensis | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Encephalartos transvenosus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly weekly to fortnightly in summer | Toxic to pets |
| Encrusted Saxifrage | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; rarely in winter | Pet-safe |
| Engelmann Spruce | Direct sun (at least 4-6 hours) | Regular — keep soil consistently moist, especially in the first 3 years after planting | Pet-safe |
| English Yew Bonsai | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, around every 2-4 days in summer and less in winter | Toxic to pets |
| Engraved Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer through autumn (active growth); withheld or near-zero from May through August | Pet-safe |
| Epipremnum amplissimum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Aureum Jessenia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Pinnatum Dragon Tail | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Pinnatum Skeleton Key | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Episcia 'Moss Agate' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Episcia 'Silver Skies' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, about every 5-7 days | Pet-safe |
| Episcia reptans | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Erman's Birch | Direct sun (at least 4-6 hours) | Regular watering for first 2–3 years; occasional once established | Pet-safe |
| Ernst's Spurflower | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Eryngium 'Jade Frost' | Direct sun (at least 4-6 hours) | Water while establishing, then only during prolonged drought | Mildly toxic to pets |
| Eryngium × zabelii 'Big Blue' | Direct sun (at least 4-6 hours) | Sparingly once established; water only in prolonged drought, roughly every 2-3 weeks | Mildly toxic to pets |
| Eryngium bourgatii 'Picos Blue' | Direct sun (at least 4-6 hours) | Minimal once established; only during extended dry spells, roughly every 2-3 weeks | Mildly toxic to pets |
| Eryngium giganteum 'Silver Ghost' | Direct sun (at least 4-6 hours) | Rarely once established; only in prolonged drought, roughly every 2-3 weeks | Mildly toxic to pets |
| Eryngium planum 'Blue Hobbit' | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water new plants until rooted | Mildly toxic to pets |
| Erythronium 'Pagoda' | Bright indirect light (just back from a sunny window) | Keep soil cool and evenly moist in spring; never let bulbs dry out completely | Mildly toxic to pets |
| Eschscholzia californica 'Thai Silk Rose Chiffon' | Direct sun (at least 4-6 hours) | When the soil is dry several centimetres down, roughly every 7-14 days | Mildly toxic to pets |
| Escobar's Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep medium consistently moist | Pet-safe |
| Espostoa lanata | Direct sun (at least 4-6 hours) | When the top few centimetres are dry, about every 2 weeks in summer; sparingly in winter | Pet-safe |
| Espostoa melanostele | Direct sun (at least 4-6 hours) | When the upper soil is dry, about every 2 weeks in summer; sparingly in winter | Pet-safe |
| Eternal Flame Plant | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; every 10-14 days in winter | Pet-safe |
| Etruscan honeysuckle | Direct sun (at least 4-6 hours) | Weekly during dry spells; established plants are drought-tolerant | Mildly toxic to pets |
| Euphorbia aeruginosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer and monthly or less in winter | Toxic to pets |
| Euphorbia ammak | Direct sun (at least 4-6 hours) | When the top half of the soil is dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia antisyphilitica | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer, minimal in winter | Toxic to pets |
| Euphorbia caput-medusae | Direct sun (at least 4-6 hours) | When fully dry, about every 2 weeks in summer; minimal in winter | Toxic to pets |
| Euphorbia clavarioides | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; keep bone-dry in winter | Toxic to pets |
| Euphorbia columnaris | Direct sun (at least 4-6 hours) | When fully dry in warm growth, roughly every 2-3 weeks; almost none in winter | Toxic to pets |
| Euphorbia cooperi | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer; minimal in winter | Toxic to pets |
| Euphorbia enopla | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer; almost none in winter | Toxic to pets |
| Euphorbia esculenta | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, near-zero in winter | Toxic to pets |
| Euphorbia ferox | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; almost none in winter | Toxic to pets |
| Euphorbia flanaganii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in the growing season, monthly or less in winter | Toxic to pets |
| Euphorbia globosa | Direct sun (at least 4-6 hours) | When the soil is bone dry, about every 2-3 weeks in growth, almost none in winter | Toxic to pets |
| Euphorbia gorgonis | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| Euphorbia grandicornis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia groenewaldii | Direct sun (at least 4-6 hours) | When fully dry in the growing season, about every 2-3 weeks; almost none in winter | Toxic to pets |
| Euphorbia horrida | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia ingens | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia knuthii | Direct sun (at least 4-6 hours) | When fully dry in growth, about every 2-3 weeks; keep nearly dry in winter | Toxic to pets |
| Euphorbia lactea 'White Ghost' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia mammillaris | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia meloformis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia milii 'Lutea' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 1-2 weeks; less in winter | Toxic to pets |
| Euphorbia milii 'Rosea' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Euphorbia obesa subsp. symmetrica | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in active growth; nearly dry over winter | Toxic to pets |
| Euphorbia piscidermis | Direct sun (at least 4-6 hours) | Sparingly, only when bone dry, roughly every 3 weeks in growth, nearly none in winter | Toxic to pets |
| Euphorbia polygona | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia pseudocactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; nearly none in winter | Toxic to pets |
| Euphorbia pulvinata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth; near-zero in winter | Toxic to pets |
| Euphorbia resinifera | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; keep nearly dry in winter | Toxic to pets |
| Euphorbia schoenlandii | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer; nearly none in winter | Toxic to pets |
| Euphorbia stellata | Bright indirect light (just back from a sunny window) | Sparingly when fully dry in growth, roughly every 2-3 weeks in summer; none while dormant | Toxic to pets |
| Euphorbia suzannae | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer, sparse in winter | Toxic to pets |
| Euphorbia symmetrica | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| Euphorbia tirucalli 'Firesticks' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia tortirama | Direct sun (at least 4-6 hours) | When the soil is fully dry during growth, roughly every 2-3 weeks; keep dry in winter dormancy | Toxic to pets |
| Euphorbia Trigona 'Rubra' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Euphorbia valida | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| European Ash | Direct sun (at least 4-6 hours) | Moderate; deep watering during drought in first 3 years | Pet-safe |
| European Beech | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil starts to dry, frequently daily in summer | Mildly toxic to pets |
| European Columbine | Medium indirect light (a couple of metres from a window) | Water when the top 3 cm of soil dries, roughly weekly | Mildly toxic to pets |
| European Fan Palm | Direct sun (at least 4-6 hours) | Roughly weekly in spring/summer; every 2-3 weeks in winter | Mildly toxic to pets |
| European feather grass | Direct sun (at least 4-6 hours) | Weekly in the first growing season; only during extreme drought thereafter | Pet-safe |
| European Larch | Direct sun (at least 4-6 hours) | When the surface just starts to dry, frequently twice daily in summer heat | Mildly toxic to pets |
| Eveline's Wax Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer, every 2–3 weeks in winter | Pet-safe |
| Evergold Japanese Sedge | Medium indirect light (a couple of metres from a window) | Every 5-7 days or when the top 2 cm of soil is dry | Pet-safe |
| Evergreen Candytuft | Direct sun (at least 4-6 hours) | Every 1–2 weeks when establishing; drought-tolerant once established | Mildly toxic to pets |
| evergreen miscanthus | Direct sun (at least 4-6 hours) | Every 7–14 days during the growing season; reduce but do not cease in mild winters | Pet-safe |
| Everlasting Sweet Pea | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant once mature | Pet-safe |
| Expanded Lobster Claw | Bright indirect light (just back from a sunny window) | Every 2–4 days in the growing season, reducing in winter | Mildly toxic to pets |
| Eyelash Sage | Bright indirect light (just back from a sunny window) | Every 7-10 days once established | Pet-safe |
| Ezo Spruce | Direct sun (at least 4-6 hours) | When the top centimetre of soil starts to dry, often daily in summer | Mildly toxic to pets |
| Fagus sylvatica 'Dawyck' | Direct sun (at least 4-6 hours) | Weekly while establishing; water in dry spells | Toxic to pets |
| Fagus sylvatica 'Pendula' | Direct sun (at least 4-6 hours) | Weekly deep watering for the first 2-3 years, then rainfall-reliant | Mildly toxic to pets |
| Fagus sylvatica 'Purpurea' | Direct sun (at least 4-6 hours) | Weekly deep soak in the first 2-3 years, then rainfall-reliant | Mildly toxic to pets |
| Fairy Bells | Bright indirect light (just back from a sunny window) | Regular watering autumn to spring; completely dry in summer | Mildly toxic to pets |
| Fairy Castle Cactus | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; every 4-6 weeks in winter | Mildly toxic to pets |
| Fairy fan-flower | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 7–10 days in-ground once established | Pet-safe |
| Fairy Flax | Direct sun (at least 4-6 hours) | Low — rainfall is generally sufficient; water only during severe summer drought | Mildly toxic to pets |
| Fallopia baldschuanica | Direct sun (at least 4-6 hours) | Water deeply during the first two growing seasons; established plants rarely need irrigation | Mildly toxic to pets |
| False Indigo Bush | Direct sun (at least 4-6 hours) | Regular watering (every 5–7 days) during establishment; drought-tolerant once established, or tolerates periodic inundation in wet sites | Mildly toxic to pets |
| False Pereskia Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; reduce to every 3–4 weeks in winter | Pet-safe |
| False Solomon's Seal | Medium indirect light (a couple of metres from a window) | 2–3 times per week in the growing season; reduce in dormancy | Mildly toxic to pets |
| Fanal astilbe | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer; weekly in cool or wet seasons | Pet-safe |
| Farewell-to-spring | Direct sun (at least 4-6 hours) | Every 7–10 days; reduce once established | Pet-safe |
| Fastigiata Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Fat Albert Blue Spruce | Direct sun (at least 4-6 hours) | Water deeply weekly for the first two to three years, then during prolonged dry spells | Mildly toxic to pets |
| Faucaria Bosscheana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growth and far less in winter | Mildly toxic to pets |
| Faulkner box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Feather Cactus | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; keep nearly dry in winter | Pet-safe |
| feather grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; minimal in winter | Pet-safe |
| feathertop grass | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2 weeks once established | Pet-safe |
| Feathery Air Plant | Bright indirect light (just back from a sunny window) | Mist lightly every 2–3 days in warm conditions; reduce to every 4–5 days in cooler weather. | Pet-safe |
| Feelin' Blue Deodar Cedar | Direct sun (at least 4-6 hours) | Weekly when young; monthly once established | Pet-safe |
| Feijoa | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil dries, roughly weekly in summer, less in cooler months | Mildly toxic to pets |
| Female Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week in growing season; reduce significantly in dry or cooler periods | Pet-safe |
| Fenestraria Aurantiaca | Direct sun (at least 4-6 hours) | Sparingly, roughly every 2-3 weeks during autumn-to-spring growth and withheld through summer dormancy | Mildly toxic to pets |
| Fenestraria Rhopalophylla | Direct sun (at least 4-6 hours) | Only when the leaves start to wrinkle, roughly every 2-3 weeks in active growth and almost never in summer dormancy | Mildly toxic to pets |
| Fennel-Leaved Sea Lavender | Direct sun (at least 4-6 hours) | Low to moderate — water to establish, then sparingly | Pet-safe |
| Ferner Osten Maiden Grass | Direct sun (at least 4-6 hours) | Weekly during the first season; established clumps tolerate drought and need water only in extended dry spells | Mildly toxic to pets |
| Fernleaf yarrow | Direct sun (at least 4-6 hours) | Water when top 5 cm of soil is dry; drought-tolerant once established | Mildly toxic to pets |
| Ferocactus glaucescens | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 14 days in summer; keep dry in winter | Pet-safe |
| Ferocactus schwarzii | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Few-flowered Abutilon | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; fortnightly in cooler months | Pet-safe |
| Few-flowered Neoregelia | Bright indirect light (just back from a sunny window) | Keep the central cup topped with water; allow potting medium or mount to dry slightly between waterings | Pet-safe |
| Few-leaflet Zamia | Bright indirect light (just back from a sunny window) | Every 3–4 weeks | Toxic to pets |
| Few-Toothed Tiger Jaws | Direct sun (at least 4-6 hours) | Every 2–4 weeks during active growth (late summer–autumn); sparingly in winter and spring | Pet-safe |
| Ficus Altissima 'Yellow Gem' | Bright indirect light (just back from a sunny window) | When the top 5 cm (2 in) of soil is dry | Toxic to pets |
| Ficus pumila 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Ficus Retusa Bonsai | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil feels dry, often every 2-4 days in growth | Toxic to pets |
| Ficus Ruby | Bright indirect light (just back from a sunny window) | When the top 2-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Fiddle-Leaf Fig Bambino | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, typically every 7-10 days | Toxic to pets |
| Fiddle-leaf Pelargonium | Direct sun (at least 4-6 hours) | Water every 10-14 days in the growing season; reduce to monthly or less in winter | Toxic to pets |
| Field Bindweed | Direct sun (at least 4-6 hours) | Low — extremely drought-tolerant once established | Toxic to pets |
| Field Chickweed | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; very sparingly in autumn and winter | Pet-safe |
| Field marigold | Direct sun (at least 4-6 hours) | Weekly during dry spells; self-sufficient once established | Pet-safe |
| Field Mouse-ear | Direct sun (at least 4-6 hours) | Very low — drought tolerant once established | Mildly toxic to pets |
| Field poppy | Direct sun (at least 4-6 hours) | Once established, every 10–14 days; keep seedbed moist until germination | Mildly toxic to pets |
| Field Quesnelia | Bright indirect light (just back from a sunny window) | Tank every 7 days; soil every 10–14 days | Pet-safe |
| Field Sage | Direct sun (at least 4-6 hours) | Every 10-14 days once established; minimal in winter | Pet-safe |
| Field Scabious | Direct sun (at least 4-6 hours) | Water during establishment and dry spells, then occasionally | Mildly toxic to pets |
| Filicoides Hinoki Cypress | Direct sun (at least 4-6 hours) | Every 5-7 days when young, then when the top few cm of soil dry | Mildly toxic to pets |
| Filifera Aurea Cypress | Direct sun (at least 4-6 hours) | Every 5-7 days while establishing, then when the top few cm of soil dry | Mildly toxic to pets |
| Filmy Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in summer, every 4–5 days in winter | Pet-safe |
| Finger Cactus | Direct sun (at least 4-6 hours) | When the soil has dried fully, roughly every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Finger Poppy Mallow | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; highly drought-tolerant | Mildly toxic to pets |
| Fingered Sedge | Low light (north window or shaded room) | Moderate; keep moist but not waterlogged | Pet-safe |
| Fingertips | Bright indirect light (just back from a sunny window) | Every 2–3 weeks autumn through spring; minimal to none in summer | Pet-safe |
| Fire Alarm Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about weekly | Pet-safe |
| Fire and Ice Hosta | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Fire Barrel Cactus | Direct sun (at least 4-6 hours) | Every 2-4 weeks in summer; withhold in winter | Mildly toxic to pets |
| Fire Crown Cactus | Direct sun (at least 4-6 hours) | When the mix is completely dry, about every 10-14 days in growth; withhold entirely in winter | Pet-safe |
| Firebush | Direct sun (at least 4-6 hours) | Weekly until established; every 10–14 days once mature | Mildly toxic to pets |
| Firecracker plant | Bright indirect light (just back from a sunny window) | Every 4–7 days; never allow soil to dry fully | Pet-safe |
| Firecracker Plant | Direct sun (at least 4-6 hours) | Every 5–7 days during growth; every 10–14 days once established | Mildly toxic to pets |
| Firefly heather | Direct sun (at least 4-6 hours) | Weekly during establishment; occasional deep watering once established | Pet-safe |
| Firesticks Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Fishbone Fern | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Fishhook Barrel | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep dry in winter | Pet-safe |
| Fishhook Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer; little to none from late autumn through winter | Pet-safe |
| Fishtail Holly Fern | Low light (north window or shaded room) | Every 7–10 days; less in winter | Pet-safe |
| Fishtail Parlour Palm | Low light (north window or shaded room) | Every 7–10 days in spring and summer; every 14–21 days in autumn and winter | Pet-safe |
| Fishtail Sword Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days in warm weather; every 6–8 days in cooler months | Pet-safe |
| Fittonia albivenis 'Juanita' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil begins to dry, often every 3-5 days | Pet-safe |
| Fittonia albivenis 'Purple Vein' | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil just starts to dry, often every 3-5 days | Pet-safe |
| Fittonia albivenis 'Skeleton' | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil just begins to dry, often every 3-5 days | Pet-safe |
| Five Fingers Arrowhead Vine | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; every 10–14 days in winter | Toxic to pets |
| Five-leaf akebia | Medium indirect light (a couple of metres from a window) | Once a week when establishing; drought-tolerant once mature | Mildly toxic to pets |
| Flaky Juniper | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly during establishment year | Mildly toxic to pets |
| Flame Freesia | Direct sun (at least 4-6 hours) | Water freely in active growth; withhold completely during summer dormancy | Mildly toxic to pets |
| Flame nasturtium | Bright indirect light (just back from a sunny window) | Water regularly to maintain consistent moisture, especially in spring and summer | Pet-safe |
| Flame vine | Direct sun (at least 4-6 hours) | Every 7–10 days during establishment; once every 2–3 weeks once established. | Mildly toxic to pets |
| Flanagan's Sage | Direct sun (at least 4-6 hours) | Every 10-14 days during the growing season; rarely in winter | Pet-safe |
| Flandria Blushing Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup weekly; water soil every 2–3 weeks | Pet-safe |
| Flat Sea Holly | Direct sun (at least 4-6 hours) | Low — water occasionally during the first growing season, then minimal | Pet-safe |
| Flat-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring and summer; reduce to every 14-21 days in winter | Pet-safe |
| Flat-Leaved Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; minimal in winter | Pet-safe |
| Flat-lipped Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep medium evenly moist; water every 2–4 days | Mildly toxic to pets |
| Flat-Stem Wax Plant | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; less frequently in winter | Pet-safe |
| Flexuous Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter rest | Pet-safe |
| Floating Aponogeton | Medium indirect light (a couple of metres from a window) | Permanently submerged bulb with floating leaves; fortnightly 20–25% water changes | Pet-safe |
| Florida Arrowroot | Bright indirect light (just back from a sunny window) | Every 14–21 days; much less in winter | Toxic to pets |
| Florida Columnea | Bright indirect light (just back from a sunny window) | When top 2–3 cm of mix dries | Pet-safe |
| Florida Silver Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days, less in winter | Mildly toxic to pets |
| Flower Carpet Rose | Direct sun (at least 4-6 hours) | Deeply once a week in the growing season; more in containers or heat | Pet-safe |
| Flowering Cherry 'Kanzan' | Direct sun (at least 4-6 hours) | Water young trees weekly in dry spells; mature trees rarely need watering | Toxic to pets |
| Flowering currant | Bright indirect light (just back from a sunny window) | Weekly when establishing; drought-tolerant once mature | Mildly toxic to pets |
| Flowering Dogwood | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply weekly in dry spells | Mildly toxic to pets |
| Flowering Dogwood 'Cherokee Chief' | Bright indirect light (just back from a sunny window) | Weekly deep watering, more in drought | Pet-safe |
| Flowering Quince 'Crimson and Gold' | Direct sun (at least 4-6 hours) | Water while establishing; drought-tolerant once settled | Mildly toxic to pets |
| Flowering Quince 'Texas Scarlet' | Direct sun (at least 4-6 hours) | Weekly in the first year; rarely needed once established | Mildly toxic to pets |
| Flowering tobacco | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil consistently moist | Toxic to pets |
| Fly Bush | Direct sun (at least 4-6 hours) | Keep substrate consistently moist but not waterlogged; water every 2–4 days depending on conditions | Pet-safe |
| Fly-catching Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; allow the surface to barely begin to dry | Pet-safe |
| Flying Saucer Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly weekly to fortnightly in summer; keep nearly dry in winter | Pet-safe |
| Foamy Bells 'Sweet Tea' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Mildly toxic to pets |
| Forbes' Glory of the Snow | Bright indirect light (just back from a sunny window) | Minimal once established; natural rainfall usually sufficient during growing season | Mildly toxic to pets |
| Forest Pepper | Medium indirect light (a couple of metres from a window) | Every 6–9 days; allow top 3–4 cm of soil to dry | Mildly toxic to pets |
| Forked Aichryson | Bright indirect light (just back from a sunny window) | Every 10–14 days during active growth; reduced in winter rest | Mildly toxic to pets |
| Forked Spleenwort | Medium indirect light (a couple of metres from a window) | Sparingly — water only when the growing medium is dry | Mildly toxic to pets |
| Formosan Polypody | Medium indirect light (a couple of metres from a window) | Every 5–7 days in active growth; every 10–14 days in cooler months | Pet-safe |
| Formosanum Toad Lily | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water when the top of the soil begins to dry, often twice weekly in summer heat | Mildly toxic to pets |
| Forrests Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; very sparingly in winter | Pet-safe |
| Forsythia 'Lynwood Gold' | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in extended dry spells | Pet-safe |
| Forsythia 'Show Off' | Direct sun (at least 4-6 hours) | Weekly to establish, then mainly during dry spells | Pet-safe |
| Fortune's Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Fortune's Plum Yew | Medium indirect light (a couple of metres from a window) | Every 7–14 days; allow the top inch of soil to partially dry between waterings | Toxic to pets |
| Foster's Basket Bromeliad | Medium indirect light (a couple of metres from a window) | Tank every 5–7 days; soil every 10–14 days | Pet-safe |
| Fothergilla 'Mount Airy' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly weekly while establishing | Mildly toxic to pets |
| Fothergilla gardenii | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly weekly while establishing | Mildly toxic to pets |
| Fothergilla major | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly while establishing | Mildly toxic to pets |
| Fountain Bamboo | Medium indirect light (a couple of metres from a window) | Twice weekly during the growing season; once weekly in cool periods | Pet-safe |
| Four-stamen Tamarisk | Direct sun (at least 4-6 hours) | Moderate to low; drought-tolerant once established | Pet-safe |
| Foxglove | Bright indirect light (just back from a sunny window) | Regularly — weekly in summer, less in winter | Toxic to pets |
| Foxglove beardtongue | Direct sun (at least 4-6 hours) | Every 7–10 days during establishment; drought-tolerant once established | Mildly toxic to pets |
| Foxtail Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 inches of soil are dry | Toxic to pets |
| Foxtail Palm | Direct sun (at least 4-6 hours) | When the top few cm of soil dries; regularly in growth | Mildly toxic to pets |
| Foxtail Pine | Direct sun (at least 4-6 hours) | Deep soak every 2-3 weeks once established; let soil dry between waterings | Mildly toxic to pets |
| Fragrans Maidenhair Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist at all times, often every 2-4 days | Pet-safe |
| Fragrant Bouquet Hosta | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply 1-2 times weekly, more in heat | Toxic to pets |
| Fragrant Bursera | Direct sun (at least 4-6 hours) | Every 7–10 days in summer growing season; very sparingly in winter | Mildly toxic to pets |
| Fragrant Peace Lily | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-10 days | Toxic to pets |
| Fragrant Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; drought-tolerant once established | Toxic to pets |
| Fragrant Stanhopea | Bright indirect light (just back from a sunny window) | Daily or near-daily during active growth; reduce to every 2–3 days in winter | Pet-safe |
| Fragrant Stomatium | Bright indirect light (just back from a sunny window) | Sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Franklin's Gem Boxwood | Direct sun (at least 4-6 hours) | Deep soak weekly during the first two seasons, then every 10-14 days in dry spells | Toxic to pets |
| Frau Dagmar Hartopp Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant once settled | Pet-safe |
| Fred Ives | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in winter | Pet-safe |
| French marigold | Direct sun (at least 4-6 hours) | Once or twice weekly; let the top 2 cm of soil dry between waterings | Mildly toxic to pets |
| French Tamarisk | Direct sun (at least 4-6 hours) | Moderate; drought-tolerant once established | Pet-safe |
| Freyn's Pink | Direct sun (at least 4-6 hours) | Infrequent; drought-tolerant once established | Mildly toxic to pets |
| Friedrich's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn; none during summer dormancy | Pet-safe |
| Friedrich's Window Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn and spring; minimal to none in summer | Mildly toxic to pets |
| Friendship Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Pet-safe |
| Fringed Bleeding Heart | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Toxic to pets |
| Fringed Caralluma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Mildly toxic to pets |
| Fringed Coreopsis | Direct sun (at least 4-6 hours) | Every 1–2 weeks once established; more frequently when young | Pet-safe |
| Fringed Houseleek | Direct sun (at least 4-6 hours) | Low — water sparingly, allowing soil to dry fully | Pet-safe |
| Fritschs Pouch Flower | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce in winter to every 10–14 days | Pet-safe |
| Fritz Luth Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in spring and summer; every 3–5 days in winter | Pet-safe |
| Fritz Luth Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in growing season; every 4–5 days in winter | Pet-safe |
| Frohnleiten Epimedium | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 1-2 weeks | Mildly toxic to pets |
| Front Range Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal in winter | Pet-safe |
| frost grass | Medium indirect light (a couple of metres from a window) | Weekly or whenever the top 2–3 cm of soil dries out; reduce in autumn and winter | Pet-safe |
| Frosted Curls Sedge | Bright indirect light (just back from a sunny window) | Weekly, or when top 2-3 cm of soil is dry | Pet-safe |
| Frosty Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the surface just begins to dry, often 2-3 times per week | Pet-safe |
| Fujian Cypress | Bright indirect light (just back from a sunny window) | Once or twice a week during the growing season; reduce in winter | Mildly toxic to pets |
| Full Moon Maple | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly weekly in summer | Pet-safe |
| Furuse's Orostachys | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal watering in winter | Pet-safe |
| Furzey Darley Dale heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Gaillardia 'Arizona Sun' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 7-10 days once established | Mildly toxic to pets |
| Gaillardia 'Goblin' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days once established | Mildly toxic to pets |
| Garden Catmint | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly every 7-10 days while establishing, then rarely | Mildly toxic to pets |
| Garden Phlox | Bright indirect light (just back from a sunny window) | 1-2 times per week during active growth | Mildly toxic to pets |
| Garden verbena | Direct sun (at least 4-6 hours) | Every 3–5 days during active growth; reduce in cooler weather | Mildly toxic to pets |
| Gardenia 'Frostproof' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of soil dries, about every 4-7 days | Toxic to pets |
| Garlic Bignone | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant when established | Mildly toxic to pets |
| Gasteria (Ox Tongue) | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly or less in autumn/winter | Mildly toxic to pets |
| Gasteria Acinacifolia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Armstrongii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Batesiana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Glomerata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Nitida | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Obliqua | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Pillansii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 3 weeks in growth | Pet-safe |
| Gasteria Pulchra | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Rawlinsonii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gazania × hybrida 'Tiger Stripes' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Gazania rigens 'Daybreak Garden Sun' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Geisha Girl flowering quince | Bright indirect light (just back from a sunny window) | Weekly during establishment; occasional supplemental watering once established | Mildly toxic to pets |
| Geneva Bugle | Bright indirect light (just back from a sunny window) | Once weekly during establishment; every 10–14 days once established | Mildly toxic to pets |
| Gentle Hermione Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week during the growing season; more in heat | Pet-safe |
| Georgia Blue Speedwell | Direct sun (at least 4-6 hours) | Moderate; water when the top 2–3 cm of soil dries out | Pet-safe |
| Geranium 'Ann Folkard' | Direct sun (at least 4-6 hours) | Weekly while establishing and in dry spells; little once mature. | Mildly toxic to pets |
| Geranium 'Brookside' | Direct sun (at least 4-6 hours) | Weekly while establishing and in droughts; minimal once settled. | Mildly toxic to pets |
| Geranium 'Johnson's Blue' | Direct sun (at least 4-6 hours) | Water to establish in the first season; thereafter when the top few cm of soil is dry, roughly weekly in dry spells | Pet-safe |
| Geranium 'Nimbus' | Direct sun (at least 4-6 hours) | Weekly while establishing and during dry spells; drought-tolerant when mature | Mildly toxic to pets |
| Geranium 'Orion' | Direct sun (at least 4-6 hours) | Weekly while establishing and in dry spells; drought-tolerant once mature | Mildly toxic to pets |
| Geranium 'Patricia' | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm dries, roughly weekly in growing season; established clumps tolerate some dryness | Mildly toxic to pets |
| Geranium (pelargonium) | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 5-10 days | Toxic to pets |
| Geranium × oxonianum 'Wargrave Pink' | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry; roughly weekly, more in heat | Mildly toxic to pets |
| Geranium cantabrigiense | Direct sun (at least 4-6 hours) | Weekly while establishing; very little once settled. | Mildly toxic to pets |
| Geranium cantabrigiense 'Biokovo' | Direct sun (at least 4-6 hours) | Weekly while establishing; very little thereafter. | Mildly toxic to pets |
| Geranium cantabrigiense 'Cambridge' | Bright indirect light (just back from a sunny window) | Water deeply during the first season; established plants need watering only in prolonged drought | Mildly toxic to pets |
| Geranium clarkei 'Kashmir Purple' | Direct sun (at least 4-6 hours) | Weekly while establishing and in droughts; drought-tolerant once settled | Mildly toxic to pets |
| Geranium clarkei 'Kashmir White' | Direct sun (at least 4-6 hours) | Weekly while establishing and in droughts; drought-tolerant once settled | Mildly toxic to pets |
| Geranium endressii | Bright indirect light (just back from a sunny window) | Water through establishment; afterwards in dry spells only | Mildly toxic to pets |
| Geranium himalayense | Direct sun (at least 4-6 hours) | Weekly during the first season and in dry spells; established plants are drought-tolerant | Mildly toxic to pets |
| Geranium himalayense 'Gravetye' | Direct sun (at least 4-6 hours) | Weekly while establishing and during droughts; drought-tolerant once rooted | Mildly toxic to pets |
| Geranium himalayense 'Plenum' | Direct sun (at least 4-6 hours) | Weekly while establishing and in drought; otherwise drought-tolerant once settled | Mildly toxic to pets |
| Geranium macrorrhizum | Medium indirect light (a couple of metres from a window) | Water to establish; afterwards only in extended drought, roughly every 1-2 weeks if very dry | Pet-safe |
| Geranium macrorrhizum 'Bevan's Variety' | Medium indirect light (a couple of metres from a window) | When the top 4-5 cm of soil is dry; weekly to establish, seldom afterwards | Mildly toxic to pets |
| Geranium macrorrhizum 'Spessart' | Bright indirect light (just back from a sunny window) | Water deeply when top 5 cm of soil is dry; established plants need little to no supplemental water | Mildly toxic to pets |
| Geranium maculatum 'Elizabeth Ann' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply when the top 3-4 cm dries, about weekly during the growing season | Mildly toxic to pets |
| Geranium nodosum | Low light (north window or shaded room) | Water when the top 3-5 cm dries; established plants tolerate occasional dryness, roughly every 7-12 days in growing season | Mildly toxic to pets |
| Geranium phaeum | Medium indirect light (a couple of metres from a window) | Water when top 3-5 cm of soil is dry; keep evenly moist in its first season | Mildly toxic to pets |
| Geranium phaeum 'Album' | Medium indirect light (a couple of metres from a window) | Water when top 3-5 cm of soil is dry; keep evenly moist while establishing | Mildly toxic to pets |
| Geranium phaeum 'Lily Lovell' | Medium indirect light (a couple of metres from a window) | Water when top 3-5 cm of soil is dry; keep evenly moist while establishing | Mildly toxic to pets |
| Geranium phaeum 'Samobor' | Medium indirect light (a couple of metres from a window) | Water when top 3-5 cm of soil is dry; keep evenly moist while establishing | Mildly toxic to pets |
| Geranium pratense | Direct sun (at least 4-6 hours) | Roughly weekly in the first season and during prolonged dry spells; established plants need little. | Mildly toxic to pets |
| Geranium pratense 'Mrs Kendall Clark' | Direct sun (at least 4-6 hours) | About weekly while establishing and in dry spells; little once settled. | Mildly toxic to pets |
| Geranium pratense 'Plenum Violaceum' | Direct sun (at least 4-6 hours) | Weekly while establishing and during droughts; minimal once mature. | Mildly toxic to pets |
| Geranium pratense 'Victor Reiter Junior' | Direct sun (at least 4-6 hours) | Weekly while establishing and in dry spells; sparing once settled. | Mildly toxic to pets |
| Geranium psilostemon | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; about weekly, more in heat | Mildly toxic to pets |
| Geranium renardii | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm dries; drought-tolerant once established, roughly every 10-14 days in growing season | Mildly toxic to pets |
| Geranium renardii 'Phillipe Vapelle' | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm dries; drought-tolerant once established, roughly every 10-14 days in growing season | Mildly toxic to pets |
| Geranium sanguineum | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry; weekly while establishing, infrequently once mature | Mildly toxic to pets |
| Geranium sanguineum 'Album' | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil is dry; established plants are drought-tolerant | Mildly toxic to pets |
| Geranium sanguineum 'Max Frei' | Direct sun (at least 4-6 hours) | Water when top 3-5 cm of soil is dry; drought-tolerant once established | Mildly toxic to pets |
| Geranium sanguineum var. striatum | Direct sun (at least 4-6 hours) | Water when top 3-5 cm of soil is dry; drought-tolerant once established | Mildly toxic to pets |
| Geranium sylvaticum | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply when the top 3-4 cm dries, roughly weekly in growing season | Mildly toxic to pets |
| Geranium sylvaticum 'Mayflower' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water deeply when the top 3-4 cm dries, about weekly through the growing season | Mildly toxic to pets |
| Geranium wallichianum 'Buxton's Variety' | Bright indirect light (just back from a sunny window) | Water during establishment, then keep just-moist through summer; little needed in winter dormancy | Mildly toxic to pets |
| Geranium wallichianum 'Syabru' | Bright indirect light (just back from a sunny window) | Water during establishment, then keep evenly moist through the growing season | Mildly toxic to pets |
| Geranium x magnificum | Direct sun (at least 4-6 hours) | Weekly in the first season and during drought; established plants are fairly drought-tolerant | Mildly toxic to pets |
| Geranium x oxonianum | Bright indirect light (just back from a sunny window) | Water through the first season; thereafter only during sustained dry spells | Mildly toxic to pets |
| Geranium x oxonianum 'A.T. Johnson' | Bright indirect light (just back from a sunny window) | Water through establishment; thereafter only in prolonged dry spells | Mildly toxic to pets |
| Geranium x oxonianum 'Claridge Druce' | Bright indirect light (just back from a sunny window) | Water during the first season; afterwards only in extended drought | Mildly toxic to pets |
| Geranium x oxonianum 'Wargrave Pink' | Bright indirect light (just back from a sunny window) | Water during establishment; afterwards only in extended drought | Mildly toxic to pets |
| Germander Speedwell | Medium indirect light (a couple of metres from a window) | Moderate — keep soil consistently moist, especially in summer | Pet-safe |
| Gertrude Jekyll Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season; more in heat or sandy soil | Pet-safe |
| Geum 'Mrs. J. Bradshaw' | Direct sun (at least 4-6 hours) | Water when the top 3 cm of soil dries, about weekly | Mildly toxic to pets |
| Geum 'Prinses Juliana' | Direct sun (at least 4-6 hours) | Keep soil moist but not waterlogged; water every 4-7 days in dry weather | Mildly toxic to pets |
| Geum 'Totally Tangerine' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply every 5-7 days in dry spells | Mildly toxic to pets |
| Ghost Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season, reduce in winter | Pet-safe |
| Ghost Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and monthly or less in winter | Pet-safe |
| Giant Autumn Daffodil | Direct sun (at least 4-6 hours) | Minimal water during autumn–spring growth; bone dry in summer | Toxic to pets |
| Giant Bamboo | Direct sun (at least 4-6 hours) | Frequently; requires abundant moisture year-round | Pet-safe |
| Giant Barrel Cactus | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer; rarely or not at all in winter | Mildly toxic to pets |
| Giant Chalk Dudleya | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer, monthly or less in winter | Pet-safe |
| Giant Chinese Silver Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; moderate, regular water thereafter | Mildly toxic to pets |
| Giant Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering for young trees; deep watering in droughts for mature specimens | Pet-safe |
| Giant Dorstenia | Direct sun (at least 4-6 hours) | Every 7–14 days in summer; every 3–4 weeks in winter | Mildly toxic to pets |
| Giant Dutchman's pipe | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil evenly moist but not saturated. | Toxic to pets |
| Giant Feather Grass | Direct sun (at least 4-6 hours) | Every 7-10 days in the first season while establishing, then rarely | Mildly toxic to pets |
| Giant honeysuckle | Direct sun (at least 4-6 hours) | Twice weekly in active growth; reduce significantly in cooler months | Mildly toxic to pets |
| Giant Ixora | Direct sun (at least 4-6 hours) | Every 2-3 days in warm weather, once a week in cooler periods | Mildly toxic to pets |
| Giant Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–4 days in active growth; every 5–7 days in winter | Pet-safe |
| giant reed grass | Direct sun (at least 4-6 hours) | Regularly; prefers medium to wet conditions and will grow in standing water | Mildly toxic to pets |
| Giant Sacaton | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent during establishment | Pet-safe |
| Giant Sacaton Grass | Direct sun (at least 4-6 hours) | Water to establish the first season, then occasionally in drought, roughly every 2-3 weeks | Mildly toxic to pets |
| Giant Sequoia | Direct sun (at least 4-6 hours) | Weekly while establishing; deep occasional soaks once mature | Mildly toxic to pets |
| Giant Sequoia 'Glaucum' | Direct sun (at least 4-6 hours) | Deeply once or twice a week while establishing; then during dry spells | Mildly toxic to pets |
| Giant Thevetia | Direct sun (at least 4-6 hours) | Every 7–14 days once established; water deeply during the growing season | Toxic to pets |
| Giant Thorny Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during the growing season; reduce in the dry season | Pet-safe |
| Giant Timber Bamboo | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week; more frequently in hot weather or during shooting season | Pet-safe |
| Giant Vriesea | Bright indirect light (just back from a sunny window) | Flush cup weekly; water medium every 2 weeks | Pet-safe |
| Giant Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Gibbaeum heathii | Direct sun (at least 4-6 hours) | Sparingly in autumn-spring growth; near-zero through summer dormancy | Mildly toxic to pets |
| Gibbaeum petrense | Direct sun (at least 4-6 hours) | Light watering in autumn-spring; withhold through summer | Mildly toxic to pets |
| Gibbaeum velutinum | Direct sun (at least 4-6 hours) | Moderate in autumn-spring; minimal in summer | Mildly toxic to pets |
| Ginkgo 'Autumn Gold' | Direct sun (at least 4-6 hours) | Regularly for the first 2-3 years; drought-tolerant once established | Mildly toxic to pets |
| Ginkgo 'Fastigiata' | Direct sun (at least 4-6 hours) | Weekly while establishing in the first 1-2 years; rarely once mature | Mildly toxic to pets |
| Ginkgo 'Mariken' | Direct sun (at least 4-6 hours) | Weekly when young or container-grown; occasionally once established in ground | Mildly toxic to pets |
| Ginkgo 'Saratoga' | Direct sun (at least 4-6 hours) | Weekly during establishment; minimal once mature | Mildly toxic to pets |
| Girard's Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Mildly toxic to pets |
| Gireoud's Brassia | Bright indirect light (just back from a sunny window) | Every 3–4 days during active growth; reduce to weekly or less in cooler months | Pet-safe |
| Glacier Pink | Direct sun (at least 4-6 hours) | Low; water very sparingly, letting the soil nearly dry out between waterings | Mildly toxic to pets |
| Gladiolus-Flowered Werauhia | Bright indirect light (just back from a sunny window) | Refill the central tank weekly; water the growing medium every 1-2 weeks | Pet-safe |
| Glandular Heron's Bill | Direct sun (at least 4-6 hours) | Water sparingly; allow soil to dry almost completely between waterings | Mildly toxic to pets |
| Glandular Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep medium consistently moist; water every 2–4 days | Mildly toxic to pets |
| Glandular Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly or not at all in winter | Pet-safe |
| Glandular-stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; monthly in winter | Mildly toxic to pets |
| Glaucous Lampranthus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer growing season; every 4–6 weeks in winter | Mildly toxic to pets |
| Glaucous Sedge | Medium indirect light (a couple of metres from a window) | Low to moderate — drought-tolerant when established | Pet-safe |
| Glaziou's Fuchsia | Bright indirect light (just back from a sunny window) | Water freely in growth; reduce in winter | Pet-safe |
| Gleditsia triacanthos 'Sunburst' | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are notably drought-tolerant | Pet-safe |
| Gleditsia triacanthos f. inermis | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are highly drought-tolerant | Pet-safe |
| Globe amaranth | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant once established | Pet-safe |
| Globe Blue Spruce | Direct sun (at least 4-6 hours) | Weekly during the first 2 years; every 2–3 weeks once established | Mildly toxic to pets |
| Globe candytuft | Direct sun (at least 4-6 hours) | Every 7–10 days; keep evenly moist but not waterlogged | Pet-safe |
| Globe-Flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–5 weeks in winter | Pet-safe |
| Glory of the Sun | Direct sun (at least 4-6 hours) | Moderate in growth; completely dry in summer dormancy | Mildly toxic to pets |
| Glossy Abelia | Direct sun (at least 4-6 hours) | Regularly during the first growing season; occasional deep watering once established | Pet-safe |
| Gmelin's Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Pet-safe |
| Goat's Horn Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep dry from late autumn through winter | Pet-safe |
| Goat's-beard | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Mildly toxic to pets |
| Goeppertia majestica 'Whitestar' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, typically every 5-7 days | Pet-safe |
| Goeppertia Pluriplicata | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Goeppertia Roseopicta Illustris | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Goeppertia White Fusion | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Gold Coast Juniper | Direct sun (at least 4-6 hours) | Water deeply through the first season; thereafter mainly in prolonged drought | Toxic to pets |
| Gold Dust Alyssum | Direct sun (at least 4-6 hours) | Fortnightly to monthly once established (very drought-tolerant) | Pet-safe |
| Gold Haze heather | Direct sun (at least 4-6 hours) | Weekly during first season; occasional watering once established | Pet-safe |
| Gold Heart Bleeding Heart | Medium indirect light (a couple of metres from a window) | Weekly during the growing season, reducing as foliage dies back in summer | Toxic to pets |
| Gold Plate yarrow | Direct sun (at least 4-6 hours) | Every 1–2 weeks once established; more frequent during establishment | Mildly toxic to pets |
| Gold Tooth Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in growth | Toxic to pets |
| Golden Alexanders | Bright indirect light (just back from a sunny window) | Weekly or as needed to keep soil moist | Pet-safe |
| Golden Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (soil evenly moist; never waterlogged) | Toxic to pets |
| Golden Apple | Direct sun (at least 4-6 hours) | Every 7–14 days; moderate drought tolerance when established | Pet-safe |
| Golden Ash | Direct sun (at least 4-6 hours) | Moderate; regular deep watering when establishing | Pet-safe |
| Golden Bamboo | Direct sun (at least 4-6 hours) | Weekly when establishing; drought-tolerant once established | Pet-safe |
| Golden Barrel Cactus | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; every 4-6 weeks in winter | Mildly toxic to pets |
| Golden Chalice Vine | Direct sun (at least 4-6 hours) | Weekly in active growth; every 2–3 weeks in winter | Toxic to pets |
| Golden Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Pet-safe |
| Golden Cliff Stonecrop | Direct sun (at least 4-6 hours) | Every 10–14 days in spring and autumn; monthly in summer; very sparingly in winter | Pet-safe |
| Golden Deodar Cedar | Direct sun (at least 4-6 hours) | Moderately; regularly during establishment, infrequently once mature | Mildly toxic to pets |
| Golden everlasting | Direct sun (at least 4-6 hours) | Every 7–10 days once established; reduce in autumn | Pet-safe |
| golden fescue | Direct sun (at least 4-6 hours) | Low; water every 10–14 days during the growing season, less in winter | Pet-safe |
| Golden Globe Arborvitae | Direct sun (at least 4-6 hours) | Twice weekly while establishing; weekly thereafter | Mildly toxic to pets |
| Golden Hakone Grass | Medium indirect light (a couple of metres from a window) | Weekly, or whenever the top 2–3 cm of soil dry out | Mildly toxic to pets |
| Golden Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks (allow soil to dry completely between waterings) | Pet-safe |
| Golden Japanese Sweet Flag | Bright indirect light (just back from a sunny window) | Keep the soil constantly moist to wet; water as soon as the surface begins to dry, often every 2-4 days | Mildly toxic to pets |
| Golden Japanese Sweet Flag | Medium indirect light (a couple of metres from a window) | Keep constantly moist; tolerate standing water | Pet-safe |
| Golden Lace Cactus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 2-3 weeks in summer; keep nearly dry in winter | Pet-safe |
| Golden Malayan Dwarf Coconut | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in heat, never drying out fully | Pet-safe |
| golden mosaic plant | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Golden Polypody | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and summer; every 10–14 days in autumn and winter | Pet-safe |
| Golden Powder Puff | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Golden Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–4 weeks when established; very little in winter | Pet-safe |
| Golden Sedum | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Golden St. John's Wort | Direct sun (at least 4-6 hours) | Weekly during the first growing season; minimal once established | Mildly toxic to pets |
| Golden Torch Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about weekly to fortnightly in summer; keep dry in winter | Pet-safe |
| Golden-Edged Cymbidium | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, about every 5-7 days, drier in winter | Pet-safe |
| Golden-flowered Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; minimally in winter | Pet-safe |
| Golden-Hair Bamboo | Bright indirect light (just back from a sunny window) | Twice per week in growing season; once per week or less in winter | Pet-safe |
| Golden-Leaved Jerusalem Sage | Direct sun (at least 4-6 hours) | Low — water every 2–3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Goldencup St. John's Wort | Bright indirect light (just back from a sunny window) | Once or twice weekly when young; every 1–2 weeks once established | Mildly toxic to pets |
| Goldenrod | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Goldfinger Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil is dry, every 2-4 days in active growth | Pet-safe |
| Goldmoss Stonecrop | Direct sun (at least 4-6 hours) | Rarely — established plants rely on rainfall; water only in prolonged drought | Mildly toxic to pets |
| Goldtau Tufted Hair Grass | Bright indirect light (just back from a sunny window) | Keep evenly moist, watering deeply 1-2 times weekly when dry | Mildly toxic to pets |
