Plants for…
Most houseplant lists are tabletop species. These are the floor anchors: plants whose mature size at home is genuinely at human-head height, not a wishful "could grow tall" caveat.
How this list is built: documented mature indoor height of 1.5 metres or more — the species that actually become floor-anchor statement plants over a few years— filtered from Growli's structured plant-care library, not hand-picked.
| 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 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 |
| 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 japonicum 'Aconitifolium' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply in dry spells | 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 palmatum 'Dissectum' | 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 palmatum 'Garnet' | 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 palmatum 'Orangeola' | 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 containers 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 |
| 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 |
| Adolphe Audusson camellia | Bright indirect light (just back from a sunny window) | Regular; keep consistently moist, especially during bud set | Mildly toxic to pets |
| Adolphe Audusson Camellia | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; keep consistently moist but not waterlogged | Pet-safe |
| Aesculifolia 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 |
| 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 |
| African Baobab | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; once a month or less in winter | Pet-safe |
| African Chain Fern | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil feels barely moist, roughly every 5-8 days in growing season | 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 Fern Pine | 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 |
| African Liana Sundew | Bright indirect light (just back from a sunny window) | Water regularly to keep the substrate evenly moist; reduce slightly during the dry-season phase if replicating natural conditions | 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 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 Oil Palm | Direct sun (at least 4-6 hours) | When the top 4-6 cm of soil is dry, roughly every 7-10 days in summer; every 14-21 days in winter | Pet-safe |
| African Spear Plant | Medium indirect light (a couple of metres from a window) | When the soil is completely dry, roughly every 2-4 weeks in summer and every 4-6 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 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 |
| 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 angustifolia | Direct sun (at least 4-6 hours) | Every 1-2 weeks in summer when soil is dry, less in winter | 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 attenuata 'Boutin Blue' | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, every 1-2 weeks in summer; sparingly in winter | Toxic to pets |
| Agave bracteosa | Bright indirect light (just back from a sunny window) | When the soil is dry, every 1-2 weeks in summer; sparingly in winter | 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 guiengola | Direct sun (at least 4-6 hours) | Every 1-2 weeks in summer when soil is dry, less 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 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 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 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 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 vilmoriniana | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 1-2 weeks in summer; sparingly 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 |
| Agnes Rose | Direct sun (at least 4-6 hours) | Deep watering once a week, more in drought or first season | 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 |
| Akebia trifoliata | 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 |
| 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 |
| 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 |
| 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 |
| Alexandra Palm | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of soil is dry, roughly every 4-7 days in growth | Mildly toxic to pets |
| Algerian Fir | Direct sun (at least 4-6 hours) | Low to moderate; highly drought-tolerant once established | Pet-safe |
| Alii 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 |
| 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 |
| Alocasia | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 5-7 days | Toxic to pets |
| Alocasia Brisbanensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-8 days in growth | Toxic to pets |
| Alocasia Calidora | 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 Cucullata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-8 days in growth | Toxic to pets |
| Alocasia Macrorrhizos Giant Upright | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil dries, often every 4-6 days in active growth | Toxic to pets |
| Alocasia Macrorrhizos Variegata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-10 days in growth | Toxic to pets |
| Alocasia Navicularis | 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 |
| 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 Platyphylla | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 4-7 days in growth | Toxic to pets |
| Alocasia Plumbea | 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 |
| Alocasia Portodora | 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 | 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 Regal Shield | Bright indirect light (just back from a sunny window) | When the top 2 inches (5 cm) of soil feel dry, roughly weekly in summer and less in winter | Toxic to pets |
| Alocasia Regal Shields | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia Sarawakensis | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 5-8 days in growth | Toxic to pets |
| Alocasia Wentii (Hardy Elephant Ear) | Bright indirect light (just back from a sunny window) | Roughly every 5-10 days; water when the top 2-3 cm (1 inch) of mix dries | 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 Comosa | Direct sun (at least 4-6 hours) | Only when bone dry, roughly every 3 weeks in active 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 Linearifolia | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry out — roughly every 1-2 weeks in summer, less in winter | Toxic to pets |
| Aloe Massawana | Direct sun (at least 4-6 hours) | When the top 2-4 cm of soil dries — roughly weekly in warm growth, much less in cool months | 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 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 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 |
| Alphonse Karr Bamboo | Direct sun (at least 4-6 hours) | Regularly during summer, approximately every 5–7 days; reduce in cooler months as growth slows | Pet-safe |
| Alphonso Mango | Direct sun (at least 4-6 hours) | Keep evenly moist in growth; water when the top 3-5 cm of soil dries, then withhold before flowering | Mildly toxic to pets |
| Alpine Clematis | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in the growing season | Toxic to pets |
| Alpine Puya | Direct sun (at least 4-6 hours) | Moderate in summer, very sparing 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 |
| Alpinia Zerumbet 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 3-6 days in warm growth | Mildly 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 |
| Amazon Moonflower Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of substrate is dry, roughly every 7-10 days in the growing season; every 2-3 weeks in a cooler rest period | Pet-safe |
| Amazonian Traveller's Tree | Bright indirect light (just back from a sunny window) | Twice weekly or more in warm weather; reduce in cooler months | Mildly toxic to pets |
| Ambarella | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant when established | Pet-safe |
| Amboina Kauri | Direct sun (at least 4-6 hours) | Every 7-10 days when the top few centimetres of soil are dry | Mildly toxic to pets |
| 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 Bittersweet | Bright indirect light (just back from a sunny window) | Water deeply once a week during the first two growing seasons; established plants are drought-tolerant and need watering only during extended dry periods | Toxic to pets |
| American Climbing Fern | Medium indirect light (a couple of metres from a window) | Keep the soil consistently and evenly moist — never allow it to dry out between waterings | Mildly toxic to pets |
| American Dunegrass | Direct sun (at least 4-6 hours) | Low; drought-tolerant | Pet-safe |
| American Elm Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil begins to dry, frequently in summer | Mildly toxic to pets |
| American Holly | Bright indirect light (just back from a sunny window) | Weekly while establishing, then during dry spells | Toxic to pets |
| American Hornbeam | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil approaches dryness, often daily in summer | Mildly toxic to pets |
| American Royal Fern | Medium indirect light (a couple of metres from a window) | Twice weekly or more; keep consistently moist | Pet-safe |
| American Turk's Cap Lily | Bright indirect light (just back from a sunny window) | Twice weekly; more in dry periods | Toxic to pets |
| American wisteria | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once mature | Toxic to pets |
| Amorphophallus decus-silvae | Bright indirect light (just back from a sunny window) | Keep evenly moist and never bone-dry in active growth; withhold once the leaf dies back for dormancy | Toxic to pets |
| Amorphophallus hewittii | Bright indirect light (just back from a sunny window) | Keep the soil consistently moist during active leaf growth; taper off sharply once the leaf yellows so the dormant tuber stays barely moist to dry. | Toxic to pets |
| Amorphophallus maximus | Bright indirect light (just back from a sunny window) | Keep evenly moist in active growth, letting the surface dry slightly; withhold once the leaf dies back | Toxic to pets |
| Amydrium Hainanense | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Amydrium medium | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Amydrium Medium Silver | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; water when the top ~25% of the mix is dry | Toxic to pets |
| Amydrium zippelianum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Anadendrum Latifolium | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Mildly toxic to pets |
| Anadendrum Michaelii | 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 |
| Anadendrum Montanum | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Mildly toxic to pets |
| Anchomanes difformis | Bright indirect light (just back from a sunny window) | Water freely in active growth keeping soil moist; keep nearly dry during dormancy | Mildly toxic to pets |
| Anchomanes giganteus | Bright indirect light (just back from a sunny window) | Water freely keeping soil moist in growth; keep nearly dry during dormancy | Mildly toxic to pets |
| 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 |
| Angel Wing Begonia | Bright indirect light (just back from a sunny window) | When the top 1-2 inches (2.5-5 cm) of soil feel dry | Toxic to pets |
| Angel Wing Begonia 'Lucerna' | 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 summer | Toxic to pets |
| Angel Wing Begonia 'Lucerna' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Angel's Fishing Rod | Direct sun (at least 4-6 hours) | Regular during spring and summer; reduced in winter | Mildly toxic to pets |
| Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 1-3 days in peak summer growth; far less when dormant or overwintering | 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 |
| Angola Culcasia | 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 |
| 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 |
| Anise-scented Sage | Bright indirect light (just back from a sunny window) | Regular throughout the growing season | Pet-safe |
| Anthurium Chamberlainii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-9 days | Toxic to pets |
| Anthurium Coriaceum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Anthurium digynum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Anthurium eminens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is just dry, roughly every 5-7 days | Toxic to pets |
| Anthurium faustomirandae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 6-9 days | Toxic to pets |
| Anthurium Magnificum | Bright indirect light (just back from a sunny window) | When the top 2 to 3 cm of mix is dry, roughly weekly | Toxic to pets |
| Anthurium nymphaeifolium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium ochranthum | 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 pentaphyllum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium Salgarense | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Anthurium salvinii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 6-9 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 |
| Aphelandra tetragona | 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 |
| 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 |
| Aptos Blue Redwood | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days in summer | Mildly toxic to pets |
| Arabian Jasmine | Direct sun (at least 4-6 hours) | Keep evenly moist in growth; water when the top 2-3 cm of soil dries, often every 3-5 days in warmth | Pet-safe |
| Arabian Spiral Flag | Medium indirect light (a couple of metres from a window) | Water regularly to maintain evenly moist soil; do not allow more than the top 2 cm to dry between waterings. | Mildly toxic to pets |
| Araca-boi Sapote | Direct sun (at least 4-6 hours) | Every 4–7 days; keep soil consistently moist | Mildly 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 |
| Areca palm | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 5-7 days | Pet-safe |
| Arikury Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| 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 |
| Armand's Clematis | 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 |
| Arrowhead plant | 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 |
| Arrowwood Viburnum | Direct sun (at least 4-6 hours) | Weekly when young; established plants tolerate both moist and occasionally dry soil | Pet-safe |
| Ashanti Blood | Direct sun (at least 4-6 hours) | Every 5–7 days during growing season; reduce in dormancy | Mildly toxic to pets |
| Ashy Broom | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Toxic to pets |
| Asian Star Jasmine | Medium indirect light (a couple of metres from a window) | Water every 7-10 days during the first growing season; established plants are fairly drought-tolerant and need watering only during prolonged dry periods | Mildly toxic to pets |
| Asian Wonder Bamboo | Medium indirect light (a couple of metres from a window) | 2-3 times per week during active growth; once per week in cool or dormant periods | Pet-safe |
| Assai Palm | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in warm weather | 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 'Harrington's Pink' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Ataulfo Mango | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil dries in growth; withhold before flowering | Mildly toxic to pets |
| Atemoya | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm dries; keep steady during fruiting | 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 |
| 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 |
| Augustine's rhododendron | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; reduce in winter | Toxic to pets |
| Aunt Eliza Montbretia | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season; allow to dry back naturally in autumn | Mildly toxic to pets |
| Austral Bracken | Direct sun (at least 4-6 hours) | Once established, largely drought-tolerant; water deeply once a week in dry spells | 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 Cabbage Palm | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm of soil dries out, roughly every 10-14 days in active growth | Pet-safe |
| 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 Fan Palm | 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 |
| 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 |
| Australian Tree Fern | Bright indirect light (just back from a sunny window) | 2-3 times per week; increase in heat and wind | Pet-safe |
| Australian Tree Fern | Bright indirect light (just back from a sunny window) | Keep the soil and trunk consistently moist; water every few days in warm weather, soaking the root zone | Mildly toxic to pets |
| Autumn Brilliance serviceberry | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once established | Pet-safe |
| Autumn Cascades Tupelo | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Mildly toxic to pets |
| Autumn Gold Maidenhair Tree | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days when young | Toxic to pets |
| Autumn heath | Direct sun (at least 4-6 hours) | Fortnightly during establishment; drought-tolerant once established | Pet-safe |
| Azalea 'Firefly' | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 7-10 days during the growing season | Toxic to pets |
| Azalea 'Gibraltar' | Bright indirect light (just back from a sunny window) | Deeply once or twice a week in dry weather; keep consistently moist year-round | Toxic to pets |
| Azores Jasmine | Direct sun (at least 4-6 hours) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Babaco | Bright indirect light (just back from a sunny window) | Keep consistently moist; water 2-3 times weekly in growth, less in winter | Mildly toxic to pets |
| Bacon Avocado | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, roughly every 5-7 days in warm growth | Toxic to pets |
| Bacuri | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-8 days in growth | Mildly toxic to pets |
| Bailey Palm | Direct sun (at least 4-6 hours) | When the top 6-10 cm of soil is dry, roughly every 10-14 days in the growing season; every 4-6 weeks in winter | 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 |
| Balao Anthurium | Bright indirect light (just back from a sunny window) | When the top 15-20% of the mix dries out | Toxic to pets |
| Balbis Banana | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in summer | Pet-safe |
| Bald Cypress | Direct sun (at least 4-6 hours) | Daily in summer; can stand in a water tray during heat | Mildly toxic to pets |
| Bald Cypress Bonsai 'Cascade' | Direct sun (at least 4-6 hours) | Keep consistently moist; in summer often daily, and it can stand in a shallow water tray | Mildly 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 |
| Balisier Heliconia | Bright indirect light (just back from a sunny window) | Every 5–7 days; soil should remain evenly moist | Mildly toxic to pets |
| Ballerina Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | 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 |
| Baltic Blue Pothos | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days; let the top 1-2 inches (2.5-5 cm) of soil dry out first | 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 |
| Bamboo Palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 inch) of soil is dry, roughly every 7-10 days | Pet-safe |
| Banana Croton | Bright indirect light (just back from a sunny window) | When the top 1-2.5 cm (half to one inch) of compost is dry, roughly every 7-10 days in summer | Toxic to pets |
| Banana Passion Fruit | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days in active growth | Mildly toxic to pets |
| Banana passionflower | Bright indirect light (just back from a sunny window) | Weekly in growing season, reduce in winter | Mildly toxic to pets |
| Banana passionfruit | Bright indirect light (just back from a sunny window) | Every 7–10 days; keep evenly moist | Mildly toxic to pets |
| 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 |
| 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 |
| Baron's Palm | Bright indirect light (just back from a sunny window) | Every 4–7 days; adjust based on temperature and container vs. in-ground | Pet-safe |
| Barrelier's Sage | Direct sun (at least 4-6 hours) | Weekly to establish, then fortnightly | 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 |
| 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 |
| Beach Cabbage | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Mildly toxic to pets |
| Bear Tupelo | Bright indirect light (just back from a sunny window) | Regularly; keep consistently moist | Pet-safe |
| Bearberry Cotoneaster | Direct sun (at least 4-6 hours) | Fortnightly once established; more frequent for the first growing season | Mildly toxic to pets |
| 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 Fuchsia | Bright indirect light (just back from a sunny window) | Water freely in growth; reduce in winter | 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 |
| Beefsteak Heliconia | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water every 3-5 days in warm weather | Mildly toxic to pets |
| Beehive Ginger | Medium indirect light (a couple of metres from a window) | Water consistently to keep soil moist; do not allow dryout during the growing season. | Mildly toxic to pets |
| Begonia 'Corallina de Lucerna' | 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 'Irene Nuss' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-8 days in growth | Toxic to pets |
| Begonia 'Lucerna' | 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 'Sophie Cecile' | 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 albopicta | 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 convolvulacea | 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 |
| Begonia reniformis | 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 |
| Belize Sage | Bright indirect light (just back from a sunny window) | Twice weekly during active growth | Pet-safe |
| Bella Palm | 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 in growth | Pet-safe |
| Belle Etoile Mock Orange | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days | Mildly toxic to pets |
| 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 Alligator Flag | Direct sun (at least 4-6 hours) | Aquatic marginal — roots permanently in shallow water or waterlogged soil | Mildly toxic to pets |
| Bent Enkianthus | Bright indirect light (just back from a sunny window) | Regular — keep consistently moist | Toxic to pets |
| 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 |
| 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 |
| 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 Red Sage | Bright indirect light (just back from a sunny window) | Moderate; keep evenly moist, especially during establishment | 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 |
| Bird of paradise | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Bird of Paradise | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Mildly toxic to pets |
| 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 Spruce | Direct sun (at least 4-6 hours) | Moderate; water during dry spells in the first two years, then largely self-sufficient | Pet-safe |
| 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 |
| Bishop Heliconia | Bright indirect light (just back from a sunny window) | Every 2–3 days in summer, weekly in winter | 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 |
| Black Ash | Direct sun (at least 4-6 hours) | High; requires consistently moist to wet soil | 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 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 Knight Butterfly Bush | Direct sun (at least 4-6 hours) | Every 7-10 days during the first growing season; established plants are drought-tolerant and require supplemental watering only during extended dry spells | Toxic to pets |
| Black Lily Magnolia | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduce in winter | Pet-safe |
| 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 Olive Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days | Mildly toxic to pets |
| Black Rose Aeonium | Direct sun (at least 4-6 hours) | Every 1–2 weeks autumn to spring; minimal in summer dormancy | Mildly toxic to pets |
| Black Sapote | 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 |
| Black Spruce | Direct sun (at least 4-6 hours) | Consistent moisture; tolerates waterlogging — does not dry out between waterings | Pet-safe |
| Black Tree Fern | Bright indirect light (just back from a sunny window) | Daily in warm/windy conditions; 3 times per week in cool seasons | Pet-safe |
| Black-eyed Susan vine | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days in summer | Mildly toxic to pets |
| Black-Eyed Susan Vine | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | 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 Cyphostemma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; withhold almost completely in winter dormancy | Mildly toxic to pets |
| Bladder-flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Blanc Double de Coubert Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Blaze Improved Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, more during heat | Pet-safe |
| Bleeding heart vine | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil dries | Mildly toxic to pets |
| Bleeding Heart Vine | 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 |
| Blood Banana | Direct sun (at least 4-6 hours) | Roughly weekly in active growth; every 10-14 days in winter | 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 |
| Bloodgood Japanese Maple | 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 summer; weekly to fortnightly in autumn and spring | Pet-safe |
| Blue Anise Sage | Bright indirect light (just back from a sunny window) | Weekly | 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 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 Cereus | Direct sun (at least 4-6 hours) | Every 14–21 days in summer; every 4–6 weeks in winter | Pet-safe |
| Blue China Fir | Direct sun (at least 4-6 hours) | Regular when young; moderate once established | Mildly toxic to pets |
| Blue China Fir | Direct sun (at least 4-6 hours) | Deeply once per week during the first two growing seasons; established plants are fairly drought-tolerant | 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 Columnar Cactus | Direct sun (at least 4-6 hours) | When the top half of soil is dry, roughly every 10-14 days in summer; every 4-6 weeks in winter | Pet-safe |
| Blue Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks | Toxic to pets |
| Blue Cycas | Bright indirect light (just back from a sunny window) | Water when the top 3-5 cm of soil is dry, about every 1-2 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 Douglas Fir | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days when young | 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 Ginger | Bright indirect light (just back from a sunny window) | Keep soil consistently moist, watering every 5-7 days in the growing season | Mildly toxic to pets |
| Blue Holly 'Blue Princess' | Bright indirect light (just back from a sunny window) | Weekly while establishing, then during dry spells | Toxic to pets |
| Blue Ice Arizona Cypress | Direct sun (at least 4-6 hours) | Every 10-14 days while establishing; drought-tolerant once established | Mildly 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 Latan Palm | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| Blue Morning Glory | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in warm weather | 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 Passion Flower | Direct sun (at least 4-6 hours) | Water thoroughly when the top 3-5 cm of soil is dry, roughly every 7-10 days; more frequently in hot summers, reduce significantly in winter | 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 Puya | Direct sun (at least 4-6 hours) | When the soil is dry to at least 5 cm depth, roughly every 14-21 days in summer; sparingly in winter | Mildly toxic to pets |
| Blue Rug Juniper | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| 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 Surprise Cypress | Direct sun (at least 4-6 hours) | Keep evenly moist; deep weekly watering while establishing, then in dry periods | 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 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-green Adenia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; withhold entirely in winter dormancy | Toxic to pets |
| Blue-leaved Parlour Palm | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer, every 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 |
| Blunt-Leaf Wax Plant | Medium indirect light (a couple of metres from a window) | Every 7–14 days in growing season; reduce significantly in winter | Pet-safe |
| 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 |
| 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 |
| Bog Sage | Direct sun (at least 4-6 hours) | Moderate to high — keep soil consistently moist | Mildly toxic to pets |
| Bolivian Fuchsia | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; every 14 days in winter | Pet-safe |
| 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 |
| Bonica Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | Pet-safe |
| 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 |
| 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 'Raspberry Ice' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 5-10 days | Pet-safe |
| 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 |
| 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 |
| 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 |
| Bowman's Dieffenbachia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 8-12 days | 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 |
| Bracted Aechmea | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| 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 |
| 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 Rain Tree Bonsai | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the surface just begins to dry | Mildly toxic to pets |
| 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 |
| Brazilian Waterweed | Bright indirect light (just back from a sunny window) | Permanently submerged | 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 |
| 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 |
| Brewster Lychee | Direct sun (at least 4-6 hours) | 2–3 times per week in active growth; withhold irrigation for 4–6 weeks before expected bloom | 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 |
| Bridal Wreath Spirea | Direct sun (at least 4-6 hours) | Every 7-10 days during dry spells; established plants are drought-tolerant | Pet-safe |
| Brillantaisia subulugurica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil dries, about every 3-5 days in heat | Mildly toxic to pets |
| Brilliant Hibiscus | Direct sun (at least 4-6 hours) | Regularly during growth; reduce in winter | Mildly toxic to pets |
| Brilliantissima red chokeberry | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once established | 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 |
| Bristol Ruby Weigela | Direct sun (at least 4-6 hours) | Every 7-10 days during dry spells; established plants cope with moderate drought | Pet-safe |
| Broad-leaf Horncone | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in the growing season; every 3–4 weeks in winter | 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 Pondweed | Direct sun (at least 4-6 hours) | Fully submerged aquatic; grows in 30 cm to 150 cm of water | 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 |
| Broom Palm | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-14 days in the growing season | Pet-safe |
| 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 |
| Buddha's Belly Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week in warm seasons; reduce in winter | Pet-safe |
| 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 |
| Buddhist Pine | 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 |
| 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 |
| Buff Beauty Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat or against a warm wall | Pet-safe |
| Bugle Lily | Direct sun (at least 4-6 hours) | Regular during growth; reduce in winter | Mildly toxic to pets |
| Bulbifer Voodoo Lily | Bright indirect light (just back from a sunny window) | Keep evenly moist while in leaf; keep the corm dry through dormancy | Toxic to pets |
| Bulbil Bugle Lily | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-14 days during active growth | Mildly toxic to pets |
| 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 |
| Burgundy Rubber Plant | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in growth | 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 |
| Burmese Grape | Direct sun (at least 4-6 hours) | Regular watering; 2–3 times per week; do not let soil dry out completely | Mildly toxic to pets |
| 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 |
| 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 |
| Butomus umbellatus | Direct sun (at least 4-6 hours) | Constantly wet; shallow margin | 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 |
| 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 |
| Buttonwood Bonsai | Direct sun (at least 4-6 hours) | When the top of the soil starts to dry, often daily in heat | Mildly toxic to pets |
| 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 |
| Café au Lait Dahlia | Direct sun (at least 4-6 hours) | 2–3 times per week | Mildly toxic to pets |
| Cajuru Vine | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil consistently moist but not waterlogged | Mildly toxic to pets |
| Calathea Crotalifera | 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 warm weather | Pet-safe |
| Calathea Lutea (Cuban Cigar) | Bright indirect light (just back from a sunny window) | Keep consistently moist; water when the top 2-3 cm dries, often every 3-5 days in heat | 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 Warscewiczii Jungle Velvet Dark | 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 |
| Calico flower | Medium indirect light (a couple of metres from a window) | Once or twice a week during the growing season; once a week or less in winter. | Toxic to pets |
| 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 Fescue | Bright indirect light (just back from a sunny window) | Water every 10-14 days during the first growing season; established plants are summer-dormant and very drought-tolerant, needing little or no supplemental water | Pet-safe |
| 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 |
| 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 |
| Cambuci | Direct sun (at least 4-6 hours) | Weekly; more frequent during fruit development | Mildly toxic to pets |
| Camellia 'Alba Plena' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, every 7-10 days during active growth | Pet-safe |
| Camellia 'Anticipation' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days during the growing season | Pet-safe |
| Camellia 'Bob Hope' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during the growing season | Pet-safe |
| Camellia 'Brushfield's Yellow' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost or soil is dry, roughly every 5-7 days during active growth | Pet-safe |
| Camellia 'Debbie' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Camellia 'Dixie Knight' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil or compost is dry, roughly every 5-7 days in the growing season | Pet-safe |
| 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 'Elegans' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during growth | Pet-safe |
| Camellia 'Hagoromo' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost or soil is dry, roughly every 5-7 days during active growth | Pet-safe |
| Camellia 'J.C. Williams' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days during the growing season | 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 |
| Camellia 'Jury's Yellow' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days during active growth | Pet-safe |
| Camellia 'Kramer's Supreme' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during active growth | Pet-safe |
| Camellia 'Midnight Magic' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-10 days during active growth | Pet-safe |
| Camellia 'Mine-no-Yuki' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days through the growing season | Pet-safe |
| Camellia 'Nuccio's Gem' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-10 days in active growth | Pet-safe |
| Camellia 'Spring Festival' | 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 |
| Camellia 'Water Lily' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil or compost is dry, roughly every 5-7 days during the growing season | Pet-safe |
| Camellia 'Yuletide' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during active growth | 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 |
| Campbell's Magnolia | Direct sun (at least 4-6 hours) | Every 7-10 days during the first three growing seasons; established trees need watering only during prolonged summer drought | Pet-safe |
| 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 |
| Canadian Waterweed | Medium indirect light (a couple of metres from a window) | Permanently submerged | Pet-safe |
| Canadian Yew | Low light (north window or shaded room) | Weekly during establishment; every 1–2 weeks once established | Toxic to pets |
| Canary creeper | Bright indirect light (just back from a sunny window) | Water regularly to keep soil evenly moist, roughly every 5–7 days | Pet-safe |
| 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 Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; minimal in cool or wet periods | Pet-safe |
| Canary Reed Grass | Bright indirect light (just back from a sunny window) | Keep consistently moist to wet; tolerates standing water | Mildly toxic to pets |
| 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 Sage | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season | Pet-safe |
| Candle larkspur | Direct sun (at least 4-6 hours) | Regular — deep watering 2–3 times per week during active growth; reduce in dormancy | Toxic to pets |
| Candle Larkspur 'Guardian Blue' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| 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 'Bengal Tiger' | Direct sun (at least 4-6 hours) | Water every 2-3 days in summer to keep soil consistently moist | Mildly toxic to pets |
| Canna 'Black Knight' | Direct sun (at least 4-6 hours) | Keep evenly moist throughout the growing season, watering every 2-4 days depending on temperature | Mildly toxic to pets |
| Canna 'Durban' | Direct sun (at least 4-6 hours) | Water regularly to keep soil evenly moist, roughly every 2-3 days in summer heat | Mildly toxic to pets |
| Canna 'Phasion' | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 2-3 days in warm weather, more often in containers | Mildly toxic to pets |
| Canna 'Pretoria' | Direct sun (at least 4-6 hours) | Water deeply 2-3 times per week during the growing season; reduce sharply once foliage dies back in autumn | Mildly toxic to pets |
| Canna 'Red King Humbert' | Direct sun (at least 4-6 hours) | Water deeply 2-3 times per week in summer; reduce once foliage begins to die back in autumn | Mildly toxic to pets |
| Canna 'Roi Humbert' | Direct sun (at least 4-6 hours) | Keep soil consistently moist, watering every 2-3 days in warm weather or whenever the top 2-3 cm dries out | Mildly toxic to pets |
| Canna 'Tropicanna' | Direct sun (at least 4-6 hours) | Water deeply 2-3 times per week during summer; reduce watering once plants go dormant in autumn | Mildly toxic to pets |
| Canna 'Wyoming' | Direct sun (at least 4-6 hours) | Water deeply 2-3 times per week during summer; taper off in autumn as growth slows | Mildly toxic to pets |
| Canna 'Yellow King Humbert' | Direct sun (at least 4-6 hours) | Water every 2-3 days to maintain consistently moist soil during the growing season | Mildly toxic to pets |
| Canton Fishtail Palm | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | 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 Leadwort (Blue Plumbago) | Direct sun (at least 4-6 hours) | Weekly in active growth; let the top of the soil dry between waterings | Mildly toxic to pets |
| Caramel Marble | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Caranday Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in dry season / winter | Pet-safe |
| Cardboard Palm | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in summer; roughly halve in autumn/winter | Toxic to pets |
| Cardinal climber | Direct sun (at least 4-6 hours) | Once or twice a week; approximately 2.5 cm (1 in) per week | 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 |
| Carefree Wonder Rose | Direct sun (at least 4-6 hours) | Deep soak once or twice a week depending on heat | Pet-safe |
| Carex pendula | Medium indirect light (a couple of metres from a window) | Keep soil moist; water in dry spells | Mildly toxic to pets |
| Caribbean Royal Palm | Direct sun (at least 4-6 hours) | Twice weekly when young; established trees weekly or as needed | Pet-safe |
| Caribbean Royal Palm | Direct sun (at least 4-6 hours) | When the top 4-6 cm of soil is dry, roughly every 7-10 days in the growing season; every 14-21 days in drier winter months | Pet-safe |
| 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 |
| Carnauba Wax Palm | Direct sun (at least 4-6 hours) | When the top 5-10 cm of soil is dry, roughly every 10-14 days in the growing season; every 3-5 weeks in winter | Pet-safe |
| 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 |
| Carolina Queen Lotus | Direct sun (at least 4-6 hours) | Permanently submerged; maintain 5–15 cm (2–6 in) of water over the soil surface for established plants | Pet-safe |
| Carpentaria Palm | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in warm weather | Pet-safe |
| Caryota No | 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 |
| Caryota Obtusa | 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 |
| 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 |
| 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 |
| Castlewellan Cypress | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days for young plants | Mildly toxic to pets |
| Cat Palm | Bright indirect light (just back from a sunny window) | Keep consistently moist | Pet-safe |
| 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 Claw Vine | Direct sun (at least 4-6 hours) | Water every 7-14 days during establishment; extremely drought-tolerant once established and rarely needs supplemental watering | 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 | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 7–14 days once established | 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 |
| Cathaya argyrophylla | Bright indirect light (just back from a sunny window) | When the top few cm of soil begins to dry, roughly every 5-7 days for young plants in growth | 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 |
| 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 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 |
| Cebu Blue Pothos | Bright indirect light (just back from a sunny window) | When top 2-3cm of soil is dry; roughly every 7-14 days indoors | 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 |
| Celadine Frangipani | Direct sun (at least 4-6 hours) | Every 7–14 days in growth; reduce sharply in autumn; minimal in winter | Toxic to pets |
| 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 |
| Central Australian Cabbage Palm | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry between waterings | Pet-safe |
| Central Australian Cabbage Palm | Direct sun (at least 4-6 hours) | Water deeply every 14-21 days; highly drought-tolerant once established | Pet-safe |
| 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 |
| Ceratozamia hildae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly weekly in growth | Toxic to pets |
| Ceratozamia mexicana | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly weekly in growth | Toxic to pets |
| Ceratozamia robusta | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly weekly in growth | 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 |
| Cercestis Stigmaticus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 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 |
| Ceylon Cardamom | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water when the surface feels just dry, approximately every 5-7 days | Mildly toxic to pets |
| 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 Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days | Mildly toxic to pets |
| Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce in winter | Toxic to pets |
| Chamaedorea Hooperiana | 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 |
| Chamaedorea Microspadix | 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 |
| 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 |
| 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 |
| Charles Joly Lilac | Direct sun (at least 4-6 hours) | Every 7-10 days during dry periods; drought-tolerant once established | Mildly toxic to pets |
| 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 |
| Chempedak | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply 2-3 times weekly in warm growth | 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 |
| Cherimoya | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm dries during growth; reduce in dormancy | 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 Rio Grande | Direct sun (at least 4-6 hours) | Water 2–3 times per week during warm months; once weekly in cooler, dormant periods. | 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 |
| Chiapas Arrowhead 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 |
| Chilean Bamboo | Bright indirect light (just back from a sunny window) | Weekly during establishment; twice weekly in dry summer heat | Pet-safe |
| Chilean Jasmine | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days in summer | 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 |
| 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 Cardamom | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water when the surface just begins to dry, roughly every 4-6 days in warm conditions | 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 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 Enkianthus | Bright indirect light (just back from a sunny window) | Regularly throughout the growing season | 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 Fan Palm | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil dries out, roughly every 7-14 days | Pet-safe |
| 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 Hackberry | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil dries, often daily in summer | 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 Honeysuckle | Direct sun (at least 4-6 hours) | Every 3–5 days during the growing season; reduce in cooler months | Mildly toxic to pets |
| Chinese Incense Cedar | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days for young plants | Mildly toxic to pets |
| 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 Juniper | Direct sun (at least 4-6 hours) | Low to moderate; water regularly until established, then drought-tolerant | Mildly toxic to pets |
| Chinese Juniper 'Itoigawa' | Direct sun (at least 4-6 hours) | When the soil surface is approaching dry, then water thoroughly | Mildly toxic to pets |
| Chinese Larch | Direct sun (at least 4-6 hours) | Regular during establishment and growing season; reduced in dormancy | Pet-safe |
| 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 Premna | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil dries, often daily in warm growth | Mildly toxic to pets |
| Chinese Redbud | Direct sun (at least 4-6 hours) | Every 7-10 days during the first two growing seasons; established plants roughly every 14 days in dry spells | Toxic to pets |
| Chinese Swamp Cypress | Direct sun (at least 4-6 hours) | Keep consistently moist to wet; tolerates prolonged inundation | 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 Trumpet Creeper | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days once established | Toxic to pets |
| 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 Weeping Cypress | Direct sun (at least 4-6 hours) | Regular during establishment; drought-tolerant once mature | Pet-safe |
| Chinese White Pine | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry; allow slight drying between waterings | 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 Witch Hazel | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in the growing season | 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 |
| Chinese Yew | Medium indirect light (a couple of metres from a window) | Weekly during establishment; every 1–2 weeks once established | 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 |
| Choisya 'Sundance' | Direct sun (at least 4-6 hours) | Water weekly while establishing, then only during extended dry periods | 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 Heliconia | Bright indirect light (just back from a sunny window) | Weekly, or more frequently in warm weather | Mildly toxic to pets |
| Christmas Palm | Direct sun (at least 4-6 hours) | Every 5–7 days; allow top 2–3 cm of soil to dry between waterings | Pet-safe |
| Christmas Palm | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in warmth | Pet-safe |
| Chrysanthemum 'Golden Cascade' | Direct sun (at least 4-6 hours) | Every 3-5 days for container-grown plants; every 5-7 days in the ground when the top 2-3 cm of soil is dry | Toxic to pets |
| Chusan Palm | Bright indirect light (just back from a sunny window) | Weekly in summer, monthly in winter | Pet-safe |
| Cilician Fir | Direct sun (at least 4-6 hours) | Moderate; drought-tolerant once established | Pet-safe |
| Cinnamon Fern | Low light (north window or shaded room) | Keep consistently moist to wet; water whenever the surface begins to dry, often every 3-5 days | Mildly toxic to pets |
| Cissus Discolor | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, about every 4-7 days in warmth | Pet-safe |
| Cissus javana | 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 | Mildly toxic to pets |
| 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 |
| Cissus rotundifolia | 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 |
| Clara Fan Palm | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is completely dry, roughly every 14-21 days in summer | Pet-safe |
| Cleistocactus baumannii | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly weekly in summer; sparingly in winter | 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 'Comtesse de Bouchaud' | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the growing season; more in heat or sandy soil | Toxic to pets |
| Clematis 'Doctor Ruppel' | Direct sun (at least 4-6 hours) | Deeply once or twice a week during the growing season; reduce in autumn and winter | Toxic to pets |
| Clematis 'Dr. Ruppel' | 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 'Duchess of Edinburgh' | Bright indirect light (just back from a sunny window) | Once or twice a week during the growing season | Toxic to pets |
| Clematis 'Ernest Markham' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about weekly in summer | Toxic to pets |
| Clematis 'Etoile Violette' | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the growing season | Toxic to pets |
| Clematis 'Fireworks' | Direct sun (at least 4-6 hours) | Once or twice a week in the growing season; reduce in autumn | Toxic to pets |
| Clematis 'General Sikorski' | Direct sun (at least 4-6 hours) | Once or twice a week during the growing season | Toxic to pets |
| Clematis 'H.F. Young' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil or compost is dry, roughly every 5-7 days in the growing season | 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 'Jackmanii' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water deeply once or twice weekly in dry weather | Toxic to pets |
| Clematis 'Lasurstern' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil or compost is dry, roughly every 5-7 days in the growing season | 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 'Mrs N. Thompson' | Direct sun (at least 4-6 hours) | Once or twice a week during the growing season; reduce in cooler months | 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 'Nelly Moser' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply once or twice a week in dry spells | Toxic to pets |
| Clematis 'Niobe' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about weekly in summer | Toxic to pets |
| Clematis 'Perle d'Azur' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 5-7 days during active growth | Toxic to pets |
| Clematis 'Piilu' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days during the growing season | Toxic to pets |
| Clematis 'Polish Spirit' | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week through the growing season | Toxic to pets |
| Clematis 'Rebecca' | 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 'Rouge Cardinal' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Clematis 'Rubens' | Direct sun (at least 4-6 hours) | Once or twice a week during dry spells, especially the first two seasons | Toxic to pets |
| Clematis 'The President' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply once or twice a week in dry spells | Toxic to pets |
| Clematis 'Ville de Lyon' | 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 'Warszawska Nike' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about weekly in summer | Toxic to pets |
| Clematis 'Westerplatte' | 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 florida 'Sieboldii' | 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 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 montana 'Grandiflora' | Direct sun (at least 4-6 hours) | Once or twice a week while establishing; drought-tolerant once mature | Toxic to pets |
| Clematis recta | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the growing season | 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 '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 |
| Clethra barbinervis | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply weekly in the first two seasons and during dry spells | 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 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 Date Palm | Direct sun (at least 4-6 hours) | Deeply every 7-10 days while establishing, then moderate | Pet-safe |
| Cliff Date Palm | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm of soil is dry, roughly every 10-14 days | 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 Chamaedorea | 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 |
| Climbing Culcasia | 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 |
| 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 Iceberg Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, more during heat | Pet-safe |
| Climbing Oleander | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; allow topsoil to dry slightly between waterings | Toxic to pets |
| Climbing Onion | Bright indirect light (just back from a sunny window) | Every 1–2 weeks while vining; withhold water during dry-season dormancy | 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 |
| Cloud Nine Dogwood | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduce in winter | Mildly toxic to pets |
| Clove Vine | Bright indirect light (just back from a sunny window) | Every 5–7 days during the growing season; reduce in winter | Mildly toxic to pets |
| Clumping Bamboo | Bright indirect light (just back from a sunny window) | Twice to three times per week during establishment; weekly once established | Pet-safe |
| Clumping Blue Bamboo | Bright indirect light (just back from a sunny window) | Consistently moist throughout the growing season; water every 5–7 days or as needed to keep soil from drying out | Pet-safe |
| Clustering Fishtail Palm | Bright indirect light (just back from a sunny window) | Water 1–2 times per week in active growth, reducing to weekly in winter | Toxic to pets |
| Coast Redwood Bonsai | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil starts to dry, often daily in warm weather | Mildly toxic to pets |
| 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 |
| Cobaea scandens | Direct sun (at least 4-6 hours) | Keep evenly moist through the growing season; water containers regularly | 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 |
| 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 |
| Coffee Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly every 5-7 days in summer and less in winter | Toxic to pets |
| 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 'Black Magic' | Bright indirect light (just back from a sunny window) | Keep soil constantly moist to 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 'Mojito' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; often 2-3+ times per week in active growth | Toxic to pets |
| Colocasia 'Pink China' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet; water whenever the top inch starts to dry | 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 Burgundy Stem | Direct sun (at least 4-6 hours) | Keep constantly moist to wet; water whenever the surface starts to dry | Toxic to pets |
| Colocasia Colocasia Gigantea Thailand Giant | Direct sun (at least 4-6 hours) | Keep constantly moist to wet; water daily in heat, or stand in shallow standing water | 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 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 Illustris Black Runner | Direct sun (at least 4-6 hours) | Keep constantly moist; water daily in heat, or stand in 2-5 cm of standing water | 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 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 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 |
| 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 |
| Columnar Italian Cypress | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 14-21 days once established | 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 |
| Comfrey-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Moderate during the growing season; reduce significantly in winter. Established plants in the ground need watering only during extended dry spells. | Mildly toxic to pets |
| 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 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 Club-rush | Direct sun (at least 4-6 hours) | Permanently aquatic; plant at 30–150 cm (12–60 in) water depth | Pet-safe |
| 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 Gorse | Direct sun (at least 4-6 hours) | rarely after establishment | Toxic to pets |
| Common hollyhock | Direct sun (at least 4-6 hours) | Weekly when established; more in heat or drought | Mildly toxic to pets |
| Common Ironweed | Direct sun (at least 4-6 hours) | Moderate to high — keep soil moist | Mildly toxic to pets |
| 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 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 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 Pothos | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| 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 Rush | Direct sun (at least 4-6 hours) | Permanently wet or standing water to 15 cm (6 in) deep | Pet-safe |
| Common teasel | Direct sun (at least 4-6 hours) | Rarely needs supplemental watering once established; water seedlings regularly | Pet-safe |
| Common tobacco | Direct sun (at least 4-6 hours) | Every 3–5 days; maintain consistently moist soil | Toxic to pets |
| Common Witch Hazel | Medium indirect light (a couple of metres from a window) | Roughly every 7-10 days during establishment; established plants need watering every 10-14 days in dry periods | Mildly toxic to pets |
| 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 |
| Compact Alpine Fir | Direct sun (at least 4-6 hours) | Moderate; regular when establishing, low to moderate once established | Mildly toxic to pets |
| Compact Gem Bosnian Pine | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Compact Japanese Umbrella Pine | Bright indirect light (just back from a sunny window) | Weekly during growing season; reduce in winter | Pet-safe |
| 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 |
| Compact White Fir | Direct sun (at least 4-6 hours) | Every 10-14 days during the first two years; drought-tolerant once established | Mildly toxic to pets |
| Compacta Holly | Direct sun (at least 4-6 hours) | Weekly deep watering when establishing, then every 7-14 days in dry periods | Toxic to pets |
| Compass Plant | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | Pet-safe |
| Compassion Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly when young; established plants when the top 5 cm of soil is dry | Pet-safe |
| Confederate Rose | Direct sun (at least 4-6 hours) | Regularly during growth; deeply once or twice per week | Mildly toxic to pets |
| 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 |
| Consolea Moniliformis | Direct sun (at least 4-6 hours) | When the mix is fully dry, about every 1-2 weeks in summer; sparse in winter | Mildly toxic to pets |
| Constance Spry 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 | 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 |
| Copal Bursera | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; once or twice monthly in winter | Mildly toxic to pets |
| Coral Bark Japanese Maple 'Sango-kaku' | Bright indirect light (just back from a sunny window) | Once or twice weekly through the growing season | Pet-safe |
| Coral Bark Maple | 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 summer; reduce in winter | Pet-safe |
| 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 | 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 |
| 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 |
| 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 |
| Corky-Stemmed Passion Flower | 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 summer | Mildly toxic to pets |
| 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 Plant | Bright indirect light (just back from a sunny window) | When the top 2.5cm (1in) of compost is dry, roughly every 7-10 days in summer | Toxic to pets |
| Cornelia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in heat | Pet-safe |
| Cornus kousa 'Miss Satomi' | Direct sun (at least 4-6 hours) | Water deeply weekly while establishing; supplement in dry spells | Pet-safe |
| Corrugated Sage | Bright indirect light (just back from a sunny window) | Weekly | Mildly toxic to pets |
| Corsican Heath | Direct sun (at least 4-6 hours) | Moderate; water occasionally once established | Mildly toxic to pets |
| 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 |
| Costa Rica Bamboo Palm | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer, every 14 days in winter | Pet-safe |
| Costa Rica Bamboo Palm | 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 in active growth | Pet-safe |
| Costa Rica Pitaya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 2-4 weeks in winter | Pet-safe |
| Costus Woodsonii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 3-6 days in warm growth | Mildly toxic to pets |
| 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 |
| Cottontop Cactus | Direct sun (at least 4-6 hours) | Every 3–5 weeks in summer; completely dry in winter | 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 |
| Crape Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days during growing season; reduce 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 |
| Creeping Blue Blossom | Direct sun (at least 4-6 hours) | Every 7-10 days during the first growing season; established plants are very drought-tolerant and need supplemental watering only in prolonged dry summers | 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 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 Sage | Bright indirect light (just back from a sunny window) | Weekly during the growing season | Pet-safe |
| Creeping Willow | Direct sun (at least 4-6 hours) | frequent — keep soil reliably moist | Mildly toxic to pets |
| Crepe Ginger | Bright indirect light (just back from a sunny window) | Frequent in growing season, minimal in dormancy | Mildly toxic to pets |
| Crested Bracken | Medium indirect light (a couple of metres from a window) | every 1-2 weeks once established | Toxic to pets |
| Cretan Climbing Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Mildly 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 |