| Gollum Jade | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Gomphrena globosa 'QIS Pink' | Direct sun (at least 4-6 hours) | Water deeply once a week; let soil dry between waterings | Pet-safe |
| Gomphrena haageana 'Strawberry Fields' | Direct sun (at least 4-6 hours) | Water deeply about weekly; allow soil to dry between | Mildly toxic to pets |
| Gongora quinquenervis | Bright indirect light (just back from a sunny window) | When the medium approaches dryness, often every 2-4 days in growth | Mildly toxic to pets |
| Gout Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; sparingly (every 3–4 weeks) in winter | Toxic to pets |
| Gowen Cypress | Direct sun (at least 4-6 hours) | Infrequently; drought-tolerant once established | Mildly toxic to pets |
| Graceful Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in summer; every 4–5 days in winter | Pet-safe |
| Gracillimus Maiden Grass | Direct sun (at least 4-6 hours) | Weekly in year one, then mainly during extended dry spells | Mildly toxic to pets |
| Grand Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once mature | Pet-safe |
| Grandidier's Baobab | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; virtually none in autumn–winter dormancy | Pet-safe |
| Grandidier's Uncarina | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; withhold almost entirely October–March | Mildly toxic to pets |
| Grape-Vine Begonia | Bright indirect light (just back from a sunny window) | Every 6–9 days in growing season; every 10–14 days in winter | Toxic to pets |
| Grapeleaf Abutilon | Direct sun (at least 4-6 hours) | Moderate; established plants are fairly drought-tolerant | Mildly toxic to pets |
| Graptopetalum amethystinum | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 12-16 days in summer, sparingly in winter | Pet-safe |
| Graptopetalum macdougallii | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 12-16 days in summer, minimal in winter | Pet-safe |
| Graptopetalum pentandrum | Direct sun (at least 4-6 hours) | Every 2-3 weeks (less in winter) | Pet-safe |
| Graptopetalum rusbyi | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Graptosedum 'Francesco Baldi' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Graptosedum 'Vera Higgins' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Graptoveria 'Bashful' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, sparingly in winter | Mildly toxic to pets |
| Graptoveria 'Debbie' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, minimal in winter | Mildly toxic to pets |
| Graptoveria 'Fred Ives' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Graptoveria 'Opalina' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, sparingly in winter | Mildly toxic to pets |
| Graptoveria 'Silver Star' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, minimal in winter | Mildly toxic to pets |
| Graptoveria 'Titubans' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Grass-leaved Zamia | Direct sun (at least 4-6 hours) | Every 14–21 days in growing season; monthly or less in winter | Toxic to pets |
| Grassy Arrowhead | Direct sun (at least 4-6 hours) | Permanently aquatic; grow in standing water 5–30 cm (2–12 in) deep | Pet-safe |
| Gray Birch | Direct sun (at least 4-6 hours) | Moderate; tolerates drier conditions than most birches once established | Pet-safe |
| Gray Goldenrod | Direct sun (at least 4-6 hours) | Very drought-tolerant; supplemental water rarely needed | Pet-safe |
| Gray's sedge | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water every 2–4 days in dry weather | Pet-safe |
| Grayswood Pink Rock Rose | Direct sun (at least 4-6 hours) | Minimal once established — established plants are drought-tolerant and need watering only during prolonged summer dry spells. | Mildly toxic to pets |
| Great Expectations Hosta | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Great Masterwort | Medium indirect light (a couple of metres from a window) | Regularly — keep soil evenly moist throughout the growing season | Mildly toxic to pets |
| Great Mullein | Direct sun (at least 4-6 hours) | Low — once established, rainfall is usually sufficient | Mildly toxic to pets |
| Great Solomon's Seal | Low light (north window or shaded room) | Every 4-6 days in active growth; drought-tolerant once established | Toxic to pets |
| Greater Coreopsis | Bright indirect light (just back from a sunny window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Greater Knapweed | Direct sun (at least 4-6 hours) | Rarely needed once established; water new plants occasionally through their first summer | Pet-safe |
| Greater Periwinkle | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; every 10–14 days once established | Toxic to pets |
| Greater Pyramidal Saxifrage | Direct sun (at least 4-6 hours) | Every 10–14 days during the growing season; very sparingly in winter | Pet-safe |
| Greater Quaking Grass | Direct sun (at least 4-6 hours) | Water seedlings until established, then only during prolonged drought, roughly every 10-14 days | Mildly toxic to pets |
| Greater Sea Kale | Bright indirect light (just back from a sunny window) | Moderate — water regularly while establishing, then during dry spells | Mildly toxic to pets |
| Greek Cyclamen | Bright indirect light (just back from a sunny window) | Dry in summer dormancy; moderate during autumn and winter growth | Toxic to pets |
| Greek Fir | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; rarely needed once mature | Pet-safe |
| Greek yarrow | Direct sun (at least 4-6 hours) | Every 10–14 days during establishment; minimal once mature | Mildly toxic to pets |
| Green Ash | Direct sun (at least 4-6 hours) | Weekly when establishing; drought-tolerant once mature | Pet-safe |
| Green Comet Milkweed | Bright indirect light (just back from a sunny window) | Low; highly drought-tolerant once established | Toxic to pets |
| Green Dragon | Medium indirect light (a couple of metres from a window) | Regularly during spring and summer growing season | Toxic to pets |
| Green Gem Boxwood | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Green Glaucous Bamboo | Direct sun (at least 4-6 hours) | Twice weekly during establishment; every 7–14 days once mature | Pet-safe |
| Green Milkweed | Direct sun (at least 4-6 hours) | Low to moderate; every 1–2 weeks once established | Toxic to pets |
| Green Moor Grass | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks during establishment; largely self-sufficient once established | Pet-safe |
| Green Panda Bamboo | Bright indirect light (just back from a sunny window) | Twice weekly during establishment and dry spells; weekly once established | Pet-safe |
| Green Sheen Japanese Spurge | Low light (north window or shaded room) | Weekly during the first two growing seasons; once established, water during prolonged dry spells only | Mildly toxic to pets |
| Green Velvet Boxwood | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Green-flowered Pitaya | Direct sun (at least 4-6 hours) | Every 2–4 weeks in spring and summer; essentially dry in winter | Mildly toxic to pets |
| Green-flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–12 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Green-spotted Billbergia | Bright indirect light (just back from a sunny window) | Keep central cup lightly filled; water substrate every 1-2 weeks | Pet-safe |
| Green-Spotted Neoregelia | Bright indirect light (just back from a sunny window) | Refresh central cup every 5–7 days; soil every 2–3 weeks | Pet-safe |
| Greene's Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during active growth (autumn–spring); very little to none in summer | Pet-safe |
| Greenspire Linden | Direct sun (at least 4-6 hours) | Moderate; deep watering during establishment and drought | Pet-safe |
| Greenstem Forsythia | Direct sun (at least 4-6 hours) | Weekly while establishing, then drought-tolerant | Pet-safe |
| Grefsheim Spirea | Direct sun (at least 4-6 hours) | Weekly until established; reduce to occasional watering in drought | Pet-safe |
| Greig's Tulip | Direct sun (at least 4-6 hours) | Rainfall-dependent during growth; needs dry summer dormancy | Toxic to pets |
| Grey Goldenrod | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Pet-safe |
| Grey Moor Grass | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Grey Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; drought-tolerant once established | Pet-safe |
| Grey sedge | Medium indirect light (a couple of metres from a window) | Occasional once established; more frequent in full sun or sandy soil | Pet-safe |
| Grey Speedwell | Direct sun (at least 4-6 hours) | Every 14–21 days during growing season; barely any in winter | Pet-safe |
| Grey-Headed Coneflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; drought-tolerant | Pet-safe |
| Grigua Cycad | Direct sun (at least 4-6 hours) | Every 21–30 days; very drought-tolerant | Toxic to pets |
| Groby's Specklinia | Medium indirect light (a couple of metres from a window) | Every 2–3 days; mounted plants every 1–2 days in warm conditions | Pet-safe |
| Ground Bromeliad | Bright indirect light (just back from a sunny window) | Occasional; drought-tolerant once established | Mildly toxic to pets |
| Guadua Bamboo | Direct sun (at least 4-6 hours) | Frequently during establishment; moderate once mature | Pet-safe |
| Guapeva | Direct sun (at least 4-6 hours) | Every 5–7 days when young; established trees tolerate short dry spells | Mildly toxic to pets |
| Guatemalan Ponytail Palm | Bright indirect light (just back from a sunny window) | Every 14–21 days in summer; every 28–42 days in winter | Mildly toxic to pets |
| Guava | Direct sun (at least 4-6 hours) | Deeply every 5-10 days; keep evenly moist during flowering and fruiting, then allow brief dry spells | Mildly toxic to pets |
| Gulf Muhly | Direct sun (at least 4-6 hours) | Water through the first season to establish, then only in drought, roughly every 2 weeks | Mildly toxic to pets |
| Gumbo Limbo | Direct sun (at least 4-6 hours) | Weekly when newly planted; once established, drought-tolerant and needs watering only during prolonged dry spells | Pet-safe |
| Gunnera manicata | Bright indirect light (just back from a sunny window) | Keep permanently wet; never let the rootzone dry | Mildly toxic to pets |
| Guppy's Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in active growth; every 3–4 weeks in winter | Pet-safe |
| Guzmania 'Orangeade' | Bright indirect light (just back from a sunny window) | Keep the central cup topped up; flush and refill every 1-2 weeks | Pet-safe |
| Guzmania monostachia | Bright indirect light (just back from a sunny window) | Maintain water in the central cup; flush and refill every 1-2 weeks | Pet-safe |
| Guzmania wittmackii | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Gymnocalycium andreae | Bright indirect light (just back from a sunny window) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Gymnocalycium denudatum | Bright indirect light (just back from a sunny window) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Gyoku-ryu Mondo Grass | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days in growth | Pet-safe |
| Gypsum Butterwort | Bright indirect light (just back from a sunny window) | Tray-water sparingly in summer; near-dry in winter dormancy | Mildly toxic to pets |
| H.E. Beale heather | Direct sun (at least 4-6 hours) | Weekly during first season; monthly or as needed once established | Pet-safe |
| Haage's Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; every 4–6 weeks in winter | Mildly toxic to pets |
| Hair sedge | Bright indirect light (just back from a sunny window) | Regular watering to maintain even moisture; reduce slightly in winter | Pet-safe |
| Hairy Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; once monthly or less in winter | Mildly toxic to pets |
| Hairy alumroot | Medium indirect light (a couple of metres from a window) | Once or twice per week during active growth; less in winter | Pet-safe |
| Hairy Beardtongue | Bright indirect light (just back from a sunny window) | Every 1–2 weeks once established; more frequent when newly planted | Pet-safe |
| Hairy Coreopsis | Direct sun (at least 4-6 hours) | Low to moderate; water during establishment, then as needed during drought | Pet-safe |
| Hairy Houseleek | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; once a month or less in winter | Pet-safe |
| Hairy Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season; sparingly in winter | Pet-safe |
| Hairy Lip Fern | Bright indirect light (just back from a sunny window) | every 2-3 weeks (drought-tolerant once established) | Mildly toxic to pets |
| Hairy Mallow | Direct sun (at least 4-6 hours) | Every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Hairy Parakohleria | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; reduce to every 10–14 days in cooler months | Pet-safe |
| Hairy Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow soil to nearly dry between waterings) | Pet-safe |
| Hairy Raphionacme | Bright indirect light (just back from a sunny window) | Weekly during active growth (spring–summer); virtually none in winter dormancy | Mildly toxic to pets |
| Hairy Rock Jasmine | Direct sun (at least 4-6 hours) | Sparingly; dry conditions preferred especially in winter | Pet-safe |
| Hairy Rock-cress | Direct sun (at least 4-6 hours) | Low; water only during prolonged drought | Mildly toxic to pets |
| Hairy Slipper Orchid | Medium indirect light (a couple of metres from a window) | Every 5–7 days year-round | Pet-safe |
| Hairy Solomon's Seal | Medium indirect light (a couple of metres from a window) | Regular; keep evenly moist | Mildly toxic to pets |
| Hairy St John's-wort | Medium indirect light (a couple of metres from a window) | Moderate — water when the top 2–3 cm of soil is dry | Toxic to pets |
| Hairy Stonecrop | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; minimal in winter | Pet-safe |
| Hairy Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Mildly toxic to pets |
| Hairy Woodrush | Low light (north window or shaded room) | Every 7–10 days during the growing season | Pet-safe |
| Hairy-Cupped Coelogyne | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; every 10–14 days in winter | Pet-safe |
| Hairy-fruited Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; very little in winter | Pet-safe |
| Hairy-leaf Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the active (cool) season; minimal or none in summer | Toxic to pets |
| Hairy-tongued Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; medium stays lightly moist | Pet-safe |
| Halesia carolina | Bright indirect light (just back from a sunny window) | Weekly while establishing; regular watering in dry spells | Pet-safe |
| Halesia monticola | Bright indirect light (just back from a sunny window) | Weekly while establishing; regular watering in dry spells | Pet-safe |
| Half-hidden Yam | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during the growing season; very sparingly or not at all during dormancy | Mildly toxic to pets |
| Half-Stained Sage | Direct sun (at least 4-6 hours) | Every 7–10 days in active growth; reduce in winter | Mildly toxic to pets |
| Hall's Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water in autumn (September–November) only; completely dry in winter and summer | Pet-safe |
| Hameln Dwarf Fountain Grass | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, about weekly while establishing; drought-tolerant once settled | Pet-safe |
| Hameln Fountain Grass | Direct sun (at least 4-6 hours) | Weekly for the first season; every 2 weeks once established | Pet-safe |
| Hamilton's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in autumn and winter | Pet-safe |
| Hammock Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season, every 10–14 days in winter | Pet-safe |
| Hand-Bearing Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Hansa Rose | Direct sun (at least 4-6 hours) | Water weekly while establishing; drought-tolerant once settled | Pet-safe |
| Happy Bean Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in spring/summer; every 4–6 weeks in winter | Pet-safe |
| Happy Wanderer | Bright indirect light (just back from a sunny window) | Low to moderate; drought tolerant once established | Mildly toxic to pets |
| Hard-leaf Primulina | Bright indirect light (just back from a sunny window) | Every 14–21 days in growing season; every 4 weeks in winter | Mildly toxic to pets |
| Hardy Chinese Windmill Palm | Direct sun (at least 4-6 hours) | Weekly while establishing; established garden plants need little extra water | Pet-safe |
| Hardy Geranium 'Rozanne' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; about weekly, more in heat or containers | Mildly toxic to pets |
| Hardy Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active growth; keep dry in winter | Mildly toxic to pets |
| Hare's Foot Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Harebell | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Pet-safe |
| Harlequin Flower | Direct sun (at least 4-6 hours) | Water freely when in active growth; stop completely once foliage yellows | Mildly toxic to pets |
| Hasse's Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); virtually none in summer | Pet-safe |
| Hatfieldii Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Haussknecht's Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season (spring–summer); every 4–6 weeks or rainfall-only in winter | Pet-safe |
| Haworth's Lampranthus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; sparingly in summer dormancy | Mildly toxic to pets |
| Haworthia | Bright indirect light (just back from a sunny window) | When the soil is dry, every 2-3 weeks | Pet-safe |
| Haworthia Bayeri | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Haworthia cooperi var. truncata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Pet-safe |
| Haworthia Emelyae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Herbacea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Lockwoodii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Magnifica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Mucronata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Pygmaea | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Haworthia Springbokvlakensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Tessellata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Venosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthiopsis Viscosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Heart of Flame Bromeliad | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 2–3 weeks in winter | Mildly toxic to pets |
| Heart-leaved Blechnum | Medium indirect light (a couple of metres from a window) | Twice a week in summer, once a week in cooler months | Pet-safe |
| Heart-leaved Globe Daisy | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; very sparingly in winter | Pet-safe |
| Heart-leaved Homalomena | Low light (north window or shaded room) | Every 10–14 days in growing season; every 14–21 days in winter | Toxic to pets |
| Heart-Lipped Brassavola | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; reduce to every 7–10 days in cooler months | Pet-safe |
| Heartleaf Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; reduce significantly in winter | Pet-safe |
| Heartleaf Foamflower | Medium indirect light (a couple of metres from a window) | Regular; keep consistently moist | Pet-safe |
| Heartleaf Golden Alexanders | Bright indirect light (just back from a sunny window) | Every 1–2 weeks once established; more frequently in the first season | Pet-safe |
| Heartleaf Hornbeam | Medium indirect light (a couple of metres from a window) | Moderate; water regularly when young; maintain consistent moisture | Pet-safe |
| Heath Speedwell | Bright indirect light (just back from a sunny window) | Low to moderate — allow soil to partially dry between waterings | Pet-safe |
| Heath-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Heath-leaved Sage | Direct sun (at least 4-6 hours) | Low; water deeply every 2–3 weeks when established | Mildly toxic to pets |
| Heather | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Pet-safe |
| Heavenly blue morning glory | Direct sun (at least 4-6 hours) | Once or twice a week in dry periods; reduce once established | Toxic to pets |
| Heavy Metal Switch Grass | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water deeply every 1-2 weeks while young | Mildly toxic to pets |
| Heavy Metal Switchgrass | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2–3 weeks once established | Pet-safe |
| Hechtia texensis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Hedera colchica 'Dentata Variegata' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-8 days in growth | Toxic to pets |
| Hedge Bamboo | Bright indirect light (just back from a sunny window) | 2-3 times per week; daily in summer heat or in containers | Pet-safe |
| Hedge bindweed | Direct sun (at least 4-6 hours) | Tolerates drought once established; water young plants weekly until roots are established | Mildly toxic to pets |
| Hedge Woundwort | Medium indirect light (a couple of metres from a window) | Regularly during active growth; reduce in winter | Mildly toxic to pets |
| Hedgehog Fescue | Direct sun (at least 4-6 hours) | Every 14–21 days when established; very sparingly in winter | Pet-safe |
| Hedgerow Cranesbill | Bright indirect light (just back from a sunny window) | Low to moderate; water only to establish, then drought-tolerant | Pet-safe |
| Heldreich's Sage | Direct sun (at least 4-6 hours) | Occasional; drought-tolerant once established | Pet-safe |
| Helenium 'Moerheim Beauty' | Direct sun (at least 4-6 hours) | Keep evenly moist; water every 4-7 days, more often in dry heat | Toxic to pets |
| Helenium 'Sahin's Early Flowerer' | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 4-7 days, more in heat | Toxic to pets |
| Helenium autumnale 'Pumilum Magnificum' | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil is dry, roughly every 4-7 days in summer | Mildly toxic to pets |
| Helianthus salicifolius | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm of soil is dry, roughly every 7-10 days; drought-tolerant once established | Pet-safe |
| Hellebore | Medium indirect light (a couple of metres from a window) | Weekly watering until established | Toxic to pets |
| Hellebore 'Penny's Pink' | Medium indirect light (a couple of metres from a window) | Keep evenly moist during establishment and dry spells; established clumps are moderately drought-tolerant | Toxic to pets |
| Helleborus × hybridus | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry; roughly weekly in the first year, then only in dry spells once established | Toxic to pets |
| Helleborus foetidus | Medium indirect light (a couple of metres from a window) | When the top few centimetres of soil dry out; weekly while establishing, then rarely once settled | Toxic to pets |
| Helleborus orientalis 'Ivory Prince' | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry; weekly while establishing, then during dry spells | Toxic to pets |
| Helleri Holly | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 7-14 days during dry weather | Toxic to pets |
| Helmet-Shaped Gongora | Bright indirect light (just back from a sunny window) | Every 4–6 days when actively growing; reduce to every 10–14 days in winter | Pet-safe |
| Henry's honeysuckle | Medium indirect light (a couple of metres from a window) | Weekly during dry periods; established plants are relatively drought-tolerant | Mildly toxic to pets |
| Henry's Lily | Medium indirect light (a couple of metres from a window) | When top 3–4 cm of soil feels dry | Toxic to pets |
| Henry's Lime | Bright indirect light (just back from a sunny window) | Weekly during establishment; deep watering every 2–3 weeks in dry periods | Pet-safe |
| Herald's Trumpet | Direct sun (at least 4-6 hours) | Every 5-7 days in growth, every 14 days in winter | Toxic to pets |
| Herb Robert | Medium indirect light (a couple of metres from a window) | Low to moderate; water only during prolonged dry spells | Pet-safe |
| Heritage River Birch | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the first 2 years; established trees prefer consistently moist soil | Pet-safe |
| Hermann's Pride Yellow Archangel | Medium indirect light (a couple of metres from a window) | Every 7–14 days during the growing season; reduce in winter | Mildly toxic to pets |
| Hernandez-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in autumn and winter | Pet-safe |
| Herrenhausen Oregano | Direct sun (at least 4-6 hours) | Every 10–14 days when established; more frequently for young plants | Pet-safe |
| Heucherella Brass Lantern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | Pet-safe |
| Heucherella Stoplight | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water deeply once or twice a week in dry spells | Pet-safe |
| Heucherella Sunrise Falls | Medium indirect light (a couple of metres from a window) | Keep evenly moist; in containers and baskets water more often, even daily in summer heat | Pet-safe |
| Heucherella Sweet Tea | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water deeply once or twice a week in dry weather | Pet-safe |
| Heuffel's Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; rarely in winter | Pet-safe |
| Hiba Arborvitae | Bright indirect light (just back from a sunny window) | Every 5–10 days; never allow soil to dry out completely | Mildly toxic to pets |
| Hibiscus syriacus 'Aphrodite' | Direct sun (at least 4-6 hours) | Weekly while establishing; every 10-14 days once mature unless rainfall is sparse | Pet-safe |
| Hibiscus syriacus 'Blue Bird' | Direct sun (at least 4-6 hours) | Water weekly during the first two seasons and in summer droughts; established plants are moderately drought-tolerant | Pet-safe |
| Hibiscus syriacus 'Helene' | Direct sun (at least 4-6 hours) | Water weekly while establishing and during summer drought; moderately drought-tolerant once mature | Pet-safe |
| Hibiscus syriacus 'Minerva' | Direct sun (at least 4-6 hours) | Water weekly during establishment and summer drought; moderately drought-tolerant once established | Pet-safe |
| Hicksii Yew | Medium indirect light (a couple of metres from a window) | Every 7-10 days while establishing, then as needed | Toxic to pets |
| Highland Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep the media lightly moist at all times; water roughly every 2-4 days indoors, never letting it dry out fully. | Mildly toxic to pets |
| Hikuri | Direct sun (at least 4-6 hours) | Sparingly: only when soil is fully dry, roughly every 2-3 weeks in summer, none in winter | Toxic to pets |
| Hildebrands Basket Vine | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of the potting mix has dried out, roughly every 5–8 days in summer | Pet-safe |
| Hill Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Hillii Staghorn Fern | Bright indirect light (just back from a sunny window) | Soak when the mount is nearly dry, roughly weekly in summer and every 2-3 weeks in winter | Pet-safe |
| Himalayan Cassiope | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water before the top 2 cm of growing medium dries out. | Mildly toxic to pets |
| Himalayan Cypress | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in dry spells | Mildly toxic to pets |
| Himalayan Pieris Wakehurst | Bright indirect light (just back from a sunny window) | Water every 7–10 days; do not allow to dry out, particularly during spring growth flush | Toxic to pets |
| Himalayan Yew | Medium indirect light (a couple of metres from a window) | Weekly during establishment; every 1–2 weeks once established | Toxic to pets |
| Hinds' Torchwood | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; very rarely in winter dormancy | Mildly toxic to pets |
| Hindu rope plant | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days in growth | Pet-safe |
| Hindu Rope Plant | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of compost is dry, roughly every 10-14 days in summer | Pet-safe |
| Hindu Rope Plant | Bright indirect light (just back from a sunny window) | When the mix is mostly dry, every 10-14 days or longer | Pet-safe |
| Hinoki Cypress Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil begins to dry, often daily in summer | Mildly toxic to pets |
| Hoary Plantain | Direct sun (at least 4-6 hours) | Rarely; established plants are drought-tolerant | Pet-safe |
| Hobbit Jade | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is fully dry, about every 2-3 weeks; less in winter | Toxic to pets |
| Hogweed | Bright indirect light (just back from a sunny window) | Regular during establishment; drought-tolerant once established | Mildly toxic to pets |
| Holger Juniper | Direct sun (at least 4-6 hours) | Water regularly the first season; afterward only in extended drought | Toxic to pets |
| Holger's Juniper | Direct sun (at least 4-6 hours) | Low — water deeply but infrequently once established | Mildly toxic to pets |
| Hollow Joe Pye Weed | Direct sun (at least 4-6 hours) | Keep soil reliably moist; water weekly or more during dry weather | Pet-safe |
| Hollow-Corolla Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–20 days in summer, very sparingly in winter | Pet-safe |
| Hollow-Rooted Fumewort | Medium indirect light (a couple of metres from a window) | Rainfall-dependent during spring growth; completely dry in summer dormancy | Toxic to pets |
| Holly Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Hollyhock | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce in autumn and winter | Pet-safe |
| Holmstrup Arborvitae | Direct sun (at least 4-6 hours) | Two to three times weekly when young; weekly once established | Mildly toxic to pets |
| Homalomena Sp. Selby | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Honey Garlic | Bright indirect light (just back from a sunny window) | Low; rainfall usually sufficient once established in the UK | Toxic to pets |
| Hooded Maxillaria | Medium indirect light (a couple of metres from a window) | Every 5–7 days year-round; slight reduction in winter | Pet-safe |
| Hooded-leaf Pelargonium | Direct sun (at least 4-6 hours) | Water when the top 3–4 cm of compost is dry, approximately every 7–12 days in the growing season; keep barely moist in winter | Toxic to pets |
| Hoodia gordonii | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in summer; keep nearly dry October-March | Mildly toxic to pets |
| Hoodia parviflora | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Hook Sedge | Direct sun (at least 4-6 hours) | Keep evenly moist; water weekly in dry spells and don't let containers fully dry | Mildly toxic to pets |
| Hooker's Anchomanes | Medium indirect light (a couple of metres from a window) | Every 7–10 days during growth; completely dry during dormancy | Toxic to pets |
| Hooker's Inula | Bright indirect light (just back from a sunny window) | 2 times per week; tolerates periodic damp conditions | Pet-safe |
| Hoop Pine | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Hoopsii Blue Spruce | Direct sun (at least 4-6 hours) | Water deeply weekly for the first two to three years, then only in extended dry spells | Mildly toxic to pets |
| Hope's Cycad | Bright indirect light (just back from a sunny window) | Weekly in summer; every 10–14 days in winter | Toxic to pets |
| Horned violet | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep evenly moist | Pet-safe |
| Horombe Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; none from late autumn to mid-spring | Toxic to pets |
| Horseshoe Vetch | Direct sun (at least 4-6 hours) | Rarely — established plants are very drought-tolerant | Mildly toxic to pets |
| Hosta | Medium indirect light (a couple of metres from a window) | Keep evenly moist; roughly weekly in the ground, more often in pots or heat | Toxic to pets |
| Hosta 'Patriot' | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Hound's Tongue Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of mix begins to dry, roughly every 7-10 days | Mildly toxic to pets |
| Hound's-tongue | Direct sun (at least 4-6 hours) | Rarely, once established | Toxic to pets |
| Houseleek Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Pet-safe |
| Houseleek Saxifrage | Bright indirect light (just back from a sunny window) | Low — water sparingly at all times; near-dry in summer and winter | Pet-safe |
| Houttuynia cordata 'Chameleon' | Direct sun (at least 4-6 hours) | Keep soil constantly wet to waterlogged; never allow it to dry | Mildly toxic to pets |
| Hoya | Bright indirect light (just back from a sunny window) | When the soil is mostly dry, every 10-14 days | Pet-safe |
| Hoya 'Mathilde' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya Australis | Bright indirect light (just back from a sunny window) | when top 2-3 cm of soil dries | Pet-safe |
| Hoya Bella | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Bella 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-9 days in growth | Pet-safe |
| Hoya Bilobata | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; about every 2 weeks in winter | Pet-safe |
| Hoya Cagayanensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Carnosa 'Rubra' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya caudata (Sumatra) | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in growth; every 2-3 weeks in winter | Pet-safe |
| Hoya Compacta | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Hoya Compacta 'Regalis' | Bright indirect light (just back from a sunny window) | When the mix is dry to 4-5 cm down, about every 10-14 days | Pet-safe |
| Hoya Coriacea | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya curtisii | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; every 10-14 days in autumn and winter | Pet-safe |
| Hoya Davidcummingii | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days | Pet-safe |
| Hoya Diptera | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of the mix is dry, roughly every 6-10 days in growth | Pet-safe |
| Hoya Engleriana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 6-9 days in growth | Pet-safe |
| Hoya Flagellata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Gracilis | Bright indirect light (just back from a sunny window) | When the mix is nearly or fully dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Greenii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya heuschkeliana | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Incrassata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Lambii | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Linearis | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Meliflua | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Memoria (Gracilis) | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring/summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Mitrata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Neoguineensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Onychoides | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Pachyclada | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Pallida | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-9 days in growth | Pet-safe |
| Hoya Parviflora | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Patella | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-9 days in growth | Pet-safe |
| Hoya Paxtonii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Pentaphlebia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Picta | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya polyneura (Fishtail Hoya) | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Pubescens | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Pubicalyx 'Black Dragon' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Pubicalyx 'Pink Silver' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, about every 7-12 days in growth | Pet-safe |
| Hoya Pubicalyx 'Red Buttons' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, about every 7-12 days in growth | Pet-safe |
| Hoya Pubicalyx 'Royal Hawaiian Purple' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Pubicalyx 'Silver Pink' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Rebecca | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of the mix is dry, roughly every 6-10 days in growth | Pet-safe |
| Hoya Rigida | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Rosita | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Hoya Scortechinii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya sigillatis | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 1-2 inches (3-5 cm) of mix dry out first | Pet-safe |
| Hoya Siikfongensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Spartioides | Bright indirect light (just back from a sunny window) | When the mix is nearly dry throughout, roughly every 12-18 days | Pet-safe |
| Hoya Sunrise | Bright indirect light (just back from a sunny window) | When the top of the mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Surigaoensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days | Pet-safe |
| Hoya Vitellinoides | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Vitiensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Huernia brevirostris | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| Huernia hystrix | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; nearly dry in winter | Mildly toxic to pets |
| Huernia keniensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Huernia schneideriana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Mildly toxic to pets |
| Huernia thuretii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Huernia zebrina | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| Humulus lupulus 'Aureus' | Direct sun (at least 4-6 hours) | Keep soil reliably moist in the growing season, about every 3-5 days in summer | Toxic to pets |
| Hungarian Barren Strawberry | Medium indirect light (a couple of metres from a window) | Low; drought-tolerant once established | Pet-safe |
| Hungarian Oak | Direct sun (at least 4-6 hours) | Establish with regular watering in year 1–2; highly drought-tolerant once established | Mildly toxic to pets |
| Huron Sunrise Miscanthus | Direct sun (at least 4-6 hours) | Weekly in the establishment year; thereafter only during prolonged drought | Mildly toxic to pets |
| Hybrid mandevilla | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer; every 10–14 days in winter | Mildly toxic to pets |
| Hybrid trumpet vine | Direct sun (at least 4-6 hours) | Weekly during establishment; established plants are drought-tolerant | Mildly toxic to pets |
| Hydrangea 'Annabelle' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 2-3 times weekly in summer, more in heat or drought | Toxic to pets |
| Hydrangea 'Limelight' | Direct sun (at least 4-6 hours) | Keep soil moist while establishing; water deeply once or twice weekly in summer, less once established | Toxic to pets |
| Hydrangea 'Little Lime' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, about 1-2 times per week | Toxic to pets |
| Hydrangea 'PeeWee' | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, about once per week | Toxic to pets |
| Hydrangea 'Pinky Winky' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, about 1-2 times per week | Toxic to pets |
| Hydrangea 'Vanilla Strawberry' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly 1-2 times per week | Toxic to pets |
| Hydrangea aspera 'Villosa' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply every 5-7 days in dry summer spells | Toxic to pets |
| Hylotelephium 'Autumn Joy' | Direct sun (at least 4-6 hours) | Roughly every 10-14 days in its first season; established plants rarely need watering | Pet-safe |
| Hylotelephium 'Purple Emperor' | Direct sun (at least 4-6 hours) | Every 10-14 days when young; established plants need little to no watering | Pet-safe |
| Hylotelephium spectabile 'Brilliant' | Direct sun (at least 4-6 hours) | Every 10-14 days while establishing; mature clumps rely on rainfall | Pet-safe |
| Hylotelephium telephium 'Munstead Dark Red' | Direct sun (at least 4-6 hours) | Every 10-14 days while establishing; mature plants are largely self-reliant | Pet-safe |
| Hypoestes phyllostachya 'Carmina' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Confetti Pink' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Splash Select Pink' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Splash Select White' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Wit' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Iara's Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; almost none during dormancy | Mildly toxic to pets |
| Iberian Cranesbill | Bright indirect light (just back from a sunny window) | Weekly in spring and summer; occasional in autumn | Pet-safe |
| Ice Cream Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil dries, every 2-4 days in warm growth | Pet-safe |
| Ice Dance Japanese Sedge | Low light (north window or shaded room) | Every 7-10 days or when the top 3-4 cm of soil is dry | Pet-safe |
| Ice Dance Sedge | Medium indirect light (a couple of metres from a window) | Keep moist while establishing; water deeply weekly in dry spells | Mildly toxic to pets |
| Ice Plant | Direct sun (at least 4-6 hours) | Every 10-14 days during establishment; mature clumps rely on rainfall | Pet-safe |
| Iceberg Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Idaho fescue | Direct sun (at least 4-6 hours) | Very low; water every 2–3 weeks during the first season; monthly or less once established | Pet-safe |
| Illinois Tick Trefoil | Direct sun (at least 4-6 hours) | Deep watering every 10–14 days during the first growing season; drought-tolerant once established | Pet-safe |
| Illumination Periwinkle | Bright indirect light (just back from a sunny window) | Once or twice weekly; more frequently in containers or hot weather | Toxic to pets |
| Imbricate Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days; do not allow compost to dry out | Pet-safe |
| Imbricate Sword Fern | Low light (north window or shaded room) | Every 5–7 days in summer, every 10–14 days in winter | Pet-safe |
| Immersed Stelis | Medium indirect light (a couple of metres from a window) | Daily misting for mounted specimens; every 2 days for potted plants | Pet-safe |
| Impatiens balsamina | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Imperial Bromeliad | Direct sun (at least 4-6 hours) | Water sparingly; allow potting medium to almost completely dry between waterings | Pet-safe |
| Incense Cedar | Direct sun (at least 4-6 hours) | Every 7–10 days when young; established trees are drought-tolerant and rely mainly on rainfall | Mildly toxic to pets |
| Inch Plant | Bright indirect light (just back from a sunny window) | Roughly weekly in summer; every 10-14 days in winter | Toxic to pets |
| Indian Blanket | Direct sun (at least 4-6 hours) | Every 1–2 weeks; drought-tolerant once established | Pet-safe |
| Indian Cucumber Root | Low light (north window or shaded room) | Consistently moist; water whenever the top 2–3 cm of soil begins to dry during the growing season | Mildly toxic to pets |
| Indian Gooseberry | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-10 days in growth | Mildly toxic to pets |
| indian grass | Direct sun (at least 4-6 hours) | Rarely once established; water during the first growing season to aid establishment | Pet-safe |
| Indian Sinocrassula | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; monthly or less in winter | Mildly toxic to pets |
| Indian Summer black-eyed Susan | Direct sun (at least 4-6 hours) | Weekly; allow the top 2–3 cm of soil to dry slightly between waterings | Pet-safe |
| Indian Timber Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during the growing season; reduce in winter | Pet-safe |
| Inflated Rock Rose | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly in the first season | Mildly toxic to pets |
| Intense Blue Fescue | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; minimal once established | Mildly toxic to pets |
| Intermediate Galangal | Medium indirect light (a couple of metres from a window) | Twice a week in warm months; once a week or less in cooler conditions | Mildly toxic to pets |
| Intermediate Polypody | Medium indirect light (a couple of metres from a window) | Every 7–10 days in active growth (autumn–spring); reduce to every 2–3 weeks in summer | Pet-safe |
| Interrupted Sage | Direct sun (at least 4-6 hours) | Every 7–14 days in summer; very sparingly in winter | Mildly toxic to pets |
| Ipomoea batatas 'Blackie' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often every 2-3 days in containers in summer | Toxic to pets |
| Ipomoea quamoclit | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 4-6 days in summer | Toxic to pets |
| Ipomoea tricolor 'Heavenly Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days in warm weather | Toxic to pets |
| Irene Nuss Cane Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 5-7 days in summer | Toxic to pets |
| Iridescent Bamboo | Direct sun (at least 4-6 hours) | Twice weekly in spring and summer; weekly in autumn; fortnightly in winter | Pet-safe |
| Iris | Direct sun (at least 4-6 hours) | Weekly watering during growth | Toxic to pets |
| Iris 'Benton Susan' | Direct sun (at least 4-6 hours) | Water at planting and during establishment, then only in prolonged drought; established clumps are drought-tolerant | Toxic to pets |
| Iris 'Black Gamecock' | Direct sun (at least 4-6 hours) | Keep consistently wet; tolerates standing water and never fully dry out | Toxic to pets |
| Iris 'Jane Phillips' | Direct sun (at least 4-6 hours) | Water deeply during spring growth and after planting; keep drier in summer | Toxic to pets |
| Irish Fleabane | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season; less in winter | Mildly toxic to pets |
| Irish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Irish Heath Irish Dusk | Direct sun (at least 4-6 hours) | Regular during establishment; moderate once settled | Mildly toxic to pets |
| Isabel Chan's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in winter | Pet-safe |
| Isalo Adenia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; withhold almost entirely in winter | Toxic to pets |
| Island Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in active season (October–April); none to minimal in summer | Pet-safe |
| Italian aster | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; drought-tolerant in summer | Pet-safe |
| Italian Cypress | Direct sun (at least 4-6 hours) | Every 1-2 weeks while establishing, then minimal | Mildly toxic to pets |
| Italian jasmine | Bright indirect light (just back from a sunny window) | Every 7–14 days; drought-tolerant once established | Mildly toxic to pets |
| Italian Sage Phlomis | Direct sun (at least 4-6 hours) | Low — once every 2–3 weeks once established | Mildly toxic to pets |
| Itea virginica | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry spells, tolerant of wet ground | Mildly toxic to pets |
| Itea virginica 'Henry's Garnet' | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry weather, tolerant of wet ground | Mildly toxic to pets |
| Itea virginica 'Little Henry' | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry spells, tolerant of wet ground | Mildly toxic to pets |
| Itoh Peony 'Bartzella' | Direct sun (at least 4-6 hours) | Deeply once a week during growth and budding; established plants tolerate short dry spells | Toxic to pets |
| Itsy Bitsy Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Ivory Tree | Bright indirect light (just back from a sunny window) | Every 4–7 days; allow topsoil to dry slightly between waterings | Toxic to pets |
| Ivy-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn/winter | Pet-safe |
| Ivy-Leaved Cyclamen | Medium indirect light (a couple of metres from a window) | Drought-tolerant once established; rely entirely on natural rainfall | Toxic to pets |
| Jaboticaba | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep consistently moist but not waterlogged | Pet-safe |
| Jack-in-the-Pulpit | Low light (north window or shaded room) | Keep the soil consistently moist throughout the growing season, watering whenever the surface begins to dry; it tolerates short dry spells but resents drought. | Toxic to pets |
| Jackfruit | Direct sun (at least 4-6 hours) | Deeply every 5-10 days; keep young trees evenly moist, with a drier spell tolerated by established trees | Mildly toxic to pets |
| Jade plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| Jagged Lavender | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–4 weeks in winter | Toxic to pets |
| Jalisco Mountain Air Plant | Bright indirect light (just back from a sunny window) | Mist or dunk every 2–3 days in hot weather; once a week in cool, humid conditions. | Mildly toxic to pets |
| Jamaican Tall Coconut | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in heat, never drying out fully | Pet-safe |
| Janke's Gesneriad | Medium indirect light (a couple of metres from a window) | Water at the root zone only when the soil approaches dryness, roughly every 10–14 days in the growing season | Mildly toxic to pets |
| Japanese Arborvitae | Direct sun (at least 4-6 hours) | Regular — keep soil evenly moist; do not allow to dry out completely | Pet-safe |
| Japanese astilbe | Medium indirect light (a couple of metres from a window) | Twice per week in active growth; weekly in cooler seasons | Pet-safe |
| Japanese barberry | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; drought-tolerant once established | Mildly toxic to pets |
| Japanese Beech | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil begins to dry, often daily in summer | Mildly toxic to pets |
| Japanese Big-Leaf Magnolia | Bright indirect light (just back from a sunny window) | Weekly during dry periods; established trees are moderately drought-tolerant | Pet-safe |
| Japanese Black Pine 'Kotobuki' | Direct sun (at least 4-6 hours) | When the soil surface is approaching dry, then water thoroughly | Mildly toxic to pets |
| Japanese box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Japanese Brake Fern | Medium indirect light (a couple of metres from a window) | Every 4–6 days in the growing season; every 7–10 days in winter | Pet-safe |
| Japanese Camellia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist in late summer | Pet-safe |
| Japanese Camellia 'Nuccio's Pearl' | Bright indirect light (just back from a sunny window) | About weekly, more in heat and during budding; water when the top 3-5 cm of soil is dry | Pet-safe |
| Japanese Catmint | Medium indirect light (a couple of metres from a window) | Every 5–7 days; do not allow to dry out completely | Pet-safe |
| Japanese Cedar 'Cristata' | Direct sun (at least 4-6 hours) | Keep evenly moist; weekly in dry spells, more for young plants | Mildly toxic to pets |
| Japanese Cedar 'Elegans' | Direct sun (at least 4-6 hours) | Keep evenly moist; water weekly in dry spells, more for young plants | Mildly toxic to pets |
| Japanese Cedar 'Spiralis' | Direct sun (at least 4-6 hours) | Keep evenly moist; weekly in dry weather, more for young or potted plants | Mildly toxic to pets |
| Japanese Chain Fern | Medium indirect light (a couple of metres from a window) | Every 4–6 days in summer, every 8–12 days in winter | Pet-safe |
| Japanese Cornel Dogwood | Direct sun (at least 4-6 hours) | Regular watering while establishing; drought-tolerant once mature | Pet-safe |
| Japanese Dunce Cap | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; reduce significantly in winter dormancy | Pet-safe |
| Japanese Fairy Bells | Medium indirect light (a couple of metres from a window) | Regular; keep soil evenly moist throughout the growing season. | Mildly toxic to pets |
| Japanese False Spleenwort | Medium indirect light (a couple of metres from a window) | Every 3–5 days in growing season; reduce slightly in winter | Mildly toxic to pets |
| Japanese Holly Fern | Low light (north window or shaded room) | Every 7–10 days; allow top 2–3 cm of soil to dry between waterings | Pet-safe |
| Japanese kerria | Medium indirect light (a couple of metres from a window) | Weekly during establishment; drought-tolerant once established | Mildly toxic to pets |
| Japanese Larch | Direct sun (at least 4-6 hours) | When the surface just begins to dry, often once or twice daily in summer | Mildly toxic to pets |
| Japanese Maple 'Bloodgood' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply in dry spells | Mildly toxic to pets |
| Japanese Maple 'Crimson Queen' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, about weekly and more in heat or pots | Mildly toxic to pets |
| Japanese Maple 'Dissectum' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, often weekly in summer | Pet-safe |
| Japanese Maple 'Osakazuki' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, around weekly in dry weather | Pet-safe |
| Japanese Maple 'Sango Kaku' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly weekly in dry spells | Pet-safe |
| Japanese Mazus | Direct sun (at least 4-6 hours) | Every 3–5 days; prefers moist, consistently watered soil | Mildly toxic to pets |
| Japanese Nutmeg Yew | Medium indirect light (a couple of metres from a window) | Every 7–10 days when establishing; established trees rely on rainfall with supplemental watering in dry spells | Mildly toxic to pets |
| Japanese Pieris | Bright indirect light (just back from a sunny window) | Keep evenly moist; water weekly in dry spells and never let it dry out | Toxic to pets |
| Japanese Plum Yew | Medium indirect light (a couple of metres from a window) | Keep evenly moist; weekly in dry spells, more while establishing | Mildly toxic to pets |
| Japanese Privet Bonsai | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil dries, often daily in summer | Toxic to pets |
| Japanese Rose | Direct sun (at least 4-6 hours) | Weekly while young, then drought-tolerant once established | Pet-safe |
| Japanese Shield Fern | Medium indirect light (a couple of metres from a window) | Regular; keep soil evenly moist | Pet-safe |
| Japanese Spirea | Direct sun (at least 4-6 hours) | Once per week while establishing; drought-tolerant when established | Pet-safe |
| Japanese Spirea 'Anthony Waterer' | Direct sun (at least 4-6 hours) | Weekly during the first season, then only in prolonged dry spells | Mildly toxic to pets |
| Japanese Spirea 'Goldflame' | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry, about weekly while establishing | Pet-safe |
| Japanese Spurge | Low light (north window or shaded room) | Weekly during establishment (first two growing seasons); monthly or during dry spells once established | Mildly toxic to pets |
| Japanese Tassel Fern | Medium indirect light (a couple of metres from a window) | Regular; maintain consistent moisture | Pet-safe |
| Japanese Timber Bamboo | Direct sun (at least 4-6 hours) | Frequent during establishment; moderate once established | Pet-safe |
| Japanese Tree Lilac | Direct sun (at least 4-6 hours) | Weekly while young, then only in drought | Mildly toxic to pets |
| Japanese Tree Lilac 'Ivory Silk' | Direct sun (at least 4-6 hours) | Weekly deep soakings for the first two years, then during droughts | Pet-safe |
| Japanese Umbrella Pine | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly weekly while young, less once established | Mildly toxic to pets |
| Japanese White Pine | Direct sun (at least 4-6 hours) | Water only when the soil surface has begun to dry; pines prefer a slightly drier regime | Mildly toxic to pets |
| Japanese White Pine 'Glauca' | Direct sun (at least 4-6 hours) | Water young trees weekly in dry weather; established trees seldom | Mildly toxic to pets |
| Jasminum beesianum | Direct sun (at least 4-6 hours) | Keep evenly moist while establishing; water in prolonged dry spells once mature | Pet-safe |
| Jasminum mesnyi | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Jasminum nudiflorum | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry out, about every 7-10 days while establishing | Pet-safe |
| Java Plum | Direct sun (at least 4-6 hours) | Water regularly when young; established trees are drought-tolerant and flood-tolerant. | Pet-safe |
| Javanese Ixora | Bright indirect light (just back from a sunny window) | Every 5–7 days; maintain consistent moisture throughout the growing season | Mildly toxic to pets |
| Jean's Dilly Spruce | Bright indirect light (just back from a sunny window) | Regular; do not allow to dry out completely, especially in warm weather | Pet-safe |
| Jelena witch hazel | Bright indirect light (just back from a sunny window) | Regularly during establishment; thereafter water during summer dry spells | Mildly toxic to pets |
| Jelly Bean Plant | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Jelly Bean Plant (Pork and Beans) | Bright indirect light (just back from a sunny window) | Every 10-14 days in spring and summer; roughly monthly or less in winter | Mildly toxic to pets |
| Jenkins Fan Palm | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil feels dry | Pet-safe |
| Jerusalem Sage | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water deeply once every 2–3 weeks in the first growing season, then rely on rainfall in most UK and Mediterranean-climate US regions. | Mildly toxic to pets |
| Jewel Orchid | Bright indirect light (just back from a sunny window) | Every 7-10 days; keep the mix evenly moist, never bone dry | Pet-safe |
| Joe-Pye Weed | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in dry weather | Toxic to pets |
| Johann's Neoregelia | Bright indirect light (just back from a sunny window) | Top up central cup every 5–7 days; soil every 2–3 weeks | Pet-safe |
| Johannes Cape Primrose | Medium indirect light (a couple of metres from a window) | Every 5-8 days in active growth; every 2-3 weeks in winter | Pet-safe |
| Johnston's Cyrtosperma | Bright indirect light (just back from a sunny window) | Keep permanently moist to waterlogged; does not tolerate drought | Toxic to pets |
| Jonquil | Direct sun (at least 4-6 hours) | Moderate during autumn–spring growth; very dry during summer dormancy | Toxic to pets |
| Joseph's coat | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Mildly toxic to pets |
| Joseph's Coat Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Joseph's Lepanthes | Medium indirect light (a couple of metres from a window) | Every 7–10 days (potted); near-daily misting if mounted | Pet-safe |
| Josephine's Lily | Direct sun (at least 4-6 hours) | Water from flower-scape emergence (late summer) through leaf period (winter–spring); completely dry from late spring to late summer | Toxic to pets |
| Jubilee Celebration Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Jujube | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, every 1-2 weeks once established | Mildly toxic to pets |
| Juniper Bonsai | Direct sun (at least 4-6 hours) | When the top of the soil begins to dry, often daily in hot weather | Mildly toxic to pets |
| Juniper-leaved Thrift | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; very sparingly in winter | Pet-safe |
| Juno Iris | Direct sun (at least 4-6 hours) | Moderate from early spring to late spring; completely dry mid-summer to mid-autumn | Toxic to pets |
| Jupiter's Distaff | Medium indirect light (a couple of metres from a window) | Regularly in dry spells, especially in sun | Pet-safe |
| Kacip Fatimah | Low light (north window or shaded room) | Water when the top 1–2 cm of soil begins to dry; typically every 4–6 days in warm conditions | Mildly toxic to pets |
| Kalanchoe | Direct sun (at least 4-6 hours) | When the soil is dry, every 10-14 days | Toxic to pets |
| Kalanchoe 'Kerinci' | Bright indirect light (just back from a sunny window) | When the soil is dry to about halfway down, every 10-14 days | Toxic to pets |
| Kalanchoe Beharensis | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Eriophylla | Bright indirect light (just back from a sunny window) | When the soil is dry to a depth of 3-4 cm, roughly every 10-14 days in growth | Toxic to pets |
| Kalanchoe Fedtschenkoi | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, about every 1-2 weeks in summer, every 3-4 weeks in winter | Toxic to pets |
| Kalanchoe Longiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Kalanchoe Marmorata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 2-3 weeks in winter | Toxic to pets |
| Kalanchoe Millotii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Kalanchoe Orgyalis | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Rhombopilosa | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Synsepala | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Kalanchoe Thyrsiflora | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Kalanchoe Tomentosa 'Chocolate Soldier' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kamchatka Bugbane | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; weekly when dormant | Mildly toxic to pets |
| Kangaroo Vine | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Pet-safe |
| Karl Foerster Feather Reed Grass | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, roughly weekly; tolerant of occasional wet ground | Pet-safe |
| Karl Foerster Feather Reed Grass | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks once established | Pet-safe |
| Karley Rose Oriental Fountain Grass | Direct sun (at least 4-6 hours) | Weekly in the first season, then moderate watering during dry periods | Pet-safe |
| Karoo Cycad | Direct sun (at least 4-6 hours) | Every 21–30 days; highly drought-tolerant once established | Toxic to pets |
| Kashmir Cypress | Direct sun (at least 4-6 hours) | Regularly; moist but well-drained | Mildly toxic to pets |
| Kashmir rowan | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Mildly toxic to pets |
| Kauri | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring/summer; reduce to every 10–14 days in winter | Pet-safe |
| Keisk's Leucothoe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; sensitive to both drought and waterlogging | Toxic to pets |
| Kellerman's Begonia | Bright indirect light (just back from a sunny window) | When the top third of the soil is dry | Toxic to pets |
| Kenneally's Sundew | Bright indirect light (just back from a sunny window) | Standing tray (growing season); minimal (dry rest) | Pet-safe |
| Kentia palm | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 10-14 days | Pet-safe |
| Kentucky wisteria | Direct sun (at least 4-6 hours) | Weekly during the first growing season; drought-tolerant once established | Toxic to pets |
| Keteleeria davidiana | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing; established trees rely largely on rainfall with watering in drought | Mildly toxic to pets |
| Khimp | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Mildly toxic to pets |
| Khirni | Direct sun (at least 4-6 hours) | Every 7–14 days when young; drought-tolerant once established | Pet-safe |
| Kidney Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days during active growth; every 6–8 days in winter | Pet-safe |
| Kidney Vetch | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Kiftsgate Rose | Direct sun (at least 4-6 hours) | Deep weekly soak while establishing; little needed once mature | Pet-safe |
| King Billy Pine | Bright indirect light (just back from a sunny window) | Keep consistently moist at all times; never allow to dry out, watering deeply in any dry spell | Mildly toxic to pets |
| King George aster | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; rarely needs irrigation in UK climates | Pet-safe |
| King of Hearts Bleeding Heart | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Toxic to pets |
| King Size Scarlet everlasting | Direct sun (at least 4-6 hours) | Every 7–10 days; water deeply then let soil partially dry | Pet-safe |
| Kitten Tails | Medium indirect light (a couple of metres from a window) | Infrequently; dry to medium-dry | Mildly toxic to pets |
| Kiwano | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm dries, often every 2-4 days in heat | Mildly toxic to pets |
| Kloss's Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep medium evenly moist; water every 2–4 days | Mildly toxic to pets |
| Knap Hill Scarlet quince | Bright indirect light (just back from a sunny window) | Weekly when establishing; monthly once established | Mildly toxic to pets |
| Knautia macedonica | Direct sun (at least 4-6 hours) | When the top few centimetres are dry; roughly weekly while establishing | Mildly toxic to pets |
| Kniphofia 'Alcazar' | Direct sun (at least 4-6 hours) | Weekly while establishing and during summer drought; minimal once mature | Pet-safe |
| Kniphofia 'Bees' Sunset' | Direct sun (at least 4-6 hours) | Weekly while establishing and during drought; little once mature | Pet-safe |
| Kniphofia 'Little Maid' | Direct sun (at least 4-6 hours) | Weekly while establishing and in summer drought; sparing once settled | Pet-safe |
| Kniphofia 'Tawny King' | Direct sun (at least 4-6 hours) | Weekly during the first season and in summer drought; established clumps need little once settled | Pet-safe |
| Kniphofia triangularis | Direct sun (at least 4-6 hours) | Every 10-14 days once established, when soil is dry | Pet-safe |
| Kniphofia uvaria | Direct sun (at least 4-6 hours) | Water regularly through the first season, then mainly in summer dry spells once established | Pet-safe |
| Knotted Clover | Direct sun (at least 4-6 hours) | Low; drought-tolerant | Pet-safe |
| Knotweed Begonia | Bright indirect light (just back from a sunny window) | Every 5–8 days in the growing season; every 10–14 days in winter | Toxic to pets |
| Kobus Magnolia | Direct sun (at least 4-6 hours) | Weekly when establishing; once established, natural rainfall is often sufficient except during prolonged drought | Pet-safe |
| Koehne's rowan | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Mildly toxic to pets |
| Koelreuteria paniculata | Direct sun (at least 4-6 hours) | Weekly for the first 1-2 years; minimal once established | Mildly toxic to pets |
| Kolkwitzia amabilis | Direct sun (at least 4-6 hours) | Weekly while establishing, then in dry spells | Mildly toxic to pets |
| Kolkwitzia amabilis 'Pink Cloud' | Direct sun (at least 4-6 hours) | Weekly during the first two growing seasons; established plants only in prolonged drought | Mildly toxic to pets |
| Korean Angelica | Medium indirect light (a couple of metres from a window) | 2-3 times per week in active growth; reduce in winter | Mildly toxic to pets |
| Korean Arborvitae | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 1–2 weeks once established | Mildly toxic to pets |
| Korean box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Korean feather reed grass | Bright indirect light (just back from a sunny window) | Water deeply 1-2 times weekly; keep soil consistently moist but not waterlogged | Pet-safe |
| Korean Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; moderately drought-tolerant once mature | Pet-safe |
| Korean rhododendron | Bright indirect light (just back from a sunny window) | Weekly during establishment and summer; reduce to monthly when dormant | Toxic to pets |
| Korean Spice Viburnum | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry, about weekly while establishing | Pet-safe |
| Korlan | Direct sun (at least 4-6 hours) | Every 4–6 days for young trees; reduce to every 10–14 days once established in seasonally wet climates | Mildly toxic to pets |
| Kotschy's Crambe | Bright indirect light (just back from a sunny window) | Moderate — water during dry spells, especially in the establishment year | Mildly toxic to pets |
| Kousa Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering while establishing | Pet-safe |
| Kucynjak's Columnea | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Kuma Bamboo Grass | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season, reduce in winter | Pet-safe |
| Kupper's Werauhia | Bright indirect light (just back from a sunny window) | Refill tank weekly; water substrate every 1-2 weeks when top layer is dry | Pet-safe |
| Küster's Ceratozamia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–5 weeks in winter | Toxic to pets |
| Labrador violet | Medium indirect light (a couple of metres from a window) | Every 5–7 days; keep consistently moist | Pet-safe |
| Laburnum × watereri 'Vossii' | Direct sun (at least 4-6 hours) | Water weekly through the first two seasons, then only in prolonged drought | Toxic to pets |
| Lacandon Zamia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 2–3 weeks in winter | Toxic to pets |
| Lace Aloe | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Lace Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; dry rest in winter | Mildly toxic to pets |
| Lace-bark Pine | Direct sun (at least 4-6 hours) | Water young trees weekly in dry spells; established trees rarely | Mildly toxic to pets |
| Lacecap Hydrangea | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of soil is dry, often several times a week in heat | Toxic to pets |
| Laced Up Elderberry | Direct sun (at least 4-6 hours) | Weekly for the first 1–2 seasons; every 10–14 days once established | Mildly toxic to pets |
| Lady Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil starts to dry, roughly every 3-5 days indoors | Pet-safe |
| Lady Finger Banana | Direct sun (at least 4-6 hours) | Keep consistently moist; water when the top 2-3 cm of soil dries, roughly every 2-4 days in warm growth | Pet-safe |
| Lady Finger Cactus | Direct sun (at least 4-6 hours) | Roughly every 2-3 weeks in summer; far less in winter | Pet-safe |
| Lady of the Night | Bright indirect light (just back from a sunny window) | Every 5–7 days; adjust based on season and soil moisture | Toxic to pets |
| Lady of the Night | Bright indirect light (just back from a sunny window) | When fully dry, roughly every 7-10 days | Pet-safe |
| Lady Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| Ladybird Scarlet cosmos | Direct sun (at least 4-6 hours) | Weekly; allow soil surface to dry between waterings | Pet-safe |
| Laelia anceps | Bright indirect light (just back from a sunny window) | Every 5-7 days when growing; reduce sharply through winter rest | Pet-safe |
| Laelia purpurata | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; less in the cooler rest, every 10-14 days | Pet-safe |
| Laelia rubescens | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; very sparingly in the long dry rest | Pet-safe |
| Laguna Beach Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days from autumn through spring; withhold almost entirely in summer | Pet-safe |
| Lakeside Black Satin Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, roughly every 5-7 days during active growth | Toxic to pets |
| Lamance Iris | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; tolerates seasonal flooding of 5–10 cm (2–4 in) for short periods. | Toxic to pets |
| Lamb's Ear | Direct sun (at least 4-6 hours) | Low; water only when soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Lamellate Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; every 3–4 days in cooler months | Pet-safe |
| Lance Brassia | Bright indirect light (just back from a sunny window) | Once or twice per week in active growth; reduce to every 10–14 days in cooler months | Pet-safe |
| Lance-leaf Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days in winter and spring (active season); withhold almost entirely in summer | Pet-safe |
| Lance-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Lance-leaf Stelis | Medium indirect light (a couple of metres from a window) | Every 2–3 days; never allow the medium to dry completely | Pet-safe |
| Lance-Leaved Trillium | Medium indirect light (a couple of metres from a window) | Moist in spring; more drought-tolerant than most Trilliums once dormant | Mildly toxic to pets |
| Lance-leaved Water Plantain | Direct sun (at least 4-6 hours) | Permanently waterlogged to submerged; 5–30 cm (2–12 in) water depth | Mildly toxic to pets |
| Lanceleaf Coreopsis | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly to establish, then rarely | Pet-safe |
| Langsat | Bright indirect light (just back from a sunny window) | 2–3 times per week; more frequently in dry season | Pet-safe |
| Lansberg's Restrepia | Bright indirect light (just back from a sunny window) | Every 2-4 days; evenly moist but not waterlogged | Pet-safe |
| Lantana | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry; roughly weekly in summer, less in cooler weather | Toxic to pets |
| Larch-leaved Sandwort | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; minimal in winter | Pet-safe |
| Larch-Leaved Stitchwort | Direct sun (at least 4-6 hours) | Very low — drought-tolerant; water sparingly | Mildly toxic to pets |
| large blue fescue | Direct sun (at least 4-6 hours) | Low to moderate; water every 7–10 days during active growth, monthly once established | Pet-safe |
| Large-flowered Bacopa | Direct sun (at least 4-6 hours) | Keep soil evenly and consistently moist | Mildly toxic to pets |
| Large-Flowered Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; moderate during first growing season | Mildly toxic to pets |
| Large-flowered Bellwort | Medium indirect light (a couple of metres from a window) | Moderate; water regularly during spring and early summer growth. Established plants tolerate summer drought. | Pet-safe |
| Large-Flowered Houseleek | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in prolonged dry periods | Pet-safe |
| Large-Flowered Stanhopea | Bright indirect light (just back from a sunny window) | Frequently during growing season; reduce by half in winter | Pet-safe |
| Large-flowered Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn–spring); monthly or less in summer | Toxic to pets |
| Large-Leaf Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Large-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; much less in winter | Pet-safe |
| Large-Leaved Butterwort | Bright indirect light (just back from a sunny window) | Keep substrate damp in summer; reduce sharply in winter | Mildly toxic to pets |
| Large-Leaved Drymonia | Medium indirect light (a couple of metres from a window) | Every 5–8 days; allow top 2 cm to dry slightly between waterings | Pet-safe |
| Large-leaved Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days; adjust based on temperature and pot size | Pet-safe |
| Large-Spike Peperomia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks (allow top half to two-thirds of soil to dry) | Pet-safe |
| large-stalked sinningia | Bright indirect light (just back from a sunny window) | Every 7–14 days in active growth; withhold through dormancy | Pet-safe |
| Large-Vein Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days during the growing season; every 3–4 weeks in winter | Pet-safe |
| Larkspur | Direct sun (at least 4-6 hours) | Every 5–7 days | Toxic to pets |
| Larryleachia marlothii | Bright indirect light (just back from a sunny window) | Sparingly; only when fully dry, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| Laurel Clockvine | Direct sun (at least 4-6 hours) | Every 2–4 days during active growth; reduce in cooler months | Mildly toxic to pets |
| Laurel-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; weekly in the first season | Mildly toxic to pets |
| Lauren's Grape peony poppy | Direct sun (at least 4-6 hours) | Weekly during establishment; every 10–14 days once plants are growing strongly | Toxic to pets |
| Laurustinus Viburnum | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry; weekly while establishing, then occasional | Pet-safe |
| Lauterbach's Fan Palm | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in cooler months | Pet-safe |
| Lavender | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 10-14 days | Toxic to pets |
| Lavender trumpet vine | Bright indirect light (just back from a sunny window) | Weekly during the growing and flowering season; every 2–3 weeks in summer and winter. | Mildly toxic to pets |
| Lawi Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in autumn and winter | Pet-safe |
| Lawson Cypress | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks once established | Mildly toxic to pets |
| Laza Cyphostemma | Direct sun (at least 4-6 hours) | Every 3–5 days in peak summer growing season; almost none in winter | Mildly toxic to pets |
| Lead Plant | Direct sun (at least 4-6 hours) | Deeply once every 2–3 weeks during the first growing season; essentially no supplemental irrigation once established | Pet-safe |
| Least Primrose | Direct sun (at least 4-6 hours) | Every 7–10 days during active growth; very sparingly in summer and winter | Mildly toxic to pets |
| Leatherleaf | Bright indirect light (just back from a sunny window) | Consistently wet to moist — never allow to dry out | Toxic to pets |
| Leatherleaf Sedge | Direct sun (at least 4-6 hours) | Water weekly while establishing in year one, then only during prolonged dry spells | Mildly toxic to pets |
| leatherleaf viburnum | Bright indirect light (just back from a sunny window) | Weekly when establishing; every 2–4 weeks once mature | Mildly toxic to pets |
| Lebanese Rosularia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in winter | Pet-safe |
| Lehmann's Iceplant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during spring and summer; monthly or less in winter | Pet-safe |
| Lemboglossum rossii | Bright indirect light (just back from a sunny window) | Water when the bark approaches dryness, roughly every 4-7 days, keeping pseudobulbs plump | Pet-safe |
| Lemmon's marigold | Direct sun (at least 4-6 hours) | Every 7–10 days in summer heat; monthly during cool winter dormancy | Mildly toxic to pets |
| Lemon Button Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 5-7 days | Pet-safe |
| Lemon Drop Mangosteen | Direct sun (at least 4-6 hours) | Water regularly; requires consistently moist soil and high annual rainfall equivalent. | Mildly toxic to pets |
| Lemon-Scented Ginger | Bright indirect light (just back from a sunny window) | Evenly moist during the growing season; almost dry during winter dormancy. | Mildly toxic to pets |
| Lepismium cruciforme | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Mildly toxic to pets |
| Lesser Begonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth, every 10–14 days in winter | Toxic to pets |
| Lesser Periwinkle | Medium indirect light (a couple of metres from a window) | Weekly during establishment; largely self-sufficient in average rainfall climates | Toxic to pets |
| Lesser Sea Spurrey | Direct sun (at least 4-6 hours) | Low; tolerates periods of drought punctuated by brackish flooding | Mildly toxic to pets |
| Lesser Stitchwort | Bright indirect light (just back from a sunny window) | Moderate; keep soil consistently moist but never waterlogged | Mildly toxic to pets |
| Lesser Theriophonum | Bright indirect light (just back from a sunny window) | Regular watering during active monsoon-season growth; completely dry in dormancy | Toxic to pets |
| Leucanthemum × superbum 'Alaska' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly weekly; more in extended heat | Toxic to pets |
| Leucanthemum × superbum 'Becky' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly weekly; more in prolonged heat | Toxic to pets |
| Leucanthemum × superbum 'Silver Princess' | Direct sun (at least 4-6 hours) | About once a week, when the top 3-4 cm of soil is dry | Toxic to pets |
| Leucanthemum × superbum 'Wirral Supreme' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about weekly; more during drought | Toxic to pets |
| Leyland Cypress | Direct sun (at least 4-6 hours) | Weekly during the first two years, then only in prolonged drought | Mildly toxic to pets |
| Liatris spicata | Direct sun (at least 4-6 hours) | When the top 3-4 cm is dry; roughly weekly while establishing | Pet-safe |
| Liatris spicata 'Kobold' | Direct sun (at least 4-6 hours) | When the top 3-4 cm is dry; about weekly while establishing | Pet-safe |
| Lichang Chirita | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Light Prince Goldfish Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and summer; every 10–14 days in autumn and winter | Pet-safe |
| Lightning jewel orchid | Bright indirect light (just back from a sunny window) | Keep lightly and evenly moist — never bone dry, never soggy | Mildly toxic to pets |
| Lilac 'Charles Joly' | Direct sun (at least 4-6 hours) | Weekly through the first season, then only in drought | Mildly toxic to pets |
| Lilac Sage | Bright indirect light (just back from a sunny window) | Water when the top 5 cm of soil is dry | Pet-safe |
| Liliana's Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Lilium 'Black Beauty' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, roughly weekly in the growing season | Toxic to pets |
| Lilium 'Regale' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, roughly weekly during active growth | Toxic to pets |
| Lily of the valley | Low light (north window or shaded room) | Weekly watering | Toxic to pets |
| Lilyturf-like Primulina | Medium indirect light (a couple of metres from a window) | Every 10–14 days in active growth; every 3–4 weeks in winter | Mildly toxic to pets |
| Linaria maroccana 'Fairy Bouquet' | Direct sun (at least 4-6 hours) | When the top 2 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Linden-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow soil to partially dry) | Pet-safe |
| Lindheimer's Muhly | Direct sun (at least 4-6 hours) | Water to establish the first season, then occasionally in drought, roughly every 2-3 weeks | Mildly toxic to pets |
| Lion's Angraecum | Bright indirect light (just back from a sunny window) | Every 2–4 days in summer, every 7–10 days in winter | Pet-safe |
| Lipstick Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 7-10 days in growth | Pet-safe |
| Liquidambar styraciflua | Direct sun (at least 4-6 hours) | Weekly while establishing; keep soil consistently moist | Mildly toxic to pets |
| Liquidambar styraciflua 'Worplesdon' | Direct sun (at least 4-6 hours) | Weekly while establishing; keep soil consistently moist | Mildly toxic to pets |
| Liriodendron tulipifera | Direct sun (at least 4-6 hours) | Deep soak weekly in the first two or three growing seasons, then rely on rainfall | Pet-safe |
| Lithops Divergens | Direct sun (at least 4-6 hours) | Only in autumn and spring growth, sparingly when soil is bone dry; no water during summer or mid-winter rest | Pet-safe |
| Lithops Julii | Bright indirect light (just back from a sunny window) | During spring and autumn growth only, roughly every 2-3 weeks; none in summer or winter | Pet-safe |
| Lithops Optica 'Rubra' | Bright indirect light (just back from a sunny window) | Sparingly in spring and autumn, every 2-3 weeks; withhold entirely in summer and winter | Pet-safe |
| Lithops Pseudotruncatella | Direct sun (at least 4-6 hours) | Very infrequently, following the seasonal cycle rather than a fixed schedule | Pet-safe |
| Lithops Salicola | Bright indirect light (just back from a sunny window) | Only during active growth (autumn and spring), roughly every 2-3 weeks; none in summer or deep winter | Pet-safe |
| Little Bluestem | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; minimal once established | Pet-safe |
| Little Bunny Fountain Grass | Direct sun (at least 4-6 hours) | Weekly while establishing in the first season, then only during prolonged drought | Pet-safe |
| Little Gem Magnolia | Direct sun (at least 4-6 hours) | Weekly while establishing (1–3 years); deep watering in summer drought thereafter | Pet-safe |
| Little Kitten Dwarf Maiden Grass | Direct sun (at least 4-6 hours) | Weekly to establish, then during dry spells; container plants need more frequent water | Mildly toxic to pets |
| Little Leather Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep roots evenly moist | Pet-safe |
| little silver spider grass | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; reduce significantly in winter | Pet-safe |
| Living Stones | Direct sun (at least 4-6 hours) | Very infrequently and strictly by season, often only every few weeks and not at all in summer or deep winter | Pet-safe |
| Livistona Decipiens | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Lobb's Ixora | Bright indirect light (just back from a sunny window) | Every 2-3 days in summer, weekly in cooler months | Mildly toxic to pets |
| Lobbi Japanese Cedar | Direct sun (at least 4-6 hours) | Weekly during establishment; fortnightly in dry spells once mature | Mildly toxic to pets |
| Lobed Tickseed | Bright indirect light (just back from a sunny window) | Low to moderate; drought-tolerant but benefits from occasional watering | Pet-safe |
| Lobelia erinus 'Techno Heat Blue' | Direct sun (at least 4-6 hours) | Keep consistently moist; check baskets daily in hot weather | Toxic to pets |
| Lobelia siphilitica | Direct sun (at least 4-6 hours) | Keep consistently moist; tolerates wet soil and short dry spells | Toxic to pets |
| Lobster Claw Heliconia | Bright indirect light (just back from a sunny window) | Every 5–7 days; maintain consistently moist soil | Mildly toxic to pets |
| Lobster Flower | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; monthly or less in winter | Pet-safe |
| London Pride | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; less in winter | Pet-safe |
| London Pride | Medium indirect light (a couple of metres from a window) | Weekly during dry spells; little additional watering needed in temperate climates | Pet-safe |
| Lonesome Dove Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, about every 5-7 days during active growth | Toxic to pets |
| Long Spider Orchid | Bright indirect light (just back from a sunny window) | Every 3–4 days in active growth; every 2–3 weeks in winter | Pet-safe |
| Long-Flowered Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during the growing season; fortnightly in winter | Toxic to pets |
| Long-flowered Sage | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; rarely in winter | Mildly toxic to pets |
| Long-Haired Zygopetalum | Bright indirect light (just back from a sunny window) | Every 3–4 days in growth, reduce to weekly in winter | Pet-safe |
| Long-leaf Parlor Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; reduce to every 10–14 days in winter | Pet-safe |
| Long-leaf Parlour Palm | Medium indirect light (a couple of metres from a window) | Every 10–14 days in summer, every 2–3 weeks in winter | Pet-safe |
| Long-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season, monthly in winter | Pet-safe |
| Long-Leaved Pachyphytum | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; every 4–6 weeks in autumn and winter | Pet-safe |
| Long-Leaved Phlomis | Direct sun (at least 4-6 hours) | Low — water every 2–3 weeks during the growing season; minimal to none in winter | Mildly toxic to pets |
| Long-leaved speedwell | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in winter | Pet-safe |
| Long-lipped Tongue Orchid | Direct sun (at least 4-6 hours) | Winter-wet, summer-dry cycle; water lightly in autumn through spring, withhold completely in summer | Mildly toxic to pets |
| Long-stamen Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Long-styled Sage | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; very sparingly in winter | Mildly toxic to pets |
| Long-tailed Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in warm months; every 1-2 days in cool months — medium must not dry out between waterings | Pet-safe |
| Longan | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil dries; keep steady in growth | Mildly toxic to pets |
| Longan | Direct sun (at least 4-6 hours) | Every 5–7 days for young trees; every 10–14 days once established | Mildly toxic to pets |
| Longcluster Japanese Wisteria | Direct sun (at least 4-6 hours) | Every 7–14 days during dry periods; established plants need little supplemental watering | Toxic to pets |
| Longleaf Phlox | Direct sun (at least 4-6 hours) | Every 14–21 days when establishing; minimal supplemental water once established | Pet-safe |
| Lonicera caprifolium | Direct sun (at least 4-6 hours) | Keep the root zone evenly moist; water deeply in dry spells, every 5-7 days in summer heat | Mildly toxic to pets |
| Lonicera periclymenum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil dries, roughly every 5-10 days while establishing | Mildly toxic to pets |
| Lonicera periclymenum 'Serotina' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil dries, roughly every 5-10 days while establishing | Mildly toxic to pets |
| Loose Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in winter | Mildly toxic to pets |
| Loose-flowered Monanthes | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in spring and summer; every 4–6 weeks or less in winter | Mildly toxic to pets |
| Loquat | Direct sun (at least 4-6 hours) | Deeply when the top 5 cm of soil dries, roughly weekly in warm growth, less in winter | Mildly toxic to pets |
| Loranthus-leaf Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 2-3 days; keep evenly moist | Pet-safe |
| Lossow's Jensenobotrya | Bright indirect light (just back from a sunny window) | Water sparingly year-round, every 2–3 weeks | Toxic to pets |
| Lotax Dragon Orchid | Medium indirect light (a couple of metres from a window) | Every 2–3 days; never fully dry | Pet-safe |
| Love-in-a-mist | Direct sun (at least 4-6 hours) | Once or twice a week; established plants rarely need supplemental watering in cool, moist climates | Toxic to pets |
| Love-lies-bleeding | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in summer | Mildly toxic to pets |
| Loving Touch Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in summer | Pet-safe |
| Low Shield Plant | Low light (north window or shaded room) | Every 10–14 days; less in winter | Toxic to pets |
| Lucky Nut | Direct sun (at least 4-6 hours) | Every 5–10 days during establishment; drought-tolerant once established | Toxic to pets |
| Lucuma | Direct sun (at least 4-6 hours) | Every 7–14 days; allow top 5–8 cm to dry between waterings | Mildly toxic to pets |
| Lund's Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Lungling Primulina | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; reduce to every 3–4 weeks in winter | Mildly toxic to pets |
| Lungwort | Medium indirect light (a couple of metres from a window) | Twice weekly in dry spells; keep soil consistently moist | Mildly toxic to pets |
| Lungwort Pulmonaria | Low light (north window or shaded room) | Keep soil evenly moist; water every 4-6 days in dry spells, more in containers | Mildly toxic to pets |
| Lupinus 'Chandelier' | Direct sun (at least 4-6 hours) | Every 5-7 days; keep the soil evenly moist, never sodden | Toxic to pets |
| Lupinus 'Manhattan Lights' | Direct sun (at least 4-6 hours) | Every 5-7 days; keep soil consistently moist but well-drained | Toxic to pets |
| Lupinus 'Masterpiece' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply once or twice weekly in dry spells | Toxic to pets |
| Lupinus 'Tequila Flame' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; deep water once or twice weekly when dry | Toxic to pets |
| Lupinus 'The Governor' | Direct sun (at least 4-6 hours) | Every 5-7 days; keep soil consistently moist, never waterlogged | Toxic to pets |
| Lupinus polyphyllus 'Gallery Blue' | Direct sun (at least 4-6 hours) | Every 5-7 days; maintain evenly moist soil without waterlogging | Toxic to pets |
| Luzon Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; reduce slightly in cooler months | Pet-safe |
| Ly's Wax Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Lycaste skinneri | Bright indirect light (just back from a sunny window) | Every 5-7 days in active growth; reduce sharply after leaf drop, roughly every 2-3 weeks in winter rest | Pet-safe |
| Lychee | Direct sun (at least 4-6 hours) | Keep evenly moist in growth; water when the top 3-5 cm dries | Mildly toxic to pets |
| Lycian Sage Phlomis | Direct sun (at least 4-6 hours) | Low — every 2–3 weeks in the growing season; minimal to none in winter | Mildly toxic to pets |
| Lydia's Window Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (September–March in the Northern Hemisphere); essentially none in summer | Mildly toxic to pets |
| Lydian Broom | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only to establish | Toxic to pets |
| Lydian Stonecrop | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Pet-safe |
| Lyme Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Lysimachia nummularia | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water whenever the surface begins to dry | Mildly toxic to pets |
| Macarthur Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days during growing season; reduce in cooler months | Pet-safe |
| MacDonnell Ranges Cycad | Direct sun (at least 4-6 hours) | Every 3–4 weeks (established); monthly or less in winter | Toxic to pets |
| Macho Fern | Medium indirect light (a couple of metres from a window) | Every 2–4 days in summer; every 5–7 days in winter | Pet-safe |
| Madagascar Feather Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in warm conditions; every 10–14 days in cooler periods | Pet-safe |
| Madagascar Palm Geay | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; once or twice per month in winter | Toxic to pets |
| Madagascar Periwinkle (Vinca) | Direct sun (at least 4-6 hours) | When the top 2-3 cm (1 in) of soil is dry, roughly weekly | Toxic to pets |
| Madame Alfred Carriere Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly when establishing; mature plants when the top few centimetres of soil dry, and they tolerate some drought | Pet-safe |
| Madame Butterfly snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; keep evenly moist | Pet-safe |
| Madame Galen Trumpet Vine | Direct sun (at least 4-6 hours) | Weekly when young; drought-tolerant once established | Mildly toxic to pets |
| Magdalene Angraecum | Bright indirect light (just back from a sunny window) | Regular watering spring–autumn; reduce markedly in winter | Pet-safe |
| Magenta Cherry | Direct sun (at least 4-6 hours) | Every 5–7 days in the growing season; reduce to every 10–14 days in winter | Mildly toxic to pets |
| magic star stromanthe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Magnificent Columnea | Bright indirect light (just back from a sunny window) | Every 4–7 days during active growth; every 10–14 days in winter | Pet-safe |
| Magnificent Homalomena | Medium indirect light (a couple of metres from a window) | Every 10–14 days in growing season; every 14–21 days in winter | Toxic to pets |
| Magnificent Juno Iris | Direct sun (at least 4-6 hours) | Moderate in growth; dry in summer dormancy | Toxic to pets |
| Magnolia 'Elizabeth' | Direct sun (at least 4-6 hours) | Weekly during the first few years and in summer droughts | Pet-safe |
| Magnolia 'Jane' | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the first two years, then during dry spells | Pet-safe |
| Magnolia 'Susan' | Direct sun (at least 4-6 hours) | Keep moist while establishing; water deeply weekly in dry spells for the first few years | Pet-safe |
| Magnolia grandiflora 'Gallissonnière' | Direct sun (at least 4-6 hours) | Weekly deep watering in the first 2-3 years, then only during prolonged dry spells | Pet-safe |
| Magnolia wilsonii | Bright indirect light (just back from a sunny window) | Weekly while establishing and during dry summer spells | Pet-safe |
| Magnolia-leaved Sage | Bright indirect light (just back from a sunny window) | Weekly in summer; every 2–3 weeks in winter | Mildly toxic to pets |
| Mahonia aquifolium Apollo | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly through the first year then occasionally | Pet-safe |
| Mahonia Charity | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly to establish then chiefly during droughts | Pet-safe |
| Mahonia Pinnacle | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly through the first year then occasionally | Pet-safe |
| Mahonia repens | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly to establish then rarely | Pet-safe |
| Mahonia Soft Caress | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, about weekly and more attentively than spinier mahonias | Pet-safe |
| Mahonia Winter Sun | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly while establishing then only in dry spells | Pet-safe |
| Maiden Grass | Direct sun (at least 4-6 hours) | Weekly during the first growing season; every 2–3 weeks once established | Pet-safe |
| Maidenhair fern | Medium indirect light (a couple of metres from a window) | Keep evenly moist — often every 2-3 days | Pet-safe |
| Maidenhair Tree | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil dries, roughly every 1-3 days in summer | Mildly toxic to pets |
| Maire's fescue | Direct sun (at least 4-6 hours) | Low; water every 2–3 weeks during dry spells; once established, relies on natural rainfall in most temperate climates | Pet-safe |
| Majeste Pulmonaria | Low light (north window or shaded room) | Keep soil evenly moist; water every 4-6 days in dry weather, more for containers | Mildly toxic to pets |
| Malabar Quisqualis | Direct sun (at least 4-6 hours) | Every 3–5 days during dry periods; reduce in cool or wet seasons | Mildly toxic to pets |
| Malabar Tamarind | Bright indirect light (just back from a sunny window) | Water consistently to keep soil evenly moist; reduce slightly in cooler months. | Mildly toxic to pets |
| Malay Apple | Direct sun (at least 4-6 hours) | Deep watering every 4-7 days; keep consistently moist when fruiting | Mildly toxic to pets |
| Male Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Mildly toxic to pets |
| Maleberry | Bright indirect light (just back from a sunny window) | Regular to frequent; prefers moist to wet conditions | Toxic to pets |
| Malepartus silver grass | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in autumn; minimal in winter | Pet-safe |
| Mallow-leaved Pyrenacantha | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (summer–autumn); very sparingly in winter | Mildly toxic to pets |
| Maltese cross | Direct sun (at least 4-6 hours) | Every 5–7 days in the growing season; less in cool or wet periods | Pet-safe |
| Malus 'Profusion' | Direct sun (at least 4-6 hours) | Water regularly while establishing; mature trees need water only in prolonged drought | Toxic to pets |
| Malus 'Royalty' | Direct sun (at least 4-6 hours) | Water regularly for the first 2-3 years; established trees need water only in extended drought | Toxic to pets |
| Malus floribunda | Direct sun (at least 4-6 hours) | Water regularly during establishment; mature trees need water only in extended drought | Toxic to pets |
| Malus tschonoskii | Direct sun (at least 4-6 hours) | Water regularly for the first 2-3 years; established trees need water only in prolonged drought | Toxic to pets |
| Mamey Apple | Direct sun (at least 4-6 hours) | 2–3 times per week; reduce in winter | Mildly toxic to pets |
| Mammillaria mystax | Direct sun (at least 4-6 hours) | Water deeply when the mix is completely dry, about every 1-2 weeks in summer; keep dry in winter | Pet-safe |
| Mammy Croton | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Mamoncillo | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-12 days once established | Mildly toxic to pets |
| Mandacaru Cactus | Direct sun (at least 4-6 hours) | Every 2-3 weeks in the growing season (spring–summer); every 4-6 weeks in autumn; once every 6-8 weeks in winter | Mildly toxic to pets |
| Mandevilla 'Alice du Pont' | Direct sun (at least 4-6 hours) | Keep evenly moist in summer; water when the top 2-3 cm of soil dries, often every 2-4 days in heat | Mildly toxic to pets |
| Mangosteen | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water deeply and often, never letting it dry out | Mildly toxic to pets |
| Manhattan Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Manna Ash | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Many Fingers | Direct sun (at least 4-6 hours) | Every 2 weeks in spring and summer; every 4–6 weeks in autumn and winter | Pet-safe |
| Many-Flowered Air Plant | Bright indirect light (just back from a sunny window) | Mist 1–2 times per week, or a 20-minute soak every 1–2 weeks | Pet-safe |
| many-flowered cape primrose | Medium indirect light (a couple of metres from a window) | Every 10–14 days; allow soil to dry between waterings | Pet-safe |
| Many-flowered Fockea | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; monthly or less in winter | Mildly toxic to pets |
| Many-flowered Heath | Direct sun (at least 4-6 hours) | Moderate to infrequent; drought-tolerant once established | Mildly toxic to pets |
| Many-Flowered Ruschia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (autumn–spring); very sparingly in summer | Mildly toxic to pets |
| Many-haired Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; almost dry in winter | Pet-safe |
| Many-pinnate Cycad | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–5 weeks in winter | Toxic to pets |
| Many-stemmed Liveforever | Direct sun (at least 4-6 hours) | Every 2–3 weeks autumn through late spring; none in summer | Pet-safe |
| Mapu Fan Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Marang | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil begins to dry, often every 3-6 days in warm growth | Mildly toxic to pets |
| Marble Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup weekly; water soil every 2–3 weeks | Pet-safe |
| Marble Houseleek | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; once a month or less in winter | Pet-safe |
| Marbled Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water only in autumn during new-leaf emergence (September–November); completely dry rest of year | Pet-safe |
| Marcgrave's Nidularium | Medium indirect light (a couple of metres from a window) | Weekly cup refill; medium kept lightly moist | Pet-safe |
| Marginal Wood Fern | Low light (north window or shaded room) | Keep evenly moist while establishing; water deeply during droughts, about every 7-10 days in dry summers | Pet-safe |
| Marigold | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 5-7 days | Mildly toxic to pets |
| Marmalade Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Marram Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant | Pet-safe |
| Marseille Germander | Direct sun (at least 4-6 hours) | Infrequently once established; weekly when newly planted | Mildly toxic to pets |
| Marsh Fern | Bright indirect light (just back from a sunny window) | Keep wet to saturated at all times; never allow the soil to dry out | Mildly toxic to pets |
| Martagon Lily | Medium indirect light (a couple of metres from a window) | When top 3–4 cm of soil feels dry | Toxic to pets |
| Martinezii Lily | Direct sun (at least 4-6 hours) | Dry in summer; moderate in winter-to-spring growth period | Toxic to pets |
| Martius Fan Palm | Direct sun (at least 4-6 hours) | Weekly during establishment; once established, every 2–3 weeks depending on rainfall | Pet-safe |
| Martius's Brassavola | Bright indirect light (just back from a sunny window) | Every 5–7 days during growing season; reduce in winter after flowering | Pet-safe |
| Masdevallia Angel Frost | Medium indirect light (a couple of metres from a window) | Keep evenly moist year-round, watering about every 2-4 days so the medium never dries out | Pet-safe |
| Masdevallia coccinea | Medium indirect light (a couple of metres from a window) | Keep evenly moist all year, watering about every 2-4 days so the medium never dries fully | Pet-safe |
| Masdevallia tovarensis | Medium indirect light (a couple of metres from a window) | Keep evenly moist throughout the year, watering roughly every 2-4 days so the medium stays damp | Pet-safe |
| Masdevallia veitchiana | Medium indirect light (a couple of metres from a window) | Keep roots evenly moist year-round; water roughly every 2-4 days so the mix never fully dries | Pet-safe |
| Masters' Larch | Direct sun (at least 4-6 hours) | Weekly during first 2 years; monthly once established | Pet-safe |
| Matasano | Direct sun (at least 4-6 hours) | Every 2–3 weeks when young; highly drought-tolerant once established | Toxic to pets |
| Matted Globularia | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter — avoid wetting the crown. | Mildly toxic to pets |
| Matted Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks; very sparingly in winter | Pet-safe |
| Matthiola incana 'Katz Sakura' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water every 3-5 days, more in heat | Pet-safe |
| Maudiae Slipper Orchid | Low light (north window or shaded room) | Every 5–7 days | Pet-safe |
| Maughan's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–4 weeks in autumn growth phase; none during summer dormancy | Pet-safe |
| Mauna Loa Peace Lily | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14 days in winter | Toxic to pets |
| Mauritius Lychee | Direct sun (at least 4-6 hours) | Keep evenly moist in growth; water when the top 3-5 cm dries | Mildly toxic to pets |
| Maury's Air Plant | Direct sun (at least 4-6 hours) | Mist or soak every 10–14 days | Pet-safe |
| Maximilian Sunflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal supplemental irrigation needed | Pet-safe |
| May Night Salvia | Direct sun (at least 4-6 hours) | When top 3-5 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| Mayapple | Low light (north window or shaded room) | 1–2 times per week during spring; reduce as plant enters summer dormancy | Toxic to pets |
| Meadow Blazing Star | Direct sun (at least 4-6 hours) | Keep evenly moist to medium; water during dry spells | Pet-safe |
| Meadow Clary | Direct sun (at least 4-6 hours) | Low to moderate; water when the top 5 cm is dry | Mildly toxic to pets |
| meadow fountain grass | Direct sun (at least 4-6 hours) | Weekly when new; every 2–3 weeks once established | Pet-safe |
| Meadow Oat Grass | Direct sun (at least 4-6 hours) | Low; very drought-tolerant | Pet-safe |
| Mealy-cup Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days when young; every 10-14 days once established | Pet-safe |
| Mealycup Sage 'Victoria Blue' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; roughly weekly, less once established | Pet-safe |
| Mediterranean Everlasting | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established | Mildly toxic to pets |
| Mediterranean feather grass | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; minimal in winter | Pet-safe |
| Medusa Orchid | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water every 2-4 days, more in heat | Pet-safe |
| Melocactus peruvianus | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 1-2 weeks in warm summer growth; minimal in winter | Mildly toxic to pets |
| Membrane-flowered Stelis | Medium indirect light (a couple of metres from a window) | Every 1–2 days; never allow roots to fully dry | Pet-safe |
| Merola's Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; monthly or less in winter | Toxic to pets |
| Metallic Heliconia | Medium indirect light (a couple of metres from a window) | 2–3 times per week in warm conditions; once weekly in cooler periods | Mildly toxic to pets |
| Mexican Achimenes | Bright indirect light (just back from a sunny window) | Consistently moist throughout the growing season (spring–autumn); dry in winter dormancy | Pet-safe |
| Mexican Aechmea | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); refresh central tank monthly | Pet-safe |
| Mexican Blue Palm | Direct sun (at least 4-6 hours) | Occasional deep soakings; highly drought-tolerant once established | Mildly toxic to pets |
| Mexican Bush Sage | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 2–3 weeks in autumn | Mildly toxic to pets |
| Mexican Butterwort | Bright indirect light (just back from a sunny window) | Tray-water in summer; near-dry in winter | Mildly toxic to pets |