| Cretan Date Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| 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 Ginger Flower | Bright indirect light (just back from a sunny window) | 2–3 times per week | Mildly toxic to pets |
| 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 |
| Crippsii Hinoki 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 |
| 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 |
| Crossvine | Bright indirect light (just back from a sunny window) | Weekly when young; established plants are drought-tolerant | Mildly toxic to pets |
| Croton | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 5-7 days | 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 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 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 |
| 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 |
| Cuban Cigar Calathea | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; typically water when the top 2-3 cm feels dry | Pet-safe |
| Cuban Petticoat Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; every 3-5 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 |
| Cuming's Medinilla | Bright indirect light (just back from a sunny window) | Every 7–10 days in spring and summer; every 14–21 days in autumn and winter | Mildly toxic to pets |
| 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 Ginger | 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 summer | Mildly toxic to pets |
| Cup of gold vine | Direct sun (at least 4-6 hours) | Water to keep soil evenly moist during the growing season; reduce to occasional deep watering in winter | 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 |
| 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 |
| 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 |
| Curled-Spathe Heliconia | Bright indirect light (just back from a sunny window) | 2–3 times per week in warm months; once per week in cooler conditions | Mildly toxic to pets |
| Curly Kentia Palm | 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 |
| Curly Sentry Palm | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 14–21 days in winter | Pet-safe |
| Curly Waterweed | Bright indirect light (just back from a sunny window) | Fully submerged; ponds — no regular water changes needed; aquariums — 20-25% weekly | 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 |
| 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 |
| Cutite | Bright indirect light (just back from a sunny window) | Every 4–7 days; maintain consistent moisture without waterlogging | Mildly toxic to pets |
| Cutleaf coneflower | Direct sun (at least 4-6 hours) | Twice weekly during establishment; weekly or more in dry spells once established | 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 |
| 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 |
| Cyperus alternifolius | Bright indirect light (just back from a sunny window) | Keep constantly wet; stand the pot in a saucer of water that never dries out | Mildly toxic to pets |
| Cyperus involucratus | Bright indirect light (just back from a sunny window) | Keep constantly wet; stand in water and never let the soil dry | Mildly toxic to pets |
| Cyperus papyrus | Direct sun (at least 4-6 hours) | Keep constantly wet; stand in water or water daily so the soil is never dry | Mildly toxic to pets |
| 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 |
| Dahlia | Direct sun (at least 4-6 hours) | Deep watering 2-3 times per week, more in heat | Toxic to pets |
| Dahlia | Direct sun (at least 4-6 hours) | Twice weekly during active growth | Mildly toxic to pets |
| Dahlia 'Cafe au Lait' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Penhill Dark Monarch' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Penhill Watermelon' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week, more during heat | 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 |
| 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 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 Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep substrate evenly moist at all times | Mildly toxic to pets |
| Darwin's barberry | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; drought-tolerant once established | Mildly toxic to pets |
| Darwin's Barberry | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days | 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 'Gold Rush' | Direct sun (at least 4-6 hours) | When the surface soil starts to dry; keep consistently moist, every 5-10 days | Mildly toxic to pets |
| Dawn Redwood 'Ogon' | Direct sun (at least 4-6 hours) | When the topsoil begins to dry; keep evenly moist, every 5-10 days | 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 |
| Day-blooming Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days; reduce in cooler or wet seasons | Toxic to pets |
| Daylily 'Autumn Minaret' | Direct sun (at least 4-6 hours) | Every 7-14 days during active growth; minimal in winter dormancy | Toxic to pets |
| Debao Cycad | Bright indirect light (just back from a sunny window) | Every 7–14 days; reduce in winter | Toxic to pets |
| 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 |
| Delphinium 'Black Knight' | Direct sun (at least 4-6 hours) | Every 3-5 days in growth; keep soil consistently moist, never dry | Toxic to pets |
| Delphinium 'Galahad' | Direct sun (at least 4-6 hours) | Every 3-5 days in growth; keep the soil consistently moist, never dry | Toxic to pets |
| Delphinium 'Pacific Giant' | Direct sun (at least 4-6 hours) | Keep consistently moist; water deeply 2-3 times weekly in growth | Toxic to pets |
| Dense Ginger Lily | Bright indirect light (just back from a sunny window) | Regularly through spring and summer; minimal in winter dormancy | Mildly toxic to pets |
| Dense Ginger Lily | 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 | Mildly toxic to pets |
| Dense-flowered Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter | Toxic to pets |
| Dense-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in summer, much less in winter | Pet-safe |
| 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 |
| Desert Bromeliad | Direct sun (at least 4-6 hours) | every 14–21 days in summer, rarely in winter | Pet-safe |
| Desert Rose | Direct sun (at least 4-6 hours) | Every 7-10 days in active growth; roughly monthly in winter dormancy | Toxic to pets |
| Deshojo Japanese Maple | Bright indirect light (just back from a sunny window) | Keep consistently moist; frequently daily in summer | Mildly toxic to pets |
| Deutzia 'Elegantissima' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season | Pet-safe |
| Deutzia 'Magnifica' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days during the growing season | Mildly toxic to pets |
| 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 |
| 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 Rose of Sharon | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| Dieffenbachia | Medium indirect light (a couple of metres from a window) | When the top 3 cm of soil is dry, every 7-10 days | 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 |
| Dieffenbachia Maculata Exotica | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dieffenbachia Memoria Corsii | 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 |
| Dieffenbachia Sterling | 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 |
| Digyna Sweet Box | Low light (north window or shaded room) | Every 10-14 days during the first two growing seasons; established plants are drought-tolerant and need watering only in extended dry spells | Mildly toxic to pets |
| 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 |
| Dipladenia | Direct sun (at least 4-6 hours) | Once or twice weekly in summer; every 10–14 days in winter | Mildly toxic to pets |
| Dipladenia (Mandevilla) | Direct sun (at least 4-6 hours) | Every 3-5 days in summer growth; sparingly in winter | Mildly toxic to pets |
| Dischor Wax Plant | Bright indirect light (just back from a sunny window) | When the top half of the mix is dry, roughly every 7–12 days in summer | Pet-safe |
| Diversifolia Wax Plant | Bright indirect light (just back from a sunny window) | Roughly every 1-2 weeks in spring and summer; less in autumn and winter | 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 |
| Don Juan Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, more in heat | Pet-safe |
| Doña Aurora | Direct sun (at least 4-6 hours) | Every 5–7 days; allow top 2–3 cm to dry slightly | Mildly toxic to pets |
| 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 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 |
| Downy Oak | Direct sun (at least 4-6 hours) | Rarely once established; weekly in first 1–2 years | 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 |
| 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 'Lemon Lime' | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 2-5 cm (1-2 in) of soil dry out first | Toxic to pets |
| Dracaena 'Song of India' | Bright indirect light (just back from a sunny window) | Roughly every 7–10 days in growth; let the top 2.5–5 cm of mix dry first. Water less in winter or low light. | 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 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 Dorado | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dracaena Deremensis Green Stripe | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, every 7-10 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 Deremensis Warneckii | 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 |
| 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 Fragrans Lindenii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dracaena Fragrans Massangeana | 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 |
| Dracaena Fragrans Sol | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Dracaena Fragrans Victoria | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, every 7-10 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 Laxissima | 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 |
| 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 Marginata Tricolor | 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 | 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 Steudneri | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 7-10 days | 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 |
| Dracaena Warneckii | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 2-5 cm (1-2 in) of soil dry out first | Toxic to pets |
| Dracontium gigas | Bright indirect light (just back from a sunny window) | Keep evenly moist in active growth; let the top 3-4 cm dry between waterings, then withhold once the leaf yellows for dormancy | Toxic to pets |
| Dracontium polyphyllum | Bright indirect light (just back from a sunny window) | When the top few cm of soil dry while in leaf; nearly dry when dormant | Toxic to pets |
| Dragon Tail Plant | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | 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 |
| 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 |
| 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 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 |
| 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 |
| 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 Birch | Direct sun (at least 4-6 hours) | Regular moisture; do not allow to dry out, especially in summer | Pet-safe |
| Dwarf Blue Lawson Cypress | Direct sun (at least 4-6 hours) | Regular during establishment (first 2 years), then moderate | Mildly 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 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 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 Coast Redwood | Direct sun (at least 4-6 hours) | Every 1–2 weeks; more in summer heat | Pet-safe |
| Dwarf Creeping Juniper | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly 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 Golden Oriental Arborvitae | Direct sun (at least 4-6 hours) | Moderate — weekly when young, reduced once established | Toxic to pets |
| Dwarf Hinoki Cypress | Direct sun (at least 4-6 hours) | Regular during establishment; moderate once established | Mildly toxic to pets |
| Dwarf Hinoki Cypress | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days depending on season | Mildly toxic to pets |
| Dwarf Jamaican Heliconia | Direct sun (at least 4-6 hours) | Every 2–3 days in growth, weekly in winter | Mildly toxic to pets |
| Dwarf Jamaican Heliconia | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water when only the top 1-2 cm dries, roughly every 4-6 days | Pet-safe |
| 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 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 Shell Ginger | Medium indirect light (a couple of metres from a window) | Regularly during the growing season; reduce in winter | Mildly 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 Sugar 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 in summer; every 14 days 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 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 |
| 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 Strobilanthes | Bright indirect light (just back from a sunny window) | 2–3 times weekly in summer; weekly in winter | Mildly toxic to pets |
| East Himalayan Fir | Direct sun (at least 4-6 hours) | Regularly during establishment; drought-tolerant once mature | Pet-safe |
| Easter Heliconia | Direct sun (at least 4-6 hours) | 2–3 times per week in summer, weekly in winter | Mildly toxic to pets |
| 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 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 |
| Eccremocarpus scaber | Direct sun (at least 4-6 hours) | Keep evenly moist through the growing season; water container plants regularly | Mildly toxic to pets |
| Echinops bannaticus 'Taplow Blue' | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water new plants until settled | Pet-safe |
| Echinopsis | Direct sun (at least 4-6 hours) | When the top few cm are dry, about every 1-2 weeks in summer; sparingly in winter | Toxic to pets |
| Ecuador Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (consistent moisture essential) | Toxic to pets |
| Edge of Night Heliconia | 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 summer | Mildly 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 |
| Egyptian Star Flower | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry | Mildly toxic to pets |
| Egyptian White Water Lily | Direct sun (at least 4-6 hours) | Permanently submerged aquatic — maintain 22–40 cm of water over the crown | Pet-safe |
| 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 |
| 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 ear | Bright indirect light (just back from a sunny window) | Soil should stay consistently moist during the growing season | Toxic to pets |
| Elephant Foot Yam | Bright indirect light (just back from a sunny window) | Freely when actively growing; stop completely once the leaf dies back | Toxic to pets |
| 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 |
| Elephant's Foot Pachypodium | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; withhold almost completely 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 |
| 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 |
| Embothrium coccineum | Direct sun (at least 4-6 hours) | Keep the root zone evenly moist; water every 5-10 days in dry or hot spells, particularly while establishing | Mildly toxic to pets |
| 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 Green Arborvitae | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days for young plants | 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 |
| Emory's Barrel Cactus | Direct sun (at least 4-6 hours) | Every 3-4 weeks in spring/summer; once a month or less in autumn; withheld almost entirely in winter | Mildly toxic to pets |
| 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 |
| Empress Wu Hosta | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days in growth | 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 |
| Encephalartos Villosus | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days in growth, reduced in winter | Toxic to pets |
| Encore Azalea 'Autumn Twist' | Bright indirect light (just back from a sunny window) | About 2-3 times per week while establishing, then weekly; water when the top 2-3 cm of soil is dry | Toxic to pets |
| 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 ivy | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 7-10 days | Toxic to pets |
| 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 |
| 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 amplissimum 'Silver Streak' | 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 |
| Epipremnum Aureum Global Green | 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 Aureum Harlequin | 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 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 Aureum Shangri-La | 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 Aureum Snow Queen | 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 |
| Epipremnum pinnatum 'Albo Variegata' | 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 Pinnatum Albo | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in growth; let the top 3-5 cm (1-2 in) dry first | 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 |
| Eranthemum pulchellum | 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 growth | Mildly toxic to pets |
| Erman's Birch | Direct sun (at least 4-6 hours) | Regular watering for first 2–3 years; occasional once established | Pet-safe |
| Ethiopian Banana | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 4-6 days during warm months | Pet-safe |
| Etruscan honeysuckle | Direct sun (at least 4-6 hours) | Weekly during dry spells; established plants are drought-tolerant | Mildly toxic to pets |
| Eucryphia × nymansensis 'Nymansay' | Direct sun (at least 4-6 hours) | Keep the root zone consistently moist; water every 5-10 days in dry or hot weather, especially while establishing | Mildly 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 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 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 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 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 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 persistentifolia | Direct sun (at least 4-6 hours) | When the soil is dry, about every 1-2 weeks in summer; sparingly in winter | 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 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 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 |
| 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 Chain Fern | Medium indirect light (a couple of metres from a window) | 3-4 times per week in growing season; reduce slightly in winter | Mildly toxic to pets |
| European Cypress (Goldcrest Lemon Cypress) | Direct sun (at least 4-6 hours) | When the top 2-3cm (1 inch) of mix is dry | 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 Hornbeam | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil begins to dry, often daily in summer | Mildly toxic to pets |
| 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 |
| 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 |
| Extended Alcantarea | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in summer; every 3–4 weeks in winter | 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 |
| Fadang | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; every 3–4 weeks in winter | 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 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 |
| 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 Aralia | 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 |
| 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 |
| Falstaff 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 |
| Fanged Pitcher Plant | Bright indirect light (just back from a sunny window) | Regularly — maintain consistently moist medium | Mildly toxic to pets |
| 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 |
| Faulkner box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Featherleaf Rodgersia 'Superba' | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply 2-3 times per week in dry spells, more in summer heat | Mildly toxic to pets |
| 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 |
| Felicia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during the growing season, more often in hot weather | Pet-safe |
| 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 |
| 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 |
| Few-Flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; reduce to every 3–4 weeks in winter | Pet-safe |
| Ficus Abidjan (burgundy rubber 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 |
| 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 Audrey | 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 |
| Ficus Melany (compact rubber plant) | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Ficus microcarpa | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, often every 4-7 days indoors | 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 |
| Ficus Tineke (variegated rubber plant) | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Fiddle leaf fig | Bright indirect light (just back from a sunny window) | When the top 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 |
| Field Bindweed | Direct sun (at least 4-6 hours) | Low — extremely drought-tolerant once established | Toxic to pets |
| Field Elm Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil starts to dry, often daily in warm weather | 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 |
| Finlaysonii Wax Plant | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top half of the mix dry out first | Pet-safe |
| Fire Barrel Cactus | Direct sun (at least 4-6 hours) | Every 3-4 weeks in the growing season (spring–summer); once every 6-8 weeks in autumn; almost none in winter | Mildly 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 |
| Firebush | Direct sun (at least 4-6 hours) | Weekly until established; every 10–14 days once mature | Mildly toxic to pets |
| 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 |
| 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 |
| Firethorn Bonsai | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil begins to dry, often daily in summer heat | Mildly toxic to pets |
| Fischer's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in summer, every 3–4 weeks 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 |
| Fishhook Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Fishtail palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 5-7 days | Mildly toxic to pets |
| 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 |
| 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-Fingers Syngonium | 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 in summer and 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 |
| Five-Nerved Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days during active growth; every 14-21 days in winter | Pet-safe |
| Flaky Juniper | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly during establishment year | 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 |
| Flamingo pieris | Bright indirect light (just back from a sunny window) | Weekly during dry weather | Toxic to pets |
| 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-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 |
| Florida Beauty | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Florida Ghost | 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 |
| 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 |
| Florida Silver Palm | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Florida Torreya | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Flowering Banana | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 5-7 days in growing season | 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 maple | Direct sun (at least 4-6 hours) | When the top 1 cm (½ inch) of mix is dry, often every few days in summer | Mildly toxic to pets |
| 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 |
| Footstool 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 | Mildly toxic to pets |
| Forest Elephant's Foot | Bright indirect light (just back from a sunny window) | Every 1–2 weeks during active growth (autumn to spring); withhold almost entirely in summer dormancy | Mildly toxic to pets |
| Forest Epipremnum | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 8-12 days | Toxic to pets |
| Forest Flame pieris | Bright indirect light (just back from a sunny window) | Weekly during dry periods | Toxic to pets |
| Forest Flame Pieris | Bright indirect light (just back from a sunny window) | Every 7-10 days in the growing season; established plants roughly every 10-14 days, more frequently during dry spells | 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 |
| Forest Spurflower | Medium indirect light (a couple of metres from a window) | Every 7-10 days in the growing season; every 14-21 days in winter | Mildly toxic to pets |
| Formosa Lily | Direct sun (at least 4-6 hours) | 2-3 times per week in active growth | Toxic to pets |
| Forrest Fir | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry for young trees, roughly every 10-14 days during establishment | Mildly toxic to pets |
| Forrest Ginger Lily | 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 |
| Forrest's Ginger Lily | Bright indirect light (just back from a sunny window) | Generously and consistently through spring and summer | Mildly toxic to pets |
| Forrest's pieris | Bright indirect light (just back from a sunny window) | Regular; do not allow to dry out | Toxic to pets |
| 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 |
| Forsythia Sage | Bright indirect light (just back from a sunny window) | Weekly during active growth | Pet-safe |
| Fortune Plum Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, roughly every 10-14 days in the growing season | Toxic to pets |
| 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 |
| 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 |
| Fourth of July Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, more during heat | Pet-safe |
| Foxglove | Bright indirect light (just back from a sunny window) | Regularly — weekly in summer, less in winter | Toxic to pets |
| Foxglove 'Camelot Lavender' | Bright indirect light (just back from a sunny window) | Once or twice a week in dry conditions, ensuring even moisture during flower spike development | Toxic to pets |
| Foxglove 'Camelot' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water weekly in dry weather | Toxic to pets |
| Foxglove Sage | Bright indirect light (just back from a sunny window) | Regular — keep soil evenly moist but not saturated | Mildly 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 |
| 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 Sweet Box | Low light (north window or shaded room) | Every 10-14 days during establishment; established plants are very drought-tolerant and require watering only during prolonged dry periods | Mildly toxic to pets |
| Franchet Cotoneaster | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days | Mildly toxic to pets |
| Fraser Fir | Direct sun (at least 4-6 hours) | Regularly; moist but well-drained | Mildly toxic to pets |
| French Tamarisk | Direct sun (at least 4-6 hours) | Moderate; drought-tolerant once established | Pet-safe |
| Fruit-scented Sage | Direct sun (at least 4-6 hours) | When the top 3-5 cm of compost is dry — roughly every 5-8 days in summer, less often in winter | Pet-safe |
| Fuchsia 'Gartenmeister Bonstedt' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 3-5 days in warm weather | Pet-safe |
| Fuchsia 'Mrs Popple' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost is dry, roughly every 3-5 days during active growth | Pet-safe |
| Fuchsia magellanica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 3-5 days in summer heat | Pet-safe |
| Fuerte Avocado | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, about every 5-7 days in warm growth | Toxic to pets |
| 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 |
| Gamboge | Direct sun (at least 4-6 hours) | Twice weekly; more frequently in hot weather | Mildly toxic to pets |
| Gamboge Tree | Bright indirect light (just back from a sunny window) | Water moderately and consistently; do not allow to dry out between waterings. | Mildly toxic to pets |
| Garden Gladiolus | Direct sun (at least 4-6 hours) | Weekly deep watering during active growth; reduce after flowering; cease after first frost kills foliage | Toxic to pets |
| Gardenia | Bright indirect light (just back from a sunny window) | When the top 2-3cm of compost feels dry | 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 |
| Garlic Vine | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce in winter | Mildly toxic to pets |
| Geay's Pachypodium | Direct sun (at least 4-6 hours) | When the top half of the soil is dry during the growing season, roughly every 7-14 days in summer; minimal to none in winter | 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 |
| 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 |
| Gesneria-flowered Sage | Direct sun (at least 4-6 hours) | Regular during the growing season | Pet-safe |
| Giant Arrowhead | Direct sun (at least 4-6 hours) | Permanently aquatic — plant in still or slow-moving water 10–15 cm (4–6 in) deep; tolerates up to 30 cm (12 in). | Pet-safe |
| 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 Bellflower | Medium indirect light (a couple of metres from a window) | Regularly — keep soil consistently moist throughout the growing season | Pet-safe |
| Giant Chain Fern | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil begins to dry, roughly every 5-8 days in summer | 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 Dioon | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in summer; every 3–4 weeks in winter | 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 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 Fishtail Palm | Direct sun (at least 4-6 hours) | Regularly; keep soil moderately moist | Mildly toxic to pets |
| Giant Fishtail Palm | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, often every 5-7 days in active growth | Toxic to pets |
| Giant Ginger Lily | Direct sun (at least 4-6 hours) | Generously during active growth; reduce markedly in autumn and winter | Pet-safe |
| 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 Montbretia | Direct sun (at least 4-6 hours) | Every 7-10 days in the growing season; reduce to occasional watering once foliage yellows in autumn | Mildly toxic to pets |
| Giant Pineapple Lily | Direct sun (at least 4-6 hours) | Regular during the growing season; minimal in winter dormancy | Toxic to pets |
| Giant Pineapple Lily | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry during active growth, roughly every 7-14 days | Toxic to pets |
| Giant Plume Ginger | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during active growth | Mildly toxic to pets |
| 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 Sea Holly | Direct sun (at least 4-6 hours) | Moderate — water regularly to keep soil evenly moist, especially in summer | Pet-safe |
| Giant Sequoia | Direct sun (at least 4-6 hours) | Weekly while establishing; deep occasional soaks once mature | Mildly toxic to pets |
| Giant Sequoia 'Blauer Eichzwerg' | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry; keep evenly moist, every 7-10 days | 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 South American Bamboo | Bright indirect light (just back from a sunny window) | Weekly to twice weekly during active growth; reduce in winter | Pet-safe |
| Giant Spider Lily | 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 the growing season | Toxic to pets |
| Giant Staghorn Fern | Bright indirect light (just back from a sunny window) | Soak when the mount or root mass is approaching dry, roughly every 7-14 days | Pet-safe |
| Giant Sunburst Lotus | Direct sun (at least 4-6 hours) | Aquatic — continuously in still or gently moving water | Mildly toxic to pets |
| Giant Taro | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm is dry, often every 4-7 days | 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 Water Lily | Direct sun (at least 4-6 hours) | Permanently submerged — maintain 40–80 cm of water over the crown | Mildly toxic to pets |
| 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 |