| Mexican Cypress | Direct sun (at least 4-6 hours) | Weekly during establishment; fortnightly in dry periods once mature | Mildly toxic to pets |
| Mexican Fan Palm | Direct sun (at least 4-6 hours) | Deeply but infrequently once established, every 10-14 days; weekly while young | Mildly toxic to pets |
| Mexican Feather Grass | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought | Mildly toxic to pets |
| Mexican Fleabane | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; minimal once established | Pet-safe |
| Mexican Giant Cardon | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer; minimal in winter | Mildly toxic to pets |
| Mexican Hat | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very drought-tolerant | Pet-safe |
| Mexican Sage | Direct sun (at least 4-6 hours) | Weekly during active growth | Pet-safe |
| Mexican Snowball | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly in winter | Pet-safe |
| Mexican sunflower | Direct sun (at least 4-6 hours) | Weekly until established; then every 10–14 days; drought-tolerant once mature | Mildly toxic to pets |
| Mexican Tortoise Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days during the summer growing season; reduce to once a month or less in winter dormancy | Mildly toxic to pets |
| Mexican zinnia | Direct sun (at least 4-6 hours) | Once or twice weekly; allow the top 2–3 cm of soil to dry between waterings | Pet-safe |
| Meyer's Cape Primrose | Bright indirect light (just back from a sunny window) | Every 10-14 days in growth; every 4-6 weeks in winter | Pet-safe |
| Meyer's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer (August/September) through autumn; withheld completely from May to August | Pet-safe |
| Micholitz's Cycad | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; once a month or less in winter | Toxic to pets |
| Mignonette | Direct sun (at least 4-6 hours) | Every 5–7 days; do not allow to dry out completely | Pet-safe |
| Mignonette Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Mikania ternata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days in growth | Mildly toxic to pets |
| Milkflower cotoneaster | Direct sun (at least 4-6 hours) | Weekly during the first growing season; drought-tolerant once established | Mildly toxic to pets |
| Milky bellflower | Direct sun (at least 4-6 hours) | Weekly during dry periods; moderate water requirements | Pet-safe |
| Milky Way Kousa Dogwood | Bright indirect light (just back from a sunny window) | Weekly while establishing; deep watering in summer drought | Pet-safe |
| Million bells | Direct sun (at least 4-6 hours) | Daily in hot weather for containers; every 2–3 days in cooler periods | Mildly toxic to pets |
| Miltonia Orchid | Bright indirect light (just back from a sunny window) | Every 2-5 days in active growth; let medium approach dryness, never bone-dry | Pet-safe |
| Miltoniopsis roezlii | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water every 3-5 days, never letting the mix fully dry | Pet-safe |
| Mimulus ringens | Direct sun (at least 4-6 hours) | Keep wet at all times; never allow the soil to dry | Mildly toxic to pets |
| Min Fir | Direct sun (at least 4-6 hours) | Regularly during establishment; moderate thereafter | Pet-safe |
| Miniature Cone Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days during active growth (autumn–spring); completely dry through summer dormancy | Pet-safe |
| Miniature Desert Rose | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Pet-safe |
| Mintleaf Spurflower | Bright indirect light (just back from a sunny window) | Every 7-10 days, allowing the top 2-3 cm of soil to dry between waterings | Mildly toxic to pets |
| Minute Masdevallia | Medium indirect light (a couple of metres from a window) | Every 2–3 days; keep medium consistently moist | Pet-safe |
| Minuteman Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, about every 5-7 days in the growing season | Toxic to pets |
| Miquel's Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks | Toxic to pets |
| Miquel's Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Miracle Fruit | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 1-2 cm of soil begins to dry, often every 2-4 days | Mildly toxic to pets |
| Miranda's Ceratozamia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks | Toxic to pets |
| Miss Grace Dawn Redwood | Direct sun (at least 4-6 hours) | Weekly or more in dry periods; tolerates wet soils | Pet-safe |
| Miss Jekyll love-in-a-mist | Direct sun (at least 4-6 hours) | Weekly or as needed | Mildly toxic to pets |
| Miss Kim Lilac | Direct sun (at least 4-6 hours) | Weekly to establish, then occasional deep watering in drought | Mildly toxic to pets |
| Miss Willmott's Ghost | Direct sun (at least 4-6 hours) | Low — once established, water only during prolonged drought | Pet-safe |
| Miss Wilmott's Ghost | Direct sun (at least 4-6 hours) | Water occasionally in the first year, then rarely once established | Mildly toxic to pets |
| Missouri Coneflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very drought-tolerant | Mildly toxic to pets |
| Mister Lincoln Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Mock Orange | Direct sun (at least 4-6 hours) | Water in dry spells; drought-tolerant once established | Mildly toxic to pets |
| Mock Orange 'Belle Etoile' | Direct sun (at least 4-6 hours) | Weekly while establishing; during dry spells thereafter | Mildly toxic to pets |
| Moctezuma Butterwort | Bright indirect light (just back from a sunny window) | Tray-water in summer; near-dry in winter | Mildly toxic to pets |
| Modoc Cypress | Direct sun (at least 4-6 hours) | Minimal once established; drought-tolerant | Pet-safe |
| Monarch Birch | Direct sun (at least 4-6 hours) | Regular watering for first 2–3 years; moderate once established | Pet-safe |
| Monarch of the Veldt | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Mildly toxic to pets |
| Monarda 'Jacob Cline' | Direct sun (at least 4-6 hours) | Water deeply about once or twice a week, keeping soil consistently moist | Mildly toxic to pets |
| Mondo Grass | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Mongolian Linden | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks in dry summers | Pet-safe |
| Monk's Hood Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in the growing season; keep dry in winter | Pet-safe |
| Monkey Comb Vine | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; reduce in cooler or drier months | Mildly toxic to pets |
| Monkey flower | Medium indirect light (a couple of metres from a window) | Every 2–3 days; more frequently in warm or windy weather | Pet-safe |
| Monkey Jack | Direct sun (at least 4-6 hours) | Water young trees 2–3 times per week; established trees are moderately drought-tolerant and generally managed on natural rainfall in tropical climates. | Pet-safe |
| Monstera | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera standleyana | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Subpinnata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Monstrose Apple Cactus | Direct sun (at least 4-6 hours) | When the mix is dry, roughly every 10-14 days in summer; minimal in winter | Pet-safe |
| Mont Cenis Bellflower | Direct sun (at least 4-6 hours) | Very low — water sparingly during growth; keep dry in winter | Mildly toxic to pets |
| Monterey Cypress | Direct sun (at least 4-6 hours) | Weekly during establishment; infrequent once mature | Mildly toxic to pets |
| Montgomery Astilbe | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet; water when the top 2-3 cm dries, roughly every 3-5 days in summer | Mildly toxic to pets |
| Montpellier Rock Rose | Direct sun (at least 4-6 hours) | Low — establishment watering only | Mildly toxic to pets |
| Moon Cactus | Bright indirect light (just back from a sunny window) | Only when the mix is fully dry, roughly every 10-14 days in summer and far less in winter | Pet-safe |
| Moonglow Juniper | Direct sun (at least 4-6 hours) | Every 7-10 days when establishing, then deep occasional soaks | Mildly toxic to pets |
| Moonshadow Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Moonstones | Bright indirect light (just back from a sunny window) | Every 2 to 3 weeks in active growth; roughly monthly or less in winter | Pet-safe |
| Moor Witch Purple Moor Grass | Bright indirect light (just back from a sunny window) | Moderate to frequent — prefers reliably moist soil; dislikes drought | Pet-safe |
| Moore's Blechnum | Medium indirect light (a couple of metres from a window) | Every 5–7 days in summer, every 10–14 days in winter | Pet-safe |
| Moore's Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Moore's Cycad | Bright indirect light (just back from a sunny window) | Water every 2–4 weeks during active growth, sparingly in winter | Toxic to pets |
| Moore's Macrozamia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks | Toxic to pets |
| Mops Dwarf Mountain Pine | Direct sun (at least 4-6 hours) | Every 10–14 days in summer once established; minimal in winter | Toxic to pets |
| Morell's Billbergia | Bright indirect light (just back from a sunny window) | Keep central cup filled; water substrate every 1-2 weeks | Pet-safe |
| Morning Light Maiden Grass | Direct sun (at least 4-6 hours) | Weekly while establishing in the first year, then only during prolonged drought | Mildly toxic to pets |
| Morning Light Maiden Grass | Direct sun (at least 4-6 hours) | Weekly for the first growing season; every 2–3 weeks once established | Pet-safe |
| Moroccan Sea Holly | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established, water sparingly in winter | Pet-safe |
| Moroccan toadflax | Direct sun (at least 4-6 hours) | Once or twice a week; reduce to weekly once established | Mildly toxic to pets |
| Mosaic Bromeliad | Medium indirect light (a couple of metres from a window) | Top up the central urn weekly; water the potting mix every 2–3 weeks | Pet-safe |
| Mosaic Vase Plant | Medium indirect light (a couple of metres from a window) | Keep urn filled; water medium every 10–14 days | Pet-safe |
| Moses in the Cradle | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Moso Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in the growing season; weekly in winter | Pet-safe |
| Mosquito Plant | Direct sun (at least 4-6 hours) | Every 7–14 days once established; more frequent when young | Pet-safe |
| Moss Phlox | Direct sun (at least 4-6 hours) | Moderate — water during establishment and dry spells | Pet-safe |
| Moss rose | Direct sun (at least 4-6 hours) | When the soil is thoroughly dry, roughly every 7-10 days in summer | Toxic to pets |
| Moss-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Moth Mullein | Direct sun (at least 4-6 hours) | Every 10–14 days during dry spells; largely self-sufficient once established | Mildly toxic to pets |
| Mother of Pearl poppy | Direct sun (at least 4-6 hours) | Once or twice weekly during establishment; minimal once established | Mildly toxic to pets |
| Mother of thousands | Bright indirect light (just back from a sunny window) | When the top 5 cm (2 in) of soil is dry, roughly every 1-2 weeks in growth | Toxic to pets |
| Mottled Wild Ginger | Low light (north window or shaded room) | Every 7–10 days during the growing season; every 14 days once well established | Mildly toxic to pets |
| Moudry Black Fountain Grass | Direct sun (at least 4-6 hours) | Weekly during establishment, then occasional deep watering in dry spells | Pet-safe |
| Mount Etna Broom | Direct sun (at least 4-6 hours) | Low — very drought-tolerant once established | Toxic to pets |
| Mountain African Daisy | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season | Mildly toxic to pets |
| Mountain Aloe | Direct sun (at least 4-6 hours) | When soil is fully dry, every 1-3 weeks in warm growth | Toxic to pets |
| Mountain Alyssum | Direct sun (at least 4-6 hours) | Every 14–21 days during growth; minimal in winter | Pet-safe |
| Mountain Bluebells | Bright indirect light (just back from a sunny window) | Water deeply 2–3 times per week; does not tolerate drying out | Pet-safe |
| Mountain Cornflower | Direct sun (at least 4-6 hours) | Weekly in the first season; established plants are drought-tolerant and rarely need watering | Pet-safe |
| Mountain Desert Sage | Direct sun (at least 4-6 hours) | Very low once established; xeric to moderate | Pet-safe |
| Mountain Everlasting | Direct sun (at least 4-6 hours) | Every 2–3 weeks during growing season; minimal in winter | Pet-safe |
| Mountain Fern | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water when the top 2-3 cm dry out, roughly weekly in dry weather | Mildly toxic to pets |
| Mountain Fetterbush | Bright indirect light (just back from a sunny window) | Water every 7–14 days; once established it is relatively drought-tolerant for a Pieris | Toxic to pets |
| Mountain Germander | Direct sun (at least 4-6 hours) | Rarely once established; water during dry spells in the first season | Mildly toxic to pets |
| Mountain Hemlock | Direct sun (at least 4-6 hours) | Weekly during establishment; relies on rainfall and snowmelt once established | Pet-safe |
| Mountain Hydrangea 'Bluebird' | Bright indirect light (just back from a sunny window) | About weekly, roughly 2.5 cm (1 inch) per week; water when the top 3-5 cm of soil is dry | Toxic to pets |
| mountain laurel | Bright indirect light (just back from a sunny window) | Weekly during establishment; water during dry spells once established | Toxic to pets |
| Mountain Male Fern | Medium indirect light (a couple of metres from a window) | Every 7–14 days during the growing season; once monthly or less in winter | Mildly toxic to pets |
| Mountain Phlox | Medium indirect light (a couple of metres from a window) | Weekly; allow the top 2–3 cm of soil to dry between waterings | Pet-safe |
| Mountain Pieris | Bright indirect light (just back from a sunny window) | Keep evenly moist; water weekly in dry weather and never allow drought stress | Toxic to pets |
| Mountain Pine | Direct sun (at least 4-6 hours) | When the soil surface starts to dry, then soak thoroughly | Mildly toxic to pets |
| Mountain Sandwort | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Pet-safe |
| Mountain Soursop | Direct sun (at least 4-6 hours) | Twice weekly when establishing; weekly once mature | Mildly toxic to pets |
| Mountain Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season, every 14–21 days in winter | Pet-safe |
| Mourning Holly Fern | Low light (north window or shaded room) | Every 5–7 days in the growing season, every 10–14 days in winter | Pet-safe |
| Mouse Head Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks year-round, with a brief reduction after flowering | Mildly toxic to pets |
| Mouse-ear Hawkweed | Direct sun (at least 4-6 hours) | Infrequent — allow soil to dry between waterings | Mildly toxic to pets |
| Mouse-Tail Air Plant | Bright indirect light (just back from a sunny window) | Mist or soak every 10–14 days | Pet-safe |
| Mpumalanga Cycad | Direct sun (at least 4-6 hours) | Every 3–5 weeks | Toxic to pets |
| Mr Bowling Ball Arborvitae | Direct sun (at least 4-6 hours) | Twice weekly while establishing; weekly thereafter | Mildly toxic to pets |
| Mrs D.F. Maxwell Cornish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Mugo Pine | Direct sun (at least 4-6 hours) | Water weekly while establishing the first year, then only in prolonged drought | Mildly toxic to pets |
| Muhly Grass | Direct sun (at least 4-6 hours) | Water regularly the first season to establish, then only in drought, roughly every 2 weeks | Mildly toxic to pets |
| Muir's Rhinephyllum | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring–summer; minimal in winter | Pet-safe |
| Muir's Sage | Direct sun (at least 4-6 hours) | Low; drought tolerant once established | Pet-safe |
| Mulanje Cycad | Direct sun (at least 4-6 hours) | Weekly to fortnightly in summer; every 3–4 weeks in winter | Toxic to pets |
| Mulberry Wine prickly heath | Bright indirect light (just back from a sunny window) | Regular; keep consistently moist | Toxic to pets |
| Mulu Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep medium evenly moist; water every 2–3 days | Mildly toxic to pets |
| Munby's Rock Rose | Direct sun (at least 4-6 hours) | Very low — drought-tolerant once established | Mildly toxic to pets |
| Musk Mallow | Direct sun (at least 4-6 hours) | Low to moderate once established | Pet-safe |
| Muster-John-Henry | Direct sun (at least 4-6 hours) | Once or twice weekly; allow the top 3 cm of soil to dry between waterings | Mildly toxic to pets |
| Myanmar Purple Ginger | Bright indirect light (just back from a sunny window) | Regular watering to maintain even soil moisture through the growing season. | Mildly toxic to pets |
| Myretoun Ruby winter heath | Direct sun (at least 4-6 hours) | Weekly for new plants in the first season; every 2–3 weeks for established plants during dry spells | Pet-safe |
| Myriophyllum aquaticum | Bright indirect light (just back from a sunny window) | Permanently in water; keep ponds topped up and stable | Mildly toxic to pets |
| Nahoum's Alcantarea | Direct sun (at least 4-6 hours) | Refill the central tank every 7-10 days; water substrate sparingly — only when completely dry | Pet-safe |
| Naked Bamboo | Medium indirect light (a couple of metres from a window) | 2-3 times per week in growing season; reduce in winter | Pet-safe |
| Naked Crocus | Bright indirect light (just back from a sunny window) | Low to moderate — prefers moisture during active growth; dry in summer | Mildly toxic to pets |
| Namaqualand Sage | Direct sun (at least 4-6 hours) | Low; sparingly once established | Pet-safe |
| Nananthus transvaalensis | Direct sun (at least 4-6 hours) | Only when soil is bone dry, about every 10-14 days in growth; minimal in summer and winter dormancy | Mildly toxic to pets |
| Nance | Direct sun (at least 4-6 hours) | Every 14–21 days; highly drought-tolerant when established | Pet-safe |
| Nandina Firepower | Direct sun (at least 4-6 hours) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Nandina Gulf Stream | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 10-14 days in dry spells | Toxic to pets |
| Nandina Harbour Dwarf | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Nandina Liriope | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Nandina Obsessed | Direct sun (at least 4-6 hours) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Nannorrhops Ritchiana | Direct sun (at least 4-6 hours) | When soil has dried out, roughly every 10-21 days in heat | Mildly toxic to pets |
| nannyberry | Bright indirect light (just back from a sunny window) | Weekly for first two seasons; infrequently once established | Mildly toxic to pets |
| Narrow Holly Fern | Medium indirect light (a couple of metres from a window) | Every 7–14 days; drought-tolerant once established | Pet-safe |
| Narrow Rib Cereus | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; once a month or less in winter | Mildly toxic to pets |
| narrow small-reed | Direct sun (at least 4-6 hours) | Keep constantly moist to wet; suited to boggy, saturated, or seasonally flooded soils | Pet-safe |
| Narrow-Leaf Bird of Paradise | Direct sun (at least 4-6 hours) | Allow soil to dry well between waterings; approximately every 10–21 days in the growing season, very infrequent in winter | Toxic to pets |
| Narrow-Leaf Coneflower | Direct sun (at least 4-6 hours) | Water to establish in year one, then only in prolonged drought | Pet-safe |
| Narrow-leaf Dioon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month in winter | Toxic to pets |
| Narrow-Leaf Fountain Bamboo | Medium indirect light (a couple of metres from a window) | 2-3 times per week in warm months; weekly in cool weather | Pet-safe |
| Narrow-leaf Zamia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks | Toxic to pets |
| Narrow-leaf Zinnia | Direct sun (at least 4-6 hours) | When top 3-4 cm of soil is dry, roughly every 5-10 days | Pet-safe |
| Narrow-Leaved Ash | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Narrow-leaved Biarum | Direct sun (at least 4-6 hours) | Light watering in autumn–spring active growth; completely dry in summer | Toxic to pets |
| Narrow-Leaved Evening Primrose | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Narrow-leaved Everlasting Pea | Bright indirect light (just back from a sunny window) | Low to moderate — water during prolonged drought only once established | Mildly toxic to pets |
| Narrow-leaved Fockea | Bright indirect light (just back from a sunny window) | Every 10–14 days in growing season; once a month or less in winter | Mildly toxic to pets |
| Narrow-leaved Glade Fern | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water when the top 2 cm begin to dry, roughly every 5-7 days in dry weather | Mildly toxic to pets |
| Narrow-Leaved Spleenwort | Low light (north window or shaded room) | Every 2–3 days in warm months; reduce in winter | Pet-safe |
| Narrow-leaved Water Plantain | Direct sun (at least 4-6 hours) | Marginal aquatic; submerged 0–20 cm over the crown | Mildly toxic to pets |
| Narrow-petal Frangipani | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter dormancy | Toxic to pets |
| Narrowleaf gazania | Direct sun (at least 4-6 hours) | Every 10–21 days once established; twice weekly when newly planted | Mildly toxic to pets |
| Narrowleaf Milkweed | Direct sun (at least 4-6 hours) | Low; drought-tolerant, minimal supplemental watering | Toxic to pets |
| Nasturtium | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Natai Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in warm conditions; every 14 days in cooler periods | Pet-safe |
| Natal Cycad | Direct sun (at least 4-6 hours) | Every 14–21 days (allow soil to dry between waterings) | Toxic to pets |
| Natal Plum Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days in growth | Pet-safe |
| Neanthe Bella Palm | Low light (north window or shaded room) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Nearly Wild Rose | Direct sun (at least 4-6 hours) | Deeply once a week, more in heat | Pet-safe |
| Neat Bulbophyllum | Medium indirect light (a couple of metres from a window) | Every 4–6 days; mounted plants may need more frequent misting | Pet-safe |
| Needle Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Needle Palm | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 5-7 days while actively growing | Mildly toxic to pets |
| Neli's Tongue Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in autumn and spring growing seasons; near-dry in summer dormancy and restricted in winter | Mildly toxic to pets |
| Nemesia 'Sunsatia Cranberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Nemesia strumosa 'Poetry Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Nepenthes 'Miranda' | Bright indirect light (just back from a sunny window) | Keep media constantly moist; water every 2-4 days with mineral-free water | Pet-safe |
| Nepenthes ampullaria | Bright indirect light (just back from a sunny window) | Keep the medium constantly moist, watering every 2-3 days; it likes more water than highland species | Pet-safe |
| Nepenthes copelandii | Bright indirect light (just back from a sunny window) | Keep evenly moist; water from above every 2-4 days, never leaving it standing in water | Mildly toxic to pets |
| Nepenthes dubia | Bright indirect light (just back from a sunny window) | Keep media evenly moist but never sodden; water from the top every 2-4 days | Mildly toxic to pets |
| Nepenthes hamata | Bright indirect light (just back from a sunny window) | Keep media moist; water every 2-3 days | Mildly toxic to pets |
| Nepenthes inermis | Bright indirect light (just back from a sunny window) | Keep media evenly moist, never waterlogged; water from the top every 2-4 days | Mildly toxic to pets |
| Nepenthes merrilliana | Bright indirect light (just back from a sunny window) | Keep the mix lightly moist at all times; water from the top every 2-4 days, never standing | Mildly toxic to pets |
| Nepenthes mikei | Bright indirect light (just back from a sunny window) | Keep media evenly moist but never sodden; water from the top every 2-4 days | Mildly toxic to pets |
| Nepenthes Miranda | Bright indirect light (just back from a sunny window) | Keep media damp; water every 2-4 days | Mildly toxic to pets |
| Nepenthes rafflesiana | Bright indirect light (just back from a sunny window) | Keep media constantly moist; water every 2-4 days | Mildly toxic to pets |
| Nepenthes rajah | Bright indirect light (just back from a sunny window) | Keep the medium evenly moist at all times, watering every 2-4 days so it never dries out | Pet-safe |
| Nepenthes robcantleyi | Bright indirect light (just back from a sunny window) | Keep media moist; water every 2-3 days | Mildly toxic to pets |
| Nepenthes Sanguinea | Bright indirect light (just back from a sunny window) | Keep the medium constantly damp; water roughly every 2-4 days so it never dries out | Mildly toxic to pets |
| Nepenthes spathulata | Bright indirect light (just back from a sunny window) | Keep media moist; water every 2-3 days | Mildly toxic to pets |
| Nepenthes talangensis | Bright indirect light (just back from a sunny window) | Keep media evenly moist, never waterlogged; water from the top every 2-4 days | Mildly toxic to pets |
| Nepenthes tentaculata | Bright indirect light (just back from a sunny window) | Keep the medium constantly moist, watering every 2-4 days so it never fully dries | Mildly toxic to pets |
| Nepenthes tenuis | Bright indirect light (just back from a sunny window) | Keep media evenly moist, never waterlogged; water from the top every 2-4 days | Mildly toxic to pets |
| Nepenthes truncata | Bright indirect light (just back from a sunny window) | Keep the medium evenly moist, watering every 2-4 days so it never fully dries | Pet-safe |
| Nepenthes veitchii | Bright indirect light (just back from a sunny window) | Keep media moist; water every 2-3 days | Mildly toxic to pets |
| Nepenthes villosa | Bright indirect light (just back from a sunny window) | Keep media moist; water every 2-3 days | Mildly toxic to pets |
| Nepeta 'Six Hills Giant' | Direct sun (at least 4-6 hours) | When soil is dry to a few centimetres; infrequently once established | Mildly toxic to pets |
| Nepeta 'Walker's Low' | Direct sun (at least 4-6 hours) | When the top few centimetres are dry; weekly while establishing | Mildly toxic to pets |
| Nepeta racemosa 'Blue Wonder' | Direct sun (at least 4-6 hours) | When the top few centimetres are dry; weekly while establishing | Mildly toxic to pets |
| Nepeta sibirica 'Souvenir d'André Chaudron' | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry; sparingly once established | Mildly toxic to pets |
| Nerved Catmint | Direct sun (at least 4-6 hours) | Every 7–10 days in the growing season; much less in winter | Pet-safe |
| Nesting Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in cool seasons | Pet-safe |
| net-vein camellia | Bright indirect light (just back from a sunny window) | Regularly; consistent moisture throughout the year | Mildly toxic to pets |
| Netted Chain Fern | Medium indirect light (a couple of metres from a window) | Keep continuously moist to wet; check every 3-5 days and never allow drying | Mildly toxic to pets |
| Netted Chain Fern | Low light (north window or shaded room) | Freely — keep soil moist to seasonally wet | Pet-safe |
| Nettle-leaved Mullein | Direct sun (at least 4-6 hours) | Every 10–14 days during dry spells; seldom needed once established | Mildly toxic to pets |
| Nevada Bitterroot | Direct sun (at least 4-6 hours) | Moderate in spring; completely dry in summer dormancy | Pet-safe |
| New Dawn Rose | Direct sun (at least 4-6 hours) | Deeply once a week in the growing season; more during establishment or drought | Pet-safe |
| New England Aster 'Purple Dome' | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply during dry spells, about weekly | Pet-safe |
| New Guinea Impatiens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 1-3 days in warm weather | Pet-safe |
| New Mexico Giant Hyssop | Direct sun (at least 4-6 hours) | Every 7–14 days once established | Pet-safe |
| New York aster | Direct sun (at least 4-6 hours) | Weekly during the growing season; less frequent once established in cool climates | Pet-safe |
| New York Ironweed | Direct sun (at least 4-6 hours) | Keep consistently moist; water weekly when rainfall is short | Mildly toxic to pets |
| New Zealand Everlasting Daisy | Direct sun (at least 4-6 hours) | Occasional; tolerant of dry spells once established | Mildly toxic to pets |
| New Zealand Snowberry | Medium indirect light (a couple of metres from a window) | Every 7 days during the growing season; reduce in winter | Mildly toxic to pets |
| New Zealand Tree Fuchsia | Bright indirect light (just back from a sunny window) | Regular — consistent moisture | Pet-safe |
| Nicaraguan Columnea | Bright indirect light (just back from a sunny window) | Every 5–8 days in growing season; every 10–14 days in winter | Pet-safe |
| Night-blooming Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce to every 10–14 days in cooler months | Toxic to pets |
| Nikko bog rosemary | Bright indirect light (just back from a sunny window) | Consistently moist; never dry out | Toxic to pets |
| Nikko Fir | Direct sun (at least 4-6 hours) | Weekly when establishing; reduced once established | Pet-safe |
| Nile Sage | Bright indirect light (just back from a sunny window) | Moderate; consistent moisture preferred | Pet-safe |
| Ninebark 'Diabolo' | Direct sun (at least 4-6 hours) | Weekly while establishing; established plants only in prolonged drought | Mildly toxic to pets |
| Ninja Foamflower | Medium indirect light (a couple of metres from a window) | Every 5–7 days; increase in warm or dry periods | Pet-safe |
| Ninja Tiarella | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water deeply once or twice a week during dry periods | Mildly toxic to pets |
| Nivalis flowering quince | Bright indirect light (just back from a sunny window) | Weekly during establishment; rainfall usually sufficient once established | Mildly toxic to pets |
| Noble Carrion Flower | Bright indirect light (just back from a sunny window) | Every 14–21 days in the growing season; once monthly or less in winter | Pet-safe |
| Noble Cymbidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; every 10–14 days in winter | Pet-safe |
| Noble Fir | Direct sun (at least 4-6 hours) | Regular watering during establishment; naturally sustained by Pacific Northwest rainfall | Pet-safe |
| Nodding Enkianthus | Bright indirect light (just back from a sunny window) | Regularly; maintain even soil moisture | Mildly toxic to pets |
| Nodding Sage | Direct sun (at least 4-6 hours) | Low to moderate; allow soil to dry between waterings | Pet-safe |
| Noni | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry out, about every 5-7 days | Mildly toxic to pets |
| Nootka Cypress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Mildly toxic to pets |
| Nootka Cypress | Direct sun (at least 4-6 hours) | Regularly during establishment; tolerates wet or dry once mature | Pet-safe |
| Nordmann Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; relies on rainfall once established | Pet-safe |
| Norstog's Ceratozamia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–5 weeks in winter | Toxic to pets |
| Northern Blazing Star | Direct sun (at least 4-6 hours) | Every 1-2 weeks once established; more often during establishment | Pet-safe |
| Northern Buckler Fern | Medium indirect light (a couple of metres from a window) | Weekly during the growing season; reduce significantly in winter | Mildly toxic to pets |
| Northern Japanese Hemlock | Bright indirect light (just back from a sunny window) | Weekly during growing season; less in winter | Pet-safe |
| Northern Lady Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days in warm weather; keep soil consistently moist but not waterlogged | Mildly toxic to pets |
| Northern Maidenhair Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days | Pet-safe |
| Northern Needleleaf Air Plant | Bright indirect light (just back from a sunny window) | Soak once a week; mist every 2–3 days | Pet-safe |
| Northern Red Oak | Direct sun (at least 4-6 hours) | Regular deep watering in the first 2-3 years; established trees are moderately drought-tolerant | Mildly toxic to pets |
| Northern Sea Oats | Bright indirect light (just back from a sunny window) | Water to keep soil moist, deeply once or twice weekly in dry periods | Mildly toxic to pets |
| Northwind Switch Grass | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water deeply every 1-2 weeks while young | Mildly toxic to pets |
| Northwind Switchgrass | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks when mature | Pet-safe |
| Notch Cactus | Bright indirect light (just back from a sunny window) | When the mix is fully dry, sparingly every 2-3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Notch-Tipped Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Notocactus Magnificus | Direct sun (at least 4-6 hours) | Soak-and-dry: water deeply only when the mix is completely dry, roughly every 10-14 days in summer | Mildly toxic to pets |
| Nottingham Catchfly | Bright indirect light (just back from a sunny window) | Low; allow soil to dry between waterings | Mildly toxic to pets |
| Novak's Air Plant | Bright indirect light (just back from a sunny window) | Mist thoroughly 2–3 times per week in warm conditions; reduce to once per week in cool, low-humidity winters. | Pet-safe |
| Nude Sheath Bamboo | Direct sun (at least 4-6 hours) | Weekly during the growing season; every 2–3 weeks when dormant | Pet-safe |
| Nummularioides Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-10 days in the growing season; roughly every 2 weeks in winter | Pet-safe |
| Nymphoides peltata | Direct sun (at least 4-6 hours) | Permanently submerged; maintain stable pond level | Mildly toxic to pets |
| Nyssa sylvatica | Direct sun (at least 4-6 hours) | Weekly while establishing; keep soil moist to wet | Mildly toxic to pets |
| Oak Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2 cm begins to dry, roughly weekly in dry weather | Mildly toxic to pets |
| Oak-leaf Primulina | Medium indirect light (a couple of metres from a window) | Allow soil to become fairly dry between waterings | Mildly toxic to pets |
| Oakleaf Hydrangea | Bright indirect light (just back from a sunny window) | Keep soil moist while establishing; then water deeply during dry spells, roughly weekly in summer heat | Toxic to pets |
| Oakleaf Hydrangea 'Snow Queen' | Bright indirect light (just back from a sunny window) | Roughly weekly, about 2.5 cm (1 inch) per week while establishing; deep-soak when the top 5 cm of soil dries | Toxic to pets |
| Oblong-leaf Sanchezia | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; every 10–14 days in winter | Mildly toxic to pets |
| Obscura Wax Plant | Bright indirect light (just back from a sunny window) | Every 10-14 days in growth; every 2-3 weeks in winter | Pet-safe |
| Ochre Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to once every 2–3 weeks in winter rest | Pet-safe |
| Ocotillo | Direct sun (at least 4-6 hours) | Rainfall-dependent; irrigate every 3–4 weeks in summer heat; minimal to none in cool months | Mildly toxic to pets |
| October Daphne | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; minimal in winter dormancy | Pet-safe |
| Ohio Goldenrod | Direct sun (at least 4-6 hours) | Moderate to high — keep soil consistently moist | Pet-safe |
| Ohio Spiderwort | Bright indirect light (just back from a sunny window) | Weekly to fortnightly; drought-tolerant once established | Mildly toxic to pets |
| Oklahoma Salmon zinnia | Direct sun (at least 4-6 hours) | Every 3–5 days; adjust for rainfall and temperature | Pet-safe |
| Old Father Live Forever | Bright indirect light (just back from a sunny window) | Water when the top 3–5 cm of compost is dry, roughly every 10–14 days; reduce in winter | Toxic to pets |
| Old Gold Juniper | Direct sun (at least 4-6 hours) | Water regularly the first season; afterward only during sustained drought | Toxic to pets |
| Old Lady Pincushion | Direct sun (at least 4-6 hours) | When the mix is completely dry, roughly every 2-3 weeks in summer; keep nearly dry in winter | Pet-safe |
| Old Man Cactus | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, very little in winter | Pet-safe |
| Old Man of the Andes | Direct sun (at least 4-6 hours) | When the soil has dried out, about every 2 weeks in summer; very sparingly in winter | Mildly toxic to pets |
| Old World Sago Cycad | Direct sun (at least 4-6 hours) | When the top 5 cm of mix is dry, roughly every 12-16 days in growth | Toxic to pets |
| old-fashioned weigela | Direct sun (at least 4-6 hours) | Weekly during the first growing season; once or twice per month during dry spells when established | Pet-safe |
| Oleander | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days once established | Toxic to pets |
| Olive Living Stones | Direct sun (at least 4-6 hours) | Seasonally — autumn watering only (September–November); completely dry during winter and summer dormancy | Pet-safe |
| Oliver's impatiens | Medium indirect light (a couple of metres from a window) | Every 4–7 days; moderate and consistent | Pet-safe |
| Olympic Mullein | Direct sun (at least 4-6 hours) | Every 14–21 days; very drought-tolerant once established | Mildly toxic to pets |
| Olympic St. John's Wort | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Toxic to pets |
| Onzuka Bishop's Cap | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| Ophir Mugo Pine | Direct sun (at least 4-6 hours) | Water weekly during the first growing season, then only in extended drought | Mildly toxic to pets |
| Opium poppy | Direct sun (at least 4-6 hours) | Weekly during establishment; every 10–14 days once growing strongly | Toxic to pets |
| Opposite-Flowered Sage | Direct sun (at least 4-6 hours) | Moderate; allow the top few centimetres of soil to dry between waterings | Mildly toxic to pets |
| Opposite-leaf Cliff Stonecrop | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; very rarely in winter | Pet-safe |
| Optical Plant | Direct sun (at least 4-6 hours) | Seasonally — water only during autumn active growth (September–November); completely dry rest of year | Pet-safe |
| Orache-Leaved Sun Rose | Direct sun (at least 4-6 hours) | Very low — once every 3–4 weeks in summer; rely on rainfall in other seasons | Mildly toxic to pets |
| Orange coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Orange New Zealand sedge | Bright indirect light (just back from a sunny window) | Regular watering until established; moderate thereafter | Pet-safe |
| Orange Queen Epimedium | Medium indirect light (a couple of metres from a window) | Weekly during establishment and dry spells; established clumps are notably drought-tolerant | Mildly toxic to pets |
| Orange River Climbing Onion | Bright indirect light (just back from a sunny window) | Every 1–2 weeks during active vine growth; completely dry during summer dormancy | Toxic to pets |
| Orange Stonecrop | Direct sun (at least 4-6 hours) | Every 10-14 days when establishing; virtually rain-fed once mature | Pet-safe |
| Orbea ciliata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; rarely in winter | Mildly toxic to pets |
| Orbea decaisneana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Orbea lutea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; rarely in winter | Mildly toxic to pets |
| Oregon Stonecrop | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; monthly or less in winter | Pet-safe |
| Oregon Woodsia | Medium indirect light (a couple of metres from a window) | Water every 7–14 days, less in winter | Pet-safe |
| Oreocereus trollii | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Organ Pipe Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 2 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Oriental Arborvitae | Direct sun (at least 4-6 hours) | Weekly when establishing (first 1–2 seasons); every 2–3 weeks once established; reduce in winter | Mildly toxic to pets |
| Oriental Chain Fern | Medium indirect light (a couple of metres from a window) | Regularly — keep soil consistently moist | Pet-safe |
| oriental fountain grass | Direct sun (at least 4-6 hours) | Every 10–14 days once established; more frequent during establishment | Pet-safe |
| Oriental Hornbeam | Direct sun (at least 4-6 hours) | Low once established; water during first 2 seasons only | Pet-safe |
| Oriental Spruce | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; regular moisture during first 2–3 years | Mildly toxic to pets |
| Oriental Sweetgum | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Mildly toxic to pets |
| Ornamental Plum 'Nigra' | Direct sun (at least 4-6 hours) | Weekly while establishing; little once mature | Toxic to pets |
| Ornate Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Orpen's Aloinopsis | Bright indirect light (just back from a sunny window) | Every 10–14 days in autumn–spring; minimal in summer | Pet-safe |
| Orpine | Direct sun (at least 4-6 hours) | Every 1–2 weeks during dry spells; drought-tolerant once established | Mildly toxic to pets |
| Orthophytum saxicola | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| Osbeck's Rock Rose | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Osmunda regalis 'Purpurascens' | Medium indirect light (a couple of metres from a window) | Keep soil constantly moist to wet; check every 2-3 days in growth | Mildly toxic to pets |
| Osmunda spectabilis | Medium indirect light (a couple of metres from a window) | Keep wet to consistently moist at all times; water whenever the surface is not damp | Pet-safe |
| Ospina's Vriesea | Bright indirect light (just back from a sunny window) | Keep cup filled; flush weekly; medium every 2 weeks | Pet-safe |
| Osteospermum 'Akila Daisy White' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 4-7 days | Pet-safe |
| Osteospermum 'Sunny Serena White' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Osteospermum 'Voltage Yellow' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Othello Ligularia | Medium indirect light (a couple of metres from a window) | Keep permanently moist; water deeply 2-3 times weekly, daily during heat | Mildly toxic to pets |
| Ovate Maiden Fern | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 2-3 cm begin to dry, roughly weekly in dry weather | Mildly toxic to pets |
| Overdam Feather Reed Grass | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks once established | Pet-safe |
| Owl Eyes Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 2-3 weeks in spring and summer; nearly dry in winter | Pet-safe |
| Ox Tongue | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Pet-safe |
| Oxeye daisy | Direct sun (at least 4-6 hours) | Minimal once established; water during prolonged drought only | Mildly toxic to pets |
| Oxlip | Medium indirect light (a couple of metres from a window) | Regularly; keep soil consistently moist, especially in summer | Mildly toxic to pets |
| Oxycardium | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Oxydendrum arboreum | Direct sun (at least 4-6 hours) | Weekly while establishing; regular watering in dry spells | Mildly toxic to pets |
| Pachycereus schottii | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer; sparingly in winter | Mildly toxic to pets |
| Pachyphytum bracteosum | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| Pachyphytum compactum | Direct sun (at least 4-6 hours) | When soil is bone dry, about every 2 weeks in growth and rarely in winter | Pet-safe |
| Pachyphytum glutinicaule | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, very sparingly in winter | Pet-safe |
| Pachyphytum hookeri | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Pachyphytum werdermannii | Direct sun (at least 4-6 hours) | When soil is bone dry, roughly every 2 weeks in growth, rarely in winter | Pet-safe |
| Pachyveria 'Clavifolia' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| Pachyveria 'Exotica' | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in growth, minimal in winter | Pet-safe |
| Pachyveria 'Powder Puff' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Pachyveria 'Powder Puff' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| Pacific Dogwood | Bright indirect light (just back from a sunny window) | Regular deep watering, especially in summer; do not let the root zone dry out | Pet-safe |
| Pacific Maid Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days; keep evenly moist | Pet-safe |
| Pacific Silver Fir | Bright indirect light (just back from a sunny window) | Regularly during establishment; relies on natural rainfall when mature | Pet-safe |
| Pacific Yew | Low light (north window or shaded room) | Weekly during establishment; every 2 weeks once established | Toxic to pets |
| Pacifica Vinca | Direct sun (at least 4-6 hours) | Every 3–5 days outdoors in summer heat; allow topsoil to partially dry between waterings | Toxic to pets |
| Padang Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in growth; every 3–4 weeks in winter | Pet-safe |
| Paddle Plant (Flapjacks) | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Paeonia lactiflora 'Karl Rosenfield' | Direct sun (at least 4-6 hours) | Deeply about once a week during active growth; reduce after dormancy | Toxic to pets |
| Pagoda Dogwood | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply weekly in the first two seasons and during droughts | Pet-safe |
| Painted Columnea | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in winter | Pet-safe |
| Painted Daisy | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce after flowering and in winter | Mildly toxic to pets |
| Painted Echeveria | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Painted Lady Gladiolus | Direct sun (at least 4-6 hours) | Moderate during autumn–spring growing season; completely dry in summer dormancy | Toxic to pets |
| Pale Beardtongue | Direct sun (at least 4-6 hours) | Low; highly drought-tolerant once established | Mildly toxic to pets |
| Pale Purple Coneflower | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry; weekly while establishing, then rarely | Pet-safe |
| Pale Silver Skin Plant | Direct sun (at least 4-6 hours) | Every 2–4 weeks in late summer through autumn (active growth into flowering); water sparingly in spring; completely withheld mid-summer | Pet-safe |
| Pale Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more frequent in first season | Pet-safe |
| Pale-Leaved Sunflower | Direct sun (at least 4-6 hours) | Weekly until established, then every 1-2 weeks | Pet-safe |
| Pale-Spike Lobelia | Bright indirect light (just back from a sunny window) | Moderate; keep moist but tolerates brief dry spells | Toxic to pets |
| Palinha's Rock Rose | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| palm sedge | Medium indirect light (a couple of metres from a window) | Consistently moist; water whenever the top 2 cm of soil dries | Pet-safe |
| Palm sedge | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the top 1–2 cm of soil dries out | Pet-safe |
| Palmate Begonia | Medium indirect light (a couple of metres from a window) | Every 6–8 days in growing season; reduce to every 10–14 days in winter | Toxic to pets |
| Palmer's Indian Mallow | Direct sun (at least 4-6 hours) | Low; deep, infrequent irrigation once established | Mildly toxic to pets |
| Palo Alto Sweetgum | Direct sun (at least 4-6 hours) | Regular in first 2–3 years; moderate once established | Mildly toxic to pets |
| Palo Santo | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; thereafter only in prolonged drought | Pet-safe |
| Panama Rose | Direct sun (at least 4-6 hours) | Every 5–7 days; allow topsoil to dry slightly between waterings | Mildly toxic to pets |
| Panama Rose Shrub | Direct sun (at least 4-6 hours) | Once per week during dry seasons; minimal during wet seasons | Mildly toxic to pets |
| Panda Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Panicle Hydrangea 'Pinky Winky' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 3-5 days in summer | Toxic to pets |
| Panicle Hydrangea 'Pinky Winky' | Direct sun (at least 4-6 hours) | When the top 2-4 cm of soil is dry, regularly through summer | Toxic to pets |
| Panicle Hydrangea 'Vanilla Strawberry' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 3-5 days in summer | Toxic to pets |
| Panicled Corn Lily | Direct sun (at least 4-6 hours) | Moderate in autumn-to-spring growth; completely dry in summer | Mildly toxic to pets |
| Paper Birch | Direct sun (at least 4-6 hours) | Weekly in the first 3 years; every 10–14 days once established, more in summer heat | Pet-safe |
| Paper Spine Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer and roughly monthly or less in winter | Pet-safe |
| Paprika yarrow | Direct sun (at least 4-6 hours) | Water when top 5–8 cm of soil is dry; drought-tolerant once established | Mildly toxic to pets |
| Parallel-Stripe Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Parker's jasmine | Bright indirect light (just back from a sunny window) | Every 10–14 days; highly drought-tolerant once established | Mildly toxic to pets |
| Parrot Feather Bromeliad | Bright indirect light (just back from a sunny window) | Keep cup filled; medium watering every 2 weeks | Pet-safe |
| Parrotia persica | Direct sun (at least 4-6 hours) | Weekly while establishing in the first 2-3 years; rarely thereafter | Mildly toxic to pets |
| Parsons Juniper | Direct sun (at least 4-6 hours) | Water deeply during the first season; afterward only in extended drought | Toxic to pets |
| Parthenocissus henryana | Bright indirect light (just back from a sunny window) | Keep young plants moist; water established plants only in drought | Toxic to pets |
| Parthenocissus quinquefolia | Bright indirect light (just back from a sunny window) | Water through the first one to two seasons, then only in drought | Toxic to pets |
| Parthenocissus tricuspidata | Bright indirect light (just back from a sunny window) | Water young plants in dry spells until established, then rarely | Toxic to pets |
| Partridge Pea | Direct sun (at least 4-6 hours) | Low; water during establishment then rely on rainfall | Mildly toxic to pets |
| Partridgeberry | Low light (north window or shaded room) | Keep soil evenly moist; water when the top 1–2 cm begins to dry | Pet-safe |
| Passiflora alata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 4-7 days in active growth | Mildly toxic to pets |
| Passiflora incarnata | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in summer | Mildly toxic to pets |
| Pat Austin Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in hot, dry spells | Pet-safe |
| Pau's Germander | Direct sun (at least 4-6 hours) | Very infrequently; relies on natural rainfall once established | Mildly toxic to pets |
| Paul's Himalayan Musk Rose | Direct sun (at least 4-6 hours) | Deep soak weekly through the first two growing seasons; established plants rarely need watering | Pet-safe |
| Paulownia tomentosa | Direct sun (at least 4-6 hours) | Water weekly while establishing in the first two seasons, then rely largely on rainfall | Mildly toxic to pets |
| Peacock fern | Low light (north window or shaded room) | Keep the substrate evenly moist at all times — never let it dry out | Pet-safe |
| Peacock Moraea | Direct sun (at least 4-6 hours) | Regular watering autumn to late spring; completely dry in summer | Toxic to pets |
| Peacock Pink | Direct sun (at least 4-6 hours) | Low; allow soil to dry thoroughly between waterings | Mildly toxic to pets |
| Pearl Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in summer, minimal in winter | Pet-safe |
| Pearl Plant | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Pet-safe |
| Pearson's Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn to early spring); once per month or less in summer | Toxic to pets |
| Peculiar Cheiridopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn–spring; none in summer | Pet-safe |
| Pedalai | Direct sun (at least 4-6 hours) | Water 3–4 times per week for young trees; established trees in ground need weekly deep irrigation supplemented by natural rainfall. | Pet-safe |
| Pelargonium 'Ardens' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; minimal in summer rest | Toxic to pets |
| Pelargonium 'Distinction' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Dolly Varden' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-7 days in growth | Toxic to pets |
| Pelargonium 'Frank Headley' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Happy Thought' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Occold Lagoon' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 4-7 days in summer | Toxic to pets |
| Pelargonium 'Paul Crampel' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Stellar Hannaford Star' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium carnosum | Direct sun (at least 4-6 hours) | When the gritty mix is fully dry, about every 10-14 days in growth; sparingly in summer dormancy | Toxic to pets |
| Pelargonium gibbosum | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth; much less in summer dormancy | Toxic to pets |
| Pellionia daveauana | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, often every 4-7 days | Pet-safe |
| Pelotazo Mallow | Direct sun (at least 4-6 hours) | Every 10–21 days in summer; monthly or less in winter | Pet-safe |
| Peltate-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days during the growing season; every 3–4 weeks in winter | Pet-safe |
| Pemba Palm | Bright indirect light (just back from a sunny window) | Every 4–6 days in warm months; reduce to every 10–14 days in cooler periods | Pet-safe |
| Pencil Cactus (Firestick) | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Pencil Pine | Bright indirect light (just back from a sunny window) | Keep permanently moist; never let it dry out, watering deeply during any dry period | Mildly toxic to pets |