| Giant White Bird of Paradise | Bright indirect light (just back from a sunny window) | When the top 5–7 cm of soil feel dry; approximately every 7–14 days in summer, less in winter | Toxic to pets |
| Giant White Bird of Paradise | Bright indirect light (just back from a sunny window) | When the top 4-5 cm of soil is dry, roughly every 7-14 days | Mildly toxic to pets |
| Giant Wild Pine | Bright indirect light (just back from a sunny window) | Weekly soak or twice-weekly misting | Pet-safe |
| 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 |
| 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 |
| 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 |
| Glenn Mango | Direct sun (at least 4-6 hours) | Deep soak when the top few centimetres of soil dry, about every 5-10 days in growth | 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-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 Bower | 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 |
| Glossy Abelia | Direct sun (at least 4-6 hours) | Regularly during the first growing season; occasional deep watering once established | Pet-safe |
| Goeppertia majestica | 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 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 |
| 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 Dracaena | 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 |
| Gold Rush Dawn Redwood | Direct sun (at least 4-6 hours) | Regularly — keep soil consistently moist, especially in summer | Pet-safe |
| Gold Rush Dawn Redwood | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days in summer | Mildly toxic to pets |
| 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 Chalice Vine | Direct sun (at least 4-6 hours) | Weekly in active growth; every 2–3 weeks in winter | Toxic to pets |
| Golden Deodar Cedar | Direct sun (at least 4-6 hours) | Moderately; regularly during establishment, infrequently once mature | Mildly toxic to pets |
| Golden Deodar Cedar | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| Golden Dragon | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Golden Glow bougainvillea | Direct sun (at least 4-6 hours) | Every 7–14 days during growth; reduce for 3–4 week dry cycles to trigger bract flush | Mildly toxic to pets |
| Golden Goddess Bamboo | Direct sun (at least 4-6 hours) | Twice weekly during dry periods in summer; reduce to weekly or less in cooler seasons | 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 Ctenanthe | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (about an inch) of soil feels dry, roughly weekly in summer and less in winter | Mildly toxic to pets |
| Golden pothos | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Golden Rat Tail Cactus | 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 summer and every 3-4 weeks in winter | Pet-safe |
| Golden Spreader Nordmann Fir | Bright indirect light (just back from a sunny window) | Regularly; maintain moist but not wet soil | Mildly toxic to pets |
| Golden Tree Fern | Bright indirect light (just back from a sunny window) | 2-3 times per week; trunk must stay moist | Pet-safe |
| Golden Tree Fern | Bright indirect light (just back from a sunny window) | Keep consistently moist; water when the top 3-5 cm of soil feels dry or when trunk feels dry to the touch, roughly every 3-7 days in summer | Pet-safe |
| Golden Trumpet | Direct sun (at least 4-6 hours) | When the top 2-5 cm of soil is dry (roughly weekly in summer) | Mildly toxic to pets |
| 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-rayed Lily | Direct sun (at least 4-6 hours) | When top 3 cm of soil is dry | 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 |
| 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 |
| Goldfussia | Bright indirect light (just back from a sunny window) | 2–3 times weekly in spring and summer; reduce slightly in winter | 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 Cattail | Direct sun (at least 4-6 hours) | Continuously moist to submerged | 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 |
| Graham Thomas Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| 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 Ivy | Bright indirect light (just back from a sunny window) | When the top 1 inch (2.5 cm) of soil is dry | Pet-safe |
| Grape-leaved passionflower | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth | Mildly toxic to pets |
| Grapeleaf Abutilon | Direct sun (at least 4-6 hours) | Moderate; established plants are fairly drought-tolerant | Mildly toxic to pets |
| Graptophyllum pictum | 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 warm growth | Mildly toxic to pets |
| Grass-Leaved Ginger | Direct sun (at least 4-6 hours) | 2–3 times per week during active growth; reduce to once a week or less in winter | Mildly toxic to pets |
| Gray Birch | Direct sun (at least 4-6 hours) | Moderate; tolerates drier conditions than most birches once established | Pet-safe |
| Gray Organ Pipe | Direct sun (at least 4-6 hours) | When the top half of soil is dry, roughly every 10-14 days in summer; very infrequently in winter | 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 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 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 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 Fir | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; rarely needed once mature | Pet-safe |
| Green Ash | Direct sun (at least 4-6 hours) | Weekly when establishing; drought-tolerant once mature | Pet-safe |
| Green Glaucous Bamboo | Direct sun (at least 4-6 hours) | Twice weekly during establishment; every 7–14 days once mature | 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 Sapote | Direct sun (at least 4-6 hours) | Every 7–10 days; allow partial drying between irrigations | 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's Ginger Lily | Bright indirect light (just back from a sunny window) | Keep consistently moist during active growth (spring to autumn); reduce watering in winter dormancy | 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 |
| Grey Club-rush | Direct sun (at least 4-6 hours) | Shallow to moderately deep aquatic; 10–60 cm over the crown | 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 |
| Grumichama | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil dries, roughly weekly; keep young plants evenly moist | 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 |
| Guariroba Palm | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| 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 |
| guelder rose | Bright indirect light (just back from a sunny window) | Weekly when young; every 1–2 weeks once established | Mildly toxic to pets |
| Gum Palm | Bright indirect light (just back from a sunny window) | When the top 4-5 cm of mix is dry, every 8-12 days in growth | 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 |
| Guriri Palm | 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 the growing season | 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 |
| Hackberry Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil dries, regularly in summer | Mildly toxic to pets |
| Hairy Abutilon | Bright indirect light (just back from a sunny window) | Regularly; keep soil evenly moist in growth | 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 Sage | Direct sun (at least 4-6 hours) | Moderate; water when the top 3–5 cm of soil is dry | Mildly toxic to pets |
| Hairy Spiral Ginger | Medium indirect light (a couple of metres from a window) | Frequent — keep soil consistently moist throughout the growing season, reducing slightly in winter. | Mildly toxic to pets |
| Hairy Sun Rose | Direct sun (at least 4-6 hours) | Very low — once every 3–4 weeks in the growing season once established | Mildly toxic to pets |
| 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 Totara | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days for young plants | Toxic to pets |
| Hamilton's Strobilanthes | Medium indirect light (a couple of metres from a window) | 2–3 times weekly in summer; once weekly in winter | Mildly toxic to pets |
| Hanging Heliconia | 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 warm weather | Mildly toxic to pets |
| Hanging Lobster Claw | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water when only the top 1-2 cm dries, roughly every 3-5 days in warm conditions | Pet-safe |
| Hansa Rose | Direct sun (at least 4-6 hours) | Water weekly while establishing; drought-tolerant once settled | Pet-safe |
| Happy Wanderer | Bright indirect light (just back from a sunny window) | Low to moderate; drought tolerant once established | 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 |
| Hartford Climbing 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 in active growth | Pet-safe |
| Hass Avocado | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, roughly every 5-7 days in warm growth | Toxic to pets |
| 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 |
| Hatschbach's Fuchsia | Bright indirect light (just back from a sunny window) | Water freely in growth; keep just moist in winter | Pet-safe |
| Hawaiian Tree Fern | Bright indirect light (just back from a sunny window) | 2-3 times per week in growing season, reduce in winter | Pet-safe |
| Hayata's Stephania | Bright indirect light (just back from a sunny window) | Every 7–10 days during growing season; withhold in winter dormancy | Toxic to pets |
| Hazel Smith Sequoia | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| Heart of Fire Bromeliad | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in summer | Mildly toxic to pets |
| 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-leaf Fan Palm | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil feels dry | Pet-safe |
| Heartleaf Hornbeam | Medium indirect light (a couple of metres from a window) | Moderate; water regularly when young; maintain consistent moisture | Pet-safe |
| Heartleaf philodendron | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| 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 |
| Hedera canariensis | 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 |
| Hedera colchica | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 6-8 days in growth | 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 |
| Hedera helix 'Glacier' | 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 |
| Hedera helix 'Goldheart' | 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 |
| 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 |
| Helenium 'Chipperfield Orange' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days during dry periods | Toxic to pets |
| Helenium 'Riverton Beauty' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in warm, dry weather | Toxic to pets |
| Helianthus 'Lemon Queen' | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Helianthus × multiflorus 'Loddon Gold' | Direct sun (at least 4-6 hours) | About once or twice a week, keeping soil moist in summer | Pet-safe |
| Helianthus decapetalus 'Flore Pleno' | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| 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 |
| Hemisphere Torch Ginger | Bright indirect light (just back from a sunny window) | 2–3 times per week | Mildly toxic to pets |
| Hemisphere Torch Ginger | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 5-7 days in the growing season; reduce to every 10-14 days during cooler months | Mildly toxic to pets |
| Hemlock Water Dropwort | Direct sun (at least 4-6 hours) | Constantly wet; wetland marginal or in-water species | Toxic to pets |
| Henderson's Allamanda | Direct sun (at least 4-6 hours) | Every 5–7 days during active growth; sparingly in winter | Toxic to pets |
| 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 Lily | Bright indirect light (just back from a sunny window) | Regular during growth, approximately every 7–10 days in dry weather; reduce after dormancy | 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 Trumpet Vine | Direct sun (at least 4-6 hours) | Water every 5-7 days in the growing season, ensuring the top 3-5 cm is slightly dry before watering; reduce significantly in winter to every 2-4 weeks | Mildly toxic to pets |
| Herald's Trumpet | Direct sun (at least 4-6 hours) | Every 5-7 days in growth, every 14 days in winter | Toxic to pets |
| 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 |
| 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 | Direct sun (at least 4-6 hours) | Deep watering every 5-7 days, more in heat | Pet-safe |
| Hibiscus rosa-sinensis 'Cooper' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 3-5 days in active growth | Pet-safe |
| 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 |
| Hilde's Air Plant | Bright indirect light (just back from a sunny window) | Daily misting in warm weather; 2–3 times per week in winter. | Mildly toxic to pets |
| Hildebrandt Ravenea | 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 |
| Himalayan Cotoneaster | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; established plants are drought-tolerant once settled | 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 | Bright indirect light (just back from a sunny window) | Regular; keep consistently moist | 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 mix is mostly dry, every 10-14 days or longer | Pet-safe |
| Hinoki 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 |
| 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 |
| Hogweed | Bright indirect light (just back from a sunny window) | Regular during establishment; drought-tolerant once established | Mildly toxic to pets |
| Hohenbergia stellata | Bright indirect light (just back from a sunny window) | Keep the central tank filled; water the mix when its top 3-4 cm is dry | Pet-safe |
| 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 |
| 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 'Maggy' (Shield Plant) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (top inch) of soil is dry | Toxic to pets |
| 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 |
| 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 Ginger Lily | Bright indirect light (just back from a sunny window) | Consistently moist in active growth (spring–autumn); reduce significantly in winter | 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 |
| 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 |
| Horstmann Korean Fir | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Hosta 'Blue Angel' | Medium indirect light (a couple of metres from a window) | Every 5-7 days during the growing season, or when the top 3-5 cm of soil is drying | Toxic to pets |
| Hosta 'Blue Mammoth' | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Hosta 'Empress Wu' | 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 during the growing season | Toxic to pets |
| Hosta 'Sagae' | 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 the growing season | Toxic to pets |
| Hosta 'Sum and Substance' | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, about every 5-7 days; more in heat | 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 'Krimson Princess' | Bright indirect light (just back from a sunny window) | When the top half of the mix is dry, every 7-14 days | Pet-safe |
| Hoya 'Krimson Queen' | Bright indirect light (just back from a sunny window) | When the top half of the mix is dry, every 7-14 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 'Sunrise' | 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 Acuta | 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 Aldrichii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya Archboldiana | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Australis | Bright indirect light (just back from a sunny window) | when top 2-3 cm of soil dries | Pet-safe |
| Hoya Australis 'Lisa' | Bright indirect light (just back from a sunny window) | Roughly every 1-2 weeks; only when the top 1-2 inches of soil are dry | Pet-safe |
| Hoya Blashernaezii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Burtoniae | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of mix is dry, roughly every 7-10 days | 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 callistophylla | Bright indirect light (just back from a sunny window) | Roughly every 7-14 days in spring/summer, less in winter | Pet-safe |
| Hoya Calycina | 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 Campanulata | 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 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 Carnosa Tricolor | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top inch dry out | Pet-safe |
| Hoya Carnosa Variegata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, about 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 Celata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Chouke | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Cinnamomifolia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Clemensiorum | 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 |
| 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 Danumensis | 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 Deykeae | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-10 days in growth | 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 Elliptica | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya Erythrina | 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 Erythrostemma | 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 Fitchii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-12 days | 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 Flavida | 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 Fraterna | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-14 days in growth | Pet-safe |
| Hoya fungii | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of mix are dry, roughly every 1-2 weeks | Pet-safe |
| Hoya Fusca | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya Gracilipes | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 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 Griffithii | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Halconensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Imperialis | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-10 days | 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 Javanica | 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 kentiana | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the mix dry out between waterings | Pet-safe |
| Hoya Krimson Queen | Bright indirect light (just back from a sunny window) | Roughly every 1-2 weeks; let the top 1-2 inches (or more) of soil dry first | 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 Latifolia | 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 Lauterbachii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya Leucorhoda | 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 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 Loyceandrewsiana | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-14 days in growth | Pet-safe |
| Hoya Macrophylla 'Variegata' | 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 Mappigera | 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 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 Micrantha | 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 Mindorensis | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-10 days | 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 Nicholsoniae | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Nummularia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Obovata | Bright indirect light (just back from a sunny window) | When the top half of the mix is dry | Pet-safe |
| Hoya Odorata | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-10 days | 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 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 Pandurata | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 7-12 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 Potsii | 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 Praetorii | 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 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 | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 7-10 days in summer | 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 Pubicalyx 'Splash' | 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 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 Rosarioae | 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 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 Rotundiflora Variegata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Sarawakensis | 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 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 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 Sipitangensis | 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 Solaniflora | 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 Subcalva | 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 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 Sussuela | 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 Telosmoides | 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 Tsangii | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| Hoya Undulata | 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 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 |
| Hoya Wallichii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-10 days in growth | Pet-safe |
| Hoya Walliniana | 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 |
| 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 Lilac | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| 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 | Bright indirect light (just back from a sunny window) | Deep watering 1-2 times per week, more in heat | 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 'Annabelle' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days; more frequently in hot weather | Mildly toxic to pets |
| Hydrangea 'Endless Summer' | Bright indirect light (just back from a sunny window) | Keep consistently moist; water deeply 2-3 times weekly in heat | Toxic to pets |
| Hydrangea 'Endless Summer' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 2-3 times weekly in summer heat, more for containers | Toxic to pets |
| Hydrangea 'Incrediball' | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, about 2-3 times per week in summer | 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 'Limelight' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Mildly 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 'Nikko Blue' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 5-7 days during the growing season | Mildly toxic to pets |
| Hydrangea 'Pee Gee' | 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 |
| 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 'Quick Fire' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season | Mildly toxic to pets |
| Hydrangea 'Snowflake' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Hydrangea 'Strawberry Sundae' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season | Mildly toxic to pets |
| Hydrangea 'Tardiva' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Mildly 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 |
| 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 Cream Bean | Direct sun (at least 4-6 hours) | Deeply once or twice a week; reduce in cooler months | Mildly toxic to pets |
| Iceberg Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Ilama | Direct sun (at least 4-6 hours) | Deeply every 7-10 days in the growing season; reduce sharply in the dry/cool dormant period | Mildly toxic to pets |
| Impala Lily | Direct sun (at least 4-6 hours) | Every 7–10 days in warm growing season; withhold almost entirely during dormancy (autumn–late winter) | Toxic to pets |
| 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 |
| Indian Fig Opuntia | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | Pet-safe |
| 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 Shot | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days | 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 |
| Indonesian Wax Ginger | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil becomes dry, roughly every 5-7 days | 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 lobata | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-6 days in summer | Toxic to pets |
| Ipomoea nil 'Scarlett O'Hara' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 3-5 days in summer | Toxic to pets |
| Ipomoea purpurea | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 3-5 days in summer heat | 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 pseudacorus | Direct sun (at least 4-6 hours) | Permanently wet; thrives in 0-30 cm of standing water | Toxic to pets |
| Irish Ivy | Low light (north window or shaded room) | Water every 7-14 days during establishment; established plants are drought-tolerant and rarely need supplemental irrigation | Toxic to pets |
| 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 |
| 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 |
| Ivory Cane Palm | 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 |
| Ivory Sea Holly | Direct sun (at least 4-6 hours) | Moderate — water regularly during the growing season; reduce 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-leaved scindapsus | Medium indirect light (a couple of metres from a window) | Every 7–14 days depending on season and light | Toxic to pets |
| Ivyleaf morning glory | Direct sun (at least 4-6 hours) | Once or twice a week; allow soil to dry slightly between waterings | Toxic to pets |
| Jaboticaba | Direct sun (at least 4-6 hours) | Keep consistently moist; water when the top 3-4 cm of soil dries, often 1-2 times weekly | Mildly 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 |
| Jacaranda Tree Succulent | Direct sun (at least 4-6 hours) | Every 7–10 days in summer (when leafed out); once a month or not at all in winter dormancy | Mildly 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 |
| Jacobinia Carnea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, typically every 4-7 days in growth | Mildly toxic to pets |
| Jacqueline Postill Daphne | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in the growing season, allowing the top 3-5 cm to dry between waterings | 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 |
| 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 |
| Japanese Anemone 'Honorine Jobert' | 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 |
| Japanese Apricot | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil dries, often daily in summer | 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 Banana | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 4-6 days in active growth | 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 | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is approaching dry, often daily in summer heat | Mildly toxic to pets |
| 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 Black Pine 'Thunderhead' | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry; allow slight drying between waterings | 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 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 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 'Globosa Nana' | Direct sun (at least 4-6 hours) | Keep evenly moist; weekly in dry weather, more in containers | 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 Cedar Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil starts to dry, often daily in summer | Mildly toxic to pets |
| Japanese Climbing Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of soil is dry, roughly weekly | Mildly toxic to pets |
| Japanese Cornel Dogwood | Direct sun (at least 4-6 hours) | Regular watering while establishing; drought-tolerant once mature | Pet-safe |
| Japanese Flowering 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 |
| Japanese Garden Juniper | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is just dry, frequently in summer | Toxic to pets |
| Japanese Holly 'Sky Pencil' | Bright indirect light (just back from a sunny window) | When the top few centimetres of soil dry; about weekly in summer | Toxic to pets |
| Japanese Hornbeam | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil starts to dry, often daily in summer | Mildly toxic to pets |
| 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 Laurel | Low light (north window or shaded room) | Once per week indoors; allow top 2–5 cm (1–2 in) of soil to dry between waterings | Mildly toxic to pets |
| Japanese Maple | 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 | 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 Maple 'Tamukeyama' | Bright indirect light (just back from a sunny window) | One to two deep waterings per week when growing | Pet-safe |
| Japanese morning glory | Direct sun (at least 4-6 hours) | 2–3 times per week in containers; once a week in garden beds during dry spells | 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 Pepper Vine | Medium indirect light (a couple of metres from a window) | When the top 2–3 cm of soil dry out, approximately every 5–7 days | 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 Pieris 'Forest Flame' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water weekly during dry spells, more in containers | Toxic to pets |
| Japanese Pieris 'Mountain Fire' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry; keep evenly moist, particularly while establishing | Toxic to pets |
| Japanese Pieris Flamingo | Bright indirect light (just back from a sunny window) | Water deeply every 7–10 days; more frequently in hot, dry spells | 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 Royal Fern | Medium indirect light (a couple of metres from a window) | Frequently — keep soil constantly moist | Pet-safe |
| Japanese Show Lily | Bright indirect light (just back from a sunny window) | Regular during active growth, roughly every 5–7 days in dry spells; reduce after foliage dies back | Toxic to pets |
| 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 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 | Direct sun (at least 4-6 hours) | Every 7-14 days during the first two seasons; drought-tolerant once established | 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 |
| Japanese Witch Hazel | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days in the growing season | Pet-safe |
| Japanese Zelkova | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil starts to dry, often daily in summer | Mildly toxic to pets |
| Jasmine (Pink Jasmine) | Bright indirect light (just back from a sunny window) | When the top 2-3cm of soil feels dry, roughly weekly in growth | Pet-safe |
| 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 |
| Jasminum sambac 'Grand Duke of Tuscany' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days in growth | Pet-safe |
| Jasminum sambac 'Maid of Orleans' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days in warm growth | 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 |
| Jeddeloh Hemlock | Bright indirect light (just back from a sunny window) | Regular — do not allow to dry out | 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 |
| Jelena Witch Hazel | Bright indirect light (just back from a sunny window) | Deeply once or twice a week during the first growing season; established plants roughly every 10-14 days or as the top 5 cm dries | 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 |
| Jenkins Fan 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 in growing season | 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 |
| 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 |
| Johnston's Cyrtosperma | Bright indirect light (just back from a sunny window) | Keep permanently moist to waterlogged; does not tolerate drought | Toxic to pets |
| 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 |
| Jungle Geranium | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil feels dry, roughly 1-2 times per week in growth | Pet-safe |
| 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 |
| Justicia aurea | 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 warm growth | Mildly toxic to pets |
| Kaapsehoop Cycad | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in summer; every 3–4 weeks in winter | Toxic to pets |
| Kahili Ginger | Bright indirect light (just back from a sunny window) | Water freely in spring and summer (every 3–5 days); reduce sharply in autumn and keep barely moist over winter | Mildly 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 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 |