| Pencil-leaf Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn–spring); once per month in summer | Toxic to pets |
| Pencilled Cranesbill | Medium indirect light (a couple of metres from a window) | Occasional watering during establishment; largely self-sufficient once established | Pet-safe |
| Penisetum massaicum Red Bunny Tails | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about weekly; more often in pots and heat | Pet-safe |
| Pennsylvania Sedge | Medium indirect light (a couple of metres from a window) | Water to establish, then largely self-sufficient; occasional deep watering in extended drought | Mildly toxic to pets |
| Penstemon 'Garnet' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries, roughly weekly in summer | Mildly toxic to pets |
| Penstemon 'Husker Red' | Direct sun (at least 4-6 hours) | Water to establish, then only during prolonged drought; drought-tolerant once settled | Mildly toxic to pets |
| Penstemon 'Stapleford Gem' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly weekly in summer, less in cool spells | Mildly toxic to pets |
| Penstemon barbatus 'Rondo' | Direct sun (at least 4-6 hours) | Water to establish, then sparingly; drought-tolerant once established | Mildly toxic to pets |
| Penstemon heterophyllus 'Electric Blue' | Direct sun (at least 4-6 hours) | Water to establish, then minimally; highly drought-tolerant once settled | Mildly toxic to pets |
| Peony | Direct sun (at least 4-6 hours) | Deep watering once a week in dry spells | Toxic to pets |
| Peony 'Sarah Bernhardt' | Direct sun (at least 4-6 hours) | Deeply once a week during active growth and budding, more in drought; reduce after flowering and through dormancy | Toxic to pets |
| Peperomia | Medium indirect light (a couple of metres from a window) | When the soil is almost fully dry, every 10-14 days | Pet-safe |
| Peperomia 'Napoli Nights' | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia 'Peppermill' | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia 'Rana Verde' | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia 'Watermelon' (Ginny hybrid) | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia albovittata | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia angulata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia argyreia 'Soccer Ball' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia arifolia | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia asperula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days | Pet-safe |
| Peperomia clusiifolia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia columella | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-21 days in growth | Pet-safe |
| Peperomia crassifolia | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia deppeana | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia dolabriformis | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 14-21 days | Pet-safe |
| Peperomia ecklonii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia emarginella | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is just drying, about every 5-9 days | Pet-safe |
| Peperomia graveolens 'Ruby Glow' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-18 days | Pet-safe |
| Peperomia magnoliifolia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia magnoliifolia 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 8-13 days | Pet-safe |
| Peperomia nitida 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia obtusifolia 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia Pepperspot | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 7-12 days | Pet-safe |
| Peperomia pereskiifolia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia Rosso | Bright indirect light (just back from a sunny window) | When the soil is 50-75% dry, roughly every 10-14 days | Pet-safe |
| Peperomia scandens | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia serpens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia tetragona | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia tetraphylla | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia trifolia | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia verticillata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Pepino Dulce | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply every 2-4 days in summer, more in containers | Toxic to pets |
| Peregrina | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; every 2–3 weeks in winter | Toxic to pets |
| Perennial Candytuft | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Pereskia-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Perez's Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established; less in winter | Pet-safe |
| Perfoliate Bellwort | Medium indirect light (a couple of metres from a window) | Moderate in spring; established plants are drought-tolerant once dormant. | Pet-safe |
| Perplexing Rebutia | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn; once monthly or none in winter | Pet-safe |
| Persian Barrenwort | Medium indirect light (a couple of metres from a window) | Weekly for the first 1–2 seasons; established plants need watering only during extreme drought | Mildly toxic to pets |
| Persian Carpet zinnia | Direct sun (at least 4-6 hours) | Every 5–7 days; highly drought tolerant once established | Pet-safe |
| Persian Catmint | Direct sun (at least 4-6 hours) | Every 7–14 days; less in cooler seasons | Pet-safe |
| Persian Jewels love-in-a-mist | Direct sun (at least 4-6 hours) | Weekly | Mildly toxic to pets |
| Persian Rosularia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season; once a month or less in winter | Mildly toxic to pets |
| Persicaria amplexicaulis 'Alba' | Direct sun (at least 4-6 hours) | Keep soil moist; water every 3-5 days in dry spells, especially in sun | Mildly toxic to pets |
| Persicaria amplexicaulis 'Blackfield' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days during dry weather | Mildly toxic to pets |
| Persicaria amplexicaulis 'Firetail' | Direct sun (at least 4-6 hours) | Keep evenly moist; water whenever the surface starts to dry, more in heat | Mildly toxic to pets |
| Peruvian Apple Cactus | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Pet-safe |
| Peruvian bougainvillea | Direct sun (at least 4-6 hours) | Every 7–10 days in active growth; every 3–4 weeks when dry-stressed to trigger blooming | Mildly toxic to pets |
| Peruvian zinnia | Direct sun (at least 4-6 hours) | Once or twice weekly; allow the top 3 cm of soil to dry between waterings | Pet-safe |
| Petiole Sundew | Bright indirect light (just back from a sunny window) | Wet tray (October–March in Australia / spring–autumn in cultivation); reduced watering (cooler months) | Pet-safe |
| Petra Croton | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Petunia 'Supertunia Royal Velvet' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, frequently daily for containers in summer | Pet-safe |
| Petunia 'Supertunia Vista Bubblegum' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, often daily for containers in summer heat | Pet-safe |
| Petunia axillaris | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry; avoid both drought and waterlogging | Pet-safe |
| Peyote | Direct sun (at least 4-6 hours) | Sparingly: only when soil is fully dry, roughly every 2-3 weeks in summer, none in winter | Toxic to pets |
| Pflanz's Chin Cactus | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn; almost none in winter | Pet-safe |
| Pheasant Tail Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Mildly toxic to pets |
| Pheasant's Tail Grass | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; minimal in winter | Pet-safe |
| Phegopteris connectilis | Low light (north window or shaded room) | Keep soil evenly moist; water when the top 1-2 cm begins to dry, roughly every 4-6 days in growth | Pet-safe |
| Phegopteris hexagonoptera | Low light (north window or shaded room) | Keep consistently moist; water when the surface starts to dry, about every 4-6 days during growth | Pet-safe |
| Philadelphus 'Snowbelle' | Direct sun (at least 4-6 hours) | Weekly while establishing, then in dry spells | Mildly toxic to pets |
| Philadelphus 'Virginal' | Direct sun (at least 4-6 hours) | Weekly while establishing, then occasional deep watering | Mildly toxic to pets |
| Philadelphus microphyllus | Direct sun (at least 4-6 hours) | Occasional deep soak once established | Mildly toxic to pets |
| Philippe Vapelle Cranesbill | Bright indirect light (just back from a sunny window) | Moderate; water during extended dry spells | Mildly toxic to pets |
| Philodendron 'Florida Green' | Bright indirect light (just back from a sunny window) | Roughly weekly in spring/summer, every 10-14 days in winter | Toxic to pets |
| Philodendron Andreanum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron atabapoense | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Billietiae | Bright indirect light (just back from a sunny window) | Every 7-14 days in the growing season; roughly every 2-3 weeks in winter | Toxic to pets |
| Philodendron Domesticum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Martianum | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, about every 7-10 days | Toxic to pets |
| Philodendron Moonshine | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7 days | Toxic to pets |
| Philodendron Painted Lady × erubescens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7 days | Toxic to pets |
| Philodendron paraiso verde | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron scandens | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Selloum (Tree Philodendron) | Bright indirect light (just back from a sunny window) | When the top 2-3cm of compost feels dry, roughly weekly in summer | Toxic to pets |
| Philodendron Squamiferum | Bright indirect light (just back from a sunny window) | When the top 2.5-5 cm (1-2 in) of soil dries out, roughly weekly in summer and every 10-14 days in winter | Toxic to pets |
| Philodendron Tortum (Fernleaf) | Bright indirect light (just back from a sunny window) | When the top 3-5 cm (1-2 inches) of mix are dry, roughly every 5-7 days in summer and every 10-14 days in winter | Toxic to pets |
| Phlomis-Like Sage | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Phlox drummondii 'Intensia Cabernet' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Phlox maculata 'Alpha' | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply 1-2 times weekly in dry spells, more in heat | Pet-safe |
| Phlox paniculata 'Starfire' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply about weekly, more in heat and drought | Pet-safe |
| Phlox subulata 'Emerald Blue' | Direct sun (at least 4-6 hours) | Water when soil is dry; drought-tolerant once established | Pet-safe |
| Phoenicean Juniper | Direct sun (at least 4-6 hours) | Water weekly when young; essentially rainfall-dependent once established | Mildly toxic to pets |
| Phragmipedium caudatum | Bright indirect light (just back from a sunny window) | Keep the medium constantly moist, watering every 2-4 days as needed | Mildly toxic to pets |
| Phragmipedium Eric Young | Bright indirect light (just back from a sunny window) | Keep evenly moist at all times; water every 2-4 days or stand the pot in 1-2 cm of water | Pet-safe |
| Phragmites australis | Direct sun (at least 4-6 hours) | Keep wet to shallowly flooded year-round | Mildly toxic to pets |
| Physocarpus opulifolius 'Center Glow' | Direct sun (at least 4-6 hours) | Water weekly during the first year; established plants are drought-tolerant and need water only in extended dry spells | Mildly toxic to pets |
| Physocarpus opulifolius 'Coppertina' | Direct sun (at least 4-6 hours) | Weekly while establishing; every 1-2 weeks in dry spells once mature | Mildly toxic to pets |
| Physocarpus opulifolius 'Little Devil' | Direct sun (at least 4-6 hours) | Weekly while establishing; every 1-2 weeks in dry spells once mature | Mildly toxic to pets |
| Physocarpus opulifolius 'Summer Wine' | Direct sun (at least 4-6 hours) | Weekly while establishing; every 1-2 weeks in dry spells once mature | Mildly toxic to pets |
| Piaranthus geminatus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Piaranthus punctatus | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Pickle Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks; reduce to monthly or less in winter | Pet-safe |
| Pieris japonica Valley Rose | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 3-4 cm is dry, roughly weekly while establishing | Toxic to pets |
| Pierre's Stephania | Bright indirect light (just back from a sunny window) | Every 7–14 days in active growth; none in winter dormancy | Toxic to pets |
| Pilea cadierei 'Minima' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pilea pubescens | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pilea pumila | Medium indirect light (a couple of metres from a window) | Keep consistently moist; check every 2-4 days | Pet-safe |
| Pilea serpyllacea | Bright indirect light (just back from a sunny window) | When the surface just begins to dry, roughly every 4-7 days | Pet-safe |
| Pin Oak | Direct sun (at least 4-6 hours) | Regular watering during establishment; tolerates periodic waterlogging and moist soils once established | Mildly toxic to pets |
| Pincushion Cactus | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; monthly or less in autumn; none in winter | Pet-safe |
| Pincushion flower | Direct sun (at least 4-6 hours) | Once or twice weekly | Pet-safe |
| Pincushion Flower | Direct sun (at least 4-6 hours) | Water regularly while establishing, then when the top few centimetres of soil are dry | Mildly toxic to pets |
| Pindo Palm | Direct sun (at least 4-6 hours) | Weekly while establishing; deeply but infrequently once mature | Mildly toxic to pets |
| Pineapple Bromeliad | Bright indirect light (just back from a sunny window) | every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Pineapple Upsidedown Cake Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, about every 5-7 days during active growth | Toxic to pets |
| Pineapple-Head Ginger | Medium indirect light (a couple of metres from a window) | Regular during the growing season; reduce in winter but do not allow complete drydown. | Mildly toxic to pets |
| Pinel's Aechmea | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); replenish central cup every 2–4 weeks | Pet-safe |
| Pineleaf Penstemon | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; rarely in winter | Pet-safe |
| Pinemat manzanita | Direct sun (at least 4-6 hours) | Low to moderate; allow soil to dry between waterings once established | Pet-safe |
| Ping Pong Purple globe amaranth | Direct sun (at least 4-6 hours) | Every 5–7 days; allow soil surface to dry slightly | Pet-safe |
| Pink Bower Vine | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Mildly toxic to pets |
| Pink Butterflies Kalanchoe | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in summer; far less in winter | Toxic to pets |
| Pink Cascade Tamarisk | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Pink Coreopsis | Direct sun (at least 4-6 hours) | Moderate to high; keep soil evenly moist | Pet-safe |
| Pink Dipladenia | Direct sun (at least 4-6 hours) | Every 5–7 days in summer; every 10–14 days in winter | Mildly toxic to pets |
| Pink Evening Primrose | Direct sun (at least 4-6 hours) | Every 1–2 weeks once established; less in cool periods | Mildly toxic to pets |
| Pink Fawn Lily | Medium indirect light (a couple of metres from a window) | Regular watering in spring; minimal to none during summer dormancy | Mildly toxic to pets |
| Pink Flowering Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering; increase in summer heat | Pet-safe |
| Pink Ice Plant | Direct sun (at least 4-6 hours) | Weekly in spring and summer growing season; every 2–3 weeks in autumn; rarely in winter | Mildly toxic to pets |
| Pink Knock Out Rose | Direct sun (at least 4-6 hours) | About 2.5 cm of water weekly, deep soak | Pet-safe |
| Pink Kopsia | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil consistently moist but not waterlogged | Toxic to pets |
| Pink Lady flowering quince | Bright indirect light (just back from a sunny window) | Weekly when establishing; fortnightly in dry weather once established | Mildly toxic to pets |
| Pink Mandevilla | Direct sun (at least 4-6 hours) | 2-3 times per week in active growth, every 10-14 days in winter | Mildly toxic to pets |
| Pink mountain heather | Direct sun (at least 4-6 hours) | Consistently moist throughout the growing season; less in winter | Mildly toxic to pets |
| Pink Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; afterwards only in prolonged drought | Pet-safe |
| Pink Panther episcia | Bright indirect light (just back from a sunny window) | Allow the top centimetre of soil to dry before watering — approximately every 5–7 days in the growing season. | Pet-safe |
| Pink Panther Restrepia | Medium indirect light (a couple of metres from a window) | Every 1–2 days; allow the medium to approach dryness but not fully dry | Pet-safe |
| Pink Pewter Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–10 days; increase in dry or sunny spells | Pet-safe |
| Pink Porcelain Lily | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer; reduce in winter | Mildly toxic to pets |
| Pink Pussytoes | Direct sun (at least 4-6 hours) | Low; water only when soil is completely dry | Pet-safe |
| Pink Spot Begonia | Bright indirect light (just back from a sunny window) | Every 5–8 days, keeping soil evenly moist but not waterlogged | Toxic to pets |
| Pink Spur Flower | Medium indirect light (a couple of metres from a window) | Moderate — water when top 3 cm of soil dries out | Mildly toxic to pets |
| Pink Trumpet Vine | Direct sun (at least 4-6 hours) | Every 7 days in summer; every 14–21 days in winter | Mildly toxic to pets |
| Pink Variable Heron's Bill | Direct sun (at least 4-6 hours) | Low — infrequent, allowing soil to dry between waterings | Mildly toxic to pets |
| Pink Vygie | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; monthly or less in winter | Mildly toxic to pets |
| Pinwheel Flower | Bright indirect light (just back from a sunny window) | Once or twice per week during active growth; reduce in winter | Toxic to pets |
| Piper's Bellflower | Direct sun (at least 4-6 hours) | Sparingly; allow near-drying between waterings | Pet-safe |
| Pipsissewa | Low light (north window or shaded room) | Sparingly — allow soil to dry almost completely between waterings; low water requirement | Mildly toxic to pets |
| Pires's Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; very sparingly during dormancy | Mildly toxic to pets |
| Pirri-Pirri Bur | Direct sun (at least 4-6 hours) | Fortnightly once established; drought-tolerant | Pet-safe |
| Pitaya Agria | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; every 4–6 weeks in winter | Mildly toxic to pets |
| Pitcher Sage | Medium indirect light (a couple of metres from a window) | Every 2–4 weeks once established; deep water at planting | Mildly toxic to pets |
| Pitton's Houseleek | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Pet-safe |
| PJM rhododendron | Bright indirect light (just back from a sunny window) | Weekly during establishment and dry spells; every 2 weeks once established | Toxic to pets |
| Plaid Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth; minimal in winter | Pet-safe |
| Plains Coreopsis | Direct sun (at least 4-6 hours) | Low; once established, water only during prolonged drought | Pet-safe |
| Plains Prickly Pear | Direct sun (at least 4-6 hours) | Every 2-3 weeks in the growing season (spring–summer); withhold almost entirely in autumn and winter | Mildly toxic to pets |
| Plantain Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established | Mildly toxic to pets |
| Plantain-leaved Pussytoes | Bright indirect light (just back from a sunny window) | Low; drought-tolerant once established | Pet-safe |
| Plantain-Leaved Sedge | Low light (north window or shaded room) | Keep soil consistently moist; do not allow to dry out | Pet-safe |
| Plastic Plant Orchid | Bright indirect light (just back from a sunny window) | Every 4–7 days in growth; every 10–14 days in winter | Pet-safe |
| Playboy Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | Pet-safe |
| Pleasant Air Plant | Direct sun (at least 4-6 hours) | Mist every 2–3 days in summer; once a week in winter. | Mildly toxic to pets |
| Pleasant Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn growth; none in summer | Pet-safe |
| Plectranthus scutellarioides 'Black Dragon' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Freckles' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Kong Rose' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Rainbow Festive Dance' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Wizard Scarlet' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Pleiospilos compactus | Direct sun (at least 4-6 hours) | Seasonally: water in spring and autumn when soil is dry; keep nearly dry in mid-summer and winter | Pet-safe |
| Pleiospilos nelii 'Royal Flush' | Direct sun (at least 4-6 hours) | Sparingly; soak only when soil is fully dry and leaves slightly wrinkle, roughly every 3-4 weeks in growth | Mildly toxic to pets |
| Pleurothallis grobyi | Low light (north window or shaded room) | Keep roots evenly moist; water every 2-3 days potted, or mist/water mounted plants daily | Mildly toxic to pets |
| Pleurothallis restrepioides | Low light (north window or shaded room) | Keep evenly moist, watering roughly every 2-3 days; do not allow a hard dry-out | Mildly toxic to pets |
| Pleurothallis truncata | Low light (north window or shaded room) | Keep evenly moist; water every 2-3 days potted or mist mounted plants daily | Mildly toxic to pets |
| Ploughman's Spikenard | Direct sun (at least 4-6 hours) | Low — water every 2–3 weeks in dry spells once established | Mildly toxic to pets |
| Plover Eggs | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (spring–autumn); once a month or less in winter | Pet-safe |
| Plumed cockscomb | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Plumed Palm | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; every 10–14 days in cooler months | Pet-safe |
| Plumose Shield Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Podophylla Rodgersia | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply 1-2 times weekly, more in heat | Mildly toxic to pets |
| Pogge's Cycad | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly in winter | Toxic to pets |
| Pohl's Air Plant | Bright indirect light (just back from a sunny window) | Soak for 20–30 minutes once per week, or mist thoroughly 2–3 times per week; reduce frequency in cool winter months. | Pet-safe |
| Point Reyes bearberry | Direct sun (at least 4-6 hours) | Low once established; water weekly for the first 1–2 seasons | Pet-safe |
| Pointed-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Pointed-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Poisonous Adenia | Direct sun (at least 4-6 hours) | Every 2–4 weeks during summer growing season; completely withheld in winter | Toxic to pets |
| Poke Milkweed | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water during dry spells, especially in sunnier sites | Toxic to pets |
| Poker alumroot | Bright indirect light (just back from a sunny window) | Every 7–14 days once established; more frequent when young | Pet-safe |
| Polka dot begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in summer and every 10-14 days in winter | Toxic to pets |
| Polynesian Davallia | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer, every 10–14 days in winter | Pet-safe |
| Polypodium cambricum | Bright indirect light (just back from a sunny window) | Water during its winter growing season when the top few cm dry; keep drier in summer dormancy | Mildly toxic to pets |
| Polypodium cambricum 'Cambricum' | Bright indirect light (just back from a sunny window) | Water through its autumn-to-spring growing season when the top few cm dry; keep drier in summer | Mildly toxic to pets |
| Polypody Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of medium is dry, roughly every 7-10 days | Pet-safe |
| Polystichum neolobatum | Low light (north window or shaded room) | Keep consistently moist; water every 5-7 days in dry conditions | Pet-safe |
| Polystichum setiferum 'Divisilobum' | Low light (north window or shaded room) | Keep evenly moist; water deeply during dry spells, roughly weekly in summer | Pet-safe |
| Pomegranate Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 2-5 days in summer heat | Mildly toxic to pets |
| Pomelo | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 5-10 days | Toxic to pets |
| Pond Apple | Direct sun (at least 4-6 hours) | Keep soil consistently moist to wet; tolerates periodic flooding | Mildly toxic to pets |
| Pony Tails Grass | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing, then minimal | Mildly toxic to pets |
| Ponytail palm | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 2-3 weeks | Pet-safe |
| Poplar-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Low — establishment watering then rain-fed | Mildly toxic to pets |
| Porcupine Grass | Direct sun (at least 4-6 hours) | Weekly during the first growing season; once established, every 2–3 weeks or during prolonged drought. | Mildly toxic to pets |
| Port St. Johns Creeper | Direct sun (at least 4-6 hours) | Every 7 days during active growth; reduce in winter | Mildly toxic to pets |
| Portuguese heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2 weeks in the first summer; drought-tolerant once established | Pet-safe |
| Portulaca grandiflora 'Sundial Mango' | Direct sun (at least 4-6 hours) | When the soil is dry several centimetres down, roughly every 7-10 days; less in cool spells | Toxic to pets |
| Portulaca oleracea 'Fairytales Cinderella' | Direct sun (at least 4-6 hours) | When the soil has dried several centimetres down, about every 7-10 days; more often only in extreme heat | Toxic to pets |
| Pothos N'Joy | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Pothos-leaf Labisia | Low light (north window or shaded room) | Water when the top 1–2 cm of medium begins to dry; every 4–7 days depending on temperature and pot size | Mildly toxic to pets |
| Powder Puff Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 2-3 weeks in spring and summer; little to none in winter | Pet-safe |
| Powdery Echeveria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 12-16 days; it is unusually drought-tolerant | Pet-safe |
| PowWow Wild Berry coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2 weeks once established in dry spells | Pet-safe |
| Prairie Azure Sage | Direct sun (at least 4-6 hours) | Fortnightly once established | Pet-safe |
| Prairie Beardtongue | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Prairie Blazing Star | Direct sun (at least 4-6 hours) | Moderate; weekly during establishment; drought-tolerant once established | Pet-safe |
| Prairie Coreopsis | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Prairie Dock | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | Pet-safe |
| Prairie Dropseed | Direct sun (at least 4-6 hours) | Water regularly the first year to establish, then only in extended drought, roughly every 2-3 weeks | Mildly toxic to pets |
| Prairie Fire Switch Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; thereafter only in extended drought | Mildly toxic to pets |
| Prairie Gentian | Direct sun (at least 4-6 hours) | Low — drought tolerant once established | Pet-safe |
| Prairie Goldenrod | Direct sun (at least 4-6 hours) | Low — water only to establish; drought-tolerant once rooted | Pet-safe |
| Prairie Heart-Leaved Aster | Direct sun (at least 4-6 hours) | Low to moderate — drought tolerant | Pet-safe |
| Prairie June Grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; withhold water during summer dormancy | Pet-safe |
| Prairie Milkweed | Direct sun (at least 4-6 hours) | Moderate; tolerates moist conditions better than most milkweeds | Toxic to pets |
| Prairie Penstemon | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly during establishment | Pet-safe |
| Prairie Rosinweed | Direct sun (at least 4-6 hours) | Water to establish, then only in extended drought; drought-tolerant once rooted | Mildly toxic to pets |
| Prairie Sky switch grass | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water deeply every 1-2 weeks while young | Mildly toxic to pets |
| Prairie Sky Switchgrass | Direct sun (at least 4-6 hours) | Weekly during first season; every 2–3 weeks once established | Pet-safe |
| Prairie Smoke | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought; drought-tolerant once rooted | Mildly toxic to pets |
| Prairie Violet | Bright indirect light (just back from a sunny window) | Fortnightly or less once established; drought-tolerant | Pet-safe |
| Pretty Crocus | Direct sun (at least 4-6 hours) | Low — rainfall-dependent during active growth; fully dry during summer dormancy | Mildly toxic to pets |
| Pretty Peacock Ginger | Medium indirect light (a couple of metres from a window) | Regular during the growing season (spring to autumn); minimal to none in winter | Pet-safe |
| Prickly Crossandra | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; reduce to every 10–14 days in winter | Pet-safe |
| Prickly Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; monthly or less in winter | Toxic to pets |
| Prickly Heath Bell's Seedling | Bright indirect light (just back from a sunny window) | Regularly during the growing season; keep soil moist | Mildly toxic to pets |
| Prickly Juniper | Direct sun (at least 4-6 hours) | Water fortnightly when young; minimal irrigation once established | Mildly toxic to pets |
| Prickly Shield Fern | Medium indirect light (a couple of metres from a window) | Weekly; drought-tolerant once established | Pet-safe |
| Prickly Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks; minimal watering in winter | Mildly toxic to pets |
| Prima Donna Magic Flower | Bright indirect light (just back from a sunny window) | Every 3–5 days during active growth; withhold entirely during dormancy | Pet-safe |
| Primrose Huernia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Primrose-Flower Begonia | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of compost begins to dry, roughly every 5-8 days in growth | Toxic to pets |
| Primrose-leaf Streptocarpus | Medium indirect light (a couple of metres from a window) | every 5–8 days in the growing season, every 10–14 days in winter | Pet-safe |
| Primula farinosa | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth; water whenever the surface dries | Toxic to pets |
| Primula japonica | Bright indirect light (just back from a sunny window) | Keep wet at all times; never let the soil dry out | Toxic to pets |
| Primulina 'Loki' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Mildly toxic to pets |
| Prince Albert's Yew | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply during dry spells and avoid letting the rootball dry out | Mildly toxic to pets |
| Prince Masdevallia | Medium indirect light (a couple of metres from a window) | Daily to every 2 days; medium should remain evenly moist at all times | Pet-safe |
| Prince of Wales Juniper | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing, then minimal | Mildly toxic to pets |
| Prince's feather | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7 days in summer | Mildly toxic to pets |
| Profusion orange zinnia | Direct sun (at least 4-6 hours) | Every 5–7 days once established; more frequently in pots or extreme heat | Pet-safe |
| Prosperity Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season, more in heat | Pet-safe |
| Prostrate Blue Noble Fir | Direct sun (at least 4-6 hours) | Weekly when young, drought-tolerant once established | Mildly toxic to pets |
| Prostrate Speedwell | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Pet-safe |
| Prunus 'Accolade' | Direct sun (at least 4-6 hours) | Water deeply weekly for the first two seasons; established trees rely on rainfall | Toxic to pets |
| Prunus 'Kanzan' | Direct sun (at least 4-6 hours) | Water deeply weekly for the first two seasons; established trees rely on rainfall | Toxic to pets |
| Prunus 'Spire' | Direct sun (at least 4-6 hours) | Water regularly for the first 2-3 years; established trees need water only in prolonged dry spells | Toxic to pets |
| Prunus maackii | Direct sun (at least 4-6 hours) | Water young trees deeply every 7-14 days in dry weather for the first two seasons; established trees are fairly drought-tolerant | Toxic to pets |
| Prunus padus | Direct sun (at least 4-6 hours) | Water regularly while establishing; mature trees rarely need irrigation except in extended drought | Toxic to pets |
| Prunus serrula | Direct sun (at least 4-6 hours) | Keep soil evenly moist in the first 2-3 years; established trees need watering only in prolonged summer drought | Toxic to pets |
| Prunus subhirtella 'Autumnalis' | Direct sun (at least 4-6 hours) | Water regularly during establishment; mature trees need watering only in prolonged summer drought | Toxic to pets |
| Pseudolarix amabilis | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing; mature trees mostly rainfall-dependent but watered in drought | Mildly toxic to pets |
| Pseudolithos cubiformis | Bright indirect light (just back from a sunny window) | Very sparingly; only when fully dry and the body begins to soften, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| Pseudolithos migiurtinus | Bright indirect light (just back from a sunny window) | Very sparingly; only when fully dry, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| Puebla Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist 2–3 times weekly in dry conditions | Pet-safe |
| Pulasan | Direct sun (at least 4-6 hours) | Regular watering every 3-7 days; keep soil evenly moist | Mildly toxic to pets |
| Pulasan | Direct sun (at least 4-6 hours) | Every 3–5 days for young trees; every 7–10 days for established trees during dry periods | Mildly toxic to pets |
| Pumila Dwarf Pampas Grass | Direct sun (at least 4-6 hours) | Weekly during establishment; afterwards only in drought | Pet-safe |
| Pumila Norway Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing; deep soak when the top 5 cm of soil dries | Pet-safe |
| Punting-Pole Bamboo | Direct sun (at least 4-6 hours) | Once or twice per week during growing season; less frequent in winter | Pet-safe |
| Purging Jatropha | Direct sun (at least 4-6 hours) | Every 3–4 weeks in the growing season; none to once a month in winter dormancy | Toxic to pets |
| Purity cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; highly drought tolerant once established | Pet-safe |
| Purple Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist sparingly 1–2 times weekly | Pet-safe |
| Purple Bugle | Medium indirect light (a couple of metres from a window) | Moderate; consistent moisture preferred | Mildly toxic to pets |
| Purple Cliff Brake | Direct sun (at least 4-6 hours) | every 2-3 weeks | Mildly toxic to pets |
| Purple Coneflower | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; about weekly while establishing, then only in drought | Pet-safe |
| Purple Fingers | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through early spring; none in summer | Pet-safe |
| Purple Glory Tree | Direct sun (at least 4-6 hours) | Water regularly in spring and summer to keep soil consistently moist; reduce in cooler months. | Mildly toxic to pets |
| Purple Heart | Bright indirect light (just back from a sunny window) | When the top inch of soil dries out, roughly weekly in summer and every 2 weeks in winter | Toxic to pets |
| Purple Heart | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Purple Heartleaf Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days during active growth; minimal in winter | Pet-safe |
| Purple Jerusalem Sage | Direct sun (at least 4-6 hours) | Low — once every 2–3 weeks in the growing season; minimal in winter | Mildly toxic to pets |
| Purple Love Grass | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent during the first growing season | Pet-safe |
| Purple Milkweed | Direct sun (at least 4-6 hours) | Keep evenly moist; water during dry periods, especially while establishing | Toxic to pets |
| Purple Moor Grass | Bright indirect light (just back from a sunny window) | Regular; do not allow to dry out completely | Pet-safe |
| Purple mountain heather | Direct sun (at least 4-6 hours) | Regularly; maintain consistent moisture throughout the growing season | Mildly toxic to pets |
| Purple Mountain Saxifrage | Bright indirect light (just back from a sunny window) | Every 5–7 days during the growing season; maintain slight moisture at all times | Pet-safe |
| Purple Mullein | Direct sun (at least 4-6 hours) | Every 7–10 days during active growth and dry spells | Mildly toxic to pets |
| Purple Needlegrass | Direct sun (at least 4-6 hours) | Very low; summer-dry, winter-wet cycle | Pet-safe |
| Purple Paintbrush | Direct sun (at least 4-6 hours) | Rarely; dry to very dry conditions | Mildly toxic to pets |
| Purple Passion Plant | Bright indirect light (just back from a sunny window) | Every 7 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Purple Poppy Mallow | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; deeply drought-tolerant | Pet-safe |
| Purple Prairie Clover | Direct sun (at least 4-6 hours) | Water to establish; thereafter drought-tolerant, rarely needs watering | Mildly toxic to pets |
| Purple Prickly Pear | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and almost never in winter | Pet-safe |
| Purple Queen bougainvillea | Direct sun (at least 4-6 hours) | Every 7–14 days in active growth; withhold to 3–4 week intervals to trigger blooming | Mildly toxic to pets |
| Purple Rose Tree | Direct sun (at least 4-6 hours) | Every 1–2 weeks in autumn and winter (active growing season); reduce to monthly or suspend in summer dormancy | Mildly toxic to pets |
| Purple Seemannia | Bright indirect light (just back from a sunny window) | Every 4–5 days in growth; every 10–14 days in partial dormancy | Mildly toxic to pets |
| Purple Stelis | Medium indirect light (a couple of metres from a window) | Every 2–3 days in active growth; reduce slightly in cooler months | Pet-safe |
| Purple toadflax | Direct sun (at least 4-6 hours) | Rarely needed once established; water young plants weekly until established | Mildly toxic to pets |
| Purple Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more in active growth | Pet-safe |
| Purple Waffle Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil consistently moist | Pet-safe |
| Purple Wreath | Direct sun (at least 4-6 hours) | Every 5–7 days during the growing season; every 10–14 days in cooler months | Mildly toxic to pets |
| Purple-Top Germander | Bright indirect light (just back from a sunny window) | Weekly to fortnightly in summer; reduce in autumn and winter | Mildly toxic to pets |
| Purpurascens Flame Grass | Direct sun (at least 4-6 hours) | Weekly to establish, then mostly rainfall except in drought | Mildly toxic to pets |
| Purpus's Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks (growing season); monthly or less in winter | Toxic to pets |
| Pusillus Miniature Sweet Flag | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; water whenever the surface starts to dry, every 2-4 days in pots | Mildly toxic to pets |
| Pussy Ears Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days; allow the top half of the soil to dry out between waterings | Pet-safe |
| Pygmy Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in growing season, once per week in winter | Pet-safe |
| Pygmy Cactus | Bright indirect light (just back from a sunny window) | When soil is dry, about every 7-10 days in growth; keep dry in winter | Pet-safe |
| Pygmy Date Palm | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth; reduce in winter | Pet-safe |
| Pyracantha angustifolia | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, often daily in summer and every few days in cooler weather | Mildly toxic to pets |
| Pyramidal Bugle | Bright indirect light (just back from a sunny window) | Every 10–14 days; minimal irrigation once established | Mildly toxic to pets |
| Pyramidalis Arborvitae | Direct sun (at least 4-6 hours) | Two to three times weekly when establishing; weekly once rooted in | Mildly toxic to pets |
| Pyrenean Heron's Bill | Direct sun (at least 4-6 hours) | Water every 7-10 days in summer; minimal watering from autumn to spring | Mildly toxic to pets |
| Pyrenean Ramonda | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season; minimal in winter | Pet-safe |
| QIS Mix statice | Direct sun (at least 4-6 hours) | Every 7–10 days when actively growing; reduce in cool or wet weather | Pet-safe |
| Quaking Grass | Direct sun (at least 4-6 hours) | Water moderately; drought-tolerant once established | Mildly toxic to pets |
| Queen Anthurium | Bright indirect light (just back from a sunny window) | When the top of the medium approaches dryness (often every 5-7 days in growth; every 2-3 weeks in winter) | Toxic to pets |
| Queen Elizabeth Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly, when the top few centimetres of soil are dry | Pet-safe |
| Queen of Hearts Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14 days in winter | Toxic to pets |
| Queen of Sweden Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | Pet-safe |
| Queen of the Prairie | Bright indirect light (just back from a sunny window) | Frequently — keep soil consistently moist | Mildly toxic to pets |
| Queen Pineapple | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Queeny Lime Orange zinnia | Direct sun (at least 4-6 hours) | Every 3–5 days in warm weather; reduce in cool spells | Pet-safe |
| Quehlianum Chin Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Quercus coccinea | Direct sun (at least 4-6 hours) | Water young trees deeply every 10-14 days in dry weather through the first two seasons; established trees are drought-tolerant | Toxic to pets |
| Quercus robur 'Fastigiata' | Direct sun (at least 4-6 hours) | Water young trees deeply every 10-14 days in dry spells for the first two seasons; established oaks are very drought-tolerant | Toxic to pets |
| Quesnel's Bromeliad | Bright indirect light (just back from a sunny window) | Top up tank every 5–7 days; soil every 10–14 days | Pet-safe |
| Quila Bamboo | Medium indirect light (a couple of metres from a window) | Weekly to twice weekly during growing season; reduce in winter | Pet-safe |
| Rabiea albinota | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in active growth; keep nearly dry in winter | Mildly toxic to pets |
| Racine's Vriesea | Bright indirect light (just back from a sunny window) | Refresh cup every 7–10 days; medium every 2 weeks | Pet-safe |
| Radicalis Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 14–21 days in winter | Pet-safe |
| Rainbow Leucothoe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; do not allow to dry out | Toxic to pets |
| Rainforest Plum | Bright indirect light (just back from a sunny window) | Water 2–3 times per week in the growing season; once every 7–10 days in cooler months. | Pet-safe |
| Rambling Sundew | Bright indirect light (just back from a sunny window) | Tray method during winter growing season (June–November); completely dry summer dormancy (December–May in the southern hemisphere) | Mildly toxic to pets |
| Rambutan | Direct sun (at least 4-6 hours) | Regular watering every 3-7 days; keep soil evenly moist year-round | Mildly toxic to pets |
| Rangoon Creeper | Direct sun (at least 4-6 hours) | Regularly during active growth — roughly every 3–5 days; reduce in winter | Mildly toxic to pets |
| Rattlesnake Fern | Medium indirect light (a couple of metres from a window) | Moderate — consistently moist but never waterlogged | Mildly toxic to pets |
| Rattlesnake Master | Direct sun (at least 4-6 hours) | Water to establish, then rarely; highly drought-tolerant once rooted | Mildly toxic to pets |
| Rattlesnake plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is just dry, roughly every 5-7 days in summer and every 10-14 days in winter | Pet-safe |
| Rattlesnake Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Rauwolff's Eminium | Direct sun (at least 4-6 hours) | Moderate during spring growing season; bone dry in summer dormancy | Toxic to pets |
| Raven ZZ Plant | Low light (north window or shaded room) | Every 2–4 weeks in growing season; every 4–6 weeks in winter | Toxic to pets |
| Ravenea Glauca | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Ravenna Grass | Direct sun (at least 4-6 hours) | Weekly while establishing in year one, then only during prolonged drought | Mildly toxic to pets |
| Rayed Broom | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Toxic to pets |
| Rebutia krainziana | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in summer; none in winter | Mildly toxic to pets |
| Rechinger's Rosularia | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; very rarely in winter | Pet-safe |
| Red Aloe | Direct sun (at least 4-6 hours) | When soil is fully dry, every 1-2 weeks in warm growth | Toxic to pets |
| Red amaranth | Direct sun (at least 4-6 hours) | Every 7–10 days once established | Mildly toxic to pets |
| Red Arrow Arrowhead Vine | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; every 10–14 days in winter | Toxic to pets |
| Red Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil is dry, every 2-4 days in active growth | Pet-safe |
| Red Barrenwort | Medium indirect light (a couple of metres from a window) | Weekly during establishment; established plants need watering only during extended summer drought | Mildly toxic to pets |
| Red Campion | Medium indirect light (a couple of metres from a window) | Moderate; keep moist | Mildly toxic to pets |
| Red Clockvine | Direct sun (at least 4-6 hours) | Every 3–5 days during active growth; reduce in winter | Mildly toxic to pets |
| Red escallonia | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Mildly toxic to pets |
| Red Feather Clover | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Red Fescue | Bright indirect light (just back from a sunny window) | Infrequent — drought-tolerant once established | Pet-safe |
| Red Fir | Direct sun (at least 4-6 hours) | Regular moisture; does not tolerate summer drought well | Pet-safe |
| Red Ginger | Bright indirect light (just back from a sunny window) | Every 3–5 days in the growing season; reduce in cooler months | Pet-safe |
| Red Groove Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| red head fountain grass | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; reduce in autumn; minimal in winter | Pet-safe |
| Red Horned Poppy | Direct sun (at least 4-6 hours) | Rarely; only during prolonged drought | Toxic to pets |
| Red Inca Passionflower | Direct sun (at least 4-6 hours) | Every 3–5 days; keep consistently moist but not waterlogged | Pet-safe |
| Red Iochroma | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth, every 10-14 days in winter | Toxic to pets |
| Red Latan Palm | Direct sun (at least 4-6 hours) | Every 7–14 days; allow soil to partially dry between waterings | Pet-safe |
| Red Margin Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during establishment; weekly once mature | Pet-safe |
| Red Mombin | Direct sun (at least 4-6 hours) | Every 10–21 days; drought-tolerant when established | Pet-safe |
| Red morning glory | Direct sun (at least 4-6 hours) | Once or twice a week; drought-tolerant when established | Toxic to pets |
| Red Nerve Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil evenly moist | Pet-safe |
| Red Osier Dogwood | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | Pet-safe |
| Red Pagoda | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Toxic to pets |
| Red Polka Dot Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days; slightly less in winter | Pet-safe |
| Red Ray Switchgrass | Direct sun (at least 4-6 hours) | Every 1-2 weeks when established | Pet-safe |
| Red Riding Hood Mandevilla | Direct sun (at least 4-6 hours) | Every 2-3 days in summer when actively blooming, reduce to every 10-14 days in winter | Mildly toxic to pets |
| Red Rooster Sedge | Direct sun (at least 4-6 hours) | Keep evenly moist; water once or twice weekly in heat, less in cool weather | Mildly toxic to pets |
| Red Sentinel Astilbe | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water every 3-5 days in summer, more in heat or containers | Pet-safe |
| Red Sheep Laurel | Bright indirect light (just back from a sunny window) | Moderate; keep moist | Toxic to pets |
| Red Silk Cotton Tree | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; every 3–5 weeks in winter | Mildly toxic to pets |
| Red Spruce | Direct sun (at least 4-6 hours) | Weekly in dry periods; naturally receives adequate moisture in humid northeastern climates | Pet-safe |
| Red Star Cluster | Direct sun (at least 4-6 hours) | Every 5–7 days; allow top 2–3 cm of soil to dry | Pet-safe |
| Red Stem Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Red Twig Dogwood 'Arctic Fire' | Direct sun (at least 4-6 hours) | Keep consistently moist; tolerates wet soil | Pet-safe |
| Red Valerian | Direct sun (at least 4-6 hours) | Drought-tolerant; water only to establish and in extended dry spells | Mildly toxic to pets |
| Red Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more frequent in first season | Pet-safe |
| Red-bristled Dragon Orchid | Medium indirect light (a couple of metres from a window) | Every 2–3 days; roots must not dry out | Pet-safe |
| Red-fingered Vriesea | Bright indirect light (just back from a sunny window) | Refill cup every 7 days; flush every 3–4 weeks | Pet-safe |
| Red-fleshed Durian | Direct sun (at least 4-6 hours) | Daily watering in dry periods; 3–4 times per week when humidity is high | Pet-safe |
| Red-Leaved Spiral Ginger | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water when the top 1–2 cm of soil begins to feel dry. | Mildly toxic to pets |
| Red-petal Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting or watering every 1-2 days; never allow to dry | Pet-safe |
| Red-stemmed Sensitive Fern | Medium indirect light (a couple of metres from a window) | Keep soil continuously moist to wet; water every 2–3 days or more in dry spells | Mildly toxic to pets |
| Red-Topped Sage | Direct sun (at least 4-6 hours) | Water when the top 3 cm of soil feels dry | Pet-safe |
| Reddish Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to dry out fully) | Pet-safe |
| Redvein enkianthus | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduce to every 2–3 weeks in winter | Mildly toxic to pets |
| Redvein Enkianthus Red Bells | Bright indirect light (just back from a sunny window) | Regularly during the growing season; reduce in winter | Mildly toxic to pets |
| Regel's Nidularium | Medium indirect light (a couple of metres from a window) | Weekly cup refill; medium barely moist | Pet-safe |
| Regel's Sage | Direct sun (at least 4-6 hours) | Moderate; approximately 2.5 cm (1 inch) per week | Pet-safe |
| Reichenbach's Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist 2–3 times weekly | Pet-safe |
| Reichenbach's Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in warm weather; every 2–3 days in cooler months | Pet-safe |
| Reinwardtii Haworthia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Related Columnea | Medium indirect light (a couple of metres from a window) | When top 2–3 cm of mix dries | Pet-safe |
| Renny Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Repandens Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, roughly weekly while establishing | Toxic to pets |
| Restrepia antennifera | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water every 2-3 days so the medium never dries out fully | Pet-safe |
| Restrepia elegans | Medium indirect light (a couple of metres from a window) | Keep the medium consistently moist; water every 2-3 days, never allowing it to dry out | Pet-safe |
| Restrepia guttulata | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water every 2-3 days, never letting the medium dry out | Pet-safe |
| Restrepo's Chigua | Medium indirect light (a couple of metres from a window) | Every 7–10 days; ensure consistent moisture without waterlogging | Toxic to pets |
| Resurrection fern | Medium indirect light (a couple of metres from a window) | Mist or moisten every 2-4 days; let it dry between | Mildly toxic to pets |
| Resurrection Gesneriad | Medium indirect light (a couple of metres from a window) | Once a week in the growing season; sparingly in winter | Pet-safe |
| Reticulate Pseuderanthemum | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; reduce to every 10–14 days in winter | Mildly toxic to pets |
| Revolute Tromotriche | Direct sun (at least 4-6 hours) | Every 3–4 weeks in the growing season; minimal to none in dormancy | Mildly toxic to pets |
| Rhaphidophora Decursiva | Bright indirect light (just back from a sunny window) | Roughly weekly to fortnightly, when top 2-3 inches of soil are dry | Toxic to pets |
| Rheingold Arborvitae | Direct sun (at least 4-6 hours) | Twice weekly while establishing; weekly thereafter | Mildly toxic to pets |
| Rhinephyllum broomii | Direct sun (at least 4-6 hours) | Only once the soil is completely dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Rhipsalis 'Cashero' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| Rhododendron 'Catawbiense Boursault' | Bright indirect light (just back from a sunny window) | Keep the rootball consistently moist; water deeply 1-2 times weekly in dry spells | Toxic to pets |
| Rhododendron 'Cunningham's White' | Bright indirect light (just back from a sunny window) | Keep consistently moist; water deeply 1-2 times weekly during dry spells | Toxic to pets |
| Rhododendron 'PJM' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply 1-2 times weekly in dry spells, more in heat | Toxic to pets |
| Rhombus-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in winter | Pet-safe |
| Ribbon Bush | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; reduce to every 14 days in winter rest | Pet-safe |
| Ribbon Grass | Bright indirect light (just back from a sunny window) | Adaptable; keep moist for best foliage but tolerates dry once established | Mildly toxic to pets |
| Riberry | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 10–14 days for mature plants in mild conditions | Pet-safe |
| Ric Rac Cactus | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of compost is dry, roughly every 7-10 days in summer | Pet-safe |
| Ridley's Hohenbergia | Bright indirect light (just back from a sunny window) | Tank weekly; soil every 10–14 days | Pet-safe |
| Ridley's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Rigid Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; almost none in winter | Pet-safe |
| Rigid Goldenrod | Direct sun (at least 4-6 hours) | Low — drought tolerant once established | Pet-safe |
| Ring Fern | Bright indirect light (just back from a sunny window) | Water when the top 3–5 cm of soil is dry — more drought-tolerant than most ferns once established | Mildly toxic to pets |
| Rio Jaboticaba | Direct sun (at least 4-6 hours) | Every 2–3 days when young; deeply once or twice per week when established | Mildly toxic to pets |
| Rise 'n' Shine Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, around every 2-4 days in summer | Pet-safe |
| river clog plant | Bright indirect light (just back from a sunny window) | Every 6–9 days in spring–summer, every 10–14 days in winter | Pet-safe |
| Robert Chapman heather | Direct sun (at least 4-6 hours) | Regular watering for the first season; drought-tolerant once established | Pet-safe |
| Robin Hill serviceberry | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Robinia pseudoacacia 'Frisia' | Direct sun (at least 4-6 hours) | Water weekly while establishing, then rely on rainfall | Toxic to pets |
| Rochford's Holly Fern | Low light (north window or shaded room) | Every 7–10 days; less in winter | Pet-safe |
| Rock Candytuft | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Pet-safe |
| Rock Cress | Direct sun (at least 4-6 hours) | Low; water only when soil has dried out, roughly every 10–14 days in summer | Pet-safe |
| Rock Daffodil | Direct sun (at least 4-6 hours) | Minimal; moderate during active growth, completely dry in summer | Toxic to pets |
| Rock Liveforever | Direct sun (at least 4-6 hours) | Every 3–5 weeks in summer (near-dry dormancy), every 2–3 weeks in winter (active season) | Pet-safe |
| Rock Polypody | Medium indirect light (a couple of metres from a window) | Low to moderate — allow to dry slightly between waterings | Pet-safe |
| Rock Speedwell | Bright indirect light (just back from a sunny window) | Once every 7–10 days during the growing season; reduce markedly in winter. | Pet-safe |
| Rocket candytuft | Direct sun (at least 4-6 hours) | Every 7–14 days; keep moist during establishment, reduce once rooted | Pet-safe |
| Rocket Mixed snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; maintain consistent soil moisture | Pet-safe |
| Rocky Mountain Bristlecone Pine | Direct sun (at least 4-6 hours) | Deep watering every 2-3 weeks once established; let dry between | Mildly toxic to pets |
| Rocky Mountain Douglas Fir | Direct sun (at least 4-6 hours) | Moderate during establishment; drought-tolerant once established | Pet-safe |
| Rocky Mountain penstemon | Direct sun (at least 4-6 hours) | Every 14–21 days once established; very drought-tolerant | Mildly toxic to pets |
| Rocky Mountain Woodsia | Medium indirect light (a couple of metres from a window) | Water when the top 2–3 cm of medium feel dry | Pet-safe |
| Rodriguezia lanceolata | Bright indirect light (just back from a sunny window) | Water as roots approach dryness, roughly every 2-4 days on a mount, less in pots | Mildly toxic to pets |
| Rodriguezia secunda | Bright indirect light (just back from a sunny window) | Every 2-4 days when mounted; every 4-6 days in a small basket, keeping it lightly moist | Mildly toxic to pets |
| Roesl's Uncarina | Direct sun (at least 4-6 hours) | Every 10–14 days in active growth; none or minimal October–March | Mildly toxic to pets |
| Rolfe's Masdevallia | Medium indirect light (a couple of metres from a window) | Every 1–2 days in summer; every 2–3 days in winter | Pet-safe |
| Roller Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; minimal in winter | Pet-safe |
| Rollers Houseleek | Direct sun (at least 4-6 hours) | Every 14-21 days in spring and summer; barely at all in winter | Pet-safe |
| Rolling Houseleek | Direct sun (at least 4-6 hours) | Low — extremely drought-tolerant | Mildly toxic to pets |
| Roosevelt Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days in the growing season, less in winter | Pet-safe |
| Rose Apple | Direct sun (at least 4-6 hours) | Deep watering every 5-7 days in growth; more often in fruiting and heat | Mildly toxic to pets |
| Rose campion | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Rose of Sharon | Direct sun (at least 4-6 hours) | Weekly during dry spells; drought-tolerant once established | Mildly toxic to pets |
| Rose of Sharon 'Blue Bird' | Direct sun (at least 4-6 hours) | Weekly while establishing, then during dry or hot spells | Pet-safe |
| Rose of Sharon 'Diana' | Direct sun (at least 4-6 hours) | Weekly to establish, then during dry and hot periods | Pet-safe |
| Rose Pincushion Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in spring and summer; little to none in winter | Pet-safe |
| Rose Queen Barrenwort | Medium indirect light (a couple of metres from a window) | Water weekly until established; thereafter drought-tolerant, needing only occasional watering during prolonged dry spells | Mildly toxic to pets |
| Rosebay Willowherb | Direct sun (at least 4-6 hours) | Minimal once established; tolerates both dry and wet soils | Pet-safe |
| Roseraie de l'Hay Rose | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once settled | Pet-safe |
| Rosinweed | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Rossica Major rowan | Direct sun (at least 4-6 hours) | Regular during establishment; self-sufficient once mature | Mildly toxic to pets |
| Rosy-Leaf Sage | Bright indirect light (just back from a sunny window) | Twice weekly in summer; weekly or less in cooler months | Mildly toxic to pets |
| Roth's Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times a week; soak 10–20 minutes weekly if conditions are dry | Pet-safe |
| Rotstrahlbusch Switch Grass | Direct sun (at least 4-6 hours) | Water weekly the first season; once established, only during prolonged drought | Mildly toxic to pets |
| Rough Blazing Star | Direct sun (at least 4-6 hours) | Water to establish, then only during extended drought | Pet-safe |
| Rough Coelogyne | Bright indirect light (just back from a sunny window) | Every 3–5 days in active growth; reduce slightly in winter | Pet-safe |
| Rough Columnea | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; every 10–14 days in winter | Pet-safe |
| Rough Coneflower | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Rough Hawk's-beard | Direct sun (at least 4-6 hours) | Low — drought-tolerant, especially in the rosette year | Pet-safe |
| Rough Hawkbit | Direct sun (at least 4-6 hours) | Low — requires water only during prolonged summer drought | Pet-safe |
| Rough Pellionia | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; reduce to every 10–14 days in winter | Pet-safe |
| Rough Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Mildly toxic to pets |
| Rough-leaved Cape Mallow | Direct sun (at least 4-6 hours) | Water when the top 3–4 cm of soil is dry | Mildly toxic to pets |
| Round-Leaf Calathea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 10–14 days in winter | Pet-safe |
| Round-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow top 2–3 cm to dry) | Pet-safe |
| Round-leaf Rosularia | Direct sun (at least 4-6 hours) | Every 14–21 days during spring and summer; minimal in winter | Pet-safe |
| Round-lobed Hepatica | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; minimal in summer dormancy | Mildly toxic to pets |
| Rounded Sweetgum | Direct sun (at least 4-6 hours) | Weekly during establishment; less once mature | Mildly toxic to pets |
| Roundhead Prairie Clover | Direct sun (at least 4-6 hours) | Once established, water deeply every 2–3 weeks in summer; no supplemental water needed once the taproot is mature | Pet-safe |
| Rowallane quince | Bright indirect light (just back from a sunny window) | Weekly when establishing; every 2–3 weeks during dry spells once established | Mildly toxic to pets |
| Rowlee's Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days in summer; every 2–4 days in cooler months | Pet-safe |
| Royal Blue Aubrieta | Direct sun (at least 4-6 hours) | Weekly in spring and autumn; infrequently in summer | Pet-safe |
| Royal Purple Lilyturf | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Royal Star Magnolia | Direct sun (at least 4-6 hours) | Weekly while young; in summer droughts for established shrubs | Pet-safe |
| Royal Trumpet Vine | Direct sun (at least 4-6 hours) | Twice weekly in summer; weekly in cooler months | Mildly toxic to pets |
| Rubenza cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; drought tolerant once established | Pet-safe |
| Rubrum Epimedium | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 1-2 weeks | Mildly toxic to pets |
| Ruby Cascade Peperomia | Bright indirect light (just back from a sunny window) | Roughly every 10-14 days; let the top 2-3 cm dry out first | Pet-safe |
| Ruby Glow Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in spring/summer; every 4–6 weeks in winter | Pet-safe |
| Ruby Necklace | Bright indirect light (just back from a sunny window) | Roughly every 1-3 weeks; let the soil dry out completely between waterings | Mildly toxic to pets |
| Ruby Ribbons Switch Grass | Direct sun (at least 4-6 hours) | Weekly during establishment; afterwards only in drought | Mildly toxic to pets |
| Rudbeckia 'Goldsturm' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly weekly in summer, more in prolonged heat | Mildly toxic to pets |
| Rudbeckia maxima | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Mildly toxic to pets |
| Ruellia Brittoniana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-10 days; very drought-tolerant once established | Mildly toxic to pets |
| Ruffled Echeveria | Bright indirect light (just back from a sunny window) | When the soil dries fully, roughly every 10-14 days in growth | Pet-safe |
| Rugosa Rose | Direct sun (at least 4-6 hours) | weekly when establishing, monthly once established | Pet-safe |
| Running Tapestry Foamflower | Medium indirect light (a couple of metres from a window) | Every 5–7 days; more during summer drought | Pet-safe |
| Running Tapestry Tiarella | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply once or twice weekly in dry spells | Mildly toxic to pets |
| Ruschia lineolata | Direct sun (at least 4-6 hours) | When the soil has fully dried, roughly every 10-14 days in growth | Mildly toxic to pets |
| Ruschia uncinata | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth | Mildly toxic to pets |
| Russian Arborvitae | Bright indirect light (just back from a sunny window) | Water weekly until established; drought-tolerant once mature | Mildly toxic to pets |
| Russian Olive | Direct sun (at least 4-6 hours) | Low; highly drought-tolerant | Pet-safe |
| Rustica Rubra magnolia | Direct sun (at least 4-6 hours) | Regularly when young; moderate once established | Pet-safe |
| Rusty Foxglove | Direct sun (at least 4-6 hours) | When the top few cm of soil are dry; established plants are fairly drought-tolerant | Toxic to pets |
| Rusty Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in spring and summer; every 2–3 weeks in autumn and winter | Pet-safe |
| Rustyback Fern | Bright indirect light (just back from a sunny window) | Infrequently; allow to dry between waterings | Pet-safe |
| Rutenberg's Pachypodium | Direct sun (at least 4-6 hours) | Every 7–14 days in summer; once monthly or less in winter | Toxic to pets |
| Ryegrass Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week or soak for 20 minutes weekly | Pet-safe |
| Rzedowski's Dioon | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer; once a month or less in winter | Toxic to pets |
| Sabal Bermudana | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Sabal Mexicana | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Sabin's Strobilanthes | Medium indirect light (a couple of metres from a window) | 2–3 times weekly in summer; reduce to once weekly in winter | Mildly toxic to pets |
| Sabre-Leaved Hottentot Fig | Direct sun (at least 4-6 hours) | very low — water only when soil is dry | Mildly toxic to pets |
| Sacred Buddhist | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (or as soon as the soil surface begins to dry); less frequently in winter | Toxic to pets |
| Sad Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup every 5–7 days; soil every 2–3 weeks | Pet-safe |
| Saddle Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep medium evenly moist; water every 2–3 days | Mildly toxic to pets |
| Saffron Pepper | Bright indirect light (just back from a sunny window) | Every 5–8 days; allow top 2–3 cm of soil to dry | Mildly toxic to pets |
| Sagae Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Sage-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Deeply but infrequently once established; every 2–3 weeks in the first two summers, then rainfall alone suffices in most UK/mild US climates. | Mildly toxic to pets |
| Sago palm | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Sago Palm 'Aurea' | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days | Toxic to pets |
| Saguaro Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 2-3 weeks in summer; none in winter | Mildly toxic to pets |
| Sahuc's Sun Rose Hybrid | Direct sun (at least 4-6 hours) | Infrequent once established | Mildly toxic to pets |
| Salak | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water every 2-4 days in warm weather | Mildly toxic to pets |
| Salal | Low light (north window or shaded room) | Moderate; established plants are drought-tolerant but prefer moist conditions | Pet-safe |
| Sally-My-Handsome | Direct sun (at least 4-6 hours) | Every 3–4 weeks in the growing season; minimal in winter | Mildly toxic to pets |
| Salmon Queen scabiosa | Direct sun (at least 4-6 hours) | Every 5–7 days in active growth; reduce in cool spells | Pet-safe |
| Salvia 'Hot Lips' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly while establishing, then infrequently | Pet-safe |
| Salvia 'May Night' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; roughly weekly, less once established | Pet-safe |
| Salvia × sylvestris 'Blauhügel' | Direct sun (at least 4-6 hours) | When top 3-5 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| Salvia nemorosa 'Ostfriesland' | Direct sun (at least 4-6 hours) | When top 3-5 cm of soil is dry, about every 7-10 days once established | Pet-safe |
| Salvia splendens 'Sizzler Burgundy' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Mildly toxic to pets |
| Salvia splendens 'Vista Red' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer heat | Pet-safe |
| Salvia verticillata 'Purple Rain' | Direct sun (at least 4-6 hours) | When top 3-5 cm of soil is dry, about every 7-10 days once established | Pet-safe |
| Salvia yangii | Direct sun (at least 4-6 hours) | When top 5 cm of soil is dry, roughly every 10-14 days once established | Mildly toxic to pets |
| Samaipatensis Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer; sparing in winter | Pet-safe |
| San Diego Red Bougainvillea | Direct sun (at least 4-6 hours) | Every 7–14 days when established; more frequently for container plants in hot weather | Mildly toxic to pets |
| San Diego Sage | Direct sun (at least 4-6 hours) | Low; drought tolerant once established | Pet-safe |
| San Gabriel Mountains Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks autumn through spring; none or minimal in summer | Pet-safe |
| San Jose Hesper Palm | Direct sun (at least 4-6 hours) | Every 2–3 weeks during growth; monthly or less when established | Pet-safe |
| Sand Bluestem | Direct sun (at least 4-6 hours) | Minimal — seasonal rainfall only in most settings | Pet-safe |
| Sand Crocus | Direct sun (at least 4-6 hours) | Water sparingly; keep dry in summer | Toxic to pets |
| Sand Everlasting | Direct sun (at least 4-6 hours) | Every 2–4 weeks; minimal in winter | Mildly toxic to pets |
| Sand Phlox | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; drought-tolerant | Pet-safe |
| Sand Pink | Direct sun (at least 4-6 hours) | Low; water only when soil is completely dry, roughly every 2–3 weeks in the growing season | Mildly toxic to pets |
| Sand Sedge | Direct sun (at least 4-6 hours) | Very infrequent — drought-adapted | Pet-safe |
| Sander's Maxillaria | Bright indirect light (just back from a sunny window) | Every 4–6 days year-round; never allow to fully dry out | Pet-safe |
| Sander's Vanda | Direct sun (at least 4-6 hours) | Daily in warmth; every 2-3 days when cool and dim | Pet-safe |
| Sandpaper verbena | Direct sun (at least 4-6 hours) | Every 5–7 days once established; more frequently in extreme heat | Mildly toxic to pets |
| Sandstone Cycad | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in active growth; monthly in winter | Toxic to pets |
| Sandy Sulcorebutia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; very sparingly or not at all in winter | Pet-safe |
| Sanguine Coneflower | Direct sun (at least 4-6 hours) | Weekly during first season; every 3–4 weeks once established | Pet-safe |
| Sanguisorba 'Tanna' | Direct sun (at least 4-6 hours) | Keep soil moist but not waterlogged; water every 4-7 days in dry weather | Pet-safe |
| Sanguisorba canadensis | Direct sun (at least 4-6 hours) | Keep consistently moist; water 2-3 times weekly in dry spells | Mildly toxic to pets |
| Sanguisorba obtusa | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply once or twice a week in dry spells | Mildly toxic to pets |
| Sanguisorba officinalis | Direct sun (at least 4-6 hours) | Keep soil moist; water every 4-7 days in dry spells | Pet-safe |
| Sansevieria Ballyi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Bantel's Sensation | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Black Coral | Low light (north window or shaded room) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Canaliculata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, every 2-4 weeks (less in winter) | Toxic to pets |
| Sansevieria Concinna | Bright indirect light (just back from a sunny window) | When the soil is fully dry, every 2-3 weeks (less in winter) | Toxic to pets |
| Sansevieria Ehrenbergii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Ehrenbergii Samurai | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Eilensis | Bright indirect light (just back from a sunny window) | When the soil is bone dry, roughly every 3-4 weeks | Toxic to pets |
| Sansevieria Fischeri | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Forskaliana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, every 2-4 weeks (less in winter) | Toxic to pets |
| Sansevieria Futura Superba | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Gracilis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Hahnii | Low light (north window or shaded room) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Hargeisana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, every 2-4 weeks (less in winter) | Toxic to pets |
| Sansevieria Hyacinthoides | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Intermedia | Medium indirect light (a couple of metres from a window) | When the soil is completely dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Kirkii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Laurentii | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Sansevieria Liberica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Longiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Masoniana Variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Moonshine | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Sansevieria Nilotica | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Parva | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days in summer | Toxic to pets |
| Sansevieria Patens | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Pearsonii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Phillipsiae | Bright indirect light (just back from a sunny window) | When the soil is completely dry, about every 3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Pinguicula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Powellii | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Raffillii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Robusta | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Senegambica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Singularis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Starfish | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Stuckyi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Subspicata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Black Gold | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks (less in winter) | Toxic to pets |
| Sansevieria Trifasciata Cleopatra | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Craigii | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Futura Robusta | Low light (north window or shaded room) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Trifasciata Gold Flame | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Golden Hahnii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Trifasciata Jade Marginata | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Laurentii Superba | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Night Owl | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Robusta | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, every 2-4 weeks (less in winter) | Toxic to pets |
| Sansevieria Trifasciata Sensation | Medium indirect light (a couple of metres from a window) | When soil is fully dry, roughly every 2-3 weeks (less in winter) | Toxic to pets |
| Sansevieria Trifasciata Silver Hahnii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Trifasciata Superba | Medium indirect light (a couple of metres from a window) | When soil is fully dry, roughly every 2-3 weeks (less in winter) | Toxic to pets |
| Sansevieria Trifasciata Twist | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Whitney | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Santa Rita Prickly Pear | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; once every 4-6 weeks in autumn; once monthly or less in winter | Mildly toxic to pets |
| Santa Rita Prickly Pear | Direct sun (at least 4-6 hours) | Sparingly when soil is fully dry, about every 3-4 weeks in summer; nearly none in winter | Pet-safe |
| Santol | Direct sun (at least 4-6 hours) | 2–3 times per week when establishing; established trees tolerate short dry spells | Mildly toxic to pets |
| Sanvitalia procumbens 'Mandarin Orange' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer containers | Pet-safe |
| Sanvitalia procumbens 'Sunvy Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer containers | Pet-safe |
| Sapodilla | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-10 days in growth | Mildly toxic to pets |
| Sapphire Blue Oat Grass | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing, then occasionally | Mildly toxic to pets |
| Sapphire Tower | Direct sun (at least 4-6 hours) | every 7–10 days in the growing season, every 21–28 days in winter | Pet-safe |
| Sarcochilus ceciliae | Bright indirect light (just back from a sunny window) | Water every 2-4 days in growth, allowing the medium to approach dryness between waterings | Pet-safe |
| Sarcochilus falcatus | Bright indirect light (just back from a sunny window) | Water every 2-3 days, keeping the roots moist but well aired | Pet-safe |
| Sarcochilus hartmannii | Bright indirect light (just back from a sunny window) | Water every 2-4 days, keeping the medium damp but never waterlogged | Pet-safe |
| Sarcococca confusa | Low light (north window or shaded room) | Water regularly to establish; afterwards every 7-14 days during dry spells | Mildly toxic to pets |
| Sarcococca Humilis | Low light (north window or shaded room) | Water regularly to establish; thereafter every 7-14 days in prolonged dry spells | Mildly toxic to pets |
| Sargent Cherry Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil starts to dry, often daily in summer | Toxic to pets |
| Sargent's quince | Bright indirect light (just back from a sunny window) | Weekly when establishing; drought-tolerant once established | Mildly toxic to pets |
| Satellit Bosnian Pine | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Satinleaf | Direct sun (at least 4-6 hours) | Weekly during establishment; every 10–14 days once established; drought-tolerant when mature | Mildly toxic to pets |
| Satomi Dogwood | Bright indirect light (just back from a sunny window) | Weekly during the growing season; every 2 weeks once fully established | Mildly toxic to pets |
| Saucer Magnolia | Direct sun (at least 4-6 hours) | Weekly while establishing, then during dry spells | Pet-safe |
| Saucer Magnolia | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 10–14 days once mature in dry spells | Pet-safe |
| Saucer Plant | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Saunders' Vriesea | Bright indirect light (just back from a sunny window) | Keep cup filled; medium dry-down every 2–3 weeks | Pet-safe |
| Savanna Gardenia | Direct sun (at least 4-6 hours) | Every 10–14 days during the growing season; every 21–28 days in dry season | Mildly toxic to pets |
| Savin Juniper | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; weekly during the first growing season | Toxic to pets |
| Saw-wort | Bright indirect light (just back from a sunny window) | Low once established | Mildly toxic to pets |
| Sawtooth Sunflower | Direct sun (at least 4-6 hours) | Weekly when young; every 1-2 weeks when established | Pet-safe |
| Scabiosa columbaria 'Butterfly Blue' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries; about weekly in the growing season | Pet-safe |
| Scabrosa Rugosa Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant afterwards | Pet-safe |
| Scaevola aemula 'Bombay Dark Blue' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm is dry, roughly every 3-5 days | Mildly toxic to pets |
| Scaevola aemula 'Whirlwind White' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm dries; baskets often need it every 1-3 days | Mildly toxic to pets |
| Scaly Blazing Star | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought | Pet-safe |
| Scaly Male Fern | Low light (north window or shaded room) | Keep soil moist; water in dry spells, especially while establishing | Mildly toxic to pets |
| Scaly-stem Columnea | Bright indirect light (just back from a sunny window) | Every 5–8 days in summer, every 10–14 days in winter | Pet-safe |
| Scaly-Stemmed Holly Fern | Low light (north window or shaded room) | Every 5–8 days in growing season, every 10–14 days in winter | Pet-safe |
| Scarlet Ball Cactus | Direct sun (at least 4-6 hours) | When the mix is dry, about every 10-14 days in growth; sparingly in winter | Pet-safe |
| Scarlet Bee Balm | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; often twice weekly in summer heat | Mildly toxic to pets |
| Scarlet Bidi-Bidi | Direct sun (at least 4-6 hours) | Fortnightly once established; drought-tolerant | Pet-safe |
| Scarlet bugler | Direct sun (at least 4-6 hours) | Every 10–14 days once established; minimal supplemental water needed | Mildly toxic to pets |
| Scarlet Cleistocactus | Bright indirect light (just back from a sunny window) | When the soil is dry, about every 7-10 days in summer; sparing in winter | Pet-safe |
| Scarlet Drymonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter. | Pet-safe |
| Scarlet Freesia | Direct sun (at least 4-6 hours) | Low to moderate during active growth; dry during summer dormancy | Pet-safe |
| Scarlet Giant Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days until established; every 14 days or less once established | Pet-safe |
| Scarlet Martagon Lily | Direct sun (at least 4-6 hours) | Moderate — water when top 5 cm of soil is dry | Toxic to pets |
| Scarlet Maxillaria | Bright indirect light (just back from a sunny window) | Every 2–3 days in growth, reduce slightly in winter | Pet-safe |
| Scarlet Sage | Direct sun (at least 4-6 hours) | Every 3–5 days; keep evenly moist | Mildly toxic to pets |
| Scarlet Star Bromeliad | Medium indirect light (a couple of metres from a window) | Fill the central urn weekly; water the potting mix every 2–3 weeks, allowing it to approach dryness between applications | Pet-safe |
| Scarletta Leucothoe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; do not allow soil to dry | Toxic to pets |
| Schaefer's Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in autumn–spring growing season; once per month or less in summer | Toxic to pets |
| Scharff's Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days, allowing the top 2–3 cm to dry between waterings | Toxic to pets |
| Schefflera | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Schiede's goldfish plant | Medium indirect light (a couple of metres from a window) | Water when the top 2 cm of soil dries out — approximately every 7–10 days in summer, every 10–14 days in winter. | Pet-safe |
| Schlumbergera 'White Christmas' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Schwantesia pillansii | Direct sun (at least 4-6 hours) | Only when soil is completely dry, roughly every 12-16 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Sciadopitys 'Ossorio Gold' | Bright indirect light (just back from a sunny window) | Keep evenly moist; deep weekly watering while establishing, more during heat or drought | Mildly toxic to pets |
| Scindapsus aureus | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Scots Pine | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil begins to dry, every few days in summer | Mildly toxic to pets |
| Scrub Palmetto | Direct sun (at least 4-6 hours) | Rarely after establishment — every 3–6 weeks in extended dry spells | Pet-safe |
| Scurfy Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; once every 2–3 weeks during summer dry rest | Pet-safe |
| Sea Apple | Direct sun (at least 4-6 hours) | Every 10–14 days for established trees; weekly for young or containerised plants | Mildly toxic to pets |
| Sea Campion | Direct sun (at least 4-6 hours) | Every 1–2 weeks; drought-tolerant once established | Pet-safe |
| Sea Heath | Direct sun (at least 4-6 hours) | Very low; drought-tolerant once established | Mildly toxic to pets |
| Sea Holly | Direct sun (at least 4-6 hours) | Water occasionally while establishing, then rarely once mature | Mildly toxic to pets |
| Sea Knotgrass | Direct sun (at least 4-6 hours) | Very low; exceptionally drought-tolerant | Mildly toxic to pets |
| Sea Lettuce | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in winter (active growth); monthly or less in summer (dormancy) | Pet-safe |
| Sea Mouse-ear | Direct sun (at least 4-6 hours) | Minimal; rely on rainfall in outdoor settings | Mildly toxic to pets |
| Sea Pea | Direct sun (at least 4-6 hours) | Infrequently; allow soil to dry between waterings | Toxic to pets |
| Sea Purslane Sun Rose | Direct sun (at least 4-6 hours) | Very low — drought-tolerant once established; water sparingly in the first year only | Mildly toxic to pets |
| Sea Sandwort | Direct sun (at least 4-6 hours) | Infrequently — allow soil to dry between waterings | Pet-safe |
| Sea Spurge | Direct sun (at least 4-6 hours) | Sparingly — very drought-tolerant | Toxic to pets |
| Sea Thrift | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Pet-safe |
| Sea Urchin Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly weekly to fortnightly in summer; keep nearly dry in winter | Pet-safe |
| Seabeach Sandwort | Direct sun (at least 4-6 hours) | Infrequently — highly drought-tolerant once established | Pet-safe |
| Sedum | Direct sun (at least 4-6 hours) | When the soil is dry, every 10-14 days for potted plants | Pet-safe |
| Sedum 'Autumn Joy' | Direct sun (at least 4-6 hours) | When soil is dry several centimeters down, roughly every 10-14 days | Pet-safe |
| Sedum 'Matrona' | Direct sun (at least 4-6 hours) | When soil is dry a few centimeters down, roughly every 10-14 days | Pet-safe |
| Sedum clavatum | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer | Pet-safe |
| Sedum hernandezii | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, very sparingly in winter | Pet-safe |
| Sedum palmeri | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Sedum spectabile 'Iceberg' | Direct sun (at least 4-6 hours) | When soil is dry a few centimeters down, about every 10-14 days | Pet-safe |
| Sedum telephium 'Purple Emperor' | Direct sun (at least 4-6 hours) | When soil is dry a few centimeters down, about every 10-14 days | Pet-safe |
| Sedum-leaf Medinilla | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to nearly dry between waterings) | Mildly toxic to pets |
| Sekete's Restrepia | Bright indirect light (just back from a sunny window) | Every 2-4 days; keep evenly moist | Pet-safe |
| Sempervivum 'Black' | Direct sun (at least 4-6 hours) | When soil is fully dry, every 10-14 days in growth; very little in winter | Pet-safe |
| Sempervivum 'Commander Hay' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum 'Emerald Empress' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer, far less if grown outdoors in the ground | Pet-safe |
| Sempervivum 'Killer' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; almost none in winter | Pet-safe |
| Sempervivum 'Oddity' | Direct sun (at least 4-6 hours) | When the soil is fully dry, sparingly; roughly every 2 weeks in summer and minimal in winter | Pet-safe |
| Sempervivum 'Pacific Blue Ice' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum 'Red Lion' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; almost none in winter | Pet-safe |
| Sempervivum 'Reinhard' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum calcareum | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth, only when the soil is fully dry; little to none in winter | Pet-safe |
| Sempervivum heuffelii | Direct sun (at least 4-6 hours) | When the soil is fully dry, sparingly; roughly every 2 weeks in summer and very little in winter | Pet-safe |
| Sempervivum montanum | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; keep nearly dry in winter | Pet-safe |
| Senecio macroglossus | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days; less in winter | Toxic to pets |
| Senecio macroglossus 'Variegatus' | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days; less in winter | Toxic to pets |
| Senita Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Pet-safe |
| Sensation Mixed cosmos | Direct sun (at least 4-6 hours) | Once or twice weekly until established; then only during prolonged dry spells | Pet-safe |
| Sensation Mixed cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; very drought tolerant once established | Pet-safe |
| Sensitive Fern | Medium indirect light (a couple of metres from a window) | Keep continuously moist to wet; check every 2-3 days | Mildly toxic to pets |
| Serbian Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing in the first two years; established trees rely on rainfall except in prolonged drought | Mildly toxic to pets |
| Serbian Spruce 'Pendula' | Direct sun (at least 4-6 hours) | Every 7-10 days for the first two years; thereafter mostly rainfall-dependent except in drought | Mildly toxic to pets |
| Serra Bromeliad | Bright indirect light (just back from a sunny window) | Occasional; drought-tolerant | Mildly toxic to pets |
| Sessile Elatostema | Low light (north window or shaded room) | Every 3–5 days; substrate should remain consistently moist | Pet-safe |
| Sessile Oak | Direct sun (at least 4-6 hours) | Rainfall-dependent once established; water deeply during the first 2–3 years | Mildly toxic to pets |
| Sessile-Leaf Tick Trefoil | Bright indirect light (just back from a sunny window) | Water every 10–14 days during establishment; once established it is drought-tolerant in typical dry woodland and upland conditions | Pet-safe |
| Sessile-leaved Bellwort | Medium indirect light (a couple of metres from a window) | Once or twice per week during the growing season; minimal watering needed once the plant enters summer dormancy. | Mildly toxic to pets |
| Sexy Pink Heliconia | Direct sun (at least 4-6 hours) | 2–3 times per week in summer, reducing in winter | Mildly toxic to pets |
| Seyrig's Caudex Vine | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in active growth; withhold almost entirely in winter rest | Mildly toxic to pets |
| Shadow Adromischus | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks in the active season; monthly in winter | Pet-safe |
| Shagbark manzanita | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; more frequent during the first 2 years | Pet-safe |
| Shaggy Shield Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Shaggy Wood Fern | Medium indirect light (a couple of metres from a window) | Regular; keep moist but not waterlogged | Pet-safe |
| Shallon | Medium indirect light (a couple of metres from a window) | Moderate; drought-tolerant once established | Mildly toxic to pets |
| Shand's Gibbaeum | Direct sun (at least 4-6 hours) | Every 2–4 weeks during active growth (autumn and spring); withheld in summer dormancy and reduced to once monthly or less in winter | Pet-safe |
| Sharp-fruited Abutilon | Direct sun (at least 4-6 hours) | Every 7–10 days when young; fortnightly once established | Pet-safe |
| Sharp-lobed Hepatica | Medium indirect light (a couple of metres from a window) | Every 5–7 days in spring; reduced to every 10–14 days in summer | Mildly toxic to pets |
| Sharp-Lobed Shield Fern | Medium indirect light (a couple of metres from a window) | Every 7–10 days; reduce in winter | Pet-safe |
| Sharp-tipped Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep roots consistently moist | Pet-safe |
| Sheep Laurel | Bright indirect light (just back from a sunny window) | Regular; keep soil consistently moist | Toxic to pets |
| sheep's fescue | Direct sun (at least 4-6 hours) | Very low; once established, relies on natural rainfall in temperate climates; water monthly if needed during prolonged drought | Pet-safe |
| Sheerwater Seedling rowan | Direct sun (at least 4-6 hours) | Regular through spring and summer for the first 2 years; minimal once established | Mildly toxic to pets |
| Shenandoah Switch Grass | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water deeply every 1-2 weeks while young | Mildly toxic to pets |
| Shenandoah Switchgrass | Direct sun (at least 4-6 hours) | Weekly during establishment (first season); monthly or as needed once established | Pet-safe |
| Shield Sundew | Direct sun (at least 4-6 hours) | Tray-water during active growth (autumn–spring); completely dry in summer. | Pet-safe |
| Shimpaku Juniper | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is just dry, often daily in summer heat | Toxic to pets |
| Shingle Oak | Direct sun (at least 4-6 hours) | Moderate; weekly irrigation for first 2 seasons; drought-tolerant once established | Mildly toxic to pets |
| Shingle Plant Hoya | Bright indirect light (just back from a sunny window) | When the mix is almost completely dry, roughly every 10-14 days in summer | Pet-safe |
| Shining Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; very sparsely in winter | Pet-safe |
| Shining Cranesbill | Bright indirect light (just back from a sunny window) | Low; water only in prolonged drought | Pet-safe |
| Shining fetterbush | Bright indirect light (just back from a sunny window) | Consistently moist to wet — do not allow prolonged drought | Toxic to pets |
| Shining Mandevilla | Direct sun (at least 4-6 hours) | 2-3 times per week in summer, reduce to every 10-14 days in winter | Mildly toxic to pets |
| Shining Nidularium | Medium indirect light (a couple of metres from a window) | Refill central cup weekly; substrate every 10–14 days | Pet-safe |
| Shining-Leaf Begonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer, every 10–14 days in winter | Toxic to pets |
| Shoestring Fern | Low light (north window or shaded room) | Keep the mount or medium consistently moist; mist or water every 2-4 days | Pet-safe |
| Shooting Star Hoya | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-9 days in growth | Pet-safe |
| Shore Juniper | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; regular watering for first 12 months | Mildly toxic to pets |
| Short-Frond Lady Fern | Low light (north window or shaded room) | Every 2–3 days; keep consistently moist | Pet-safe |
| Short-fronded Ceratozamia | Medium indirect light (a couple of metres from a window) | Every 2–4 weeks | Toxic to pets |
| Short-leaved Deuterocohnia | Direct sun (at least 4-6 hours) | Every 2 weeks in summer; monthly or less in winter | Pet-safe |
| Short-stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in winter | Mildly toxic to pets |
| Short-Stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in active growth; less in hot summer months | Pet-safe |
| Short-stemmed Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; medium kept evenly moist | Pet-safe |
| Showy Corytoplectus | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; reduce to every 10–14 days in winter. | Pet-safe |
| Showy Cranesbill | Bright indirect light (just back from a sunny window) | Weekly during spring and summer; minimal in autumn and winter | Pet-safe |
| Showy Goldenrod | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water in extended dry spells only | Pet-safe |
| Showy Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; once every 2–4 weeks during dry rest | Pet-safe |
| Showy Milkweed | Direct sun (at least 4-6 hours) | Water weekly the first season; once established water deeply only during prolonged drought | Toxic to pets |
| Showy Stonecrop | Direct sun (at least 4-6 hours) | Every 1–2 weeks in dry spells; drought-tolerant once established | Mildly toxic to pets |
| Showy Tick Trefoil | Direct sun (at least 4-6 hours) | Water weekly to every 10 days during dry spells in the first season; once established, tolerates moderate drought but prefers consistently moist soil | Pet-safe |
| Shrimp Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly weekly in summer | Mildly toxic to pets |
| Shrimp Plant | Bright indirect light (just back from a sunny window) | When the top 2–3 cm (1 in) of compost dries out | Pet-safe |
| Shrubby Adenia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; near-zero in winter | Toxic to pets |
| Shrubby Indian Mallow | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; monthly or as needed in winter | Pet-safe |
| Shrubby St John's Wort | Bright indirect light (just back from a sunny window) | Drought-tolerant once established; water through the first season | Toxic to pets |
| Shrubby St. John's Wort | Direct sun (at least 4-6 hours) | Once a week during establishment; drought-tolerant once established | Mildly toxic to pets |
| Siamese Sago Palm | Bright indirect light (just back from a sunny window) | Every 14–21 days in active growth; minimal in winter | Toxic to pets |
| Siberian Carpet Cypress | Medium indirect light (a couple of metres from a window) | Moderate — once established, largely drought-tolerant | Mildly toxic to pets |
| Siberian dogwood | Bright indirect light (just back from a sunny window) | Weekly when establishing; tolerates wet conditions long-term | Mildly toxic to pets |
| Siberian Elm Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil dries, typically daily in summer | Mildly toxic to pets |
| Siberian Fir | Direct sun (at least 4-6 hours) | Moderate; relies on snowmelt and seasonal rain | Pet-safe |
| Siberian Iris | Direct sun (at least 4-6 hours) | Regular — keep soil consistently moist | Toxic to pets |
| Siberian Lady Fern | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water when the top 2 cm begin to dry, roughly weekly in dry weather | Mildly toxic to pets |
| Siberian Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; low once established | Pet-safe |
| Sibthorp's Everlasting | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; sparingly in winter | Mildly toxic to pets |
| Sichuan Cycad | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–4 weeks in winter | Toxic to pets |
| Sickle-leaved Hare's-ear | Direct sun (at least 4-6 hours) | Every 10–14 days, allowing soil to dry between waterings | Mildly toxic to pets |
| Side Oats Grama | Direct sun (at least 4-6 hours) | Water to establish, then only in extreme drought | Mildly toxic to pets |
| Sidebells Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; monthly in cool or dormant seasons | Mildly toxic to pets |
| Sidebells Penstemon | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; monthly in cool seasons | Mildly toxic to pets |
| Siebold's Magnolia | Bright indirect light (just back from a sunny window) | Weekly throughout the growing season; reduce in winter | Pet-safe |
| Siebold's Wood Fern | Medium indirect light (a couple of metres from a window) | Moderate; allow slight drying between waterings once established | Pet-safe |
| Sierra Juniper | Direct sun (at least 4-6 hours) | When the soil has begun to dry; lean toward the dry side | Mildly toxic to pets |
| Sierra laurel | Medium indirect light (a couple of metres from a window) | Frequently; keep consistently moist | Toxic to pets |
| Signet Marigold 'Lemon Gem' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, every 4-7 days; containers more often | Mildly toxic to pets |
| Sikkim Larch | Direct sun (at least 4-6 hours) | Weekly during establishment, less once established | Pet-safe |
| Silberfeder Silver Feather Grass | Direct sun (at least 4-6 hours) | Weekly through the first season, then only in extended drought | Mildly toxic to pets |
| Silberlocke Korean Fir | Direct sun (at least 4-6 hours) | Regularly; maintain consistently moist soil | Mildly toxic to pets |
| Silk Floss Tree | Direct sun (at least 4-6 hours) | Every 7–14 days in summer; every 3–5 weeks in winter | Mildly toxic to pets |
| Silky Aster | Direct sun (at least 4-6 hours) | Low — drought tolerant | Pet-safe |
| Silky Lupine | Direct sun (at least 4-6 hours) | Low; deeply water every 2–3 weeks during the growing season; minimal water once dormant | Toxic to pets |
| Silky Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 10–14 days in growth; very sparingly in winter | Pet-safe |
| Silky Prairie Clover | Direct sun (at least 4-6 hours) | Very low — highly drought-tolerant; avoid overwatering | Mildly toxic to pets |
| silky thread grass | Direct sun (at least 4-6 hours) | Once established, water only during extended drought; every 2–3 weeks in hot, dry summers | Pet-safe |
| Silky wisteria | Direct sun (at least 4-6 hours) | Weekly during growing season; reduce in winter | Toxic to pets |
| Silver Ball Notocactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; once a month or less in winter | Pet-safe |
| Silver Brake Fern | Medium indirect light (a couple of metres from a window) | Twice weekly in summer; weekly in winter | Pet-safe |
| Silver Cluster Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in growth; withhold in winter | Pet-safe |
| Silver Crown | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer (growing season); every 3–4 weeks in autumn–winter | Toxic to pets |
| Silver Crown Cotyledon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring/summer; every 4–6 weeks in autumn/winter | Toxic to pets |
| Silver Date Palm | Direct sun (at least 4-6 hours) | Every 7–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Silver Dollar Jade | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Silver Dragon Lilyturf | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Pet-safe |
| Silver Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once established | Pet-safe |
| Silver Goldfish Plant | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of mix feels dry; approximately every 7 days in summer, every 10–14 days in winter | Pet-safe |
| Silver Goosefoot Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; every 10–14 days in winter | Toxic to pets |
| Silver Knight heather | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate watering once established | Pet-safe |
| Silver lace fern | Bright indirect light (just back from a sunny window) | Keep evenly moist — water as soon as the surface feels barely dry, often every 3-5 days | Pet-safe |
| Silver Lady Fern | Bright indirect light (just back from a sunny window) | When the top third of the compost is dry, roughly every 5-7 days in growth | Mildly toxic to pets |
| Silver Light Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; reduce in autumn and winter | Pet-safe |
| Silver Mediterranean Fan Palm | Direct sun (at least 4-6 hours) | Moderate; allow top 3–5 cm to dry between waterings | Pet-safe |
| Silver Mound Artemisia | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly every 7-10 days while establishing, then rarely | Toxic to pets |
| Silver Mullein | Direct sun (at least 4-6 hours) | Every 2–4 weeks when established; weekly for young transplants | Mildly toxic to pets |
| Silver Pagoda Dogwood | Bright indirect light (just back from a sunny window) | Regular throughout the growing season; do not allow to dry out | Mildly toxic to pets |
| Silver Pink Rock Rose | Direct sun (at least 4-6 hours) | Establish with regular watering in the first season; once established, water only during prolonged drought spells in summer. | Mildly toxic to pets |
| Silver Ragwort | Direct sun (at least 4-6 hours) | low — allow soil to dry between waterings | Toxic to pets |
| Silver Sage | Direct sun (at least 4-6 hours) | Fortnightly or when soil is dry | Pet-safe |
| silver spike grass | Direct sun (at least 4-6 hours) | Weekly in the first season; monthly deep watering once established | Pet-safe |
| Silver Spurflower | Bright indirect light (just back from a sunny window) | Water when the top 2–3 cm of compost is dry, roughly every 6–10 days in the growing season | Mildly toxic to pets |
| Silver Tansy | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent only when young | Mildly toxic to pets |
| Silver Torch Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer; keep dry in winter | Pet-safe |
| Silver-leaf Sinningia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; water very sparingly or not at all during dormancy | Pet-safe |
| Silverberry | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Silverleaf Peperomia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Silvery Lupine | Direct sun (at least 4-6 hours) | Low to moderate; water deeply every 2–3 weeks during the growing season; drought-tolerant once established | Toxic to pets |
| Silvery Stelis | Medium indirect light (a couple of metres from a window) | Every 1–2 days; keep medium consistently moist | Pet-safe |
| Silvery Yarrow | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Mildly toxic to pets |
| Simon Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in summer, once per week in winter | Pet-safe |
| Simple-leaf astilbe | Medium indirect light (a couple of metres from a window) | Consistently moist — water 2–3 times per week in dry spells | Pet-safe |
| Simpson's Juttadinteria | Direct sun (at least 4-6 hours) | Every 2–3 days in the active season (autumn and spring); very sparingly in summer | Mildly toxic to pets |
| Singapore Yellow Frangipani | Direct sun (at least 4-6 hours) | Weekly to fortnightly during active growth; very sparingly in winter dormancy | Toxic to pets |
| Single-Leaf Begonia | Medium indirect light (a couple of metres from a window) | Every 7–10 days (keep compost evenly moist but never waterlogged) | Toxic to pets |
| Sinomiyama Toad Lily | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water when the surface begins to dry, often twice weekly in summer | Mildly toxic to pets |
| sioux blue indian grass | Direct sun (at least 4-6 hours) | Regularly during first season; once established, water only during prolonged summer drought | Pet-safe |
| Siskiyou Blue Idaho Fescue | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; deep but infrequent once established | Mildly toxic to pets |
| Sitka Spruce | Direct sun (at least 4-6 hours) | Regular — keep soil consistently moist; very high natural rainfall in native habitat | Pet-safe |
| Six Hills Giant Catmint | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; about every 7-10 days while establishing, then seldom | Mildly toxic to pets |
| Skimmia japonica Kew White | Medium indirect light (a couple of metres from a window) | Maintain consistently moist soil; water deeply every 5-7 days in dry weather | Mildly toxic to pets |
| Skimmia japonica Rubella | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply every 5-7 days in dry spells, less in cool months | Mildly toxic to pets |
| Skimmia Pabella | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply every 5-7 days in dry spells | Mildly toxic to pets |
| Skimmia Temptation | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply every 5-7 days during dry periods | Mildly toxic to pets |
| Skinner's Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce to every 10–14 days in winter | Pet-safe |