| 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 |
| Karatas Bromeliad | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in growing season | Mildly toxic to pets |
| 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 |
| Karl Foerster Reed Grass | Bright indirect light (just back from a sunny window) | Every 7-14 days during the first season; established plants need water only in prolonged drought | 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 |
| Kaurima Pyrenacantha | Medium indirect light (a couple of metres from a window) | Every 7–14 days in the growing season; monthly or less in winter | Mildly toxic to pets |
| Keiske's Leucothoe | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season, less in winter | Toxic to pets |
| Keitt Mango | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil dries during growth; reduce before flowering | Mildly toxic to pets |
| Kent Mango | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil dries in growth; reduce in the cool/dry rest period | Mildly toxic to pets |
| 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 |
| Kiftsgate Rose | Direct sun (at least 4-6 hours) | Deep weekly soak while establishing; little needed once mature | Pet-safe |
| King Anthurium | Bright indirect light (just back from a sunny window) | when top 2-3 cm dry | Toxic to pets |
| 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 Palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| 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 |
| Klotzsch's Parlour Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Knap Hill Scarlet quince | Bright indirect light (just back from a sunny window) | Weekly when establishing; monthly once established | Mildly toxic to pets |
| Kneed Alcantarea | Bright indirect light (just back from a sunny window) | Refill the large central cup every 5-7 days; water the medium sparingly only when the top 4-5 cm is dry, roughly every 14-21 days | Pet-safe |
| 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 |
| Kokum | Direct sun (at least 4-6 hours) | Water regularly to keep soil consistently moist; do not allow to dry out. | 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 Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; moderately drought-tolerant once mature | Pet-safe |
| Korean Hornbeam | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil starts to dry, often daily in summer | Mildly toxic to pets |
| Korean Hornbeam Bonsai | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil starts to dry, often daily in summer | Mildly toxic to pets |
| 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 |
| Krossa Regal 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 |
| 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 |
| Kuril Bamboo | Medium indirect light (a couple of metres from a window) | 2-3 times per week in growing season; weekly in winter | 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-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 |
| Laceleaf Japanese Maple 'Crimson Queen' | Bright indirect light (just back from a sunny window) | Deeply once or twice a week in the growing season, more in heat | 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 of Shalott 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 |
| 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 palm | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Pet-safe |
| Lamb Hass Avocado | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, roughly every 5-7 days in warm growth | Toxic to pets |
| Langsat | Bright indirect light (just back from a sunny window) | 2–3 times per week; more frequently in dry season | 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 |
| Laos Lady Palm | 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 |
| Laos Lady Palm | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil dries out, roughly every 7-10 days | Pet-safe |
| Lasia spinosa | Bright indirect light (just back from a sunny window) | Keep constantly wet to waterlogged | 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 |
| 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 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 |
| 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 |
| Leatherleaf | Bright indirect light (just back from a sunny window) | Consistently wet to moist — never allow to dry out | 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 |
| Leloja Kedrostis | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; very sparingly in winter | Mildly toxic to pets |
| 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 Drop Mangosteen | Direct sun (at least 4-6 hours) | Water regularly; requires consistently moist soil and high annual rainfall equivalent. | Mildly toxic to pets |
| Leopard 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 |
| Leopard Plant 'The Rocket' | Medium indirect light (a couple of metres from a window) | Every 3-5 days or more frequently in warm weather; soil should remain consistently moist | Mildly toxic to pets |
| Lepidozamia Peroffskyana | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days in growth, less in winter | Toxic to pets |
| Lesser Shell Ginger | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer; reduce in cooler months | Mildly 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 |
| Licuala Orbicularis | Low light (north window or shaded room) | Keep consistently moist; water when the surface just begins to dry | Mildly toxic to pets |
| Licuala Peltata | Bright indirect light (just back from a sunny window) | Keep evenly moist; water as the top 2-3 cm of soil dries | Mildly toxic to pets |
| Licuala Spinosa | Bright indirect light (just back from a sunny window) | Keep consistently moist; water when the top 2-3 cm of soil begins to dry | Mildly toxic to pets |
| Licuri Palm | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days or less | Pet-safe |
| Light Yellow Shell Ginger | 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 the growing season | 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 Trumpet Vine | Direct sun (at least 4-6 hours) | Water every 7-10 days during the growing season, allowing the top 3-5 cm to dry slightly between waterings; reduce to every 2-3 weeks in cooler months | Mildly toxic to pets |
| 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 'Conca d'Or' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, about weekly during growth | 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 |
| Lilium lancifolium | Direct sun (at least 4-6 hours) | Keep evenly moist in active growth, roughly weekly; never waterlogged | Toxic to pets |
| Lily Magnolia | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduce in autumn and winter | 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 |
| Lipstick Palm | Bright indirect light (just back from a sunny window) | Keep soil consistently moist — check every 3-4 days; water whenever the surface begins to dry | 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 |
| Little Gem Magnolia | Direct sun (at least 4-6 hours) | Weekly while establishing (1–3 years); deep watering in summer drought thereafter | 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 |
| Livistona Rotundifolia | 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 |
| 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 |
| Loblolly Pine Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, commonly daily in summer and every 3-5 days in cool weather | Pet-safe |
| Lobster Claw Heliconia | Bright indirect light (just back from a sunny window) | Every 5–7 days; maintain consistently moist soil | Mildly toxic to pets |
| Long-Flowered Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during the growing season; fortnightly in winter | Toxic to pets |
| Long-Horned Ginger Lily | Bright indirect light (just back from a sunny window) | Water frequently during active growth, allowing the medium to drain thoroughly after each watering; reduce in cooler months | 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 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-Stalked Pothos | 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 |
| 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 |
| 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 japonica | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, around every 5-10 days while establishing | 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 |
| Lonicera sempervirens | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries, about every 5-10 days while establishing | Mildly toxic to pets |
| Lonicera x heckrottii | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries, about every 5-10 days while establishing | Mildly toxic to pets |
| Loose Puya | Direct sun (at least 4-6 hours) | When the soil is dry to at least 4 cm depth, roughly every 14-21 days in summer; almost nothing 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 |
| Loulu Palm | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| 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 |
| Low's Pitcher Plant | Bright indirect light (just back from a sunny window) | Regularly — keep medium evenly moist at all times | Mildly toxic to pets |
| Lowii Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep mix moist, watering every few days; never let it dry out or stand flooded | Pet-safe |
| Lowland Brittle Fern | Medium indirect light (a couple of metres from a window) | Moderate — keep evenly moist, allowing the surface to just dry between waterings | Mildly toxic to pets |
| lucent scindapsus | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; every 14 days 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 |
| Lupine | Direct sun (at least 4-6 hours) | Weekly watering | 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 |
| 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 |
| Lyme Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Lythrum salicaria | Direct sun (at least 4-6 hours) | Keep wet; thrives in saturated soil and shallow water | 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 |
| MacGillivray's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer, very sparingly in winter | Pet-safe |
| 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 |
| Macho Fern | 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 |
| 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 Jasmine | Bright indirect light (just back from a sunny window) | When the top 2-3cm of soil starts to dry (spring-summer); sparingly in winter | Pet-safe |
| Madagascar Palm | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; once or twice monthly in winter | Toxic to pets |
| 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 |
| 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 Galen Trumpet Vine | Direct sun (at least 4-6 hours) | Weekly when young; drought-tolerant once established | Mildly toxic to pets |
| Madame Lemoine Lilac | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days; established plants are drought-tolerant | Pet-safe |
| Madonna Lily | Direct sun (at least 4-6 hours) | Moderate; water during active growth, reduce as dormancy approaches | Toxic to pets |
| 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 Inula | Bright indirect light (just back from a sunny window) | 2-3 times per week; tolerates moist to wet conditions | Pet-safe |
| 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 |
| 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 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 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 |
| Maingay Torch Ginger | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 5-7 days in warm months; every 12-14 days in cooler periods | Mildly toxic to pets |
| Maingay's Ginger | Medium indirect light (a couple of metres from a window) | 2–3 times per week | Mildly toxic to pets |
| Majesty palm | Bright indirect light (just back from a sunny window) | Keep soil consistently moist, every 4-7 days | Pet-safe |
| 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 |
| Malaysian Orchid | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; every 14–21 days in winter | 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 |
| 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 |
| Mamey Sapote | 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 |
| 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 |
| Mandevilla 'Sun Parasol Crimson' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 3-5 days in summer 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 |
| Mangrove Date Palm | Bright indirect light (just back from a sunny window) | Keep consistently moist to wet; tolerates periodic flooding | 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 |
| Manica Cycad | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; every 3–4 weeks in winter | Toxic to pets |
| Manjula Pothos | Bright indirect light (just back from a sunny window) | When the top 25-50% of the mix is dry, roughly weekly | Toxic to pets |
| Mann's Culcasia | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of soil feels dry, roughly every 7-10 days | Toxic to pets |
| Manna Ash | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Many-Flowered Cornflag | Direct sun (at least 4-6 hours) | Weekly during autumn-to-spring growing season; dry in summer dormancy | Mildly toxic to pets |
| 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-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-spiked Sage | Direct sun (at least 4-6 hours) | Moderate; water when the top 5 cm of soil is dry | Mildly toxic to pets |
| 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 queen pothos | 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 |
| Marcgravia rectiflora | Bright indirect light (just back from a sunny window) | Keep the root zone and mount consistently moist, watering or misting every 1-3 days | Mildly toxic to pets |
| Marcgravia sintenisii | Bright indirect light (just back from a sunny window) | Keep the mount and roots evenly moist, watering or misting every 1-3 days | Mildly toxic to pets |
| Marie Simon Ceanothus | Direct sun (at least 4-6 hours) | Every 7-10 days in the growing season, allowing the top few centimetres of soil to dry between waterings; less in winter | Mildly toxic to pets |
| Maries Doublefile Viburnum | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 7–10 days; more frequently during establishment and dry spells | 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 |
| Martius Fan Palm | Direct sun (at least 4-6 hours) | Weekly during establishment; once established, every 2–3 weeks depending on rainfall | 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 |
| 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 |
| Mauritius Lychee | Direct sun (at least 4-6 hours) | 2–3 times per week in summer; withhold supplemental water in winter dry period | Mildly toxic to pets |
| Maxima Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep mix moist, watering every few days; not standing in deep water | Pet-safe |
| Maximilian Sunflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal supplemental irrigation needed | Pet-safe |
| Meadow Blazing Star | Direct sun (at least 4-6 hours) | Keep evenly moist to medium; water during dry spells | Pet-safe |
| meadow fountain grass | Direct sun (at least 4-6 hours) | Weekly when new; every 2–3 weeks once established | Pet-safe |
| Mediterranean Fan Palm | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Megaskepasma erythrochlamys | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil dries, roughly every 3-5 days in heat | Mildly toxic to pets |
| Merola's Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; monthly or less in winter | Toxic to pets |
| Merrill's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| 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 |
| Metallic 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 |
| Metallica Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer, every 14 days in winter | 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 Blue Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; reduce to every 3-4 weeks in winter | Pet-safe |
| 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 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 Fence Post Cactus | Direct sun (at least 4-6 hours) | When the top half of soil is dry, roughly every 10-14 days in summer; every 4-6 weeks in winter | 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 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 |
| Mexican Sage | Direct sun (at least 4-6 hours) | Weekly during active growth | 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 Tree Fern | Bright indirect light (just back from a sunny window) | 2-3 times per week; keep trunk moist | 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 |
| Middendorf Weigela | Bright indirect light (just back from a sunny window) | Every 7 days during dry periods; keep evenly moist but not waterlogged | Pet-safe |
| 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 Bellflower 'Prichard's Variety' | Bright indirect light (just back from a sunny window) | Once or twice a week in dry spells; regular moisture during flowering improves performance | Mildly toxic to pets |
| Milky Way Kousa Dogwood | Bright indirect light (just back from a sunny window) | Weekly while establishing; deep watering in summer drought | Pet-safe |
| Min Fir | Direct sun (at least 4-6 hours) | Regularly during establishment; moderate thereafter | Pet-safe |
| Ming aralia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Mildly toxic to pets |
| Miniature Chusan Palm | Bright indirect light (just back from a sunny window) | Weekly in the growing season, reduced in winter | Pet-safe |
| Miniature Sugar 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 in summer; every 14 days in winter | Pet-safe |
| Miquel's Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks | Toxic to pets |
| 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 Kim Lilac | Direct sun (at least 4-6 hours) | Weekly to establish, then occasional deep watering in drought | Mildly toxic to pets |
| Missouri Ironweed | Direct sun (at least 4-6 hours) | Moderate to high — prefers moist soil | 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 |
| Mistletoe Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry | Toxic to pets |
| Mistletoe cactus | 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 | 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 |
| Modoc Cypress | Direct sun (at least 4-6 hours) | Minimal once established; drought-tolerant | Pet-safe |
| Moluccan Fishtail Palm | Direct sun (at least 4-6 hours) | Regularly; maintain consistent soil moisture | Mildly toxic to pets |
| Mombasa Cycad | Direct sun (at least 4-6 hours) | Every 1–3 weeks in the growing season; every 4–6 weeks in winter | Toxic to pets |
| Momi Fir | Direct sun (at least 4-6 hours) | Moderate; water regularly during establishment | Pet-safe |
| Monarch Birch | Direct sun (at least 4-6 hours) | Regular watering for first 2–3 years; moderate once established | Pet-safe |
| 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 |
| Money tree | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, every 7-14 days | Pet-safe |
| Mongolian Linden | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks in dry summers | 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 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 acacoyaguensis | 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 Acuminata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera adansonii (Swiss cheese vine) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 7-10 days in growth | Toxic to pets |
| Monstera Adansonii Archipelago | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Monstera Adansonii Mint | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Monstera Adansonii Wide Form | 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 Aurea | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Costaricensis | 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 |
| Monstera Deliciosa Borsigiana | 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 |
| Monstera Deliciosa Mint Variegata | 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 |
| Monstera Deliciosa Ronronensis | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Deliciosa Sport | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Monstera Esqueleto | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Esqueleto Variegata | 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 |
| Monstera Gracilis | 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 |
| Monstera Karstenianum Peru Variegata | 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 |
| Monstera Laniata | 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 |
| Monstera Lechleriana | 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 |
| Monstera Nigrescens | 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 |
| Monstera obliqua | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of mix is dry | Toxic to pets |
| Monstera Obliqua Peru | Medium indirect light (a couple of metres from a window) | Keep evenly, lightly moist; check every 4-7 days | Toxic to pets |
| Monstera Peru | Bright indirect light (just back from a sunny window) | Every 7-12 days in spring/summer; every 14-21 days in winter | Toxic to pets |
| Monstera pinnatipartita | Bright indirect light (just back from a sunny window) | When the top 25-50% (roughly 2-3 inches) of the mix is dry | Toxic to pets |
| Monstera Pinnatipartita Variegata | 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 |
| Monstera Punctulata | 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 |
| Monstera Siltepecana | Bright indirect light (just back from a sunny window) | Roughly every 5-7 days in summer; less in winter | Toxic to pets |
| Monstera Spruceana | 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 |
| 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 Standleyana Albo | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Monstera Standleyana Cobra | 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 |
| 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 |
| Monstera Tenuis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-9 days | Toxic to pets |
| Monstera Thai Constellation | 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 |
| Monstera Tuberculata | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Xanthospatha | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-8 days | Toxic to pets |
| Monstera-Like Rhaphidophora | Bright indirect light (just back from a sunny window) | When the top 3–4 cm of soil feels dry, roughly every 7–14 days depending on season | 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 |
| Monterey Cypress | Direct sun (at least 4-6 hours) | Weekly during establishment; infrequent once mature | Mildly toxic to pets |
| Montezuma Cypress | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water deeply every 7-14 days, more frequently in heat | Pet-safe |
| Montpellier Rock Rose | Direct sun (at least 4-6 hours) | Low — establishment watering only | Mildly toxic to pets |
| Moonflower | Direct sun (at least 4-6 hours) | Weekly, more often in hot or dry spells | Toxic to pets |
| Moonglow Juniper | Direct sun (at least 4-6 hours) | Every 7-10 days when establishing, then deep occasional soaks | Mildly toxic to pets |
| Moonlight Cactus | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, roughly weekly in summer and around monthly 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 |
| 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 |
| Moso Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in the growing season; weekly 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 |
| Mount Etna Broom | Direct sun (at least 4-6 hours) | Low — very drought-tolerant once established | Toxic to pets |
| Mount Lewis King Palm | 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 |
| 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 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 Fire pieris | Bright indirect light (just back from a sunny window) | Weekly to bi-weekly depending on conditions | 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 Laurel 'Olympic Fire' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry; keep evenly moist, especially in the first years | Toxic to pets |
| 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 Rimu | Bright indirect light (just back from a sunny window) | Every 7-14 days; keep soil consistently moist, especially in summer | Mildly toxic to pets |
| Mountain Soursop | Direct sun (at least 4-6 hours) | Twice weekly when establishing; weekly once mature | Mildly toxic to pets |
| Mountain Strelitzia | Direct sun (at least 4-6 hours) | When the top 4-6 cm of soil is dry, roughly every 7-14 days in summer | 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 |
| Mpumalanga Cycad | Direct sun (at least 4-6 hours) | Every 3–5 weeks | Toxic to pets |
| 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 |
| Mulanje Cycad | Direct sun (at least 4-6 hours) | Weekly to fortnightly in summer; every 3–4 weeks in winter | Toxic to pets |
| Mundu | Bright indirect light (just back from a sunny window) | Water regularly to maintain consistent moisture; avoid prolonged dry spells. | Mildly toxic to pets |
| 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 |
| Myriophyllum spicatum | Direct sun (at least 4-6 hours) | Continuously submerged; maintain pond level so plants sit in 0.5-3 m of water | Mildly toxic to pets |
| Myrtillocactus geometrizans | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 1-2 weeks in summer; sparingly in winter | Mildly toxic to pets |
| Mysore trumpetvine | Bright indirect light (just back from a sunny window) | Regularly during growth; reduced in winter | Pet-safe |
| Mystery Gardenia | Bright indirect light (just back from a sunny window) | Every 5–7 days; adjust by season and pot size | Mildly toxic to pets |
| Nageia nagi | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | 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 |
| Nam Doc Mai Mango | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, roughly every 5-10 days in growth | Pet-safe |
| Nana Lutea Hinoki 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 |
| Nance | Direct sun (at least 4-6 hours) | Every 14–21 days; highly drought-tolerant when established | Pet-safe |
| 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 |
| Naranjilla | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 3-5 days in active growth | Mildly toxic to pets |
| Nardoo | Direct sun (at least 4-6 hours) | Aquatic — grow permanently in shallow water 5–15 cm deep, or in waterlogged pond margin soil | 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-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 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-Leafed Arrowhead Vine | 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 in summer and every 10-14 days in winter | Toxic to pets |
| Narrow-Leaved Ash | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Narrow-Leaved Bird of Paradise | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is completely dry, roughly every 10-14 days in summer | Mildly toxic to pets |
| 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 Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep substrate evenly moist year-round | 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 |
| 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 |
| Naumann's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in growing season; less in winter | 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 |
| Nedda's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in growing season; reduce to every 3–4 weeks in winter | Pet-safe |
| 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 |
| Neglected Ginger | Bright indirect light (just back from a sunny window) | Regular watering to keep soil evenly moist during the growing season. | Mildly toxic to pets |
| Nelumbo 'Mrs. Perry D. Slocum' | Direct sun (at least 4-6 hours) | Always submerged; keep 15-45 cm of water over the crown | Mildly toxic to pets |
| Nelumbo lutea | Direct sun (at least 4-6 hours) | Always submerged; keep 15-60 cm of standing water over the crown | Mildly toxic to pets |
| Nelumbo nucifera | Direct sun (at least 4-6 hours) | Permanently submerged rhizome in still water with warm emergent growth | Mildly toxic to pets |
| Neon pothos | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| 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 × hookeriana | Bright indirect light (just back from a sunny window) | Keep media evenly moist, watering about every 1-2 days in warmth | Mildly toxic to pets |
| 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 edwardsiana | Bright indirect light (just back from a sunny window) | Keep media constantly moist, watering roughly every 1-2 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 macrophylla | Bright indirect light (just back from a sunny window) | Keep the mix evenly moist, watering about every 1-3 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 nebularum | Bright indirect light (just back from a sunny window) | Keep media constantly moist, watering roughly every 1-2 days | Mildly toxic to pets |
| Nepenthes northiana | Bright indirect light (just back from a sunny window) | Keep media evenly moist, watering about every 1-3 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 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 veitchii | Bright indirect light (just back from a sunny window) | Keep media moist; water every 2-3 days | Mildly toxic to pets |
| net-vein camellia | Bright indirect light (just back from a sunny window) | Regularly; consistent moisture throughout the year | Mildly toxic to pets |
| 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 | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water weekly, more in heat | Pet-safe |
| New Guinea Creeper | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce slightly in cooler or drier months | Mildly toxic to pets |
| 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 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 Fern | Bright indirect light (just back from a sunny window) | Consistently moist — water 2-3 times per week during dry spells in the growing season | Pet-safe |
| New Zealand Tree Fuchsia | Bright indirect light (just back from a sunny window) | Regular — consistent moisture | Pet-safe |
| Nicotiana sylvestris | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days | Toxic to pets |
| 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 |
| Nihoa Palm | Direct sun (at least 4-6 hours) | When the top 5-7 cm of soil is dry, roughly every 10-21 days | Pet-safe |
| Nikko Blue Bigleaf Hydrangea | Bright indirect light (just back from a sunny window) | When the top 3–5 cm of soil is dry, roughly every 3–5 days in summer; reduce in winter | Toxic to pets |
| Nikko Fir | Direct sun (at least 4-6 hours) | Weekly when establishing; reduced once established | Pet-safe |
| Ninebark 'Diabolo' | Direct sun (at least 4-6 hours) | Weekly while establishing; established plants only in prolonged drought | Mildly toxic to pets |
| Nipa Palm | Direct sun (at least 4-6 hours) | Keep constantly moist to wet; does not tolerate drying out | Pet-safe |
| 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 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 Heliconia | Bright indirect light (just back from a sunny window) | 2–3 times per week during active growth; reduce in winter | 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 |
| Norfolk Island pine | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Pet-safe |
| Norfolk Island Pine | 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 spring and summer | Mildly toxic to pets |
| Norfolk Tree Fern | Bright indirect light (just back from a sunny window) | 2-3 times per week; increase in summer and wind | Pet-safe |
| Normanbya Cycad | Bright indirect light (just back from a sunny window) | Every 7–14 days in growing season; every 14–21 days in winter | 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 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 |
| 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 |
| Norway Maple | Direct sun (at least 4-6 hours) | Deeply every 7-14 days during the first three growing seasons; established mature trees are largely self-sufficient but benefit from watering during severe drought | Mildly toxic to pets |
| Norway Spruce | Direct sun (at least 4-6 hours) | When the top centimetre of soil begins to dry, often daily in summer | Mildly toxic to pets |
| Nuccio's Gems camellia | Bright indirect light (just back from a sunny window) | Regular; consistent moisture essential from summer through bud set | Mildly toxic to pets |
| 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 |
| Nuphar lutea | Direct sun (at least 4-6 hours) | Permanently submerged roots; keep crown in 0.3-2.5 m of water | Mildly toxic to pets |
| Nuphar polysepala | Direct sun (at least 4-6 hours) | Permanently submerged roots; keep crown in 0.3-2 m of water | Mildly toxic to pets |
| Nuttall's Waterweed | Medium indirect light (a couple of metres from a window) | Permanently submerged | Pet-safe |
| Nymphaea 'Albert Greenberg' | Direct sun (at least 4-6 hours) | Permanently submerged in warm still water | Mildly toxic to pets |
| Nymphaea 'Attraction' | Direct sun (at least 4-6 hours) | Permanently submerged; maintain pond level, top up in summer heat | Mildly toxic to pets |
| Nymphaea 'Director George T. Moore' | Direct sun (at least 4-6 hours) | Permanently submerged in warm still water | Mildly toxic to pets |
| Nymphaea 'Escarboucle' | Direct sun (at least 4-6 hours) | Permanently submerged; keep pond level constant | Mildly toxic to pets |
| Nymphaea 'Firecrest' | Direct sun (at least 4-6 hours) | Permanently submerged in still water | Mildly toxic to pets |
| Nymphaea 'Marliacea Albida' | Direct sun (at least 4-6 hours) | Permanently submerged; keep pond level steady | Mildly toxic to pets |
| Nymphaea 'Marliacea Carnea' | Direct sun (at least 4-6 hours) | Permanently submerged; keep pond level steady | Mildly toxic to pets |
| Nymphaea 'Perry's Fire Opal' | Direct sun (at least 4-6 hours) | Permanently submerged; keep pond level steady | Mildly toxic to pets |
| Nymphaea capensis | Direct sun (at least 4-6 hours) | Permanently submerged in warm still water | 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 |
| Oakleaf 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 |
| 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 |
| 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 |
| Odontonema tubaeforme | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 4-6 days in growth | Mildly 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 Man Palm | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Old Man's Beard | Direct sun (at least 4-6 hours) | During establishment water deeply every 5-7 days; once established, water only during prolonged dry spells | Toxic to pets |
| Old World Climbing 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 |
| 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 |
| 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 |
| Oncidium sphacelatum | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth, when the mix approaches dryness | Pet-safe |
| Only the Lonely Tobacco Plant | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| 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 Clock Vine | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 6-8 days in summer | Pet-safe |
| Orange Glow Firethorn | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days | 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 Tulip Ginger | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly every 7 days in the growing season | Mildly toxic to pets |
| Orange Woolly Sage | Bright indirect light (just back from a sunny window) | Weekly in the growing season; reduce to monthly in winter | Pet-safe |
| Orchid Cactus | 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 |
| 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 Bittersweet | Direct sun (at least 4-6 hours) | Extremely drought-tolerant once established; supplemental watering is rarely needed except in the first season | Toxic to pets |
| Oriental Chain Fern | Medium indirect light (a couple of metres from a window) | Regularly — keep soil consistently moist | 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 |
| 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 |
| Ossorio Gold Umbrella Pine | Bright indirect light (just back from a sunny window) | Once every 7-10 days, keeping soil consistently moist throughout the growing season | Mildly toxic to pets |
| Ostbo Red Mountain Laurel | Medium indirect light (a couple of metres from a window) | Regular; maintain even moisture | 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 |
| 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 |
| Pachystachys coccinea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days in active growth | Mildly toxic to pets |
| 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 Fan Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | 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 |
| 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 Dumbcane | Medium indirect light (a couple of metres from a window) | When the top 3–4 cm of soil is dry, roughly every 7–14 days | Toxic to pets |
| Painted Flowering Maple | Bright indirect light (just back from a sunny window) | Water when top 1–2 cm of compost dries; less in winter | Mildly toxic to pets |
| Painted Lady | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Painted Lady sweet pea | Direct sun (at least 4-6 hours) | Every 3–5 days; daily in hot weather | Toxic to pets |
| Painted Spiral Ginger | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 6-8 days in the growing season; every 14 days in winter | Mildly toxic to pets |
| 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 |
| Palibin Dwarf Korean Lilac | Direct sun (at least 4-6 hours) | Every 7-10 days during dry spells; drought-tolerant once established | Mildly toxic to pets |
| Palinha's Rock Rose | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Palm Leaf Begonia | Bright indirect light (just back from a sunny window) | Roughly weekly in growing season; let the top 2-3 cm dry first | 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 Queen | Bright indirect light (just back from a sunny window) | Every 5–7 days during the growing season; reduce in winter | 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 |
| Pandacaqui | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow soil to partially dry between waterings | Toxic to pets |
| Panicle Fuchsia | Bright indirect light (just back from a sunny window) | Regular — keep just moist | Pet-safe |
| 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 |
| Papaya | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil is dry; consistent moisture without saturation, often every 3-5 days in warmth | 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 |
| Parlor palm | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, every 7-10 days | Pet-safe |
| Parlour Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring and summer; every 14–21 days in winter | Pet-safe |
| Parrot Gladiolus | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce once foliage yellows; cease during summer dormancy | Toxic to pets |
| Parrot's Beak Heliconia | Bright indirect light (just back from a sunny window) | Every 5–8 days; keep soil consistently moist | Mildly toxic to pets |
| 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 |
| Passiflora 'Incense' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 3-5 days in summer heat | Mildly toxic to pets |
| 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 caerulea | 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 |
| Passiflora coccinea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly every 4-7 days in 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 |
| Passiflora racemosa | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 4-7 days during growth | 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 |
| Paz's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days in active growth; every 14-21 days in winter | Pet-safe |
| Peace Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | 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 |
| Pelotazo Mallow | Direct sun (at least 4-6 hours) | Every 10–21 days in summer; monthly or less 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 |
| Penelope Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | 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 |
| Persicaria orientalis | Direct sun (at least 4-6 hours) | About twice a week in summer, keeping soil evenly moist | 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 Canna | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 4-6 days in summer | Pet-safe |
| Peruvian Old Man Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | 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 |
| Peve Minaret Bald Cypress | Direct sun (at least 4-6 hours) | Keep soil consistently moist to wet; water every 5-7 days in dry periods | Mildly toxic to pets |
| 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 |
| Philippine Wax Flower | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil begins to dry, roughly every 5-7 days | Mildly toxic to pets |
| Philodendron | Medium indirect light (a couple of metres from a window) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Philodendron 'Florida Beauty' | Bright indirect light (just back from a sunny window) | Every 5-10 days; when the top 1-2 inches of mix dries out | Toxic to pets |
| Philodendron 'Florida Ghost' | Bright indirect light (just back from a sunny window) | Roughly every 5-7 days in the growing season; less in winter | 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 'Ring of Fire' | Bright indirect light (just back from a sunny window) | Roughly every 7-9 days in spring and summer; less 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 Bipennifolium (Horsehead) | Bright indirect light (just back from a sunny window) | When the top 2-5 cm (1-2 in) of mix is dry, roughly weekly in growth | Toxic to pets |
| Philodendron Brandtianum (Silver Leaf) | Bright indirect light (just back from a sunny window) | Roughly weekly in growing season; less in winter | Toxic to pets |
| Philodendron Brasil | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Philodendron Cobra | 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 |
| Philodendron Corcovadense | Bright indirect light (just back from a sunny window) | When the top half of the substrate is dry, about weekly | Toxic to pets |
| Philodendron Cream Splash | 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 Dark Lord | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil is dry, roughly every 7-10 days | 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 El Choco Red | Bright indirect light (just back from a sunny window) | Roughly weekly; when the top 2-3 in (5-7 cm) of mix is dry | Toxic to pets |
| Philodendron Elegans | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Philodendron erubescens | 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 Erubescens Green | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Fuzzy Petiole | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Philodendron Gabby | 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 Gigas | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of mix are dry, roughly weekly in summer and less in winter | Toxic to pets |
| Philodendron Goeldii | 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 |
| Philodendron Golden Goddess | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Hastatum | 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 |
| Philodendron hederaceum 'Micans' | 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 hederaceum 'Rio' | 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 hederaceum 'Silver Stripe' | 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 Hederaceum Heartleaf Variegata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Insigne | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Philodendron Jose Buono | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Lemon Lime | Bright indirect light (just back from a sunny window) | Every 7-10 days in growing season; less in winter | Toxic to pets |
| Philodendron Longilobatum | 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 |
| Philodendron Lynamii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Philodendron Majestic | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, about every 7-10 days | Toxic to pets |
| Philodendron Maximum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Melanochrysum | Bright indirect light (just back from a sunny window) | Roughly weekly; when the top 2-3 in (5-7 cm) of soil is nearly dry | Toxic to pets |
| Philodendron Melinonii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Mexicanum | 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 micans | 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 |
| Philodendron Nangaritense | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 5-8 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 Panduriforme | 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 |
| 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 Patriciae | 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 Pedatum (Oak Leaf) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7 days in summer | Toxic to pets |
| Philodendron Pink Princess | Bright indirect light (just back from a sunny window) | When the top 2.5cm of compost is dry, roughly weekly in summer | Toxic to pets |
| Philodendron Pseudoverrucosum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Philodendron Pteromischum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 7-10 days | Toxic to pets |
| Philodendron Radiatum | 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 Rugosum (Pigskin) | Bright indirect light (just back from a sunny window) | Roughly weekly; when the top 2-3 cm (1 inch) of soil is dry | Toxic to pets |
| Philodendron Sagittifolium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) 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 Serpens (Fuzzy Petiole) | Bright indirect light (just back from a sunny window) | When the top 2-5 cm (1-2 in) of mix dries | Toxic to pets |
| Philodendron Sharoniae | 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 Silver Sword | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; less in autumn and winter | Toxic to pets |
| Philodendron Sodiroi | Bright indirect light (just back from a sunny window) | Roughly once a week; allow the top 2-5 cm (1-2 in) of mix to dry between waterings | Toxic to pets |
| Philodendron Spiritus Sancti Silver | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Philodendron splendid | 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 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 subhastatum | 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 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 |
| Philodendron Tripartitum | 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 Warscewiczii | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron White Knight | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring-summer; every 14-21 days in winter | Toxic to pets |
| Philodendron White Wizard | 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 Xanadu | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly weekly in summer | Toxic to pets |
| Phoenicean Juniper | Direct sun (at least 4-6 hours) | Water weekly when young; essentially rainfall-dependent once established | Mildly toxic to pets |
| 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 'Diabolo' | 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 |
| 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 |
| Pilalo Fuchsia | Bright indirect light (just back from a sunny window) | Freely in growth; reduce in winter | 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 |
| Pindo Palm | Direct sun (at least 4-6 hours) | Weekly while establishing; deeply but infrequently once mature | Mildly 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 |
| Pinemat manzanita | Direct sun (at least 4-6 hours) | Low to moderate; allow soil to dry between waterings once established | 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 Cascade Tamarisk | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Pink Deutzia | Direct sun (at least 4-6 hours) | Every 7-10 days during dry periods; drought-tolerant once established | 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 Flowering Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering; increase in summer heat | 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 Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; afterwards only in prolonged drought | Pet-safe |
| Pink Pampas Grass | Direct sun (at least 4-6 hours) | Weekly during the establishment year; established plants are largely self-sufficient on rainfall in temperate climates | Mildly toxic to pets |
| 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 Princess Philodendron | 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 |
| 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 Torch Ginger | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 5-7 days in the growing season; every 12-14 days when cooler | 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 Velvet Banana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| 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 |
| 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 |
| Pitomba | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil dries, roughly weekly; keep young plants more consistently moist | Mildly toxic to pets |
| 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 |
| 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 |
| 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 |
| Pochutla Chamaedorea | Medium indirect light (a couple of metres from a window) | Every 7–14 days (allow top 2 in to dry between waterings) | Pet-safe |
| Podocarpus 'Maki' | 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 |
| 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 |
| Poinsettia | Bright indirect light (just back from a sunny window) | When the top of the soil feels dry | Toxic to pets |
| Point Reyes bearberry | Direct sun (at least 4-6 hours) | Low once established; water weekly for the first 1–2 seasons | Pet-safe |
| Pointed-Cap Ginger | Medium indirect light (a couple of metres from a window) | Regularly; maintain consistently moist soil year-round | Mildly toxic to pets |
| 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 |
| 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 |
| 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 |
| Pompona Vanilla | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of the growing medium feels dry, roughly every 7-10 days in summer | Pet-safe |
| Pond Apple | Direct sun (at least 4-6 hours) | Keep soil consistently moist to wet; tolerates periodic flooding | Mildly toxic to pets |
| Pond Cypress | Direct sun (at least 4-6 hours) | Keep consistently moist; tolerates standing water and periodic flooding | 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 |
| Portea petropolitana | Bright indirect light (just back from a sunny window) | Keep a little water in the central cup; flush and refill every 1-2 weeks | Pet-safe |
| 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 |
| Pothos | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 7-10 days | Toxic to pets |
| Pothos 'Shangri La' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Pothos Happy Leaf | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, about every 7-14 days | 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 Pearls and Jade | 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 |
| Potts Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-10 days in summer; every 14-21 days in winter | Pet-safe |
| Powdery Spiral Ginger | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during active growth | Mildly toxic to pets |
| Powdery Thalia | Direct sun (at least 4-6 hours) | Permanent standing water or saturated soil; 15–45 cm over crown | Mildly toxic to pets |
| Prairie Azure Sage | Direct sun (at least 4-6 hours) | Fortnightly once established | Pet-safe |
| Prairie Blazing Star | Direct sun (at least 4-6 hours) | Moderate; weekly during establishment; drought-tolerant once established | Pet-safe |
| Prairie Dock | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | 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 |
| Preston Palm | Bright indirect light (just back from a sunny window) | Every 4–7 days; containers may need more frequent checking in summer heat | Pet-safe |
| Preston's Palm | Bright indirect light (just back from a sunny window) | Every 4–7 days; containers may need checking more frequently in summer heat | 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 |
| Pride of Rochester Deutzia | Direct sun (at least 4-6 hours) | Every 7-10 days during dry spells; drought-tolerant once established | Pet-safe |
| 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 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 |
| Princess Flower | Direct sun (at least 4-6 hours) | Roughly weekly; keep the soil evenly moist | Mildly toxic to pets |
| 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 |
| 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 |
| Przewalski's Leopard Plant | Medium indirect light (a couple of metres from a window) | Every 3-5 days in the growing season; soil should remain evenly moist to slightly wet | Mildly toxic to pets |
| Przewalskii Ligularia | Medium indirect light (a couple of metres from a window) | Keep constantly moist; water deeply 2-3 times weekly, more in heat | Mildly toxic to pets |
| Pseuderanthemum atropurpureum | 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 summer | Mildly toxic to pets |
| Pseuderanthemum carruthersii | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm of soil is dry, about every 7-10 days | Mildly toxic to pets |
| Pseuderanthemum carruthersii var. carruthersii | 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 summer | Mildly 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 |
| Ptychosperma Elegans | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Mildly toxic to pets |
| 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 |
| Pumila Pampas Grass | Direct sun (at least 4-6 hours) | Deeply once per week during the first growing season; established plants can survive on rainfall in most temperate climates | Mildly toxic to pets |
| Punting-Pole Bamboo | Direct sun (at least 4-6 hours) | Once or twice per week during growing season; less frequent in winter | Pet-safe |
| Purple Allamanda | Direct sun (at least 4-6 hours) | Every 3–5 days during active growth; reduce to weekly or less in cooler months | Toxic to pets |
| Purple Giant Hyssop | Bright indirect light (just back from a sunny window) | Every 5–7 days; tolerates periodic wet spells | 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 Japanese Barberry | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days | Mildly toxic to pets |
| 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 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 Royal Fern | Medium indirect light (a couple of metres from a window) | Freely and consistently — never allow to dry out | Pet-safe |
| Purple Royal Fern | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist to wet; may need watering every 2-3 days in summer heat | Pet-safe |
| 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 Siberian Melic | Bright indirect light (just back from a sunny window) | Every 1–2 weeks during the growing season | 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-Brown Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring and summer; every 14-21 days in winter | Pet-safe |
| Purple-flowered Sage | Bright indirect light (just back from a sunny window) | Moderate; water when the top 3–5 cm of soil is dry | 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 |
| Pygmy Date Palm | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth; reduce in winter | Pet-safe |
| Pygmy Date Palm 'Trifurcata' | 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 growth | 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 |
| Pyramidalis Arborvitae | Direct sun (at least 4-6 hours) | Two to three times weekly when establishing; weekly once rooted in | 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 Mix Spider Flower | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Queen of the Andes | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is completely dry, roughly every 10-14 days in summer and less in winter | Mildly toxic to pets |
| Queen of the Night | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Queen of the Night Cereus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer and every 4-6 weeks in winter | 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 Sago | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, roughly every 7-12 days in growth | Toxic to pets |
| Queensland Kauri | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days | Mildly toxic to pets |
| 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 |
| Quila Bamboo | Medium indirect light (a couple of metres from a window) | Weekly to twice weekly during growing season; reduce in winter | 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 |
| 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 |
| Rambai | Direct sun (at least 4-6 hours) | 2–3 times per week; more frequent in dry season | 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 |
| Rat Tail Cactus | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in spring and summer; every 3–4 weeks in winter | Pet-safe |
| Rat Tail Cactus | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; sparingly in winter | Mildly toxic to pets |
| Rat Tail Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in spring and summer; reduce to every 3-4 weeks in winter | Pet-safe |
| Rattlesnake Master | Direct sun (at least 4-6 hours) | Water to establish, then rarely; highly drought-tolerant once rooted | Mildly 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 |
| Recurved Leucothoe | Medium indirect light (a couple of metres from a window) | Regularly; maintain consistently moist soil throughout the growing season | Toxic to pets |
| 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 Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 3–5 days (keep evenly moist; allow top 2 cm to dry) | 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 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 Fir | Direct sun (at least 4-6 hours) | Regular moisture; does not tolerate summer drought well | Pet-safe |
| Red Frangipani | Direct sun (at least 4-6 hours) | Water deeply when the soil is dry to touch (roughly every 7–10 days in summer); withhold almost completely in winter dormancy | Mildly toxic to pets |
| 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 Inca Passionflower | Direct sun (at least 4-6 hours) | Every 3–5 days; keep consistently moist but not waterlogged | Pet-safe |
| Red Indian Water Lily | Direct sun (at least 4-6 hours) | Permanently submerged — maintain 25–50 cm of water over the crown | Mildly toxic to pets |
| Red Indian Water Lily | Direct sun (at least 4-6 hours) | Fully aquatic; roots and rhizome submerged, leaves and flowers floating or emergent | Mildly toxic to pets |
| 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 Lady Papaya | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil is dry; steady moisture without saturation, often every 3-5 days in warmth | Mildly 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 Latan Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | 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 Osier Dogwood | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | Pet-safe |
| Red Passion Flower | Direct sun (at least 4-6 hours) | Water thoroughly when the top 3-4 cm of soil dries out, roughly every 5-8 days; reduce in winter | Toxic to pets |
| Red Pine | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry; allow slight drying between waterings | Mildly toxic to pets |
| Red Prince Weigela | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in the growing season | Mildly toxic to pets |
| 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 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 Spiral Ginger | Medium indirect light (a couple of metres from a window) | Freely in growing season; sparingly 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 Stem Ginger Lily | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly every 5-7 days in summer; every 14 days in winter | Mildly toxic to pets |
| Red Ti Plant | 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 |
| Red Torch Cleistocactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Red Tower Ginger | Bright indirect light (just back from a sunny window) | Regular; keep soil consistently moist in growing season | Mildly toxic to pets |
| Red Tower Ginger | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 5-7 days in the growing season; every 10-14 days in cooler months | Mildly toxic to pets |
| Red Twig Dogwood 'Arctic Fire' | Direct sun (at least 4-6 hours) | Keep consistently moist; tolerates wet soil | Pet-safe |
| Red-Fleshed Dragon Fruit | Bright indirect light (just back from a sunny window) | Water when the top 3-5 cm of soil is dry, roughly every 7-10 days in growth; reduce in winter | 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-Margined Heliconia | Bright indirect light (just back from a sunny window) | 2-3 times per week in active growth; reduce in cool or dormant periods | Mildly toxic to pets |
| red-twig dogwood | Bright indirect light (just back from a sunny window) | Weekly when young; tolerates both wet and dry once established | Mildly toxic to pets |
| Redvein Abutilon | Bright indirect light (just back from a sunny window) | Regularly in growth; reduced in winter | Mildly toxic to pets |
| 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 |
| Reed Avocado | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, about every 5-7 days in warm growth | Toxic to pets |
| Reed Sweet-grass | Direct sun (at least 4-6 hours) | Permanently wet; grows in standing water 15–45 cm deep | Pet-safe |
| Reed Sweetgrass | Direct sun (at least 4-6 hours) | Shallow to moderate aquatic; submerged 0–30 cm; tolerates winter flooding | Mildly toxic to pets |
| Regal Anthurium | Bright indirect light (just back from a sunny window) | Every 5-9 days in growth; water when the top 2-3 cm has dried | Toxic to pets |
| Regal Elkhorn Fern | Bright indirect light (just back from a sunny window) | Soak when the root mass nears dry, roughly every 7-14 days | Pet-safe |
| Regal Staghorn Fern | Bright indirect light (just back from a sunny window) | When the shield fronds feel dry to the touch or the mounted board is very light, soak every 7-14 days | 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 |
| 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 |
| 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 |
| Rhaphidophora Beccarii | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days in growth | Toxic to pets |
| Rhaphidophora Cryptantha | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-8 days | 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 |
| Rhaphidophora Foraminifera | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Rhaphidophora Hongkongensis | 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 |
| Rhaphidophora korthalsii | 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 |
| Rhaphidophora Lobbii | 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 |
| Rhaphidophora Oblongata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7 days | Toxic to pets |
| Rhaphidophora Pachyphylla | 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 |
| Rhaphidophora Pertusa | 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 |
| Rhaphidophora Sylvicola | 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 |
| Rhaphidophora Tetrasperma (Mini Monstera) | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of soil are dry, roughly weekly in summer | Toxic to pets |
| Rhaphidophora Tetrasperma Variegata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, around every 5-7 days in growth | Toxic to pets |
| Rhapis Multifida | 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 |
| Rhapis Subtilis | 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 |
| Rheingold Arborvitae | Direct sun (at least 4-6 hours) | Twice weekly while establishing; weekly thereafter | Mildly toxic to pets |
| Rhododendron 'Blue Peter' | Bright indirect light (just back from a sunny window) | Deeply once or twice a week in dry weather; keep consistently moist | Toxic to pets |
| 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 'English Roseum' | Bright indirect light (just back from a sunny window) | Deeply once a week during the growing season; reduce in winter | Toxic to pets |
| Rhododendron 'Fastuosum Flore Pleno' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil begins to dry, roughly every 7-14 days depending on conditions | Toxic to pets |
| Rhododendron 'Nova Zembla' | Bright indirect light (just back from a sunny window) | Deeply once a week; more frequently during establishment and summer heat | Toxic to pets |
| Rhododendron 'Pink Pearl' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil begins to dry, roughly every 7-10 days during the growing season | 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 |
| Rhododendron 'Roseum Elegans' | Bright indirect light (just back from a sunny window) | Deeply once a week during dry spells; keep consistently moist especially in summer | 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 |
| 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 Goldenrod | Direct sun (at least 4-6 hours) | Low — drought tolerant once established | Pet-safe |
| Rimu | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 10-14 days | Mildly toxic to pets |
| 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 |
| Ringed Sage | Direct sun (at least 4-6 hours) | Low to moderate; allow soil to dry between waterings | Pet-safe |
| 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 |
| River Water Crowfoot | Direct sun (at least 4-6 hours) | Permanently submerged in flowing or moderately moving water 15–60 cm deep | Toxic to pets |
| Rivieri Voodoo Lily | Bright indirect light (just back from a sunny window) | Keep evenly moist during active leaf growth, watering when the top 2-3 cm of soil dries; stop almost entirely once the leaf yellows and dies back. | Toxic to pets |
| Robert Young Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week when establishing; weekly 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 |
| Rock Banana | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-14 days in active growth | Mildly toxic to pets |
| Rock Palm | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 2-3 weeks in winter | 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 Juniper | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days | 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 |
| Rose | Direct sun (at least 4-6 hours) | Deep watering once a week, more in heat | 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 grape | Bright indirect light (just back from a sunny window) | When the top 2-3cm of soil dries in growth; sparingly in winter | Mildly toxic to pets |
| 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 |
| Rosebay Rhododendron | 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 in summer | Toxic to pets |
| Rosebay Willowherb | Direct sun (at least 4-6 hours) | Minimal once established; tolerates both dry and wet soils | Pet-safe |
| Rosemary Barberry | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry; established plants are drought-tolerant and may need watering only in prolonged dry spells | Mildly toxic to pets |
| Rosemary-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Low — water only during establishment | Mildly toxic to pets |
| 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 |
| 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 Bamboo | Direct sun (at least 4-6 hours) | Frequently; keep moist, especially when establishing | Pet-safe |
| Rough Blazing Star | Direct sun (at least 4-6 hours) | Water to establish, then only during extended drought | Pet-safe |
| Rough Coneflower | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Rough Spiral Ginger | Bright indirect light (just back from a sunny window) | Regular; keep evenly moist during growing season | Mildly toxic to pets |
| Rough Tree Fern | Bright indirect light (just back from a sunny window) | Keep consistently moist; water every 3-5 days in the growing season, every 7-10 days in cooler months | Pet-safe |
| 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-leafed Stephania | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; cease in winter | Toxic to pets |
| Round-leaved Sage | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth | Pet-safe |
| Rounded Sweetgum | Direct sun (at least 4-6 hours) | Weekly during establishment; less once mature | Mildly toxic to pets |
| 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 |
| Royal Azalea | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; reduce after leaf drop | Toxic to pets |
| Royal Fern | Medium indirect light (a couple of metres from a window) | Keep soil constantly moist; water whenever the surface starts to dry, often 2-3 times a week in growth | Mildly toxic to pets |
| 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 |
| Rubber plant | 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 |
| Rudbeckia 'Henry Eilers' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-14 days | 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 |
| Rufa Fountain Bamboo | Bright indirect light (just back from a sunny window) | Regularly during the growing season, approximately every 5–7 days; keep soil consistently moist but not waterlogged | Pet-safe |
| Ruffled Fan Palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is just dry, roughly every 4-6 days | Mildly toxic to pets |
| Rugosa Rose | Direct sun (at least 4-6 hours) | weekly when establishing, monthly once established | Pet-safe |
| Rumph's Pothos | 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 |
| 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 |
| 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 |
| 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 |
| Sacahuista | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Sacchariflorus Silver Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; tolerates moist to wet soils thereafter | 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 |
| 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 |
| Sageretia Bonsai | Bright indirect light (just back from a sunny window) | Keep consistently moist; water as the surface starts to dry, often daily | Mildly 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 |
| Sakhalin Fir | Direct sun (at least 4-6 hours) | Moderate; water regularly during establishment | Pet-safe |
| 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 Holmes Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | 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 |
| 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 Jose Hesper Palm | Direct sun (at least 4-6 hours) | Every 2–3 weeks during growth; monthly or less when established | Pet-safe |
| San Jose Hesper Palm | Direct sun (at least 4-6 hours) | When the top 5-7 cm of soil is dry, roughly every 10-14 days in the growing season; every 3-4 weeks in winter | Pet-safe |
| San Pedro Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, every 7-10 days in summer; once every 3-5 weeks in winter | Toxic to pets |
| Sanchezia speciosa | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days in warm growth | Mildly toxic to pets |
| Sand Bluestem | Direct sun (at least 4-6 hours) | Minimal — seasonal rainfall only in most settings | Pet-safe |
| Sand Sedge | Direct sun (at least 4-6 hours) | Very infrequent — drought-adapted | Pet-safe |
| Sanders Blue Spruce | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply weekly while establishing, then during dry periods | 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 |
| Sanguisorba canadensis | Direct sun (at least 4-6 hours) | Keep consistently moist; water 2-3 times weekly in dry spells | Mildly 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 Stuckyi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Santa Barbara Ceanothus | Direct sun (at least 4-6 hours) | Every 7-10 days during the first growing season; established plants are very drought-tolerant and need watering only during prolonged drought | Mildly 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 |
| Saphyr Rouge Firethorn | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days | Mildly toxic to pets |
| 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 Tower | Direct sun (at least 4-6 hours) | every 7–10 days in the growing season, every 21–28 days in winter | Pet-safe |
| Sarapiqui Heliconia | Bright indirect light (just back from a sunny window) | 2–3 times per week in active growth; reduce modestly in cooler periods | Mildly toxic to pets |
| 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 |
| 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 |
| Sasanqua Camellia | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply once or twice weekly in the growing season, more in heat | Pet-safe |
| Sasanqua Camellia 'Yuletide' | Bright indirect light (just back from a sunny window) | About weekly, more in summer heat; water when the top 3-5 cm of soil is dry | Pet-safe |
| Satellit Bosnian Pine | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Satin Pothos | 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 |
| 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 |
| Satsuki Azalea | Bright indirect light (just back from a sunny window) | Keep evenly moist — water when the surface just begins to dry, often daily in heat | 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 |
| 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 |
| Sawara Cypress | Direct sun (at least 4-6 hours) | When the top 2 cm of soil starts to dry, often daily in summer heat | Mildly toxic to pets |
| Sawtooth Sunflower | Direct sun (at least 4-6 hours) | Weekly when young; every 1-2 weeks when established | Pet-safe |
| Scabrosa Rugosa Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant afterwards | Pet-safe |
| Scarlet Banana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Scarlet Begonia | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil feels dry | Toxic to pets |
| Scarlet Ginger Lily | Bright indirect light (just back from a sunny window) | Frequently during the growing season; reduce sharply in winter | Mildly toxic to pets |
| Scarlet Ginger Lily | Bright indirect light (just back from a sunny window) | Keep soil consistently moist during active growth, watering roughly every 4-6 days | Pet-safe |
| Scarlet Leucothoe | Medium indirect light (a couple of metres from a window) | Regular; maintain consistent moisture | Toxic to pets |
| Scarlet Passion Flower | Direct sun (at least 4-6 hours) | When the top 2 cm of soil is dry, roughly every 5-8 days in summer | Mildly toxic to pets |
| Scarlet Torch Ginger | Bright indirect light (just back from a sunny window) | 2–3 times per week | Mildly toxic to pets |
| 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 |
| 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 |
| Schmitz's Cycad | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in growing season; every 3–4 weeks in winter | Toxic to pets |
| Schoenoplectus tabernaemontani 'Albescens' | Direct sun (at least 4-6 hours) | Keep permanently wet; never let the crown dry out | Mildly toxic to pets |
| Schoenoplectus tabernaemontani 'Zebrinus' | Direct sun (at least 4-6 hours) | Constantly wet; shallow margin | Mildly toxic to pets |
| Schomburgk's Dancing Ginger | Medium indirect light (a couple of metres from a window) | Abundantly during active growth (spring to autumn); reduce to once weekly when dormant | Mildly toxic to pets |
| Schott's Syngonium | 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 in warm seasons | 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 |
| Sciadopitys 'Wintergreen' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply weekly in the first 2-3 years, more in heat | 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 |
| Scindapsus Exotica | 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 |
| Scindapsus Officinalis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Scindapsus Pictus Jade Satin | 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 |
| Scindapsus Pictus Silver Hero | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-14 days | Toxic to pets |
| Scindapsus Silvery Ann | 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 |
| Scindapsus Treubii 'Dark Form' | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 2-3 inches of soil dry out first | Toxic to pets |
| Scindapsus Treubii Moonlight | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in growth; less in winter | Toxic to pets |
| Scirpus lacustris | Direct sun (at least 4-6 hours) | Constantly wet; shallow to moderately deep water | Mildly 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 |
| 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 Hibiscus | Direct sun (at least 4-6 hours) | 1–2 times per week in spring and summer; reduce in winter | Mildly 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 |
| Seigen Japanese Maple | Bright indirect light (just back from a sunny window) | Keep evenly moist; often daily through summer | Mildly toxic to pets |
| Selenicereus pteranthus | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days in summer | 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 |
| Senegal Date Palm | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, roughly every 5-10 days | Pet-safe |
| Senegal Date Palm | Direct sun (at least 4-6 hours) | Water deeply every 7-14 days in active growth; more drought-tolerant once established | Pet-safe |
| 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 Peace Lily | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring and summer; every 14 days in autumn and winter | Toxic to pets |
| Sequoia 'Adpressa' | Bright indirect light (just back from a sunny window) | When the top few centimetres of soil dry; keep consistently moist, every 5-10 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 |
| Serrated Enkianthus | Bright indirect light (just back from a sunny window) | Regular — even moisture throughout growing season | Toxic to pets |
| Sesse's Sage | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; monthly in winter | Mildly toxic to pets |
| 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 |
| Sexy Pink Heliconia | Direct sun (at least 4-6 hours) | 2–3 times per week in summer, reducing in winter | Mildly toxic to pets |
| Sexy Pink Heliconia | 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 growing season | 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 |
| Shagbark manzanita | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; more frequent during the first 2 years | Pet-safe |
| Shallon | Medium indirect light (a couple of metres from a window) | Moderate; drought-tolerant once established | Mildly toxic to pets |
| Shampoo Ginger | Bright indirect light (just back from a sunny window) | Every 3–5 days in the growing season; minimal to none during winter dormancy | Pet-safe |
| Sharp-fruited Abutilon | Direct sun (at least 4-6 hours) | Every 7–10 days when young; fortnightly once established | Pet-safe |
| Sharp-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days during active growth; reduce in winter | Pet-safe |
| Sheep Laurel | Bright indirect light (just back from a sunny window) | Regular; keep soil consistently moist | Toxic to pets |
| 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 |
| Sheridan Spire Dawn Redwood | Direct sun (at least 4-6 hours) | Regularly — maintain consistently moist soil | Pet-safe |
| Shingle Monstera | Bright indirect light (just back from a sunny window) | When the top third of the mix dries | 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 | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 inch) of mix dries out | 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 fetterbush | Bright indirect light (just back from a sunny window) | Consistently moist to wet — do not allow prolonged drought | Toxic to pets |
| Shining Fuchsia | Bright indirect light (just back from a sunny window) | Moderate during growth; minimal in winter | Pet-safe |
| 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 Pondweed | Direct sun (at least 4-6 hours) | Fully submerged — permanently aquatic; water is the growing medium, not an irrigation schedule | Pet-safe |
| Shohin Japanese Maple | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; often daily in summer heat | Mildly toxic to pets |
| 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 |
| Shore Pine | Direct sun (at least 4-6 hours) | When the top 2-3 cm of the mix is dry, often daily in summer heat and every 3-5 days in cool weather | Pet-safe |
| Short-winged Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Showy Border Forsythia | Direct sun (at least 4-6 hours) | Every 7-14 days during dry spells; very drought-tolerant once established | Pet-safe |
| Showy Goldenrod | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water in extended dry spells only | Pet-safe |
| Showy Japanese Lily | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil is dry | Toxic to pets |
| 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 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 |
| 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 Nemesia | Direct sun (at least 4-6 hours) | Water when the top 2–3 cm of soil is dry | 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 Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; low once established | Pet-safe |
| Sichuan Arborvitae | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in the growing season | 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 |
| Siebold's Magnolia | Bright indirect light (just back from a sunny window) | Weekly throughout the growing season; reduce in winter | 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 Leucothoe | Medium indirect light (a couple of metres from a window) | Regularly; do not allow to dry out between waterings | Toxic to pets |
| Sikkim Banana | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days during active growth | Pet-safe |
| 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 wisteria | Direct sun (at least 4-6 hours) | Weekly during growing season; reduce in 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 Date Palm | Direct sun (at least 4-6 hours) | Water deeply every 10-14 days in dry periods; largely self-sufficient once established in the ground | 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 European Fan Palm | Direct sun (at least 4-6 hours) | Water every 14-21 days in dry periods; very drought-tolerant once established in the ground | Pet-safe |
| Silver Feather Grass | Direct sun (at least 4-6 hours) | Water every 7-14 days during the first growing season; established clumps require little supplemental watering | Mildly toxic to pets |
| Silver Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once established | 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 Jade Plant | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of soil is dry, roughly every 10-14 days in summer | Toxic to pets |
| Silver Mediterranean Fan Palm | Direct sun (at least 4-6 hours) | Moderate; allow top 3–5 cm to dry between waterings | Pet-safe |
| 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 pothos | 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 |
| Silver Tibouchina | Direct sun (at least 4-6 hours) | Water regularly during the growing season to keep the soil moist but not waterlogged; reduce in winter. | 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 Tree Fern | Bright indirect light (just back from a sunny window) | Keep consistently moist; water every 3-5 days in summer, reducing to every 7-10 days in cooler months | Pet-safe |
| Silverberry | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Simon Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in summer, once per week in winter | Pet-safe |
| Singapore Plumeria | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; very sparingly in winter | 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 |
| 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 |
| Sitka Spruce | Direct sun (at least 4-6 hours) | Regular — keep soil consistently moist; very high natural rainfall in native habitat | Pet-safe |
| Skinner's Zamia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14–21 days in cooler periods | Toxic to pets |
| Sky Flower Vine | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Skyracer Moor Grass | Direct sun (at least 4-6 hours) | Regular; maintain consistent moisture | 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 |
| Slender Ginger Lily | Bright indirect light (just back from a sunny window) | Consistently moist in the growing season; reduce sharply in winter | Pet-safe |
| Slender Lady Palm | 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 |
| 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 |
| Small Teasel | Medium indirect light (a couple of metres from a window) | Regular; keep soil reliably moist | Mildly toxic to pets |
| Small-Fruited Ptychosperma | 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 |
| Small-leaved Fuchsia | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; every 14-21 days 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 Cane Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost feel dry | Toxic to pets |
| Smooth Cayenne Pineapple | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Smooth Coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Smooth Cordgrass | Direct sun (at least 4-6 hours) | Continuous tidal immersion — lower intertidal zone | 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 Spiral Ginger | Bright indirect light (just back from a sunny window) | Regular; evenly moist in growing season | Mildly toxic to pets |
| Snake Cactus | 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; every 3-4 weeks in winter | Pet-safe |
| Snake Vine | Direct sun (at least 4-6 hours) | Low to moderate; highly drought tolerant once established | Mildly toxic to pets |
| Snake-Petal Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in active growth; every 3–4 weeks in winter | Pet-safe |
| Snap Ginger | Medium indirect light (a couple of metres from a window) | Regularly during the growing season; reduce in winter | Mildly toxic to pets |
| Snapdragon vine | Bright indirect light (just back from a sunny window) | Water when the top 2–3 cm of soil dries out, roughly every 5–7 days | Pet-safe |
| Sneezeweed | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 4-7 days, more in heat | Toxic to pets |
| Snow Banana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil begins to dry, roughly every 5-7 days in summer | Pet-safe |
| snowball bush | Bright indirect light (just back from a sunny window) | Weekly when young; every 1–2 weeks once established | Mildly toxic to pets |
| Snowberry | Bright indirect light (just back from a sunny window) | Regular; keep consistently moist | Mildly toxic to pets |
| Snowberry Heath | Medium indirect light (a couple of metres from a window) | Regularly; maintain consistently moist but not waterlogged soil | Pet-safe |
| 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 |
| Sobralia xantholeuca | Bright indirect light (just back from a sunny window) | Water freely in active growth to stay evenly moist; reduce 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 |
| Soft Tree Fern | Medium indirect light (a couple of metres from a window) | Keep the trunk and root zone consistently moist; water into the crown and down the trunk every few days in warm weather | Mildly toxic to pets |
| Soft-stem Bulrush | Direct sun (at least 4-6 hours) | Permanently aquatic or waterlogged; plant at 0–60 cm (0–24 in) water depth | 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 |
| Solitary Fishtail Palm | 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 |
| Somali Desert Rose | Direct sun (at least 4-6 hours) | Weekly in hot active growth (above 30°C/86°F); cease or minimise in winter | Toxic to pets |
| Soncoya | Direct sun (at least 4-6 hours) | Twice weekly when young; weekly once established | 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 |
| Sonoran Palmetto | Direct sun (at least 4-6 hours) | When the top 5-6 cm of soil is dry, roughly every 14-21 days in summer | 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 Canna | Direct sun (at least 4-6 hours) | Keep consistently moist to wet; suitable for bog or marginal planting | Pet-safe |
| Southern Cattail | Direct sun (at least 4-6 hours) | Continuously moist to submerged | Pet-safe |
| Southern Heath | Direct sun (at least 4-6 hours) | Water regularly but allow the soil surface to dry slightly between waterings | Pet-safe |
| Southern Japanese Hemlock | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduced in winter | Pet-safe |
| 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 |
| Souvenir de la Malmaison Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while establishing; mature plants when the top 5 cm of soil is dry | 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 Juniper | Direct sun (at least 4-6 hours) | Water fortnightly when young; essentially self-sufficient once established | Mildly toxic to pets |
| Spanish Moss | Bright indirect light (just back from a sunny window) | Mist 2-4 times a week, or soak 20-30 minutes weekly in dry conditions | Pet-safe |
| Sparganium erectum | Direct sun (at least 4-6 hours) | Constantly wet; shallow water or saturated margin | Mildly toxic to pets |
| Spathiphyllum 'Sensation' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, often every 5-9 days | Toxic to pets |
| Spatterdock | Direct sun (at least 4-6 hours) | Permanently aquatic; plant at 30–120 cm (12–48 in) water depth | Mildly 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 |
| Spiked Ginger Lily | Bright indirect light (just back from a sunny window) | Regularly during active growth; sparingly in winter | Mildly toxic to pets |
| Spiked Ginger Lily | 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 the growing season; reduce to every 2-3 weeks in winter | Mildly toxic to pets |
| Spindle Palm | 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 |
| 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 Palm | Bright indirect light (just back from a sunny window) | Keep the top 2-3 cm consistently moist, roughly every 5-7 days | Pet-safe |
| Spiny Tree Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days | Pet-safe |
| Spiraea 'Grefsheim' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days during the growing season | 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 |
| Spiritus Sancti | 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 |
| Splendid Fuchsia | Bright indirect light (just back from a sunny window) | Regular during growth; reduce in winter | Pet-safe |
| 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 |
| Spotted Joe Pye Weed | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water weekly or more in dry spells | 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 |
| Stachyurus praecox | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil begins to dry, roughly every 5-7 days in summer for younger plants | Mildly toxic to pets |
| Staggerbush | Bright indirect light (just back from a sunny window) | Regularly — keep soil consistently moist, especially in the first 2 years | Toxic to pets |
| Stalked Clivia | Bright indirect light (just back from a sunny window) | Water regularly in spring and summer; reduce significantly in autumn and winter. | Toxic to pets |
| 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 |
| Star Apple | 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 |
| 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-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 |
| Starfruit | Direct sun (at least 4-6 hours) | Every 3-7 days, keeping soil consistently moist; carambola is not drought-tolerant | Toxic to pets |
| 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 |
| Stem-forming Torch Lily | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days during the growing season | Mildly toxic to pets |
| Stenake's Wax Plant | Bright indirect light (just back from a sunny window) | Once or twice a week in summer; reduce in winter | Pet-safe |
| Stepladder Ginger | Medium indirect light (a couple of metres from a window) | Regular but drought tolerant once established | 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 |
| 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 |
| Stilt Palm | Bright indirect light (just back from a sunny window) | Keep consistently moist; water every 3-5 days in the growing season | Pet-safe |
| Stone Gate Palm | Direct sun (at least 4-6 hours) | Weekly in summer, fortnightly in winter | Pet-safe |
| Stoneham Gold Western Red Cedar | Direct sun (at least 4-6 hours) | Weekly when young; less once established | Mildly toxic to pets |
| Strap-Leaf Anthurium | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm starts to dry | Toxic to pets |
| 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 |
| Strawberry Shake | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| 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 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 Nickels | Bright indirect light (just back from a sunny window) | when top of mix dries out | Mildly 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 Spades | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days | Pet-safe |
| 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 Multicolor | 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 |
| 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 |
| Sugar Palm | Bright indirect light (just back from a sunny window) | When the top 4-6 cm of soil is dry, roughly every 7-10 days in summer; every 14-21 days in winter | Pet-safe |
| 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 |
| Sulphur Sawara Cypress | Bright indirect light (just back from a sunny window) | Regular during establishment; moderate once established | Mildly toxic to pets |
| Sumatra Banana | 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 warm months | Pet-safe |
| Summer Skies delphinium | Direct sun (at least 4-6 hours) | Regular — deep water 2–3 times per week during growth; reduce to weekly after first bloom | Toxic to pets |
| Sunflower | Direct sun (at least 4-6 hours) | Deep watering once a week | 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 |
| 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 |
| Superba Pubescent Lilac | Direct sun (at least 4-6 hours) | When the top 5 cm of soil feels dry, roughly every 7-10 days in the growing season | Mildly toxic to pets |
| 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 Azalea | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; in garden settings water every 5-7 days during dry spells | 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 Rose Mallow | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in summer or more frequently in containers | Pet-safe |
| Swamp Sunflower | Direct sun (at least 4-6 hours) | Consistently moist; water weekly or more in dry periods | Pet-safe |
| Swamp Tupelo | Direct sun (at least 4-6 hours) | Constantly moist to permanently flooded | Mildly toxic to pets |
| Sweet Autumn Clematis | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days once established | Toxic to pets |
| Sweet Autumn Clematis | Direct sun (at least 4-6 hours) | Deeply once a week during the growing season; drought-tolerant once established | Toxic to pets |
| Sweet Azalea | 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 | Toxic to pets |
| 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 Box | Low light (north window or shaded room) | Water regularly while establishing; once settled, every 7-14 days in dry spells | Mildly toxic to pets |
| 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 Mock Orange | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil feels dry, roughly every 7-14 days | Mildly toxic to pets |
| Sweet pea | Direct sun (at least 4-6 hours) | Weekly deep watering | 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 |
| 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 |
| Sweetheart plant | Bright indirect light (just back from a sunny window) | When soil is dry, every 14-21 days | Pet-safe |
| Swiss cheese vine | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 5-7 days | Toxic to pets |
| 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 |
| Sycamore Maple | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water young trees weekly for the first 2 years | Toxic to pets |
| Sylvester Date Palm | Direct sun (at least 4-6 hours) | Deeply every 7-14 days while establishing, then drought-tolerant | Pet-safe |
| Syngonium 'Strawberry Ice' | 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 |
| Syngonium 'Three Kings' | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of soil are dry, roughly weekly in summer | Toxic to pets |
| Syngonium 'White Butterfly' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Syngonium Albo Variegatum | 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 |
| Syngonium macrophyllum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Syngonium Neon Robusta | 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 |
| Syngonium Neon Robusta (Pink Arrowhead) | Bright indirect light (just back from a sunny window) | Every 7-10 days in growth; less in winter | Toxic to pets |
| Syngonium Pink Splash | 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 |
| 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 |
| Taiwan Podocarpus | 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 |
| 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 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 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 |
| Tampoi | Bright indirect light (just back from a sunny window) | 2–3 times per week; maintain consistently moist soil | Mildly 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 |
| Taraw Palm | Direct sun (at least 4-6 hours) | Regularly during establishment; moderately once mature | Pet-safe |
| Tartarian Honeysuckle | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days once established | Toxic to pets |
| Tasmanian Tree Fern | Bright indirect light (just back from a sunny window) | Keep consistently moist — water when the top 3-4 cm of soil or fibrous trunk surface feels dry, typically every 3-7 days | Pet-safe |
| Tea Tree Bonsai | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the surface just begins to dry, often every 1-3 days in summer | Mildly toxic to pets |
| Teasing Georgia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | 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 Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil dries out, roughly every 7-14 days depending on conditions | Pet-safe |
| Tellmann's honeysuckle | Medium indirect light (a couple of metres from a window) | Weekly during dry spells; especially important in summer while in active growth | Mildly toxic to pets |
| 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 |
| Terap | Direct sun (at least 4-6 hours) | Every 3–5 days when young; established trees every 7–10 days | Mildly toxic to pets |
| 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 |
| Tetrastigma voinierianum | 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 |
| Thai Mountain Palm | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer, fortnightly in cooler months | Pet-safe |
| Thalictrum 'Elin' | Bright indirect light (just back from a sunny window) | Keep soil reliably moist; water deeply 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 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 Generous Gardener Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more during establishment and in heat | Pet-safe |
| The Pilgrim Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat | Pet-safe |
| The Rocket Ligularia | Medium indirect light (a couple of metres from a window) | Keep soil constantly moist; water deeply 2-3 times weekly in summer, daily in heat or dry spells | Mildly toxic to pets |
| Therese Bugnet Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Thin-Leaved Sunflower | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks; keep moderately moist | Pet-safe |
| Thorn Apple | Direct sun (at least 4-6 hours) | Moderate, once or twice a week in dry spells | 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 |
| 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 Sawara Cypress | Direct sun (at least 4-6 hours) | Once per week to every 10 days when the top 2-3 cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Three-leaved Lantana | Direct sun (at least 4-6 hours) | Every 1–2 weeks | Toxic to pets |
| Thunberg Spirea | Direct sun (at least 4-6 hours) | Weekly until established; occasional deep watering thereafter | Pet-safe |
| Thunberg's Cycad | Direct sun (at least 4-6 hours) | Every 14–21 days; drought-tolerant once established | Toxic to pets |
| Thunbergia erecta | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days in growth | Mildly toxic to pets |
| Thunbergia grandiflora | Bright indirect light (just back from a sunny window) | Keep the soil consistently moist in growth; reduce in winter | 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 |
| Thyrse Ginger Lily | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly every 5-8 days in summer; every 12-14 days 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 Lily | Direct sun (at least 4-6 hours) | When top 3 cm of soil is dry | Toxic to pets |
| Tiger Orchid | Bright indirect light (just back from a sunny window) | Abundant in growth (every 1-3 days); much drier in rest | Mildly 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 |
| Titan Arum | Bright indirect light (just back from a sunny window) | Keep evenly moist while in leaf; reduce sharply during dormancy | Toxic to pets |
| Toad Tree | Direct sun (at least 4-6 hours) | Moderate; water regularly in summer, reduce significantly in winter dormancy | Toxic to pets |
| Toe toe | Direct sun (at least 4-6 hours) | Once or twice a week during establishment; monthly once established | Pet-safe |
| Toilet Pitcher Plant | Bright indirect light (just back from a sunny window) | Regularly — keep medium evenly moist | 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 |
| Tommy Atkins Mango | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil dries in growth; withhold before flowering | 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 |
| Toothed Fuchsia | Bright indirect light (just back from a sunny window) | Regular — keep evenly moist | Pet-safe |
| Toothpick plant | Direct sun (at least 4-6 hours) | Every 6–9 days; drought-tolerant when established | Mildly toxic to pets |
| 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 Ginger | Bright indirect light (just back from a sunny window) | 2–3 times per week; more during dry spells | Mildly 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 |
| 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 |
| Trachycarpus Latisectus | Bright indirect light (just back from a sunny window) | Regularly through the growing season; keep evenly moist but never soggy | Pet-safe |
| Trachycarpus Takil | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in summer; reduce sharply over winter | Pet-safe |
| Trailing Abutilon | Bright indirect light (just back from a sunny window) | Freely in growth (spring–autumn); sparingly in winter | Mildly toxic to pets |
| Trailing Lantana | Direct sun (at least 4-6 hours) | Every 1–2 weeks (drought-tolerant when established) | Toxic to pets |
| Transparent Moor Grass | Direct sun (at least 4-6 hours) | Every 7-14 days; keep moderately moist | Pet-safe |
| Transparent Tall Moor Grass | Bright indirect light (just back from a sunny window) | Weekly during establishment; less once settled | Pet-safe |
| Traveller's Palm | Direct sun (at least 4-6 hours) | Consistently moist during spring and summer; reduced in winter | Pet-safe |
| Tree Fuchsia | Bright indirect light (just back from a sunny window) | Every 5-7 days in summer, reducing to every 14 days in winter | Pet-safe |
| Tree heath | Direct sun (at least 4-6 hours) | Fortnightly during the first growing season; drought-tolerant once established | Pet-safe |
| Tree Houseleek | Direct sun (at least 4-6 hours) | Every 1-2 weeks in active growth (autumn-spring); roughly every 3 weeks or less during summer dormancy | Mildly toxic to pets |
| 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 philodendron | 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 |
| 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 |
| Tree-Like Pilosocereus | Direct sun (at least 4-6 hours) | When soil is dry to mid-depth, roughly every 10-14 days in summer; monthly in winter | Pet-safe |
| Trewithen Blue Ceanothus | Direct sun (at least 4-6 hours) | Every 7-10 days during establishment; established plants are drought-tolerant and need supplemental watering only in prolonged dry periods in summer | Mildly toxic to pets |
| Triangle Fern | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist during the growing season; water when the top 2-3 cm begins to dry | Toxic to pets |
| Triangle Fig | 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 |
| 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 |
| Tricolor Ti Plant | 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 |
| Trident Maple | Direct sun (at least 4-6 hours) | Water when the top of the soil begins to dry; bonsai often need daily water in summer | Mildly toxic to pets |
| Trident Maple 'Kifu' | Direct sun (at least 4-6 hours) | When the surface begins to dry, frequently once or twice daily in summer heat | Mildly toxic to pets |
| Tropaeolum majus 'Jewel of Africa' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days; containers more often in heat | Pet-safe |
| Tropic Snow Dumb Cane | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14–18 days in winter | Toxic to pets |
| 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 Pitcher Plant 'Ventrata' | Bright indirect light (just back from a sunny window) | Keep mix evenly moist; water every few days, not standing in a deep tray | Pet-safe |
| Tropical Sage | Medium indirect light (a couple of metres from a window) | Regular while establishing; reduced once established | Pet-safe |
| True lily | Bright indirect light (just back from a sunny window) | Keep evenly moist while growing, every 5-7 days | Toxic to pets |
| Tsao-Ko Cardamom | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 1 cm dries, roughly every 4-7 days | Mildly toxic to pets |
| Tsubo Bamboo Grass | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer, once a week in winter | Pet-safe |
| Tsuboii Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer, reduce in autumn and winter | Pet-safe |
| Tuckers King Palm | 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 |
| Tuerckheim Canna | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water every 4-6 days during warm months | Pet-safe |
| Tufted Vetch | Direct sun (at least 4-6 hours) | Low to moderate — tolerates periodic dry spells once established | Mildly toxic to pets |
| Turk's Cap Lily | Bright indirect light (just back from a sunny window) | Regular during active growth in spring and summer; keep soil consistently moist but not waterlogged | 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 Fir | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry for young trees, roughly every 10-14 days in the first 2-3 years | Mildly toxic to pets |
| Turquoise Puya | Direct sun (at least 4-6 hours) | weekly in summer, monthly in winter | Pet-safe |
| 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 |
| 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 |
| Typha angustifolia | Direct sun (at least 4-6 hours) | Keep permanently wet; grow in standing water up to about 30-50 cm deep or saturated soil | Mildly toxic to pets |
| Typha latifolia | Direct sun (at least 4-6 hours) | Keep permanently wet; grow in standing water 0-30 cm deep or in saturated soil | Mildly toxic to pets |
| Typhonodorum lindleyanum | Direct sun (at least 4-6 hours) | Permanently submerged or saturated; never let it dry | Toxic to pets |
| Ugni | 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 |
| Ukhrul Fan Palm | Bright indirect light (just back from a sunny window) | Weekly during the growing season, reduced in winter | Pet-safe |
| 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 |
| Umbrella Tree | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days; let the top 2-3 cm of soil dry between waterings | Toxic to pets |
| Unscented Dendrobium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; nearly dry in the winter rest (October–February) | Pet-safe |
| 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 Plum Yew | 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 | Mildly toxic to pets |
| Uvaia | Direct sun (at least 4-6 hours) | Weekly; keep consistently moist during establishment, more drought-tolerant once mature | Pet-safe |
| Valdivia Bamboo | Medium indirect light (a couple of metres from a window) | 2-3 times per week in active growth; weekly or less in cool wet winters | Pet-safe |
| Valentine's Crown Vetch | Direct sun (at least 4-6 hours) | Low to moderate — once every 2–3 weeks when established | Toxic to pets |
| Vallisneria gigantea | Medium indirect light (a couple of metres from a window) | Submerged aquatic; keep continuously underwater with a 25-30% water change weekly | Mildly toxic to pets |
| Vanda 'Miss Joaquim' | Direct sun (at least 4-6 hours) | Daily in warm, bright conditions; every 2-3 days if cooler | Pet-safe |
| Vanilla Orchid | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm of medium is dry, roughly every 5-7 days in summer; every 10-14 days in winter | 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 |
| Vanuatu Fan Palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-9 days | Pet-safe |
| Variegated Cord Grass | Direct sun (at least 4-6 hours) | Keep consistently moist to wet; never let it dry out | Mildly toxic to pets |
| 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 top 3–4 cm of soil is dry, roughly every 10–14 days in summer and every 3–4 weeks in winter | Pet-safe |
| Variegated Giant Reed | Direct sun (at least 4-6 hours) | Frequently; keep consistently moist | Mildly 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 Hiba Arborvitae | Bright indirect light (just back from a sunny window) | Once every 7-10 days, keeping soil consistently moist but not waterlogged | Toxic to pets |
| Variegated Incense Cedar | Direct sun (at least 4-6 hours) | Once every 10-14 days once established; more frequently in its first two seasons | Mildly toxic to pets |
| Variegated Lady Palm | 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 |
| Variegated Monstera Albo | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Variegated pieris | Bright indirect light (just back from a sunny window) | Weekly; do not allow soil to dry out | Toxic to pets |
| Variegated Shell Ginger | Bright indirect light (just back from a sunny window) | Consistently moist year-round; reduce slightly in winter | Mildly toxic to pets |
| Variegated Shell Ginger | 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 |
| variegated silver grass | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in autumn and winter | Pet-safe |
| 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 Sweetheart Hoya | Bright indirect light (just back from a sunny window) | When the mix is almost fully dry, every 2-3 weeks | Pet-safe |
| Vazquez's Zamia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer; every 14–21 days in winter | Toxic to pets |
| 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 |
| Veitchia Arecina | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-9 days in heat | Pet-safe |
| 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 Leaf Philodendron | 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 |
| 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 |
| Velvet Sage | Bright indirect light (just back from a sunny window) | Weekly | Pet-safe |
| Velvet Tamarind | Direct sun (at least 4-6 hours) | When the top 2-4 cm of soil is dry, roughly every 4-7 days in growth | 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 |
| Verticillata Wax Plant | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; when the top 3cm of mix is dry | Pet-safe |
| Veterans' Honor Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Victoria amazonica | Direct sun (at least 4-6 hours) | Permanently submerged in warm, still water 0.5-1 m+ deep | Mildly toxic to pets |
| Victoria cruziana | Direct sun (at least 4-6 hours) | Permanently submerged in warm, still water 0.5-1 m+ deep | Mildly toxic to pets |
| Vilmorin's rowan | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Mildly toxic to pets |
| Violet-Flowered Sage | Direct sun (at least 4-6 hours) | Every 7 days in summer; every 14–21 days in winter | Mildly toxic to pets |
| Virgin's Bower | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days once established | Toxic to pets |
| 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 |
| Wagner's Sage | Bright indirect light (just back from a sunny window) | Water regularly to maintain consistent moisture | Pet-safe |
| Wagners Windmill Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days depending on season | Pet-safe |
| Wallichii Staghorn Fern | Bright indirect light (just back from a sunny window) | When the shield fronds and mounting medium feel dry, roughly every 7-10 days in summer | 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 |
| Wandae Staghorn Fern | Bright indirect light (just back from a sunny window) | Soak when the mount approaches dryness, roughly weekly in summer and every 1-2 weeks in winter | Pet-safe |
| 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 |
| Water Apple | Direct sun (at least 4-6 hours) | 2–3 times per week; keep consistently moist | Mildly toxic to pets |
| Water Canna | Direct sun (at least 4-6 hours) | Aquatic marginal — roots in 0-30 cm of standing water | Mildly toxic to pets |
| Water Tupelo | Direct sun (at least 4-6 hours) | Constant to seasonally flooded; extremely wet tolerant | Mildly toxic to pets |
| Waterberg Cycad | Direct sun (at least 4-6 hours) | Every 3–5 weeks | Toxic to pets |
| 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 |
| Weaver's Bamboo | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week; daily in hot weather | Pet-safe |
| 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 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 Eastern Hemlock | 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 | Mildly toxic to pets |
| Weeping European Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; less once established | Pet-safe |
| Weeping European Larch | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days during the growing season | Mildly toxic to pets |
| 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 Japanese Larch | Direct sun (at least 4-6 hours) | Once every 7-10 days during the growing season; reduce in winter when dormant | Mildly toxic to pets |
| Weeping Nootka Cypress | Direct sun (at least 4-6 hours) | Regularly during establishment; moderate once mature | Pet-safe |
| Weeping Nootka Cypress | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days for young plants | Mildly toxic to pets |
| 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 Podocarpus | 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 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 |
| Weigela 'Eva Rathke' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil feels dry, roughly every 7-10 days in the growing season | Mildly toxic to pets |
| Weigela 'Florida Purpurea' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season | Mildly toxic to pets |
| Weigela 'Red Prince' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days during active growth | Mildly toxic to pets |
| Weigela 'Wine & Roses' | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry, about weekly while establishing | Pet-safe |
| Welwitsch's Anchomanes | Medium indirect light (a couple of metres from a window) | Every 7–10 days in active growth; cease watering during dry-season dormancy | Toxic to pets |
| Welwitsch's Anchomanes | Medium indirect light (a couple of metres from a window) | Keep evenly moist during the growing season; reduce to minimal watering during dormancy | Toxic to pets |
| West Indian Tree Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil feels just dry, roughly every 5-7 days in warm weather | 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 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 Spirea | Direct sun (at least 4-6 hours) | Every 5-7 days or as needed to keep soil consistently moist | Pet-safe |
| 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 |
| Wheki Tree Fern | Medium indirect light (a couple of metres from a window) | Consistently moist — water deeply 2-3 times per week in dry periods during the growing season | Pet-safe |
| White Ash | Direct sun (at least 4-6 hours) | Moderate; water weekly when young; moderate drought tolerance once established | Mildly toxic to pets |
| White bird of paradise | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, every 7-10 days | Toxic to pets |
| White Bird of Paradise | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days depending on season and temperature | Mildly toxic to pets |
| 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 double camellia | Bright indirect light (just back from a sunny window) | Regularly throughout the year; moisture critical in summer and autumn | Mildly toxic to pets |
| White Enkianthus | Bright indirect light (just back from a sunny window) | Regularly; soil should stay evenly moist | 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 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 Ginger Lily | Bright indirect light (just back from a sunny window) | Keep soil consistently moist, watering roughly every 3-5 days during active growth | Pet-safe |
| White Grand Lotus | Direct sun (at least 4-6 hours) | Aquatic — permanently in still or slow-moving water | 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 Knight Philodendron | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 7-10 days | Toxic to pets |
| White Lotus Lily | Direct sun (at least 4-6 hours) | Fully aquatic; roots submerged, leaves floating or emergent | Mildly toxic to pets |
| 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 Passionflower | Direct sun (at least 4-6 hours) | Once a week during dry spells; less in winter | Pet-safe |
| 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 Shrimp Plant | Bright indirect light (just back from a sunny window) | When the top 2–3 cm (1 in) of compost dries out | Mildly 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 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 Water Lily | Direct sun (at least 4-6 hours) | Permanent aquatic — always submerged in 45-90 cm of water | Mildly toxic to pets |
| White Water Lily | Direct sun (at least 4-6 hours) | Aquatic — grows permanently submerged or in standing water | 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 Wizard Philodendron | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 7-10 days | 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-Branch Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| White-Lip Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 14–21 days in winter rest | Pet-safe |
| White-Powder Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; fortnightly when dormant | Pet-safe |
| Whitelock's Ceratozamia | Medium indirect light (a couple of metres from a window) | Weekly to every 10 days in growing season; reduce in winter | Toxic to pets |
| Whorled Heath | Direct sun (at least 4-6 hours) | Infrequent once established; drought-tolerant | Mildly toxic to pets |
| Whorled Rosinweed | Bright indirect light (just back from a sunny window) | Every 1-2 weeks once established | Pet-safe |
| Whorled Water Milfoil | Direct sun (at least 4-6 hours) | Permanently submerged | Pet-safe |
| Wide-Bract Heliconia | Direct sun (at least 4-6 hours) | Regularly during growing season; withhold water for 4–6 weeks in autumn/winter to trigger flowering | 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 Edric Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season, more in heat or sandy soil | Pet-safe |
| Wild Garlic Vine | Direct sun (at least 4-6 hours) | Every 5–7 days during the growing season; reduce in cooler months | Mildly toxic to pets |
| Wild jasmine | Bright indirect light (just back from a sunny window) | Once or twice a week during active growth; reduce in winter | Pet-safe |
| Wild maracuja | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Mildly toxic to pets |
| Wild Pineapple | Direct sun (at least 4-6 hours) | Every 7–14 days; very drought-tolerant once established | Mildly toxic to pets |
| Wild Plantain Heliconia | Bright indirect light (just back from a sunny window) | Every 4–6 days during active growth; reduce in cooler months | Mildly toxic to pets |
| Wild Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then rarely once mature | Pet-safe |
| Wild Senna | Bright indirect light (just back from a sunny window) | Weekly in dry periods; tolerates brief flooding | Mildly toxic to pets |
| 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 |
| Wildfire Black Tupelo | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Mildly toxic to pets |
| Williams rhododendron | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; reduce to monthly in winter | Toxic to pets |
| Willow Oak | Direct sun (at least 4-6 hours) | Moderate; water weekly when young; tolerates periodic flooding once established | Mildly toxic to pets |
| 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 |
| 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 |
| Wine-Colored Alcantarea | Direct sun (at least 4-6 hours) | Keep the central tank filled with fresh water; water the root zone when the top 3-4 cm is dry, roughly every 7-14 days | 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 |
| Winterberry Holly 'Winter Red' | Direct sun (at least 4-6 hours) | Keep consistently moist; water regularly in dry spells | Toxic to pets |
| Wintergreen Barberry | Bright indirect light (just back from a sunny window) | When the top 5-8 cm of soil is dry, roughly every 10-14 days | Mildly 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 |
| 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 |
| 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 |
| Wonderful Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season, monthly in winter | Pet-safe |
| 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 small-reed | Direct sun (at least 4-6 hours) | Drought-tolerant once established; occasional deep watering in first season | Pet-safe |
| Wood Vetch | Medium indirect light (a couple of metres from a window) | Low to moderate — prefers moderate moisture with periods of drying | Mildly 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 Sunflower | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks; drought-tolerant once established | Pet-safe |
| 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 Heliconia | Bright indirect light (just back from a sunny window) | 2–3 times per week throughout the year; near-continuous in tropical gardens | 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 |
| 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 |
| Xanadu Philodendron | 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 |
| Xanthosoma 'Lime Zinger' | Bright indirect light (just back from a sunny window) | Keep consistently moist; water when the top 2-3 cm is dry, often every 3-6 days in active growth | Toxic to pets |
| Xanthosoma Albomarginatum | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 2-3 cm starts to dry | Toxic to pets |
| Xanthosoma Atrovirens | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 2-3 times weekly in heat | Toxic to pets |
| Xanthosoma Robustum | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 2-3 times weekly | 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 |
| 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 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 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 False Jasmine | Bright indirect light (just back from a sunny window) | Water every 7-10 days during the growing season; reduce to every 2-3 weeks once established and dormancy slows growth | Toxic to pets |
| Yellow Firethorn | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days | Mildly toxic to pets |
| Yellow Gentian | Direct sun (at least 4-6 hours) | Regular; keep evenly moist during the growing season — never allow to fully dry out | Mildly 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 Ginger Lily | Bright indirect light (just back from a sunny window) | Generously during the growing season; greatly reduced in winter dormancy | Mildly toxic to pets |
| Yellow Ginger Lily | 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 summer; reduce to every 10-14 days in winter | 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 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 Latan Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Yellow Marliac Water Lily | Direct sun (at least 4-6 hours) | Permanently aquatic — crown submerged 15–75 cm (6–30 in) below water surface | Pet-safe |
| Yellow Mombin | Direct sun (at least 4-6 hours) | Every 7–14 days; highly drought-tolerant when established | Pet-safe |
| Yellow Mussaenda | Direct sun (at least 4-6 hours) | Every 7 days during summer; reduce significantly in winter | Mildly toxic to pets |
| 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 Pitaya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 2-4 weeks in winter | Pet-safe |
| 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 Trumpet Vine | Direct sun (at least 4-6 hours) | Every 5–7 days during active growth; reduce in cooler months | 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-Twig Dogwood | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | Pet-safe |
| Yesterday-Today-and-Tomorrow | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top of the soil starts to dry, roughly 1-2x per week in growth. | Toxic to pets |
| 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 |
| 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 |
| Yuletide Sasanqua Camellia | Bright indirect light (just back from a sunny window) | Every 5-7 days in summer; reduce in winter but do not let dry out | Pet-safe |
| Yunnan Cypress | Direct sun (at least 4-6 hours) | Regular during establishment; drought-tolerant once mature | Pet-safe |
| Za Baobab | Direct sun (at least 4-6 hours) | Twice weekly in summer; once a month or less in winter | 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 |
| Zamia Roezlii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 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 | Bright indirect light (just back from a sunny window) | Keep evenly moist; water little and often, roughly when the top third of the mix dries | Pet-safe |
| Zebrinus Zebra Grass | Direct sun (at least 4-6 hours) | Weekly while establishing, then during dry spells; appreciates steady moisture | Mildly toxic to pets |
| Zephirine Drouhin Rose | Direct sun (at least 4-6 hours) | Deeply once a week in the growing season; more in heat or during establishment | Pet-safe |
| Zigzag Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; fortnightly in winter | Pet-safe |
| Zombie Palm | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 21–28 days in winter | Pet-safe |
| Zuiko Nishiki Lady Palm | 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 |
| Zulu Spurflower | Medium indirect light (a couple of metres from a window) | Moderate — water twice weekly in containers; less frequently in ground | Mildly toxic to pets |
It is documented mature indoor height of 1.5 metres or more — the species that actually become floor-anchor statement plants over a few years. Growli's library currently lists 3319 plants that fit that profile, and the list will grow as the library grows. Match a plant to the room's reality, not a generic "best of" guess.
Not necessarily — this list is selected for a large floor plant, not by pet safety. Each plant below shows its ASPCA toxicity status in the table; tap any plant for its full pet-safety guide. If pets share the room, cross-check this list with the dedicated pet-safe library.
It depends on the species, not the room. The plants below are picked to fit a large floor plant's natural conditions, so most do not need extra humidity beyond a pebble tray or grouping with other plants.
Each plant on this list reaches at least 1.5 metres at maturity indoors. Many can hit 2–3 m given enough light and a moss pole or stake. Plan for the eventual silhouette, not the size you bring home.