| Sky Blue Aster | Direct sun (at least 4-6 hours) | Water to establish, then rarely; very drought-tolerant | Pet-safe |
| Sky Rocket Feather Top | Direct sun (at least 4-6 hours) | Weekly while establishing, then occasional deep watering in drought | Pet-safe |
| Skyrocket Juniper | Direct sun (at least 4-6 hours) | Every 7-10 days when establishing, then occasional deep soaks | Mildly toxic to pets |
| Sleeping Beauty Cymbidium | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce to every 10–14 days in autumn–winter | Pet-safe |
| Slender Aubrieta | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Mildly toxic to pets |
| Slender Iceplant | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry completely between waterings | Pet-safe |
| Slender Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–4 days in active growth; every 4–6 days in winter | Pet-safe |
| Slender Silhouette Sweetgum | Direct sun (at least 4-6 hours) | Weekly during the first 2–3 years; supplemental in drought once established | Mildly toxic to pets |
| Slender-lined Living Stones | Direct sun (at least 4-6 hours) | Very infrequent — one or two waterings during the autumn growth window (September–November); completely dry for 7–8 months of the year | Pet-safe |
| Slim-leaved Biarum | Direct sun (at least 4-6 hours) | Water sparingly in autumn and winter; keep completely dry from late spring through summer dormancy | Toxic to pets |
| Slowmound Mugo Pine | Direct sun (at least 4-6 hours) | Water weekly through the first growing season, then only during extended drought | Mildly toxic to pets |
| Small Japanese Silver Grass | Bright indirect light (just back from a sunny window) | Weekly during the first season; every 10–14 days once established, or as needed during drought. | Mildly toxic to pets |
| Small Scabious | Direct sun (at least 4-6 hours) | Moderate while establishing; reduced once rooted — water when the top few centimetres of soil are dry | Mildly toxic to pets |
| Small Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; drought-tolerant once established | Toxic to pets |
| Small Teasel | Medium indirect light (a couple of metres from a window) | Regular; keep soil reliably moist | Mildly toxic to pets |
| Small-flowered alumroot | Medium indirect light (a couple of metres from a window) | Weekly during the growing season; do not allow to dry out completely | Pet-safe |
| Small-flowered calibrachoa | Direct sun (at least 4-6 hours) | Every 2–3 days in warm weather; weekly when established or in cool periods | Mildly toxic to pets |
| Small-Flowered Cranesbill | Bright indirect light (just back from a sunny window) | Low; water sparingly and only in drought | Pet-safe |
| Small-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–5 weeks in winter | Pet-safe |
| Small-Leaved Lipstick Vine | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of mix has dried; roughly every 7–10 days in summer, every 12–14 days in winter | Pet-safe |
| Small's Beardtongue | Bright indirect light (just back from a sunny window) | Every 1–2 weeks; reduce in winter | Pet-safe |
| Smokebush 'Royal Purple' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly in the first season, then only in extended drought | Mildly toxic to pets |
| Smooth Arizona Cypress | Direct sun (at least 4-6 hours) | Infrequently; highly drought-tolerant once established | Mildly toxic to pets |
| Smooth Beardtongue | Bright indirect light (just back from a sunny window) | Weekly to every 10 days; adapts to both drought and periodic wet | Pet-safe |
| Smooth Blue Aster | Direct sun (at least 4-6 hours) | Water weekly until established, then sparingly | Pet-safe |
| Smooth Cane Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost feel dry | Toxic to pets |
| Smooth Coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Smooth Hydrangea 'Incrediball' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, often every 2-4 days in summer | Toxic to pets |
| Smooth Oxeye | Direct sun (at least 4-6 hours) | Every 1-2 weeks | Pet-safe |
| Smooth Phlox | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer; weekly when established | Pet-safe |
| Snake plant | Medium indirect light (a couple of metres from a window) | When the soil is bone dry, every 2-3 weeks | Toxic to pets |
| Snake Vine | Direct sun (at least 4-6 hours) | Low to moderate; highly drought tolerant once established | Mildly toxic to pets |
| Snapdragon Achimenes | Bright indirect light (just back from a sunny window) | Keep evenly moist during the growing season (spring–autumn); withhold entirely during winter dormancy | Pet-safe |
| Sneezeweed | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 4-7 days, more in heat | Toxic to pets |
| Sneezewort | Direct sun (at least 4-6 hours) | Weekly or more in dry spells; tolerates seasonal moisture | Mildly toxic to pets |
| Snow-in-Summer | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Pet-safe |
| Snowball Pincushion | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep dry through winter | Pet-safe |
| Snowcap Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Soap Aloe | Direct sun (at least 4-6 hours) | When soil is fully dry, every 1-2 weeks in warm growth | Toxic to pets |
| Sobralia macrantha | Bright indirect light (just back from a sunny window) | Water generously in active growth, keeping evenly moist; ease off in winter | Pet-safe |
| Soconusco Zamia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in growing season; every 3–4 weeks in winter | Toxic to pets |
| Socotra Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days during the growing season (autumn–spring); completely dry during summer dormancy | Toxic to pets |
| Soft Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep medium consistently moist; water every 2–4 days | Mildly toxic to pets |
| Soft Shield Fern | Low light (north window or shaded room) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Soidao Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in growth; reduce to every 3–4 weeks in cooler months | Pet-safe |
| Solanum crispum 'Glasnevin' | Direct sun (at least 4-6 hours) | Keep evenly moist in the first two seasons; water established plants during prolonged dry spells | Toxic to pets |
| Solanum laxum | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days in growth | Toxic to pets |
| Solanum laxum 'Album' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days in growth | Toxic to pets |
| Solidago 'Fireworks' | Direct sun (at least 4-6 hours) | Water weekly until established, then only in droughts | Mildly toxic to pets |
| Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; less frequent once established | Toxic to pets |
| Soncoya | Direct sun (at least 4-6 hours) | Twice weekly when young; weekly once established | Mildly toxic to pets |
| Sonerila heterostemon | Bright indirect light (just back from a sunny window) | Keep consistently moist in the growing season, watering as the surface starts to dry, about every 4-6 days | Mildly toxic to pets |
| Song of India | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Sonoran Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; every 4–6 weeks or less in winter | Toxic to pets |
| Sonoran Ibervillea | Bright indirect light (just back from a sunny window) | Every 14–21 days in summer; very sparingly in winter | Mildly toxic to pets |
| Sooty Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce to every 10–14 days in winter | Pet-safe |
| Sophronitis coccinea | Bright indirect light (just back from a sunny window) | Every 2-4 days; keep evenly moist year-round | Pet-safe |
| Sorbus 'Joseph Rock' | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees need water only in extended drought | Mildly toxic to pets |
| Sorbus aria | Direct sun (at least 4-6 hours) | Water weekly in the first two growing seasons; established trees are markedly drought-tolerant | Mildly toxic to pets |
| Sorbus hupehensis | Direct sun (at least 4-6 hours) | Water weekly through the first two seasons; established trees are fairly drought-tolerant | Mildly toxic to pets |
| Soursop | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil dries | Mildly toxic to pets |
| Southern Japanese Hemlock | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduced in winter | Pet-safe |
| Southern Lady Fern | Medium indirect light (a couple of metres from a window) | Every 2–4 days in warm weather; soil should never fully dry out | Mildly toxic to pets |
| Southern Magnolia | Direct sun (at least 4-6 hours) | Deeply once a week for the first two seasons; established trees need water only in drought | Pet-safe |
| Southern Magnolia 'Little Gem' | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 1-2 weeks in dry weather | Pet-safe |
| Southern Maidenhair Fern | Bright indirect light (just back from a sunny window) | Frequent — keep soil consistently moist | Pet-safe |
| Southern Shield Fern | Bright indirect light (just back from a sunny window) | Water when the top 3-4 cm of soil dries out, roughly every 5-10 days in summer; reduce in winter | Mildly toxic to pets |
| Spanish Bluebell | Medium indirect light (a couple of metres from a window) | Low to moderate; largely self-sufficient once established | Toxic to pets |
| Spanish Draba | Direct sun (at least 4-6 hours) | Water sparingly; allow soil to dry between waterings | Pet-safe |
| Spanish Fir | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; minimal once mature | Pet-safe |
| Spanish Gorse | Direct sun (at least 4-6 hours) | Low — water only to establish; drought-tolerant thereafter | Toxic to pets |
| Spanish heath | Direct sun (at least 4-6 hours) | Weekly during establishment; fortnightly in summer once established | Pet-safe |
| Spanish Houseleek | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month in winter | Pet-safe |
| Spanish Juniper | Direct sun (at least 4-6 hours) | Water fortnightly when young; essentially self-sufficient once established | Mildly toxic to pets |
| Spanish love-in-a-mist | Direct sun (at least 4-6 hours) | Weekly during dry periods | Mildly toxic to pets |
| Spanish snapdragon | Direct sun (at least 4-6 hours) | Once established, every 7–14 days in summer; rarely in winter | Mildly toxic to pets |
| Spanish Stonecrop | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in very dry spells | Pet-safe |
| Sparkler Palm Sedge | Medium indirect light (a couple of metres from a window) | Every 5-7 days or when the top 2 cm of soil is dry | Pet-safe |
| Spartan Cliff Stonecrop | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; monthly or less in autumn/winter | Mildly toxic to pets |
| Spathoglottis plicata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix begins to dry, roughly every 3-5 days in warmth | Pet-safe |
| Spear Head | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–5 weeks in autumn and winter | Toxic to pets |
| spear-leaved arrowhead vine | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 10–14 days in winter | Toxic to pets |
| Spencer Mixed sweet pea | Direct sun (at least 4-6 hours) | Every 5–7 days; keep roots evenly moist | Mildly toxic to pets |
| Spencer Waved sweet pea | Direct sun (at least 4-6 hours) | Every 2–4 days in warm weather; every 5–7 days in cool spells | Toxic to pets |
| Spider Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| Spider Iris | Direct sun (at least 4-6 hours) | Moderate in winter growing season; bone dry in summer dormancy | Toxic to pets |
| Spider Milkweed | Direct sun (at least 4-6 hours) | Low; deep watering every 2–4 weeks once established | Toxic to pets |
| Spike Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season; sparingly in winter (once a month or less) | Pet-safe |
| Spike heath | Direct sun (at least 4-6 hours) | Low to moderate — once established, water only during prolonged drought | Pet-safe |
| Spike Moss | Medium indirect light (a couple of metres from a window) | Keep evenly moist at all times; typically water every 2-4 days so the soil never dries out | Pet-safe |
| Spiked Pleurothallis | Medium indirect light (a couple of metres from a window) | Daily in summer; every 2–3 days in winter | Pet-safe |
| spiked sedge | Bright indirect light (just back from a sunny window) | Moderate; water weekly in dry spells once established | Pet-safe |
| Spiked speedwell | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Pet-safe |
| Spiny Adenia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; completely dry in winter | Toxic to pets |
| Spiny Billbergia | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Spiny Club Cactus | Direct sun (at least 4-6 hours) | When soil is dry, about every 10-14 days in summer; little to none in winter | Pet-safe |
| Spiny Fuchsia | Direct sun (at least 4-6 hours) | Infrequent — allow soil to dry between waterings | Pet-safe |
| Spiny Germander | Direct sun (at least 4-6 hours) | Very infrequently once established; water lightly only during extreme summer drought | Mildly toxic to pets |
| Spiny Orostachys | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; almost none in winter dormancy | Pet-safe |
| Spiraea 'Gold Flame' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about once per week | Mildly toxic to pets |
| Spiraea 'Little Princess' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about once per week | Mildly toxic to pets |
| Spiraea betulifolia 'Tor' | Direct sun (at least 4-6 hours) | Weekly when young; during dry spells only once established | Mildly toxic to pets |
| Spiraea nipponica 'Snowmound' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about once per week | Mildly toxic to pets |
| Spiraea prunifolia | Direct sun (at least 4-6 hours) | Weekly while establishing; only in extended dry spells once mature | Mildly toxic to pets |
| Spiraea thunbergii 'Ogon' | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in droughts | Mildly toxic to pets |
| Spiraea x vanhouttei | Direct sun (at least 4-6 hours) | Weekly in the first year; established plants need water only in prolonged drought | Mildly toxic to pets |
| Splendid Zamia | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; every 21 days in winter | Toxic to pets |
| Split Rock | Direct sun (at least 4-6 hours) | Soak-and-dry, only when fully dry — roughly every 2-3 weeks in active growth; little to none in summer and winter | Pet-safe |
| Spotted Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; once monthly or less in winter | Mildly toxic to pets |
| Spotted Corn Lily | Direct sun (at least 4-6 hours) | Moderate in growth; completely dry in summer dormancy | Mildly toxic to pets |
| Spotted Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 5–7 days in active growth; reduce to every 10–14 days in cool or dormant periods | Pet-safe |
| Spotted Gasteria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Spotted Joe Pye Weed | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water weekly or more in dry spells | Pet-safe |
| Spottted Horsemint | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought, roughly every 10-14 days | Mildly toxic to pets |
| Spreading Achimenes | Bright indirect light (just back from a sunny window) | Evenly moist during the growing season; completely dry during winter rhizome dormancy | Pet-safe |
| Spreading Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; reduce in winter | Toxic to pets |
| Spreading-Flower Guzmania | Bright indirect light (just back from a sunny window) | Top up cup every 5–10 days; water medium every 2 weeks | Pet-safe |
| Spring Beauty | Medium indirect light (a couple of metres from a window) | Moderate during active growth (February–May); none needed during summer dormancy. | Pet-safe |
| Spring Cinquefoil | Direct sun (at least 4-6 hours) | Rarely once established; drought-tolerant | Pet-safe |
| Spring Cinquefoil (Potentilla tabernaemontani) | Direct sun (at least 4-6 hours) | Rarely; drought-tolerant once established | Pet-safe |
| Spring Meadow Saffron | Direct sun (at least 4-6 hours) | Rainfall-dependent through winter and spring; dry summer rest | Toxic to pets |
| Spring Symphony Foamflower | Medium indirect light (a couple of metres from a window) | Approximately every 5–7 days; more frequently in heat or drought | Pet-safe |
| Spring Symphony Tiarella | Medium indirect light (a couple of metres from a window) | Keep consistently moist; deep-water once or twice weekly during dry weather | Mildly toxic to pets |
| Springwood White winter heath | Direct sun (at least 4-6 hours) | Weekly for new plantings; established plants tolerate dry spells with watering every 2–3 weeks | Pet-safe |
| Spurred Vanhouttea | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow top 2 cm to dry slightly between waterings | Pet-safe |
| Square Leaf Hoya | Bright indirect light (just back from a sunny window) | When the top third of the mix dries out (roughly weekly in summer, every 2 weeks in winter) | Pet-safe |
| Square-stemmed Pelargonium | Direct sun (at least 4-6 hours) | Water very sparingly — every 14-21 days in the growing season; almost none in winter | Toxic to pets |
| Squinancywort | Direct sun (at least 4-6 hours) | Rarely — only during prolonged drought | Mildly toxic to pets |
| Squirrel's Paw Fern | Bright indirect light (just back from a sunny window) | Every 5–8 days in the growing season, every 10–14 days in cooler months | Pet-safe |
| St Dabeoc's heath | Direct sun (at least 4-6 hours) | Moderate; water regularly to keep soil evenly moist, especially in the first year | Pet-safe |
| Staghorn fern | Bright indirect light (just back from a sunny window) | Soak the mount weekly in summer, every 2-3 weeks in winter | Pet-safe |
| Standish's Golden Yew | Direct sun (at least 4-6 hours) | Moderate — once established, rarely needs irrigation in UK climates | Toxic to pets |
| Standishii Yew | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Standley's Zamia | Medium indirect light (a couple of metres from a window) | Every 7–14 days in growing season; every 3 weeks in winter | Toxic to pets |
| Stanhopea oculata | Bright indirect light (just back from a sunny window) | When the basket surface begins to dry, often every 2-4 days in growth | Pet-safe |
| Stanhopea tigrina | Bright indirect light (just back from a sunny window) | Every 2-4 days in warm active growth; weekly in cooler, shorter days | Pet-safe |
| Stanhopea wardii | Bright indirect light (just back from a sunny window) | When the basket surface starts to dry, roughly every 2-4 days in active growth | Pet-safe |
| Stapelia flavopurpurea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Pet-safe |
| Stapelia grandiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia hirsuta | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia leendertziae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Pet-safe |
| Stapelia variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Star Cactus | Direct sun (at least 4-6 hours) | Every 2-4 weeks in spring/summer; roughly monthly or less in winter | Pet-safe |
| Star Jasmine | Bright indirect light (just back from a sunny window) | Water regularly to establish; once mature, water during dry spells when the top few cm of soil dries | Pet-safe |
| Star Magnolia | Direct sun (at least 4-6 hours) | Keep moist while establishing; water deeply weekly in dry spells for the first few years | Pet-safe |
| Star Magnolia 'Royal Star' | Direct sun (at least 4-6 hours) | Weekly while young, then in dry periods | Pet-safe |
| Star of Bethlehem | Direct sun (at least 4-6 hours) | Infrequent; relies on natural rainfall in most temperate gardens | Toxic to pets |
| Star Window Plant | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Pet-safe |
| Star-fruited Uncarina | Direct sun (at least 4-6 hours) | Every 10–14 days in growing season; completely dry during winter dormancy | Mildly toxic to pets |
| Stardust Dendrobium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in winter rest | Pet-safe |
| Starfish Sansevieria | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks (longer in winter) | Toxic to pets |
| Starflower | Medium indirect light (a couple of metres from a window) | Regular; keep soil consistently moist throughout the growing season (spring through autumn). | Pet-safe |
| Starflower pincushion | Direct sun (at least 4-6 hours) | Every 6–8 days during active growth | Pet-safe |
| Starfruit | Direct sun (at least 4-6 hours) | Every 3-7 days, keeping soil consistently moist; carambola is not drought-tolerant | Toxic to pets |
| Starina Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Starry Rosinweed | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Starry Solomon's Seal | Medium indirect light (a couple of metres from a window) | Regular, keeping soil evenly moist | Mildly toxic to pets |
| Statice | Direct sun (at least 4-6 hours) | Low to moderate — allow soil to dry between waterings | Pet-safe |
| Statice sea lavender | Direct sun (at least 4-6 hours) | Once weekly; allow the top 2–3 cm of soil to dry between waterings | Pet-safe |
| Steeds Japanese Holly | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 7-14 days during dry spells | Toxic to pets |
| Stemless African Daisy | Direct sun (at least 4-6 hours) | Every 10–14 days (moderate); reduce in dry periods once established | Mildly toxic to pets |
| Stemless Thistle | Direct sun (at least 4-6 hours) | Very low — fully drought tolerant | Mildly toxic to pets |
| Stenocactus crispatus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; keep dry in winter | Pet-safe |
| Stephan's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late August through November (active growth); withheld completely from May to late August | Pet-safe |
| Stepladder Ginger | Medium indirect light (a couple of metres from a window) | Regular but drought tolerant once established | Mildly toxic to pets |
| Steppe Sage | Direct sun (at least 4-6 hours) | Low — every 10–14 days in summer, minimal in winter | Mildly toxic to pets |
| Sterling Silver Linden | Direct sun (at least 4-6 hours) | Weekly during the first 2 years; monthly deep watering once established | Pet-safe |
| Stewartia monadelpha | Bright indirect light (just back from a sunny window) | Weekly; keep soil consistently moist but well-drained | Pet-safe |
| Stewartia pseudocamellia | Bright indirect light (just back from a sunny window) | Weekly; keep soil consistently moist but never waterlogged | Pet-safe |
| Sticky Jerusalem Sage | Direct sun (at least 4-6 hours) | Once every 2 weeks in summer; suspend watering October–March except in prolonged drought | Mildly toxic to pets |
| Stiff Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly weekly in growth | Toxic to pets |
| Stiff Goldenrod | Direct sun (at least 4-6 hours) | Highly drought-tolerant; water only in prolonged drought | Pet-safe |
| Stiff Sunflower | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Stiff twinspur | Direct sun (at least 4-6 hours) | 2–3 times per week in active growth; once per week when established in cooler weather | Pet-safe |
| Stiff-leaved Aponogeton | Medium indirect light (a couple of metres from a window) | Permanently submerged; fortnightly 25% water changes as a minimum | Pet-safe |
| Stinking Iris | Low light (north window or shaded room) | Low to moderate — drought-tolerant once established | Toxic to pets |
| Stinking Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist to damp through the growing season; reduce after summer dormancy | Mildly toxic to pets |
| Stolonifera Palm | Low light (north window or shaded room) | Every 10–14 days in summer, every 2–3 weeks in winter | Pet-safe |
| Stoloniferous Sundew | Bright indirect light (just back from a sunny window) | Tray method during winter growing season; completely dry during summer dormancy | Mildly toxic to pets |
| Stone Gate Palm | Direct sun (at least 4-6 hours) | Weekly in summer, fortnightly in winter | Pet-safe |
| Stone Mimicry Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn and spring; almost none in summer (June–August in the Northern Hemisphere) | Mildly toxic to pets |
| Stonecrop Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Pet-safe |
| Stonecrop-leaf Aichryson | Bright indirect light (just back from a sunny window) | Every 10–14 days in the active growing season (autumn to spring); once a month or less in summer | Pet-safe |
| Stoneham Gold Western Red Cedar | Direct sun (at least 4-6 hours) | Weekly when young; less once established | Mildly toxic to pets |
| Strachey's Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days during the growing season; reduce in winter | Pet-safe |
| Strap-leaf Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 2–3 days in active growth; reduce slightly during winter dormancy | Pet-safe |
| Straw Foxglove | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about weekly in dry weather | Toxic to pets |
| Straw-red Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established; weekly for new plants | Pet-safe |
| Strawberries and Cream Ribbon Grass | Bright indirect light (just back from a sunny window) | Adaptable; moist soil gives best colour but tolerates drought once established | Mildly toxic to pets |
| Strawberry Begonia | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about every 5-7 days | Pet-safe |
| Strawberry Fields gomphrena | Direct sun (at least 4-6 hours) | Weekly; drought-tolerant once established | Pet-safe |
| Strawberry globe amaranth | Direct sun (at least 4-6 hours) | Every 7–14 days once established; moderate during establishment | Pet-safe |
| Strawberry Guava | Direct sun (at least 4-6 hours) | Every 5-10 days, keeping soil evenly moist while fruiting; tolerates short dry spells once established | Mildly toxic to pets |
| Strawflower | Direct sun (at least 4-6 hours) | Every 7–10 days; very drought-tolerant | Mildly toxic to pets |
| Streptocarpus saxorum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-12 days | Pet-safe |
| Strictus Porcupine Grass | Direct sun (at least 4-6 hours) | Weekly to establish, then during dry spells; benefits from steady moisture | Mildly toxic to pets |
| String Bean Hoya | Bright indirect light (just back from a sunny window) | When the soil is almost fully dry, roughly every 10-14 days | Pet-safe |
| String of bananas | Bright indirect light (just back from a sunny window) | When soil is dry, every 14 days | Toxic to pets |
| String of Buttons | Direct sun (at least 4-6 hours) | Every 1-2 weeks in growing season; roughly monthly in winter | Mildly toxic to pets |
| String of dolphins | Bright indirect light (just back from a sunny window) | When soil is dry, every 10-14 days | Toxic to pets |
| String of Fishhooks | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| String of Frogs | Bright indirect light (just back from a sunny window) | When the top 1-2 cm (top inch) of soil is dry, often 1-2x per week in spring/summer | Toxic to pets |
| String of hearts | Bright indirect light (just back from a sunny window) | When soil is dry, every 10-14 days | Pet-safe |
| String of Hearts 'Silver Glory' | Bright indirect light (just back from a sunny window) | When the top half of the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| String of needles | Bright indirect light (just back from a sunny window) | When soil is dry, every 10-14 days | Mildly toxic to pets |
| String of pearls | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| String of Pearls | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in autumn and winter | Toxic to pets |
| String of pickles | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks | Mildly toxic to pets |
| String of Raindrops | Bright indirect light (just back from a sunny window) | When the compost is dry right through, roughly every 10-14 days in summer and every 3-4 weeks in winter | Toxic to pets |
| String of Spades | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days | Pet-safe |
| String of Teardrops | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); once a month or less in summer dormancy | Toxic to pets |
| String of Tears | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| String of Turtles | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 10–14 days in winter | Pet-safe |
| String of Watermelons | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; once a month or less in winter | Toxic to pets |
| Striped Goldfish Plant | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry | Pet-safe |
| Striped Nananthus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in summer | Mildly toxic to pets |
| Striped Squill | Bright indirect light (just back from a sunny window) | Regular during growth; dry when dormant | Mildly toxic to pets |
| Striped Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in winter (growing season); suspend almost entirely in summer | Toxic to pets |
| Strobilanthes gossypinus | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Strobilanthes kunthianus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days in the growing season | Mildly toxic to pets |
| stromanthe | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Stromanthe Sanguinea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is just dry, roughly every 5-7 days in growth | Pet-safe |
| Subalpine Fir | Direct sun (at least 4-6 hours) | Regular watering during establishment; naturally sustained by snowmelt and high-altitude precipitation | Pet-safe |
| Subalpine Larch | Direct sun (at least 4-6 hours) | Moderate; supplemental irrigation during dry summers | Pet-safe |
| Sugar Apple | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm dries; tolerates drying between waterings | Mildly toxic to pets |
| Sugarcane Plume Grass | Direct sun (at least 4-6 hours) | Keep evenly moist; water weekly in dry spells, more in containers | Mildly toxic to pets |
| Sulawesi Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Sulcorebutia steinbachii | Direct sun (at least 4-6 hours) | When fully dry in summer, roughly every 10-14 days; none in winter | Pet-safe |
| Sullivant's Milkweed | Direct sun (at least 4-6 hours) | Regular; maintain consistent moisture | Toxic to pets |
| Sulphur Clover | Bright indirect light (just back from a sunny window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Sulphur Cosmos | Direct sun (at least 4-6 hours) | Water until established, then only in extended drought; highly drought-tolerant | Pet-safe |
| Sulphur Sawara Cypress | Bright indirect light (just back from a sunny window) | Regular during establishment; moderate once established | Mildly toxic to pets |
| Sulphureum Epimedium | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 1-2 weeks | Mildly toxic to pets |
| Summer Hyacinth | Direct sun (at least 4-6 hours) | Regular during spring and summer; reduce in autumn and winter | Pet-safe |
| Summit Sage | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Sun Cup Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; monthly or less in autumn and winter | Pet-safe |
| Sunblaze Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in summer | Pet-safe |
| Sungold Cypress | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply weekly in the first 2 years, then every 10-14 days in dry spells | Toxic to pets |
| Sunningdale Silver Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; thereafter only in extended drought | Pet-safe |
| Sunrise Crown Cactus | Direct sun (at least 4-6 hours) | When fully dry, roughly every 12-16 days in growth; none in winter | Pet-safe |
| Sunset Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days once established | Pet-safe |
| Super Kabuto Star Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| Super King Ixora | Direct sun (at least 4-6 hours) | Every 2-3 days in active growing season, weekly in winter | Mildly toxic to pets |
| Super King Ixora Red | Direct sun (at least 4-6 hours) | Every 5–7 days; maintain consistent moisture without waterlogging | Pet-safe |
| Super Silver Chalk Dudleya | Direct sun (at least 4-6 hours) | Fortnightly in autumn and winter (active growth); monthly to none in summer (dormant) | Mildly toxic to pets |
| Superb pink | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant once established | Mildly toxic to pets |
| Superb Stelis | Medium indirect light (a couple of metres from a window) | Every 2–3 days; mounted plants may need daily watering in summer | Pet-safe |
| Superba Astilbe | Bright indirect light (just back from a sunny window) | Keep soil moist; water when the top 2-3 cm dries, roughly every 4-6 days in summer | Mildly toxic to pets |
| Superba Rodgersia | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water deeply 1-2 times weekly, more in heat | Mildly toxic to pets |
| Supertunia bubblegum petunia | Direct sun (at least 4-6 hours) | Every 2–4 days in containers in heat; every 5–7 days in borders | Pet-safe |
| Surinam Cherry | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil dries, roughly weekly; less once established | Mildly toxic to pets |
| Susan Magnolia | Direct sun (at least 4-6 hours) | Weekly during establishment (2–3 years); every 10–14 days when mature in dry weather | Mildly toxic to pets |
| Swamp doghobble | Medium indirect light (a couple of metres from a window) | Frequently; keep soil consistently moist | Toxic to pets |
| Swamp Loosestrife | Bright indirect light (just back from a sunny window) | Continuously — requires saturated soil or shallow water | Mildly toxic to pets |
| Swamp Milkweed | Direct sun (at least 4-6 hours) | Keep consistently moist; water during dry spells and never let it dry out for long | Toxic to pets |
| Swamp Rose Mallow | Direct sun (at least 4-6 hours) | Frequently; keep soil moist, tolerates wet conditions | Mildly toxic to pets |
| Swamp Tupelo | Direct sun (at least 4-6 hours) | Constantly moist to permanently flooded | Mildly toxic to pets |
| Sweet alyssum | Bright indirect light (just back from a sunny window) | Every 5–7 days; drought-tolerant once established | Pet-safe |
| Sweet Birch | Direct sun (at least 4-6 hours) | Moderate; water deeply during drought; established trees on suitable sites are largely self-sufficient | Pet-safe |
| Sweet Black-Eyed Susan | Direct sun (at least 4-6 hours) | Weekly in the first growing season; every 10–14 days when established | Pet-safe |
| Sweet Clockvine | Direct sun (at least 4-6 hours) | Every 5–7 days; allow the top soil to partially dry between waterings | Mildly toxic to pets |
| Sweet Granadilla | Direct sun (at least 4-6 hours) | Every 4-7 days, keeping soil evenly moist during growth and fruiting; avoid both drought and waterlogging | Mildly toxic to pets |
| Sweet Pea 'Cupani' | Direct sun (at least 4-6 hours) | Every 2-3 days in growth, more in heat; keep soil evenly moist | Mildly toxic to pets |
| Sweet Pea 'Spencer' | Direct sun (at least 4-6 hours) | Every 2-3 days, keeping soil consistently moist | Mildly toxic to pets |
| Sweet sultan | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Sweet White Violet | Medium indirect light (a couple of metres from a window) | Regular; keep soil consistently moist | Pet-safe |
| Sweetbay Magnolia | Direct sun (at least 4-6 hours) | Keep soil consistently moist; weekly deep watering when young and during dry spells | Pet-safe |
| Sweetbells Leucothoe | Medium indirect light (a couple of metres from a window) | Regularly throughout the growing season; do not allow to dry out | Toxic to pets |
| Sweetbriar Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then minimal | Pet-safe |
| Swollen-stem Tylecodon | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); once monthly or none in summer | Toxic to pets |
| Sword-Leaved Phlox | Direct sun (at least 4-6 hours) | Weekly until established; monthly or less once established in well-drained soil | Pet-safe |
| Syagrus Romanzoffiana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-10 days in heat | Pet-safe |
| Sylvester Date Palm | Direct sun (at least 4-6 hours) | Deeply every 7-14 days while establishing, then drought-tolerant | Pet-safe |
| Symphyotrichum laeve 'Bluebird' | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged dry spells once settled | Pet-safe |
| Symphyotrichum novi-belgii 'Fellowship' | Direct sun (at least 4-6 hours) | Keep soil reliably moist; water deeply, around weekly, never letting roots dry | Pet-safe |
| Symphyotrichum oblongifolium 'Raydon's Favorite' | Direct sun (at least 4-6 hours) | Weekly during the first season; once established, only in prolonged drought | Pet-safe |
| Syngonium rayii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days in growth | Toxic to pets |
| Table Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is just barely dry, roughly every 4-7 days | Pet-safe |
| Tahitian Gardenia | Direct sun (at least 4-6 hours) | Every 5–7 days when in active growth; every 10–14 days in cooler months | Mildly toxic to pets |
| Tailed Aechmea | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); refresh central tank monthly | Pet-safe |
| Tailed Brake Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days in the growing season; every 7 days in winter | Pet-safe |
| Taiwan Felt Fern | Bright indirect light (just back from a sunny window) | Every 7-10 days; allow surface to dry between waterings | Pet-safe |
| Taiwan Shell Ginger | Bright indirect light (just back from a sunny window) | Regularly; keep soil evenly moist during the growing season | Mildly toxic to pets |
| Tall Bluebells | Bright indirect light (just back from a sunny window) | Water deeply 2–3 times weekly; never allow to dry out in growing season | Pet-safe |
| Tall Coreopsis | Direct sun (at least 4-6 hours) | Low once established; water weekly during the first growing season | Pet-safe |
| Tall Goldenrod | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water only in extended dry spells | Pet-safe |
| Tall Green Milkweed | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Toxic to pets |
| Tall Ironweed | Direct sun (at least 4-6 hours) | Keep evenly moist; water weekly in dry spells, more in heat | Mildly toxic to pets |
| Tall Moor Grass | Bright indirect light (just back from a sunny window) | Regular; keep soil evenly moist | Pet-safe |
| tall purple moor grass | Bright indirect light (just back from a sunny window) | Regularly during establishment; once established, water only in prolonged dry spells | Pet-safe |
| Tall Verbena | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days once established | Mildly toxic to pets |
| Tamanu | Direct sun (at least 4-6 hours) | Weekly when established; more frequent for young trees | Mildly toxic to pets |
| Tamarack | Direct sun (at least 4-6 hours) | Regular; tolerates seasonally wet or boggy conditions | Pet-safe |
| Tamarillo | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 4-7 days in warm weather | Toxic to pets |
| Tamarind | Direct sun (at least 4-6 hours) | Water moderately; let the top few cm of soil dry between waterings, roughly weekly | Toxic to pets |
| Tamarix-leaf Savin Juniper | Direct sun (at least 4-6 hours) | Low — very drought-tolerant once established | Toxic to pets |
| Tangerine Beauty Crossvine | Bright indirect light (just back from a sunny window) | Weekly until established; drought-tolerant thereafter | Mildly toxic to pets |
| Tannenbaum Mugo Pine | Direct sun (at least 4-6 hours) | Water weekly the first year to establish, then during prolonged dry spells only | Mildly toxic to pets |
| Tanquana hilmarii | Direct sun (at least 4-6 hours) | Sparing from autumn to spring; withhold in summer | Mildly toxic to pets |
| Tanquana prismatica | Direct sun (at least 4-6 hours) | Sparing in autumn-spring; near-zero in summer | Mildly toxic to pets |
| Tar-scented Vriesea | Bright indirect light (just back from a sunny window) | Refill central cup weekly; allow potting medium to remain almost completely dry | Pet-safe |
| Taraw Palm | Direct sun (at least 4-6 hours) | Regularly during establishment; moderately once mature | Pet-safe |
| Tasmanian Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about every 5-7 days | Pet-safe |
| Tassel Grape Hyacinth | Direct sun (at least 4-6 hours) | Minimal; drought-tolerant once established | Toxic to pets |
| Tatting Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; reduce in winter | Pet-safe |
| Tavaresia barklyi | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in warm growth; keep nearly dry in winter | Mildly toxic to pets |
| Tavaresia grandiflora | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in warm growth; keep nearly dry in winter | Mildly toxic to pets |
| Tawny Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water sparingly in autumn (September–November) during active growth; keep completely dry in winter and summer | Pet-safe |
| Teague's Porroglossum | Medium indirect light (a couple of metres from a window) | Every 2–4 days; allow medium surface to dry slightly between waterings | Pet-safe |
| Teddy Bear Palm | Direct sun (at least 4-6 hours) | Every 3–5 days when established in ground; check containers daily in summer | Pet-safe |
| Teddy Bear sunflower | Direct sun (at least 4-6 hours) | Weekly, or every 5–7 days during dry spells | Pet-safe |
| Teddy Bear Vine | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil feel dry, roughly every 7–10 days year-round | Pet-safe |
| Tennessee Coneflower | Direct sun (at least 4-6 hours) | Water to establish, then only during extended drought | Pet-safe |
| Teotl Palo | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; every 4–6 weeks in winter or none | Mildly toxic to pets |
| Tephrocactus | Direct sun (at least 4-6 hours) | When the mix is completely dry, sparingly every 2-3 weeks in summer; keep bone-dry in winter | Mildly toxic to pets |
| Tessellated Colchicum | Direct sun (at least 4-6 hours) | Minimal; water lightly after planting, then rely on rainfall during autumn–spring growth | Toxic to pets |
| Tessellated Vanda | Direct sun (at least 4-6 hours) | Daily in heat; every 2-3 days in cool, low-light spells | Pet-safe |
| Tete Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; once a month or less in winter | Toxic to pets |
| Tetragona Aurea Hinoki Cypress | Direct sun (at least 4-6 hours) | Every 5-7 days when young, then when the top few cm of soil dry | Mildly toxic to pets |
| Texas Blazing Star | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; minimal once established | Pet-safe |
| Texas Bluebonnet Subsp. | Direct sun (at least 4-6 hours) | Low; relies on autumn and winter rainfall; no regular supplemental watering needed once established | Toxic to pets |
| Texas Rainbow Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Pet-safe |
| Texas Sacahuista | Direct sun (at least 4-6 hours) | Every 3–4 weeks in the growing season; monthly or less in winter | Mildly toxic to pets |
| Teysmann's Medinilla | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; every 10–14 days in the winter rest period | Mildly toxic to pets |
| Thai Mountain Palm | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer, fortnightly in cooler months | Pet-safe |
| Thai Silk California poppy | Direct sun (at least 4-6 hours) | Once weekly during establishment; every 2 weeks once established | Mildly toxic to pets |
| Thalictrum aquilegiifolium | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water in dry spells | Mildly toxic to pets |
| Thalictrum delavayi 'Hewitt's Double' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water regularly in dry weather, do not let it dry out | Mildly toxic to pets |
| Thalictrum rochebrunianum | Bright indirect light (just back from a sunny window) | About twice a week, keeping soil evenly moist | Toxic to pets |
| Thatch Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-12 days, less in cool weather | Mildly toxic to pets |
| The Blues Little Bluestem | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the first growing season; minimal once established | Pet-safe |
| The Blues Little Bluestem | Direct sun (at least 4-6 hours) | Weekly for first season; every 3–4 weeks or rain-fed once established | Pet-safe |
| The Bride pearlbush | Direct sun (at least 4-6 hours) | Weekly during establishment; once established, every 2–3 weeks or during dry spells | Pet-safe |
| The Fairy Rose | Direct sun (at least 4-6 hours) | Deeply once a week in the growing season, more during heatwaves | Pet-safe |
| The Governor lupine | Direct sun (at least 4-6 hours) | Every 7–10 days; less once established | Toxic to pets |
| Therese Bugnet Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Thessalian Aubrieta | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Mildly toxic to pets |
| Thick Gongora | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; every 10–14 days in winter rest | Pet-safe |
| Thick-footed Operculicarya | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; withheld in winter dormancy | Mildly toxic to pets |
| Thick-leaf Goldfish Plant | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry | Pet-safe |
| Thick-stemmed Aichryson | Bright indirect light (just back from a sunny window) | Every 10–15 days during active growth (spring–summer); very sparingly in winter | Mildly toxic to pets |
| Thimble Cactus | Direct sun (at least 4-6 hours) | When fully dry, roughly every 10-14 days in summer; keep nearly dry in winter | Pet-safe |
| Thin-Leaved Air Plant | Bright indirect light (just back from a sunny window) | 2–3 times per week | Pet-safe |
| Thin-Leaved Sunflower | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks; keep moderately moist | Pet-safe |
| Thistle Sage | Direct sun (at least 4-6 hours) | Very infrequent — once established, monthly or less in summer | Pet-safe |
| Thorn Apple | Direct sun (at least 4-6 hours) | Moderate, once or twice a week in dry spells | Toxic to pets |
| Thorny Adenia | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer growing season; none in winter dormancy | Toxic to pets |
| Thorny Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during establishment and growing season; drought-tolerant once established | Pet-safe |
| Thorny Chin Cactus | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; every 5–8 weeks in winter | Pet-safe |
| Thorny Zamia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks | Toxic to pets |
| Thoroughwax | Direct sun (at least 4-6 hours) | Every 5–7 days; allow top inch to partially dry between waterings | Pet-safe |
| Thouars Cycad | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Toxic to pets |
| Threadleaf Coreopsis | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Three-Colored Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce to every 10–14 days in winter | Pet-safe |
| Three-Coloured Vanda | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days when cool and dim | Pet-safe |
| Three-lobed Coneflower | Direct sun (at least 4-6 hours) | When the top 3–4 cm of soil is dry; roughly weekly in the growing season, more during drought | Mildly toxic to pets |
| Three-Nerved Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to dry between waterings) | Pet-safe |
| Three-yoked Sage | Direct sun (at least 4-6 hours) | Low — every 10–14 days during active growth; minimal in winter | Mildly toxic to pets |
| Thrift | Direct sun (at least 4-6 hours) | Every 7–14 days, allowing soil to dry between waterings | Pet-safe |
| Thunberg Spirea | Direct sun (at least 4-6 hours) | Weekly until established; occasional deep watering thereafter | Pet-safe |
| Thunberg's astilbe | Medium indirect light (a couple of metres from a window) | Regular — every 2–3 days in warm weather; reduce in cool, overcast periods | Pet-safe |
| Thunberg's Cycad | Direct sun (at least 4-6 hours) | Every 14–21 days; drought-tolerant once established | Toxic to pets |
| Thunbergia battiscombei | Direct sun (at least 4-6 hours) | When the top few cm of soil dry out, about every 5-7 days in summer | Mildly toxic to pets |
| Thyrse Ginger Lily | Medium indirect light (a couple of metres from a window) | Consistently moist through growing season; reduced in dormancy | Mildly toxic to pets |
| Tian Shan Everlasting | Direct sun (at least 4-6 hours) | Every 2–3 weeks; less in winter | Mildly toxic to pets |
| Tibetan whitebeam | Direct sun (at least 4-6 hours) | Weekly during establishment; low once mature | Mildly toxic to pets |
| Tidal Wave silver petunia | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 7–10 days in garden beds | Pet-safe |
| Tiger Aloe | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in active growth, sparingly in summer dormancy and winter | Toxic to pets |
| Tiger Crow Orchid | Bright indirect light (just back from a sunny window) | When the bark mix is nearly dry, roughly every 5-7 days in growth | Pet-safe |
| Tiger Flower | Direct sun (at least 4-6 hours) | Regular watering during the growing season; reduce after flowering; dry storage in winter | Mildly toxic to pets |
| Tiger Jaws | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring-autumn; roughly monthly or less in winter | Mildly toxic to pets |
| Tiger Lily | Direct sun (at least 4-6 hours) | When top 3 cm of soil is dry | Toxic to pets |
| Tiger Tooth Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer, monthly in winter | Toxic to pets |
| Tilia cordata | Direct sun (at least 4-6 hours) | Water young trees deeply every 7-14 days in dry spells for the first two seasons; established trees are largely self-sufficient | Pet-safe |
| Tilia tomentosa 'Petiolaris' | Direct sun (at least 4-6 hours) | Deep watering every 7-14 days during dry weather for the first two or three seasons; established trees seldom need it | Pet-safe |
| Tillandsia bergeri | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly; mist between soaks in dry air | Pet-safe |
| Tillandsia caput-medusae | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes every 1-2 weeks; mist between soaks | Pet-safe |
| Tillandsia Streptophylla | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes every 1-2 weeks; mist sparingly between soaks | Pet-safe |
| Tillandsia tectorum | Bright indirect light (just back from a sunny window) | Mist lightly every 10-14 days; soak only rarely | Pet-safe |
| Tillandsia xerographica | Bright indirect light (just back from a sunny window) | Soak for 20-30 minutes every 10-14 days, more often in dry heat | Pet-safe |
| Tiny Dunce Cap | Direct sun (at least 4-6 hours) | Every 1–2 weeks during active growth; very sparingly in winter dormancy | Pet-safe |
| Tiny Sea Lavender | Direct sun (at least 4-6 hours) | Low — water sparingly, allowing soil to dry completely between sessions | Pet-safe |
| Tiny-calyx Columnea | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Tiramisu Heuchera | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 2-3 cm is dry, roughly every 5-7 days in summer | Pet-safe |
| Titanopsis Hugo-Schlechteri | Direct sun (at least 4-6 hours) | Mainly in autumn through spring, every 2-3 weeks when the soil is fully dry; sparing in hot summer | Mildly toxic to pets |
| Toffee Twist Sedge | Direct sun (at least 4-6 hours) | Keep evenly moist; water once or twice weekly in heat, less when cool | Mildly toxic to pets |
| Tojen Toad Lily | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, roughly once or twice a week in summer | Mildly toxic to pets |
| Tokudama Flavocircinalis Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil begins to dry, about every 5-7 days during active growth | Toxic to pets |
| Tom Thumb Cactus | Bright indirect light (just back from a sunny window) | Every 10-14 days in spring/summer; every 3-4 weeks in autumn; once or twice in winter | Mildly toxic to pets |
| Tomaselli's Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; every 5–8 weeks or less in winter | Toxic to pets |
| Tommies Crocus | Bright indirect light (just back from a sunny window) | No supplemental watering needed once established; relies on winter and spring rainfall | Mildly toxic to pets |
| Tompa Norway Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days when establishing; deep watering as the top few cm of soil dry | Pet-safe |
| Tongue Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of medium is dry, roughly every 7-10 days | Pet-safe |
| Tongue Leaf Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn and spring; very sparingly in summer and winter | Mildly toxic to pets |
| Toothed Fly Bush | Direct sun (at least 4-6 hours) | Keep substrate evenly moist; water every 2–4 days with pure water only | Pet-safe |
| Toothpick plant | Direct sun (at least 4-6 hours) | Every 6–9 days; drought-tolerant when established | Mildly toxic to pets |
| Topeka Purple Coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once mature (every 3–4 weeks in dry spells) | Pet-safe |
| Topsy Turvy Echeveria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Torch Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Torch Mexican sunflower | Direct sun (at least 4-6 hours) | Weekly until established; every 10–14 days once mature; drought-tolerant | Mildly toxic to pets |
| Torenia fournieri | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, often every 2-4 days in summer | Mildly toxic to pets |
| Torenia fournieri 'Catalina Midnight Blue' | Bright indirect light (just back from a sunny window) | Keep consistently moist; water every 2-4 days, more in heat | Mildly toxic to pets |
| Torenia fournieri 'Summer Wave Large Violet' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water every 2-4 days, daily for baskets in heat | Mildly toxic to pets |
| Totara | Direct sun (at least 4-6 hours) | When the topsoil dries, weekly while establishing then as needed | Toxic to pets |
| Totem Pole Cactus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 2-3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Trachelospermum asiaticum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days while establishing | Pet-safe |
| Trachelospermum jasminoides 'Variegatum' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days in growth | Pet-safe |
| Tradescantia Navicularis | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days | Toxic to pets |
| Tradescantia Sillamontana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Trailing Achimenes | Bright indirect light (just back from a sunny window) | Consistently moist but never waterlogged during the growing season; completely dry in winter dormancy | Pet-safe |
| Trailing African daisy | Direct sun (at least 4-6 hours) | Once or twice a week during active growth; reduce to once a week or less once established | Pet-safe |
| Trailing Azalea | Direct sun (at least 4-6 hours) | Moderate; water during dry spells in the growing season but ensure rapid drainage. | Toxic to pets |
| Trailing Elephant Bush | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 2–3 weeks in winter | Pet-safe |
| Trailing globe amaranth | Direct sun (at least 4-6 hours) | Every 5–7 days; quite drought-tolerant | Pet-safe |
| Trailing Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks (allow soil to dry completely between waterings) | Pet-safe |
| Trailing Iceplant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; minimal in winter | Mildly toxic to pets |
| Trailing Jade Peperomia | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring/summer; less in winter | Pet-safe |
| Trailing Lantana | Direct sun (at least 4-6 hours) | Every 1–2 weeks (drought-tolerant when established) | Toxic to pets |
| Transparent Tall Moor Grass | Bright indirect light (just back from a sunny window) | Weekly during establishment; less once settled | Pet-safe |
| Transparent-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to dry between waterings) | Pet-safe |
| Transylvanian Hepatica | Medium indirect light (a couple of metres from a window) | Every 5–7 days in spring and autumn; every 10–14 days in summer | Mildly toxic to pets |
| Transylvanian Pink | Direct sun (at least 4-6 hours) | Infrequent; allow soil to dry well between waterings | Mildly toxic to pets |
| Treasure flower | Direct sun (at least 4-6 hours) | Every 10–14 days once established; weekly when young | Mildly toxic to pets |
| Tree heath | Direct sun (at least 4-6 hours) | Fortnightly during the first growing season; drought-tolerant once established | Pet-safe |
| Tree Kopsia | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth, every 10-14 days in winter | Toxic to pets |
| Tree Peony | Direct sun (at least 4-6 hours) | Deeply every 7-10 days in the first two years and during dry spells; established shrubs are drought-tolerant | Toxic to pets |
| Tree rhododendron | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; monthly in winter | Toxic to pets |
| Tremula Pteris Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of mix is dry, roughly every 4-6 days | Pet-safe |
| Trevi Fountain Pulmonaria | Low light (north window or shaded room) | Keep soil evenly moist; water every 4-6 days in dry weather, more in containers | Mildly toxic to pets |
| Triangle palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Triangular Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in spring and autumn | Pet-safe |
| Tropical Almond | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top few cm dry, roughly every 5-7 days in heat | Mildly toxic to pets |
| Tropical pitcher plant | Bright indirect light (just back from a sunny window) | Keep the compost damp at all times, never bone-dry; in practice water with pure water every 2-4 days depending on warmth | Pet-safe |
| Tropical Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep media constantly moist; water every 2-4 days with mineral-free water | Pet-safe |
| Tropical Sage | Medium indirect light (a couple of metres from a window) | Regular while establishing; reduced once established | Pet-safe |
| Truncate Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Tsusima Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, roughly every 5-7 days | Pet-safe |
| Tube Beardtongue | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Mildly toxic to pets |
| Tuberous Catmint | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal watering in winter dormancy | Pet-safe |
| Tufted Fescue | Direct sun (at least 4-6 hours) | Every 10–14 days when established; more frequently for newly planted specimens | Pet-safe |
| Tufted Hair Grass | Bright indirect light (just back from a sunny window) | Keep soil consistently moist, watering deeply 1-2 times weekly in dry spells | Mildly toxic to pets |
| Tufted Loosestrife | Medium indirect light (a couple of metres from a window) | Permanently wet to shallow aquatic; bog garden or shallow pond margin | Pet-safe |
| Tufted Vetch | Direct sun (at least 4-6 hours) | Low to moderate — tolerates periodic dry spells once established | Mildly toxic to pets |
| Tulista Marginata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 2-3 weeks in growth; monthly in winter | Pet-safe |
| Tulista Pumila | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-3 weeks in growth; monthly in winter | Pet-safe |
| Tunic Flower | Direct sun (at least 4-6 hours) | Low; water sparingly and only when the top 2–3 cm of soil is fully dry | Mildly toxic to pets |
| Turbinicarpus pseudomacrochele | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2 weeks; none in winter | Pet-safe |
| Turbinicarpus schmiedickeanus | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; none in winter | Pet-safe |
| Turbinicarpus valdezianus | Direct sun (at least 4-6 hours) | Very sparingly when fully dry in the growing season, roughly every 2-3 weeks; none in winter | Pet-safe |
| Turbo Peperomia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in terrariums; every 10–14 days in open pots | Pet-safe |
| Turkestan Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; sparingly in autumn; almost none in winter | Pet-safe |
| Turkestan Tulip | Direct sun (at least 4-6 hours) | Minimal; water once at planting; rely on natural rainfall during growth; completely dry during summer dormancy | Toxic to pets |
| Turkey Oak | Direct sun (at least 4-6 hours) | Occasional once established; more frequent in first 2–3 years | Mildly toxic to pets |
| Turkish Catmint | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; very sparingly in winter | Pet-safe |
| Turkish Pink Sage | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter | Mildly toxic to pets |
| Turkish Red Sage | Bright indirect light (just back from a sunny window) | Allow to dry between waterings | Pet-safe |
| Turkish Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Pet-safe |
| Turkish White Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; minimal once dormant in summer heat | Pet-safe |
| Turquoise Puya | Direct sun (at least 4-6 hours) | weekly in summer, monthly in winter | Pet-safe |
| Twinkle Oncidium | Bright indirect light (just back from a sunny window) | When the top of the mix begins to dry, about every 4-6 days | Pet-safe |
| Twinleaf | Medium indirect light (a couple of metres from a window) | 2 times per week during spring growth; reduce through summer | Mildly toxic to pets |
| Twinspur | Direct sun (at least 4-6 hours) | 2–3 times per week during active growth; reduce during cooler periods | Pet-safe |
| Twisted Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; monthly in winter | Mildly toxic to pets |
| Twisted Barrel Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Twisted Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; maintain light but consistent moisture | Pet-safe |
| Two-Color Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in the winter rest | Pet-safe |
| Two-Colour Vygie | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; monthly or less in winter | Mildly toxic to pets |
| Two-edged Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days in warm months; every 2–3 days in winter | Pet-safe |
| Two-Flowered Everlasting Pea | Direct sun (at least 4-6 hours) | Every 7–10 days during dry spells; rarely needs watering once established | Mildly toxic to pets |
| Two-Ranked Aechmea | Bright indirect light (just back from a sunny window) | Refresh central cup every 7–10 days; water soil every 2–3 weeks | Pet-safe |
| Two-Row Stonecrop | Direct sun (at least 4-6 hours) | Every 10-14 days until established; essentially rain-fed once rooted | Pet-safe |
| Two-Spiked Billbergia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); cup refreshed every 2–4 weeks | Pet-safe |
| Umbel Sun Rose | Direct sun (at least 4-6 hours) | Very low — minimal irrigation needed; drought-tolerant once established | Mildly toxic to pets |
| Umbrella Bamboo | Medium indirect light (a couple of metres from a window) | Twice weekly during establishment; every 5–7 days in summer once established | Pet-safe |
| Umbrella Magnolia | Medium indirect light (a couple of metres from a window) | Weekly during dry spells; keep soil evenly moist but not waterlogged | Pet-safe |
| Umbrella Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Unequal-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10-14 days in the growing season; less in winter | Pet-safe |
| Unequal-leaf Primulina | Bright indirect light (just back from a sunny window) | Every 10–14 days during active growth; every 3–4 weeks in winter | Mildly toxic to pets |
| Upright European Hornbeam | Direct sun (at least 4-6 hours) | Moderate; water regularly for first 2–3 seasons; rainfall-dependent once established | Pet-safe |
| Upright Nidularium | Bright indirect light (just back from a sunny window) | Weekly during growing season; reduce in winter | Pet-safe |
| Upright Prairie Coneflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very drought-tolerant | Pet-safe |
| Uproar Rose zinnia | Direct sun (at least 4-6 hours) | Regular; deep watering 2–3 times per week at soil level | Pet-safe |
| Urmia Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| Ursula's Red Painted Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season, reduce in winter | Pet-safe |
| Uvaia | Direct sun (at least 4-6 hours) | Weekly; keep consistently moist during establishment, more drought-tolerant once mature | Pet-safe |
| Valais fescue | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; more frequent only during establishment | Pet-safe |
| Valentine Bleeding Heart | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water every 4-6 days in spring, easing off as it goes dormant | Toxic to pets |
| Valentine's Crown Vetch | Direct sun (at least 4-6 hours) | Low to moderate — once every 2–3 weeks when established | Toxic to pets |
| Vanda 'Fuchs Delight' | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days when cool or low-light | Pet-safe |
| Vanda 'Miss Joaquim' | Direct sun (at least 4-6 hours) | Daily in warm, bright conditions; every 2-3 days if cooler | Pet-safe |
| Vanda 'Robert's Delight' | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days in cool or dormant spells | Pet-safe |
| Vandeleur's Cape Primrose | Bright indirect light (just back from a sunny window) | Every 10–14 days; allow compost to dry slightly between waterings | Pet-safe |
| Vanilla Trumpet Vine | Direct sun (at least 4-6 hours) | Twice weekly during summer; weekly or less in winter | Mildly toxic to pets |
| Variable Dancing Ginger | Medium indirect light (a couple of metres from a window) | 2–3 times per week during active growth; once every 2–3 weeks during dormancy | Mildly toxic to pets |
| Variable Epidendrum | Bright indirect light (just back from a sunny window) | Every 4–7 days during growth; every 10–12 days in cooler months | Pet-safe |
| Variable Zamia | Bright indirect light (just back from a sunny window) | Every 10–14 days in growing season; every 3–5 weeks in winter | Toxic to pets |
| Varied-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established; more frequently in the first season | Mildly toxic to pets |
| Variegata Brunnera | Low light (north window or shaded room) | Keep soil reliably moist; water when the top 2-3 cm dries, roughly every 4-6 days in warm spells | Mildly toxic to pets |
| Variegated Basket Grass | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Variegated Bear's Paw | Bright indirect light (just back from a sunny window) | Every 3–4 weeks, or when soil is completely dry | Toxic to pets |
| Variegated Cast Iron Plant | Low light (north window or shaded room) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Variegated Dwarf Schefflera | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Variegated Elephant Bush | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in summer, monthly in winter | Pet-safe |
| Variegated Greater Periwinkle | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce to every 10–14 days in cooler months | Toxic to pets |
| Variegated Greater Pond Sedge | Bright indirect light (just back from a sunny window) | Keep consistently wet — tolerates standing water | Pet-safe |
| Variegated Japanese Spurge | Medium indirect light (a couple of metres from a window) | Every 5–7 days during establishment; once established, water during dry spells | Mildly toxic to pets |
| Variegated Lilyturf | Medium indirect light (a couple of metres from a window) | Weekly during establishment; established plants are drought-tolerant, needing water only during prolonged summer drought | Mildly toxic to pets |
| Variegated Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days from late autumn through spring when leaves are present; withhold completely in summer dormancy | Pet-safe |
| Variegated Moon Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth; minimal in winter | Pet-safe |
| Variegated pieris | Bright indirect light (just back from a sunny window) | Weekly; do not allow soil to dry out | Toxic to pets |
| Variegated Purple Moor Grass | Bright indirect light (just back from a sunny window) | Regular; keep soil consistently moist | Pet-safe |
| Variegated Purple Moor Grass | Bright indirect light (just back from a sunny window) | Weekly during growing season; keep consistently moist | Pet-safe |
| variegated silver grass | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in autumn and winter | Pet-safe |
| Variegated Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; drought-tolerant once established | Toxic to pets |
| Variegated String of Hearts | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days | Pet-safe |
| Variegated String of Pearls | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Variegated Sweetheart Hoya | Bright indirect light (just back from a sunny window) | When the mix is almost fully dry, every 2-3 weeks | Pet-safe |
| Variegated Yellow Sedge | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water every 5-7 days in dry spells and never let containers dry out | Mildly toxic to pets |
| Vasse's Staghorn Fern | Bright indirect light (just back from a sunny window) | Weekly soaking in the growing season; fortnightly in cooler months | Pet-safe |
| Veilchenblau Rose | Bright indirect light (just back from a sunny window) | Deeply once or twice weekly while establishing; mature plants when the top few centimetres of soil dry, and they tolerate some drought | Pet-safe |
| Vein-leaved Zamia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow top 3–5 cm to dry) | Toxic to pets |
| Veitch Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Pet-safe |
| Veldt Cyanotis | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer; every 10–14 days in winter | Mildly toxic to pets |
| Velvet Ash | Direct sun (at least 4-6 hours) | Low once established; deep watering every 2–4 weeks in summer heat | Pet-safe |
| Velvet bean | Direct sun (at least 4-6 hours) | Water regularly to keep soil moist, roughly every 4–7 days; tolerates brief dry spells once established | Mildly toxic to pets |
| Velvet Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season, every 3–4 weeks in winter | Toxic to pets |
| Velvet Leaf Vine | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 14–21 days in winter | Toxic to pets |
| Velvet Queen sunflower | Direct sun (at least 4-6 hours) | Weekly, more often in hot dry spells | Pet-safe |
| Venus Maidenhair Fern | Bright indirect light (just back from a sunny window) | Keep constantly moist, often every 2-3 days | Pet-safe |
| Verbena × hybrida 'Superbena Stormburst' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 2-4 days in summer | Mildly toxic to pets |
| Verity's Liveforever | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (October–April); completely dry June–September | Pet-safe |
| Veronica beccabunga | Direct sun (at least 4-6 hours) | Keep permanently wet; never let the rootzone dry out | Mildly toxic to pets |
| Veronica longifolia 'Blauriesin' | Direct sun (at least 4-6 hours) | When the top few centimetres of soil are drying, about weekly in summer | Mildly toxic to pets |
| Veronica spicata 'Royal Candles' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly weekly in the first season | Mildly toxic to pets |
| Veronica spicata subsp. incana | Direct sun (at least 4-6 hours) | Every 10-14 days once established, when soil is dry | Mildly toxic to pets |
| Veronicastrum virginicum | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water deeply in dry spells | Mildly toxic to pets |
| Veronicastrum virginicum 'Fascination' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Mildly toxic to pets |
| Victoria Lady Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; reduce in winter | Pet-safe |
| Vidal's Lady Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; reduce in winter | Pet-safe |
| Vilmorin's rowan | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Mildly toxic to pets |
| Vining Peperomia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring/summer; every 2–3 weeks in winter | Pet-safe |
| Viola 'Sorbet Raspberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 3-5 days; containers more often | Pet-safe |
| Viola cornuta 'Etain' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, generally every 3-5 days; more in containers and heat | Pet-safe |
| Violet petunia | Direct sun (at least 4-6 hours) | Every 7–10 days in borders; containers may need more frequent watering | Pet-safe |
| Violet Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Viper's Bugloss | Direct sun (at least 4-6 hours) | Infrequent once established; drought-tolerant | Mildly toxic to pets |
| Virgin Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in autumn–winter rest | Pet-safe |
| Virginia Pine Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, frequently daily in summer and every few days in cooler months | Pet-safe |
| Vitis coignetiae | Direct sun (at least 4-6 hours) | Water young vines in dry spells; established plants are largely self-sufficient | Toxic to pets |
| Vivellii winter heath | Direct sun (at least 4-6 hours) | Weekly for new plantings; every 2–3 weeks for established plants during dry periods | Pet-safe |
| Volcanic Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Vriesea 'Poelmanii' | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Vriesea carinata | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Vriesea fosteriana | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Vriesea hieroglyphica | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Vriesea platynema | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Wagner's Sage | Bright indirect light (just back from a sunny window) | Water regularly to maintain consistent moisture | Pet-safe |
| Waldbrunn Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing; deep watering when the top 5 cm of soil dries | Pet-safe |
| Walker's Low Catmint | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly every 7-10 days while establishing, then rarely | Mildly toxic to pets |
| Walker's Low Catmint | Direct sun (at least 4-6 hours) | Every 7–14 days once established | Pet-safe |
| Wall Rue | Bright indirect light (just back from a sunny window) | Rarely needs watering in the ground; water container plants only when the crevice substrate dries | Pet-safe |
| Wall-rue Spleenwort | Medium indirect light (a couple of metres from a window) | Sparingly — only when the substrate is dry to the touch | Mildly toxic to pets |
| Wallich's Cranesbill | Bright indirect light (just back from a sunny window) | Once or twice weekly during dry spells once established | Pet-safe |
| Wallichiana Fern | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil begins to dry, about every 5-7 days | Mildly toxic to pets |
| Wallis Fescue | Direct sun (at least 4-6 hours) | Every 14–21 days when established; minimal in winter | Pet-safe |
| Wallis's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Every 2–3 days; medium kept continuously moist | Pet-safe |
| Wampee | Direct sun (at least 4-6 hours) | Water deeply every 5-10 days; keep evenly moist when fruiting | Mildly toxic to pets |
| Wandering Orthophytum | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; every 14 days in winter | Pet-safe |
| Waras' Parodia | Bright indirect light (just back from a sunny window) | Every 10-14 days in spring/summer; every 3-4 weeks in autumn; once in winter or withheld entirely | Mildly toxic to pets |
| Warneckii Dracaena | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Warty Gasteria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Pet-safe |
| Water Forget-me-not | Bright indirect light (just back from a sunny window) | Permanently moist to marginal aquatic; up to 10 cm over crown | Mildly toxic to pets |
| Waterberg Cycad | Direct sun (at least 4-6 hours) | Every 3–5 weeks | Toxic to pets |
| Watercress Fern | Medium indirect light (a couple of metres from a window) | When the surface starts to dry, roughly every 3-5 days | Mildly toxic to pets |
| Watermelon Begonia | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Watermelon Peperomia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-14 days in summer and every 2-3 weeks in winter | Pet-safe |
| Wave Petunia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in baskets and hot weather | Pet-safe |
| wavy hair grass | Bright indirect light (just back from a sunny window) | Water every 1-2 weeks; drought-tolerant once established in cool climates | Mildly toxic to pets |
| Wavy-margin Primulina | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in autumn and winter | Mildly toxic to pets |
| Wavyleaf Coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment (first season); monthly or rainfall-dependent once mature | Pet-safe |
| Wax Jambu | Direct sun (at least 4-6 hours) | Regular deep watering every 4-7 days; more during fruiting and dry heat | Mildly toxic to pets |
| Wax plant | Bright indirect light (just back from a sunny window) | When the soil is dry, every 10-14 days | Pet-safe |
| wayfaring tree | Direct sun (at least 4-6 hours) | Weekly when young; rarely needed once established | Mildly toxic to pets |
| Webb's Germander | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry between waterings | Mildly toxic to pets |
| Weeping Blue Atlas Cedar | Direct sun (at least 4-6 hours) | Every 1-2 weeks while young, then only in drought | Mildly toxic to pets |
| Weeping Blue Atlas Cedar | Direct sun (at least 4-6 hours) | Weekly during establishment (2–3 years); then rainfall-dependent | Mildly toxic to pets |
| Weeping Brown Sedge | Bright indirect light (just back from a sunny window) | Weekly or when the top 3 cm of soil is dry | Pet-safe |
| Weeping Eastern Hemlock | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks; more in hot or dry conditions | Pet-safe |
| Weeping European Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; less once established | Pet-safe |
| Weeping fig | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Weeping Fig Variegata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| weeping forsythia | Direct sun (at least 4-6 hours) | Weekly during first growing season; established plants need watering only during prolonged drought | Mildly toxic to pets |
| Weeping Giant Sequoia | Direct sun (at least 4-6 hours) | Every 1–2 weeks when young; monthly once established in moist climates | Pet-safe |
| Weeping Love Grass | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; weekly during establishment | Pet-safe |
| Weeping Norway Spruce | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water weekly in dry spells, more for young trees | Mildly toxic to pets |
| Weeping silver pear | Direct sun (at least 4-6 hours) | Weekly when establishing; monthly once established | Mildly toxic to pets |
| Weeping White Mulberry | Direct sun (at least 4-6 hours) | Weekly for first two years; monthly once established in temperate climates | Mildly toxic to pets |
| Weigela 'Bristol Ruby' | Direct sun (at least 4-6 hours) | Weekly while establishing; established shrubs need water mainly in dry spells | Mildly toxic to pets |
| Weilbach's Aechmea | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); refresh central tank every 3–4 weeks | Pet-safe |
| Welwitsch's Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks; minimal in winter | Mildly toxic to pets |
| Wendland's Bulbophyllum | Medium indirect light (a couple of metres from a window) | Regularly throughout the year; keep medium consistently moist in summer, slightly drier in winter | Pet-safe |
| Wendland's Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; never dry out | Pet-safe |
| West Texas Sage | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Western Arborvitae Zebrina | Direct sun (at least 4-6 hours) | Deeply every 5-7 days the first two years, then during dry spells | Mildly toxic to pets |
| Western Hemlock | Medium indirect light (a couple of metres from a window) | Weekly during establishment; regular moisture long-term | Pet-safe |
| Western Ironweed | Direct sun (at least 4-6 hours) | Low to moderate — drought-tolerant once established | Mildly toxic to pets |
| Western Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; thereafter relies on natural precipitation | Pet-safe |
| Western Maidenhair Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days | Pet-safe |
| Western Red Cedar | Direct sun (at least 4-6 hours) | Regular — water deeply once or twice a week until established; drought-sensitive | Pet-safe |
| Western Skunk Cabbage | Medium indirect light (a couple of metres from a window) | Permanently moist to wet; boggy or waterlogged conditions required | Toxic to pets |
| Western Sundew | Direct sun (at least 4-6 hours) | Shallow tray method in winter–spring; dry in summer | Mildly toxic to pets |
| Western Sunflower | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; extremely drought-tolerant | Pet-safe |
| Western Sword Fern | Low light (north window or shaded room) | When the top 3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Western White Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist spring through early summer; reduced but not completely dry in summer dormancy. | Mildly toxic to pets |
| Whale Fin Snake Plant | Bright indirect light (just back from a sunny window) | every 2-4 weeks, when soil is fully dry | Toxic to pets |
| Wheel Cactus | Direct sun (at least 4-6 hours) | Every 2-4 weeks during spring/summer growing season; once every 6 weeks in autumn; sparingly or not at all in winter | Mildly toxic to pets |
| Wheeler's Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Whip Brassavola | Bright indirect light (just back from a sunny window) | Every 3–5 days in summer; every 7–10 days in winter | Pet-safe |
| White Arrow Arum | Bright indirect light (just back from a sunny window) | Continuously moist to waterlogged; never allow to dry out | Toxic to pets |
| White Ash | Direct sun (at least 4-6 hours) | Moderate; water weekly when young; moderate drought tolerance once established | Mildly toxic to pets |
| White Baneberry | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; weekly when dormant | Toxic to pets |
| White Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal in winter | Pet-safe |
| White Campion | Bright indirect light (just back from a sunny window) | Low to moderate; allow soil to approach dryness between waterings | Mildly toxic to pets |
| White Dendrobium | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; every 2–3 weeks in winter rest | Pet-safe |
| White dipladenia | Direct sun (at least 4-6 hours) | Every 5–7 days during active growth; reduce to every 10–14 days in winter. | Mildly toxic to pets |
| White Fir | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; largely drought-tolerant once mature | Pet-safe |
| White Floss Silk Tree | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 3–4 weeks in winter | Mildly toxic to pets |
| White Frangipani | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; once per month or less in winter | Toxic to pets |
| White Freesia | Direct sun (at least 4-6 hours) | Moderate during active growth (autumn to spring); completely dry during summer dormancy | Pet-safe |
| White Gardenia | Bright indirect light (just back from a sunny window) | Every 7–10 days during growing season; every 14–21 days in winter | Mildly toxic to pets |
| White Ginger Lily | Bright indirect light (just back from a sunny window) | Water generously every 2–4 days in active growth; reduce to sparingly in winter dormancy | Mildly toxic to pets |
| White Ixora | Direct sun (at least 4-6 hours) | 2-3 times per week in summer, weekly in winter | Mildly toxic to pets |
| White Juttadinteria | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (spring through autumn); very sparingly in winter | Mildly toxic to pets |
| White laceflower | Direct sun (at least 4-6 hours) | Every 5–7 days; allow the top 2 cm of soil to dry between waterings | Pet-safe |
| White Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and autumn; once every 2–3 weeks in summer dry rest | Pet-safe |
| White mountain heather | Direct sun (at least 4-6 hours) | Consistently moist during the growing season; reduce in winter | Pet-safe |
| White Mugwort | Medium indirect light (a couple of metres from a window) | Weekly or when top 2–3 cm of soil dries | Mildly toxic to pets |
| White Mussaenda | Direct sun (at least 4-6 hours) | Every 2–3 days during active growth; reduce in cooler months | Mildly toxic to pets |
| White Perfection Darley Dale heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| White Periwinkle | Medium indirect light (a couple of metres from a window) | Weekly during establishment; self-sufficient in average rainfall once established | Toxic to pets |
| White Prairie Clover | Direct sun (at least 4-6 hours) | Water to establish; afterwards highly drought-tolerant, seldom needs watering | Mildly toxic to pets |
| White Sails | Medium indirect light (a couple of metres from a window) | Every 7–10 days during active growth; reduce to every 14 days in winter | Toxic to pets |
| White Sapote | Direct sun (at least 4-6 hours) | Weekly for young trees; every 2–3 weeks for established trees; withhold during wet periods | Toxic to pets |
| White Spruce | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; regular watering for first 2 years | Mildly toxic to pets |
| White St Dabeoc's Heath | Bright indirect light (just back from a sunny window) | Moderate — water when top 2–3 cm of soil is dry | Mildly toxic to pets |
| White Stonecrop | Direct sun (at least 4-6 hours) | When soil is dry, roughly every 10-14 days in summer; little to none in winter | Pet-safe |
| White Tabernaemontana | Bright indirect light (just back from a sunny window) | Twice weekly during active growth; once per week or less in winter | Toxic to pets |
| White Tiger Jaws | Direct sun (at least 4-6 hours) | Every 14–21 days during the growing season (spring–autumn); once monthly or less in winter | Mildly toxic to pets |
| White Trout Lily | Medium indirect light (a couple of metres from a window) | Keep consistently moist while in growth (spring); reduce after dormancy | Mildly toxic to pets |
| White Wild Indigo | Direct sun (at least 4-6 hours) | Water the first season; established plants need little to no watering | Mildly toxic to pets |
| White Wild Quinine | Direct sun (at least 4-6 hours) | Water to establish, then sparingly; drought-tolerant once rooted | Mildly toxic to pets |
| White Young's Barrenwort | Medium indirect light (a couple of metres from a window) | Water weekly, or when the top 2 cm of soil dries, particularly during establishment; reduce frequency once settled | Mildly toxic to pets |
| White-Bark Magnolia | Bright indirect light (just back from a sunny window) | Weekly during dry spells for the first 3 years; every 2 weeks when established | Pet-safe |
| White-flowered Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal in winter | Mildly toxic to pets |
| White-haired Crown Cactus | Direct sun (at least 4-6 hours) | Weekly in summer; every 10–14 days in spring and autumn; once a month or none in winter | Pet-safe |
| White-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; reduce to monthly or less in winter | Pet-safe |
| White-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Occasional — every 2–3 weeks when established; weekly in the first season | Mildly toxic to pets |
| White-Powder Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; fortnightly when dormant | Pet-safe |
| Whitley's Speedwell | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; minimal in winter | Pet-safe |
| Whorled Heath | Direct sun (at least 4-6 hours) | Infrequent once established; drought-tolerant | Mildly toxic to pets |
| Whorled Milkweed | Direct sun (at least 4-6 hours) | Water to establish, then rarely; highly drought-tolerant once settled | Toxic to pets |
| Whorled Rosinweed | Bright indirect light (just back from a sunny window) | Every 1-2 weeks once established | Pet-safe |
| Whorled Solomon's Seal | Medium indirect light (a couple of metres from a window) | Every 5–7 days during the growing season; reduce in autumn | Mildly toxic to pets |
| Wickwar Flame heather | Direct sun (at least 4-6 hours) | Weekly during establishment, then as needed | Pet-safe |
| Wide Brim Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, roughly every 5-7 days during active growth | Toxic to pets |
| Wide Eye Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn to late winter; none in summer | Pet-safe |
| Wide-leaf Ceratozamia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks | Toxic to pets |
| Wide-Leaved Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Pet-safe |
| Wild Blue Phlox | Medium indirect light (a couple of metres from a window) | Weekly; keep soil evenly moist | Mildly toxic to pets |
| Wild Cardamom | Medium indirect light (a couple of metres from a window) | Regularly throughout the growing season; reduce in winter | Mildly toxic to pets |
| Wild Cherry Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil begins to dry, often daily in summer | Toxic to pets |
| Wild Crabapple Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, often daily in summer and much less in winter dormancy | Toxic to pets |
| Wild Custard Apple | Direct sun (at least 4-6 hours) | Weekly during the growing season; monthly during dry dormancy | Mildly toxic to pets |
| Wild Gazania | Direct sun (at least 4-6 hours) | Every 10–14 days (very drought-tolerant once established) | Mildly toxic to pets |
| Wild Lupine | Direct sun (at least 4-6 hours) | Water to establish, then rarely; it is drought-tolerant once settled | Toxic to pets |
| Wild maracuja | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Mildly toxic to pets |
| Wild nemesia | Direct sun (at least 4-6 hours) | Every 7–14 days once established; more frequently when young | Pet-safe |
| Wild Pineapple | Direct sun (at least 4-6 hours) | Every 7–14 days; very drought-tolerant once established | Mildly toxic to pets |
| Wild Quinine | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Wild Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then rarely once mature | Pet-safe |
| Wild Star Apple | Direct sun (at least 4-6 hours) | Every 7–10 days when young; drought-tolerant once established | Mildly toxic to pets |
| Wild Teasel | Bright indirect light (just back from a sunny window) | Regular during establishment; tolerates winter wet | Mildly toxic to pets |
| Wildeve Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while growing, increasing in heat and on free-draining soils | Pet-safe |
| Wildfire Black Tupelo | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Mildly toxic to pets |
| William Shakespeare 2000 Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | Pet-safe |
| Wilmot's Dinteranthus | Direct sun (at least 4-6 hours) | Autumn only (2 watering cycles); stop completely in spring while new leaves emerge; minimal in early winter | Pet-safe |
| Wilson Spruce | Direct sun (at least 4-6 hours) | Weekly when young; established trees are drought-tolerant | Pet-safe |
| Wiltoni Juniper | Direct sun (at least 4-6 hours) | Every 7-10 days in year one, then rarely | Mildly toxic to pets |
| Window Plant | Direct sun (at least 4-6 hours) | Every 3–4 weeks in spring and summer; minimal in winter | Pet-safe |
| Wine Fishtail Palm | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Wine Palm | Direct sun (at least 4-6 hours) | Water deeply 1–2 times per week in warm weather, less frequently in cool periods | Toxic to pets |
| Winged Kacip Fatimah | Low light (north window or shaded room) | Water when the top 1–2 cm of medium begins to dry; approximately every 4–7 days depending on temperature and humidity | Mildly toxic to pets |
| Winged Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to dry almost fully between waterings) | Pet-safe |
| Winter Aconite | Medium indirect light (a couple of metres from a window) | Relies on natural rainfall; keep soil moist during active growth | Toxic to pets |
| Winter Glow Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–14 days during the growing season; very little in winter | Pet-safe |
| Winter Gold Mugo Pine | Direct sun (at least 4-6 hours) | Weekly for the first two seasons; established plants every 2-3 weeks in drought | Mildly toxic to pets |
| Winter heath | Direct sun (at least 4-6 hours) | Established plants: every 2–3 weeks in dry spells; new plants: weekly for the first season | Pet-safe |
| Winter Heath Springwood White | Direct sun (at least 4-6 hours) | Weekly during dry spells; drought-tolerant once established | Mildly toxic to pets |
| Winter Iris | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water sparingly in summer | Toxic to pets |
| Winterberry Holly 'Winter Red' | Direct sun (at least 4-6 hours) | Keep consistently moist; water regularly in dry spells | Toxic to pets |
| Wintergreen Boxwood | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, about weekly in summer | Toxic to pets |
| Wintersweet | Direct sun (at least 4-6 hours) | Water in dry spells; moderate once established | Mildly toxic to pets |
| Wire-stem Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn–spring); once per month or less in summer dormancy | Toxic to pets |
| Wisley 2008 Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season; more in heat or sandy soil | Pet-safe |
| Wisley Gaultheria | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; less in cool winters | Mildly toxic to pets |
| Wisley Pearl Gaultheria | Bright indirect light (just back from a sunny window) | Regularly; keep soil evenly moist | Toxic to pets |
| Wisteria 'Amethyst Falls' | Direct sun (at least 4-6 hours) | Weekly while establishing; water in summer drought | Toxic to pets |
| Wisteria floribunda | Direct sun (at least 4-6 hours) | Water deeply in dry spells, particularly through bud development; mature plants tolerate some drought | Toxic to pets |
| Wisteria floribunda 'Multijuga' | Direct sun (at least 4-6 hours) | Water deeply in dry weather, especially during flowering and bud set; established plants tolerate moderate drought | Toxic to pets |
| Wisteria sinensis | Direct sun (at least 4-6 hours) | Water deeply during dry spells, especially while flower buds form; established plants are fairly drought-tolerant | Toxic to pets |
| Wisteria sinensis 'Alba' | Direct sun (at least 4-6 hours) | Water deeply during dry spells, especially as buds form; established plants tolerate some drought | Toxic to pets |
| Witch Hazel | Bright indirect light (just back from a sunny window) | Keep evenly moist; water in dry spells | Mildly toxic to pets |
| Witchgrass | Direct sun (at least 4-6 hours) | Rainfall sufficient in most climates; supplemental water only if very dry | Pet-safe |
| Witteberg Cone Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn–winter; almost none in summer | Pet-safe |
| Wolf Eyes Kousa Dogwood | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 10–14 days once mature | Mildly toxic to pets |
| Wonderful Puya | Direct sun (at least 4-6 hours) | Weekly in summer, once every 2–3 weeks in winter | Mildly toxic to pets |
| Wonga Wonga Vine | Bright indirect light (just back from a sunny window) | Every 7–10 days when young; largely self-sufficient once established in ground | Mildly toxic to pets |
| Wood Avens | Medium indirect light (a couple of metres from a window) | Low to moderate — rain-fed in shade | Pet-safe |
| Wood Club-rush | Medium indirect light (a couple of metres from a window) | Permanently moist to wet; tolerates shallow standing water | Pet-safe |
| Wood Melick | Medium indirect light (a couple of metres from a window) | Infrequently; drought-tolerant under shade | Pet-safe |
| wood small-reed | Direct sun (at least 4-6 hours) | Drought-tolerant once established; occasional deep watering in first season | Pet-safe |
| Wood's Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days when actively growing, every 3–4 weeks in winter | Toxic to pets |
| Wood's Cycad | Bright indirect light (just back from a sunny window) | When the top 5 cm of mix is dry, roughly every 10-14 days in growth | Toxic to pets |
| Woodland Sage | Direct sun (at least 4-6 hours) | Low to moderate; drought tolerant once established | Pet-safe |
| Woodland Sunflower | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks; drought-tolerant once established | Pet-safe |
| Woodsia ilvensis | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days | Mildly toxic to pets |
| Woodwardia fimbriata | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist to wet; check every 2-4 days in growth | Mildly toxic to pets |
| Woodwardia unigemmata | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of soil begins to dry, roughly every 4-7 days in growth | Mildly toxic to pets |
| Woolly Jerusalem Sage | Direct sun (at least 4-6 hours) | Low — once every 2–3 weeks once established; minimal in winter | Mildly toxic to pets |
| Woolly Lip Fern | Direct sun (at least 4-6 hours) | every 2-4 weeks (highly drought-tolerant) | Mildly toxic to pets |
| Woolly Rose | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Woolly yarrow | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal supplemental watering needed | Mildly toxic to pets |
| Wooly-leaf White Sapote | Direct sun (at least 4-6 hours) | Water frequently when young; every 1–2 weeks once established; reduce after harvest | Toxic to pets |
| Worplesdon Sweetgum | Direct sun (at least 4-6 hours) | Weekly during the first 3 years; supplemental watering in dry summers | Mildly toxic to pets |
| Wrinkled Elatostema | Low light (north window or shaded room) | Every 3–5 days; soil should remain consistently moist | Pet-safe |
| Wulfen's Alyssum | Direct sun (at least 4-6 hours) | Every 14–21 days during growing season; very little in winter | Pet-safe |
| Wych Elm Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil begins to dry, often daily in summer | Mildly toxic to pets |
| Yakushima Rhododendron | Bright indirect light (just back from a sunny window) | Weekly during dry weather; do not allow to dry out in summer or before frost | Toxic to pets |
| Yakushima Rhododendron 'Yaku Princess' | Bright indirect light (just back from a sunny window) | About weekly, more during heat; water when the top 2-3 cm of soil is dry | Toxic to pets |
| Yarrow 'Moonshine' | Direct sun (at least 4-6 hours) | When the top few centimeters of soil are dry, roughly every 7-14 days | Mildly toxic to pets |
| Yellow Archangel | Medium indirect light (a couple of metres from a window) | Every 7–14 days; drought-tolerant once established in shade | Mildly toxic to pets |
| Yellow Azalea | Bright indirect light (just back from a sunny window) | Weekly during dry spells; established plants are reasonably drought-tolerant but flower best with consistent moisture | Toxic to pets |
| Yellow Baby Toes | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active growth (autumn through spring); essentially none through summer dormancy | Pet-safe |
| Yellow Barrenwort | Medium indirect light (a couple of metres from a window) | Weekly during first two seasons; established plants are drought-tolerant and rarely need supplemental watering | Mildly toxic to pets |
| Yellow Birch | Direct sun (at least 4-6 hours) | Consistently moist; water deeply 1-2 times per week during establishment and in dry spells | Pet-safe |
| Yellow Clintonia | Low light (north window or shaded room) | Twice weekly in dry spells; maintain even soil moisture throughout the growing season | Pet-safe |
| Yellow Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn; withhold entirely in summer | Pet-safe |
| Yellow coneflower | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; every 2–4 weeks once established | Pet-safe |
| Yellow Crocus | Direct sun (at least 4-6 hours) | Very low — water once at planting; rainfall sufficient during growth; completely dry in summer | Mildly toxic to pets |
| Yellow Dragon Fruit | Direct sun (at least 4-6 hours) | Every 10-14 days in growth; let the top half of the mix dry first | Pet-safe |
| Yellow Fairybells | Medium indirect light (a couple of metres from a window) | Regular; maintain consistent moisture | Mildly toxic to pets |
| Yellow Foxglove | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly weekly in dry spells | Toxic to pets |
| Yellow Giant Hyssop | Bright indirect light (just back from a sunny window) | Every 7–10 days during the growing season; minimal in winter | Pet-safe |
| Yellow Glacier Lily | Medium indirect light (a couple of metres from a window) | Regular during spring growth; reduce sharply after dormancy | Mildly toxic to pets |
| Yellow Groove Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; every 2 weeks when dormant | Pet-safe |
| Yellow Heron's Bill | Direct sun (at least 4-6 hours) | Water sparingly every 10-14 days in summer; keep almost completely dry from late autumn to early spring | Mildly toxic to pets |
| Yellow Horned Poppy | Direct sun (at least 4-6 hours) | Occasionally during dry spells only | Toxic to pets |
| Yellow Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; minimal to none in winter | Pet-safe |
| Yellow Jaboticaba | Direct sun (at least 4-6 hours) | Every 2–3 days during establishment; weekly once mature | Mildly toxic to pets |
| Yellow Latan Palm | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 14–21 days in winter | Pet-safe |
| Yellow Loosestrife | Medium indirect light (a couple of metres from a window) | Regularly, keeping soil consistently moist | Mildly toxic to pets |
| Yellow Mombin | Direct sun (at least 4-6 hours) | Every 7–14 days; highly drought-tolerant when established | Pet-safe |
| Yellow Monanthes | Bright indirect light (just back from a sunny window) | Sparingly; roughly every 2–3 weeks during active growth (autumn–spring), barely at all in summer | Mildly toxic to pets |
| Yellow Mountain Saxifrage | Direct sun (at least 4-6 hours) | Every 2–4 days during the growing season; keep consistently moist | Pet-safe |
| Yellow Oleander | Direct sun (at least 4-6 hours) | Every 5–10 days during establishment; drought-tolerant once established | Toxic to pets |
| Yellow Passion Fruit | Direct sun (at least 4-6 hours) | Regularly, every 3-7 days, keeping soil consistently moist during flowering and fruiting; never let it dry out hard | Mildly toxic to pets |
| Yellow Pimpernel | Medium indirect light (a couple of metres from a window) | High; keep consistently moist | Mildly toxic to pets |
| Yellow Prairie Wild Indigo | Direct sun (at least 4-6 hours) | Every 2 weeks in year 1–2; essentially drought independent once established | Toxic to pets |
| Yellow Trillium | Medium indirect light (a couple of metres from a window) | Regular during spring growing season; reduced once foliage dies back in summer. | Mildly toxic to pets |
| Yellow Trumpet Creeper | Direct sun (at least 4-6 hours) | Every 7–10 days during establishment; drought-tolerant once mature | Mildly toxic to pets |
| Yellow Trumpetbush | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; much less in winter | Mildly toxic to pets |
| Yellow Whitlow Grass | Direct sun (at least 4-6 hours) | Low — allow soil to dry between waterings | Mildly toxic to pets |
| Yellow Whitlowgrass | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; minimal in winter | Pet-safe |
| Yellow Wild Indigo | Direct sun (at least 4-6 hours) | Weekly the first season; rarely thereafter once established | Toxic to pets |
| Yellow-Bracted Nidularium | Medium indirect light (a couple of metres from a window) | Refill central cup weekly; substrate every 10–14 days | Pet-safe |
| Yellow-cup Pitcairnia | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth (spring–autumn); reduce to infrequent watering every 10–14 days in winter, allowing the top half of the substrate to dry. | Mildly toxic to pets |
| Yellow-scaled Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active winter growth; completely dry during summer dormancy | Toxic to pets |
| Yellow-Spike Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Yellow-Twig Dogwood | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | Pet-safe |
| Yellow-White Maxillaria | Bright indirect light (just back from a sunny window) | Every 2–3 days in growth, every 4–5 days in winter | Pet-safe |
| Yellow-wort | Direct sun (at least 4-6 hours) | Rarely — water only during severe drought | Mildly toxic to pets |
| Yellowish Miltonia | Bright indirect light (just back from a sunny window) | Every 2–3 days in summer, every 4–5 days in winter | Pet-safe |
| Yew Bonsai | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, typically every 2-4 days in summer and less in winter | Toxic to pets |
| Yokosca Lady Fern | Low light (north window or shaded room) | Every 2–3 days; keep soil moist to wet | Pet-safe |
| Yoshino Cherry | Direct sun (at least 4-6 hours) | Water young trees weekly in dry weather; established trees need little | Toxic to pets |
| Young's Weeping Birch | Bright indirect light (just back from a sunny window) | Weekly during establishment and dry spells; every 2 weeks once mature | Pet-safe |
| Yucca | Direct sun (at least 4-6 hours) | When the soil is mostly dry, every 10-14 days | Toxic to pets |
| Yulan Magnolia | Direct sun (at least 4-6 hours) | Weekly when young; established trees need water during prolonged dry spells | Pet-safe |
| Yunnan Cypress | Direct sun (at least 4-6 hours) | Regular during establishment; drought-tolerant once mature | Pet-safe |
| Zamia Palm | Direct sun (at least 4-6 hours) | Every 3–6 weeks | Toxic to pets |
| Zamia Pumila | Bright indirect light (just back from a sunny window) | When the top 4-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Zaragoza Ceratozamia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–5 weeks in winter | Toxic to pets |
| Zebra Grass | Direct sun (at least 4-6 hours) | Weekly for the first season; every 2–3 weeks once established | Pet-safe |
| Zebra Plant Dania | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil begins to dry, often every 4-7 days | Mildly toxic to pets |
| Zebrinus Zebra Grass | Direct sun (at least 4-6 hours) | Weekly while establishing, then during dry spells; appreciates steady moisture | Mildly toxic to pets |
| Zigzag Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; fortnightly in winter | Pet-safe |
| Zigzag Goldenrod | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water weekly in dry spells | Mildly toxic to pets |
| Zinnia 'Profusion' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, every 4-7 days; containers more often | Pet-safe |
| Zinnia elegans 'Profusion Cherry' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days | Pet-safe |
| Zinnia elegans 'Zahara Starlight Rose' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days | Pet-safe |
| Zinnia haageana 'Old Mexico' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days | Pet-safe |
| Zois's Bellflower | Direct sun (at least 4-6 hours) | Low to moderate — water sparingly; allow to nearly dry between waterings | Mildly toxic to pets |
| Zombie Palm | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 21–28 days in winter | Pet-safe |
| Zoys's Bellflower | Direct sun (at least 4-6 hours) | Allow soil to dry between waterings; very sparingly in winter | Pet-safe |
| ZZ plant | Low light (north window or shaded room) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| ZZ Plant Lucky | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, roughly every 2-3 weeks | Toxic to pets |
| ZZ Plant Raven | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, roughly every 2-3 weeks | Toxic to pets |
| ZZ Plant Variegata | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 2-3 weeks | Toxic to pets |
| ZZ Plant Zenzi | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, roughly every 2-3 weeks | Toxic to pets |
This list is not hand-picked for looks. It is houseplants whose documented watering rhythm is infrequent (they prefer to dry out fully between waterings), drawn from Growli's structured plant-care library so the selection is consistent and checkable. 4776 plants qualify today.
Growli currently lists 4776 plants that meet the criterion (houseplants whose documented watering rhythm is infrequent (they prefer to dry out fully between waterings)). The list updates as the plant-care library grows; each entry links to a full care guide.
Not necessarily — this list is selected by houseplants whose documented watering rhythm is infrequent (they prefer to dry out fully between waterings), not by pet safety. Each plant is tagged with its pet-safety status below, and links to a full ASPCA-sourced pet-safety guide. If you have pets, see the dedicated best pet-safe houseplants list.
Once you have shortlisted a plant, the next questions are watering and soil. These are the guides searched most this season: