| 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 |
| Acer rubrum | Direct sun (at least 4-6 hours) | Deep soak weekly for the first two seasons; established trees rely on rainfall | Mildly toxic to pets |
| Acer rubrum 'Autumn Blaze' | Direct sun (at least 4-6 hours) | Weekly while establishing; deep watering in droughts thereafter | Pet-safe |
| Acer rubrum 'October Glory' | Direct sun (at least 4-6 hours) | Weekly while establishing; deep watering in dry spells thereafter | Pet-safe |
| Acerola | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days in growth | Mildly toxic to pets |
| Achachairu | Bright indirect light (just back from a sunny window) | Water abundantly and consistently year-round; do not allow to dry out. | Mildly toxic to pets |
| Achillea millefolium 'Cerise Queen' | Direct sun (at least 4-6 hours) | When the top few centimeters of soil are dry, about every 7-14 days | Mildly toxic to pets |
| Achillea ptarmica 'The Pearl' | Direct sun (at least 4-6 hours) | When the top few cm of soil dry out; roughly weekly, more in heat | Toxic to pets |
| Achimenes 'Tarantella' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, roughly every 4-6 days | Pet-safe |
| Adriatic Bellflower | Bright indirect light (just back from a sunny window) | Weekly during spring and summer; minimal in winter | Pet-safe |
| Aesculus hippocastanum | Direct sun (at least 4-6 hours) | Water young trees weekly to establish, then rely on rainfall | Toxic to pets |
| African Cornflag | Direct sun (at least 4-6 hours) | Weekly during the winter-spring growing season; none in summer dormancy | Mildly toxic to pets |
| African feather grass | Direct sun (at least 4-6 hours) | Every 1–2 weeks once established; more frequently when newly planted | Pet-safe |
| 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 Violet 'Optimara EverFloris' | Bright indirect light (just back from a sunny window) | When the top of the soil feels just dry, about every 5-7 days | Pet-safe |
| Agastache 'Black Adder' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-14 days once established | Mildly toxic to pets |
| 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 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 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 |
| Aglaonema Golden Bay | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Prosperity | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| 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 |
| Alan Fradd Rock Rose | Direct sun (at least 4-6 hours) | Establish with deep, infrequent waterings in the first season; drought-tolerant once established and needs no irrigation in typical UK summers. | Mildly toxic to pets |
| 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 |
| 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 |
| 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 |
| 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 Gageana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Toxic to pets |
| Alocasia 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 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 Sarian | Bright indirect light (just back from a sunny window) | Roughly weekly in spring/summer; water when the top 25-50% of the soil has dried | Toxic to pets |
| Alocasia Sumo | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-8 days in growth | Toxic to pets |
| Aloe 'Blue Elf' | Direct sun (at least 4-6 hours) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe 'Doran Black' | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe 'Hercules' | Direct sun (at least 4-6 hours) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe Burgersfortensis | Direct sun (at least 4-6 hours) | When the mix has dried out, roughly every 2 weeks in summer | Toxic to pets |
| Aloe Longibracteata | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry — roughly every 1-2 weeks in summer, sparingly 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 Vanbalenii | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in summer and monthly in winter | Toxic to pets |
| 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 Puya | Direct sun (at least 4-6 hours) | Moderate in summer, very sparing in winter | Mildly toxic to pets |
| Alpine Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| 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 |
| Ambarella | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant when established | Pet-safe |
| 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 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 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 Lady Fern | Low light (north window or shaded room) | Every 2–3 days during active growth; less frequently in winter | Pet-safe |
| American wisteria | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once mature | Toxic to pets |
| Amethyst Porroglossum | Medium indirect light (a couple of metres from a window) | Daily if mounted; every 1–2 days if potted; do not dry out | Pet-safe |
| Amphibious Bistort | Direct sun (at least 4-6 hours) | Permanent wet soil or shallow water — no irrigation needed once established | Mildly 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 |
| Anemone × hybrida 'Königin Charlotte' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply once a week in dry weather, more while establishing | Toxic to pets |
| 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 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 |
| Angelina Stonecrop | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in summer; little to none in winter | Pet-safe |
| Angelonia angustifolia 'Archangel White' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Anise-scented Sage | Bright indirect light (just back from a sunny window) | Regular throughout the growing season | Pet-safe |
| Annual Clary | Direct sun (at least 4-6 hours) | Every 7–10 days | Mildly toxic to pets |
| Anthurium andraeanum 'Colonel' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Toxic to pets |
| Anthurium andraeanum 'President' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Toxic to pets |
| Anthurium andraeanum 'Sierra Madre' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 5-7 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 Dark Mama | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is just dry, roughly every 5-9 days | Toxic to pets |
| Anthurium Magnificum × Crystallinum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is just dry, roughly every 5-9 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 Pedatum | 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 subsignatum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix dries, about every 5-8 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 |
| Anubias congensis | Low light (north window or shaded room) | Submerged full-time; change 20-30% of tank water weekly | Mildly toxic to pets |
| Aptos Blue Redwood | Direct sun (at least 4-6 hours) | Weekly when young; every 1–2 weeks when established | Pet-safe |
| Aquilegia 'Black Barlow' | Medium indirect light (a couple of metres from a window) | Water when the top 3 cm of soil dries, roughly weekly | Mildly toxic to pets |
| 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 |
| Argentine Giant Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 1-2 weeks in summer; keep dry in winter | Pet-safe |
| Arisaema tortuosum | Medium indirect light (a couple of metres from a window) | Keep moist through the growing season, about every 4-7 days; reduce as it dies back | 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 |
| Artillery Plant | Bright indirect light (just back from a sunny window) | When the top 1-2 cm (about half an inch) of soil is dry | Pet-safe |
| Arum Lily | Bright indirect light (just back from a sunny window) | Regularly moist to wet — water every 2–3 days or plant in standing water | Toxic to pets |
| Assai Palm | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in warm weather | Pet-safe |
| Aster 'Hella Lacy' | 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 |
| Aster 'Little Carlow' | 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 |
| Aster 'Raydon's Favorite' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Aster × frikartii 'Mönch' | Direct sun (at least 4-6 hours) | Water to establish, then moderately; water in prolonged dry spells | Pet-safe |
| Atemoya | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm dries; keep steady during fruiting | Mildly toxic to pets |
| Athyrium angustum f. rubellum 'Lady in Red' | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist, watering when the top 2-3 cm dries, roughly every 4-6 days | Mildly toxic to pets |
| Athyrium niponicum 'Ursula's Red' | Low light (north window or shaded room) | Keep evenly moist; water every 4-6 days, increasing in hot weather | Mildly toxic to pets |
| Audray White globe amaranth | Direct sun (at least 4-6 hours) | Every 5–7 days; drought-tolerant once established | Pet-safe |
| Audrey Fig | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| 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 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 Crocus | Direct sun (at least 4-6 hours) | Low — naturally rainfall-dependent; needs dry summer dormancy | Mildly toxic to pets |
| Azolla filiculoides | Direct sun (at least 4-6 hours) | Floats permanently on still water; no separate watering | Mildly toxic to pets |
| Baby's Tears | Bright indirect light (just back from a sunny window) | Every 2-4 days; keep soil consistently moist | Pet-safe |
| Bacopa 'Scopia Gulliver Purple' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost starts to dry, often daily in warm weather | Pet-safe |
| 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 |
| Balisier Heliconia | Bright indirect light (just back from a sunny window) | Every 5–7 days; soil should remain evenly moist | Mildly toxic to pets |
| Balkan Saxifrage | Direct sun (at least 4-6 hours) | Low — water at the base only; allow near-drying between waterings | Pet-safe |
| 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 |
| 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 |
| Baptisia 'Purple Smoke' | Direct sun (at least 4-6 hours) | Weekly the first season; minimal once established | 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 |
| Basket Plant | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of soil is dry, about every 7-12 days | Toxic to pets |
| Basketgrass | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Beach Cabbage | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Mildly toxic to pets |
| Beacon Silver Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–10 days; water more frequently in sunny or dry situations | Pet-safe |
| Bearberry Cotoneaster | Direct sun (at least 4-6 hours) | Fortnightly once established; more frequent for the first growing season | Mildly toxic to pets |
| Bee Balm 'Cambridge Scarlet' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Pet-safe |
| Begonia 'Bonfire' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, often daily in summer baskets | Toxic to pets |
| Begonia 'Buxton's Crimson' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 5-7 days | Toxic to pets |
| Begonia 'Cleopatra' | 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 |
| 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 'Cowardly Lion' | 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 |
| Begonia 'Dragon Wing Pink' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Begonia 'Dragon Wing Red' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer containers | Toxic to pets |
| Begonia 'Emerald Giant' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Begonia 'Fiestas' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Begonia 'Flamingo Queen' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 5-7 days | Toxic to pets |
| Begonia 'Gryphon' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Begonia '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 'Jurassic Silver Swirl' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| 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 'Orange Rubra' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Begonia 'Santa Cruz Sunset' | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 3-5 days in summer | 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 'Thurstonii' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Begonia 'Torch' | 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 × erythrophylla | 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 |
| Begonia × semperflorens-cultorum 'Dragon Wing Red' | 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 containers in summer | Toxic to pets |
| Begonia heracleifolia | 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 |
| Begonia metallica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 4-7 days | Toxic to pets |
| Begonia sizemoreae | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of mix dries slightly, about every 5-7 days | Toxic to pets |
| 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 |
| 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 Enkianthus | Bright indirect light (just back from a sunny window) | Regular — keep consistently moist | Toxic to pets |
| Bergeranthus multiceps | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly every 7-10 days in active growth; reduce in peak summer and winter | Mildly toxic to pets |
| Berry Smoothie Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| 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 |
| 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 |
| Bidens ferulifolia 'Campfire Fireburst' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in summer containers | Pet-safe |
| Big Kiss Yellow Flame Gazania | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | 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 |
| 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 |
| Billbergia amoena | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Billbergia pyramidalis | Bright indirect light (just back from a sunny window) | Keep the central cup topped up; water the mix when its top 2-3 cm is dry, about weekly in growth | Pet-safe |
| Billbergia venezuelana | Bright indirect light (just back from a sunny window) | Keep the central tube topped up; water the mix when its top 2-3 cm is dry, about weekly in growth | 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 of Llandaff Dahlia | Direct sun (at least 4-6 hours) | 2–3 times per week in summer | Mildly toxic to pets |
| 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 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 Scallop Bugle | Medium indirect light (a couple of metres from a window) | Once or twice weekly; reduce to once weekly when established | Mildly toxic to pets |
| Black-Eyed Susan | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Mildly toxic to pets |
| Black-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 |
| Bladder Cherry | Direct sun (at least 4-6 hours) | Weekly in the first season; established plants tolerate moderate drought | Toxic to pets |
| 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 |
| Blechum brownei | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 3-5 days in warm growth | Mildly toxic to pets |
| 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 |
| Blonde Ambition Rush | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet at all times | Pet-safe |
| Blood Banana | Direct sun (at least 4-6 hours) | Roughly weekly in active growth; every 10-14 days in winter | Pet-safe |
| Blood-red trumpet vine | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established. | Mildly toxic to pets |
| Bloodleaf Plant | Bright indirect light (just back from a sunny window) | Every 7 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Blue blossom | Direct sun (at least 4-6 hours) | Weekly during establishment; minimal irrigation once established (drought-tolerant) | Mildly 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 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 Lyme Grass | Direct sun (at least 4-6 hours) | Drought-tolerant; water only in prolonged dry spells once established | Mildly toxic to pets |
| Blue Melon Cactus | 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 3-4 weeks in winter | Pet-safe |
| Blue Mistflower | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water weekly, more in heat or sandy soil | Mildly toxic to pets |
| Blue 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 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 Rug Juniper | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Blue Spruce Stonecrop | Direct sun (at least 4-6 hours) | Every 14-21 days in spring and summer; monthly or less in winter | Pet-safe |
| Blue Spurflower | Medium indirect light (a couple of metres from a window) | Moderate — water once or twice weekly in summer; reduce significantly in winter | Mildly toxic to pets |
| Blue Star Water Lily | Direct sun (at least 4-6 hours) | Fully aquatic; roots and tuber submerged, leaves and flowers floating or emergent | 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-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 |
| Boivin's Aponogeton | Medium indirect light (a couple of metres from a window) | Permanently submerged; weekly 25% water changes | Pet-safe |
| 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 Sunset | Medium indirect light (a couple of metres from a window) | Every 4–5 days in growth; reduce in dormancy | Mildly toxic to pets |
| Bolivian Torch Cactus | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; once a month or less in winter | Mildly toxic to pets |
| Border Forsythia | Direct sun (at least 4-6 hours) | Weekly during the first year, then only in prolonged drought | Pet-safe |
| 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 '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 |
| Boulder Blue Fescue | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; sparingly once established | Mildly toxic to pets |
| Bow Bells Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; every 10–14 days in winter | Pet-safe |
| Bower Vine | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in cool or dry winter rest | Mildly toxic to pets |
| box honeysuckle | Bright indirect light (just back from a sunny window) | Regularly during the first season; drought-tolerant once established | Mildly toxic to pets |
| Bracted Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in winter | Pet-safe |
| Brandy Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season | Pet-safe |
| Brassia 'Rex' | Bright indirect light (just back from a sunny window) | When the bark surface dries, about every 5-7 days in growth | 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 Waterweed | Bright indirect light (just back from a sunny window) | Permanently submerged | Pet-safe |
| 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 |
| 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 |
| Broad-Leaved Lime | Bright indirect light (just back from a sunny window) | Weekly during establishment; supplemental watering in prolonged drought | Pet-safe |
| Broomsedge Bluestem | Direct sun (at least 4-6 hours) | Rainfall sufficient; no supplemental irrigation needed once established | Pet-safe |
| Brown-eyed Susan | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly weekly, more during drought | Mildly toxic to pets |
| 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 | Medium indirect light (a couple of metres from a window) | Moderate; keep evenly moist but never waterlogged | Pet-safe |
| 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 |
| Bulbophyllum Elizabeth Ann | Medium indirect light (a couple of metres from a window) | Every 2-4 days; keep consistently moist | Pet-safe |
| Bulbophyllum vaginatum | Bright indirect light (just back from a sunny window) | Water as the medium approaches dryness, around every 2-4 days; daily when mounted in heat | Pet-safe |
| Bunny Ear Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 10-14 days in summer; every 4-6 weeks in autumn; once a month or less in winter | Mildly toxic to pets |
| Burgundy Periwinkle | Medium indirect light (a couple of metres from a window) | Weekly during establishment; every 2–3 weeks once established | Toxic to pets |
| 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 |
| 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 |
| 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 |
| Button Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep nearly dry in winter | Pet-safe |
| Byzantine Meadow Saffron | Bright indirect light (just back from a sunny window) | Relies on natural rainfall; needs no supplementary watering once established | Toxic to pets |
| Cabada Palm | Direct sun (at least 4-6 hours) | Every 3–5 days when young; drought-tolerant once established | Pet-safe |
| 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 |
| Caladium 'Red Flash' | Bright indirect light (just back from a sunny window) | Keep evenly moist in leaf, watering when the top 2 cm is dry (often every 4-7 days) | Toxic to pets |
| Calathea 'Flamestar' | Bright indirect light (just back from a sunny window) | Roughly weekly; water when the top 2-3 cm (about 1 inch) of soil feels dry | Pet-safe |
| Calathea Concinna | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Calathea 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 Fasciata | Bright indirect light (just back from a sunny window) | Every 5-7 days, when the top inch of soil is just dry | 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 | 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 |
| Calendula | Direct sun (at least 4-6 hours) | Moderate — roughly weekly once established | Pet-safe |
| Calendula 'Indian Prince' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Calendula 'Radio' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Calibrachoa 'Superbells Lemon Slice' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, often daily in baskets during summer heat | Pet-safe |
| Calibrachoa 'Superbells Trailing Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, frequently daily in summer baskets | 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 |
| California Fawn Lily | Medium indirect light (a couple of metres from a window) | Regular in spring growing season; minimal during summer dormancy | Mildly toxic to pets |
| California poppy | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent during germination | Mildly toxic to pets |
| California Sunset | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn/winter | Pet-safe |
| 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 '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 '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 '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 |
| Camille Dumb Cane | 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 |
| Campanula glomerata 'Superba' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries, about weekly in dry spells | Pet-safe |
| Campanula portenschlagiana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly weekly in summer | Mildly toxic to pets |
| Campanula poscharskyana | Bright indirect light (just back from a sunny window) | When the top few centimetres of soil dry out, weekly in hot spells | Mildly toxic to pets |
| Campanula punctata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry; keep consistently moist in summer | Mildly toxic to pets |
| Campos Porto Fuchsia | Bright indirect light (just back from a sunny window) | Regular during growth; reduce 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 |
| 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 Lavender | Direct sun (at least 4-6 hours) | Every 2 weeks in the growing season; sparingly in winter | Toxic to pets |
| Canary Island Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; minimal in cool or wet periods | Pet-safe |
| Canary Reed Grass | Bright indirect light (just back from a sunny window) | Keep consistently moist to wet; tolerates standing water | 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 '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 'The President' | Direct sun (at least 4-6 hours) | Water every 2-3 days in summer to maintain evenly moist soil | 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 '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 jewels | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 5–7 days in borders | Pet-safe |
| 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 |
| Cape Mallow | Direct sun (at least 4-6 hours) | Water when the top 2–3 cm of soil is dry | Mildly 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 |
| Carding Mill Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week through the growing season, more in heat | Pet-safe |
| 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 |
| 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 |
| Cascade Purple Aubrieta | Direct sun (at least 4-6 hours) | Weekly during active growth; minimal in summer dormancy | Pet-safe |
| Cascade White Trailing Lobelia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost is dry, roughly every 2-4 days (more frequent in hot weather) | Toxic to pets |
| Cascadia trailing petunia | Direct sun (at least 4-6 hours) | Every 2-3 days in warm weather; check daily in summer heat | Pet-safe |
| 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'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 speciosa | Direct sun (at least 4-6 hours) | Weekly when young; notably drought-tolerant once established | Mildly toxic to pets |
| Catasetum Orchid | Bright indirect light (just back from a sunny window) | Heavy in summer growth; none during winter dormancy | Mildly toxic to pets |
| Catawba Rhododendron 'Roseum Elegans' | Bright indirect light (just back from a sunny window) | About weekly, deeper in heat and drought; water when the top 3-5 cm of soil is dry | Toxic to pets |
| Catesby's Pitcher Plant | Direct sun (at least 4-6 hours) | Tray method with seasonal reduction | Pet-safe |
| Catmint 'Walker's Low' | 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 |
| Caucasian Comfrey | Medium indirect light (a couple of metres from a window) | Every 5–7 days during dry spells; self-sufficient in rainy climates | Mildly toxic to pets |
| Caucasian Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Cavendish Banana | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water when the top 2-3 cm dries, often every 2-4 days in active growth | Pet-safe |
| Ceanothus '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 |
| 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 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 |
| Celosia argentea var. spicata 'Cramer's Amazon' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days once established | Pet-safe |
| Ceratophyllum demersum | Medium indirect light (a couple of metres from a window) | Permanently submerged; 25-40% water change weekly | Mildly toxic to pets |
| Ceratopteris cornuta | Medium indirect light (a couple of metres from a window) | Permanently submerged/floating; 25-40% water change weekly | Mildly toxic to pets |
| Ceratopteris thalictroides | Medium indirect light (a couple of metres from a window) | Permanently submerged; 25-40% water change weekly | 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 |
| Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce in winter | Toxic to pets |
| Chandelier Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer | Toxic to pets |
| Cheiridopsis denticulata | Direct sun (at least 4-6 hours) | Autumn through spring; keep dry through summer dormancy | Mildly toxic to pets |
| Cheiridopsis robusta | Direct sun (at least 4-6 hours) | During autumn-spring growth when soil is bone dry; withhold through summer | Mildly toxic to pets |
| 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 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 |
| 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 |
| 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 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 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 Juniper 'Itoigawa' | Direct sun (at least 4-6 hours) | When the soil surface is approaching dry, then water thoroughly | Mildly toxic to pets |
| Chinese Lantern Plant | Direct sun (at least 4-6 hours) | Weekly during growing season; drought-tolerant once established | Toxic to pets |
| Chinese 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 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 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 |
| Chive-Leaved Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Mildly toxic to pets |
| 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 |
| Chrysanthemum 'Hillside Pink Sheffield' | Direct sun (at least 4-6 hours) | Every 5-7 days when the top 2-3 cm of soil is dry | Toxic to pets |
| Cilician Colchicum | Direct sun (at least 4-6 hours) | Rely on natural rainfall during growth; keep dry in summer dormancy (June–August) | Toxic to pets |
| Cilician Meadow Saffron | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry between waterings, roughly every 14-21 days in active growth | Toxic to pets |
| Cinco de Mayo Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week through the growing season, more in heat | 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 |
| Clamshell Orchid | Medium indirect light (a couple of metres from a window) | Every 5–7 days; allow the mix to almost dry before rewetting | Pet-safe |
| 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 |
| Cleistocactus Hyalacanthus | Direct sun (at least 4-6 hours) | When the mix is fully dry, about every 7-10 days in summer; keep dry in winter | Pet-safe |
| 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 '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 '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 '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 'Polish Spirit' | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week through the growing season | 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 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 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 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 |
| 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 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 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 |
| 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 |
| Clustered bellflower | Direct sun (at least 4-6 hours) | Weekly during dry spells; moderate water needs | Pet-safe |
| Cobaea scandens | Direct sun (at least 4-6 hours) | Keep evenly moist through the growing season; water containers regularly | Mildly toxic to pets |
| 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 |
| Coelogyne cristata | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; sparingly during the winter rest | Pet-safe |
| Coelogyne flaccida | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; reduced over winter | Pet-safe |
| Coelogyne pandurata | Bright indirect light (just back from a sunny window) | Water freely in active growth, about every 3-5 days, easing to a lighter winter regime | Mildly toxic to pets |
| Coleus | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring/summer; every 7–10 days in winter | 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 'Coffee Cups' | Direct sun (at least 4-6 hours) | Keep constantly wet; never let it dry out | 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 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 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 |
| Coloratus Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Columbine 'McKana Giant' | Bright indirect light (just back from a sunny window) | Once or twice a week in dry weather; keep soil evenly moist during flowering | 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 |
| 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 dogwood | Bright indirect light (just back from a sunny window) | Weekly in first season; largely self-sufficient once established | Mildly toxic to pets |
| Common Foxtail Cactus | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 10-21 days in summer; very sparingly in winter | Pet-safe |
| Common Grape Hyacinth | Direct sun (at least 4-6 hours) | Rainfall typically sufficient; water lightly once per week only in very dry springs | 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 Lime | Direct sun (at least 4-6 hours) | Regular in first 2–3 years; occasional once established | Pet-safe |
| Common Milkweed | Direct sun (at least 4-6 hours) | Moderate; weekly when establishing, drought-tolerant once established | Toxic to pets |
| Common Poppy | Direct sun (at least 4-6 hours) | Low once established; water seedlings until 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 Water Hyacinth | Direct sun (at least 4-6 hours) | Free-floating aquatic — roots permanently submerged in open water | Pet-safe |
| Common Water Hyacinth | Direct sun (at least 4-6 hours) | Aquatic — free-floating on the water surface permanently | Pet-safe |
| 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 |
| 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 |
| 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 |
| Copper Angel Masdevallia | Medium indirect light (a couple of metres from a window) | 2–3 times per week; keep substrate slightly moist | Pet-safe |
| Coral Bells 'Caramel' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil feels dry, roughly every 5-7 days during active growth | Pet-safe |
| Coral Cattleya | Bright indirect light (just back from a sunny window) | When the mix dries, roughly every 5-7 days in growth | 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 |
| Coreopsis 'Uptick Gold and Bronze' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| 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 |
| Cornelia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in heat | Pet-safe |
| Cornflower | Direct sun (at least 4-6 hours) | Low to moderate — water during establishment only | Pet-safe |
| Cornish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once settled | Pet-safe |
| Cosmos bipinnatus 'Sensation White' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cosson's Germander | Direct sun (at least 4-6 hours) | Sparingly every 2–3 weeks in summer; minimal to none in winter | Mildly toxic to pets |
| Costa 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 |
| Cotinus coggygria 'Grace' | Direct sun (at least 4-6 hours) | Weekly while establishing; rarely thereafter once rooted | 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 |
| Cowslip | Medium indirect light (a couple of metres from a window) | Twice weekly in active growth, reduce to once weekly when dormant in summer | Toxic to pets |
| Crane's Bill Stork's Bill | Direct sun (at least 4-6 hours) | Water lightly; allow the soil surface to dry between waterings | Mildly toxic to pets |
| Crassula Tetragona | Direct sun (at least 4-6 hours) | When soil is dry, about every 7-12 days in summer; sparingly in winter | Toxic to pets |
| Crazy-leaf Begonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; every 10–14 days in winter | Toxic to pets |
| Creeping fig | Bright indirect light (just back from a sunny window) | When the top 1cm (half-inch) of compost dries | Toxic to pets |
| Creeping Sage | Bright indirect light (just back from a sunny window) | Weekly during the growing season | Pet-safe |
| Crested Bracken | Medium indirect light (a couple of metres from a window) | every 1-2 weeks once established | Toxic to pets |
| Crested Floating Heart | Direct sun (at least 4-6 hours) | Permanently aquatic; maintain 10–60 cm water depth | Mildly toxic to pets |
| Crested Iris | Medium indirect light (a couple of metres from a window) | Moderate — keep evenly moist | 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 |
| 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 |
| Crocosmia × crocosmiiflora 'Solfatare' | Direct sun (at least 4-6 hours) | Weekly during growth and flowering in dry spells; reduce as foliage dies back | Mildly toxic to pets |
| Crocus 'Pickwick' | Direct sun (at least 4-6 hours) | Depend on rainfall; supplemental water only during a dry spell right after autumn planting or active spring growth | Mildly toxic to pets |
| Crocus tommasinianus 'Ruby Giant' | Direct sun (at least 4-6 hours) | Rainfall-reliant; water only briefly during a dry autumn establishment or droughty early spring | Mildly toxic to pets |
| Crossvine | Bright indirect light (just back from a sunny window) | Weekly when young; established plants are drought-tolerant | Mildly toxic to pets |
| Cryptocoryne spiralis | Medium indirect light (a couple of metres from a window) | Continuously submerged; 25-50% water change weekly | Mildly toxic to pets |
| Ctenanthe Oppenheimiana 'Tricolor' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Cuban 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 Royal Palm | Direct sun (at least 4-6 hours) | Every 5–7 days when young; established trees weekly or rely on rainfall | Pet-safe |
| Cunninghamia 'Glauca' | Direct sun (at least 4-6 hours) | Keep soil moist; water regularly while young, then deeply in dry spells once established | Mildly toxic to pets |
| Cup 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 |
| Cupid Peperomia | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in spring and summer, less in winter — always led by the soil, not the calendar. | Pet-safe |
| Curio Radicans | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, about every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Talinoides var. mandraliscae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| 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 |
| Cushion Aloe Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 7-12 days in summer, much less in winter | Pet-safe |
| Custard Biriba | Direct sun (at least 4-6 hours) | 2–3 times per week in growing season; reduce in cooler months | 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 |
| Cymbidium 'Red Beauty' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in winter | Pet-safe |
| Cymbidium 'Showgirl' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in winter | Pet-safe |
| Cymbidium tracyanum | Bright indirect light (just back from a sunny window) | Every 3-6 days in growth; keep evenly moist in summer | Pet-safe |
| 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 longus | Direct sun (at least 4-6 hours) | Keep the soil wet to saturated; grow in shallow water up to about 5-15 cm or in permanently boggy ground | Mildly toxic to pets |
| Cyperus-Like Sedge | Medium indirect light (a couple of metres from a window) | Permanent moisture; plant in standing water up to 15 cm deep | Pet-safe |
| Dagger-Leaf Rush | Bright indirect light (just back from a sunny window) | Frequent to constant — soil must remain moist to wet at all times | Pet-safe |
| Dahlia 'Breakout' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week, more in heat | 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 |
| Dainty Bess Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Darcy's Sage | Direct sun (at least 4-6 hours) | Regular to moderate — allow soil surface to dry between waterings | Mildly toxic to pets |
| Darley Dale heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Darley Dale Heath Furzey | Direct sun (at least 4-6 hours) | Water weekly in dry spells; reduce in winter unless the soil is very dry | Pet-safe |
| Darwin's barberry | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; drought-tolerant once established | Mildly toxic to pets |
| 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 | Direct sun (at least 4-6 hours) | Weekly; keep moist in the first season | Toxic to pets |
| Daylily 'Chicago Apache' | Direct sun (at least 4-6 hours) | Roughly every 7-10 days during the growing season; reduce to every 2-3 weeks in winter dormancy | Toxic to pets |
| Daylily 'Crimson Pirate' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; every 2-3 weeks in dormancy | Toxic to pets |
| Daylily 'Frans Hals' | 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 | Toxic to pets |
| Daylily 'Hyperion' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; every 2-3 weeks in dormancy | Toxic to pets |
| Daylily 'Mary Todd' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Daylily 'Orange Velvet' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Daylily 'Pan for Gold' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Daylily 'Prairie Blue Eyes' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Daylily 'Primal Scream' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7 days in summer | Toxic to pets |
| Daylily 'Red Hot Returns' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Daylily 'Stafford' | Direct sun (at least 4-6 hours) | Every 7-10 days, or when the top 5 cm of soil is dry | Toxic to pets |
| Debao Cycad | Bright indirect light (just back from a sunny window) | Every 7–14 days; reduce in winter | 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 |
| Derby Sundew | Bright indirect light (just back from a sunny window) | Standing tray method (growing season); reduced to near-dry (rest) | Pet-safe |
| Deshojo Japanese Maple | Bright indirect light (just back from a sunny window) | Keep consistently moist; frequently daily in summer | Mildly toxic to pets |
| 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 |
| 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 |
| Diaguita Air Plant | Direct sun (at least 4-6 hours) | Mist or dunk thoroughly 2–3 times per week in summer; every 7–10 days in winter. | Pet-safe |
| Diana Clare Pulmonaria | Low light (north window or shaded room) | Keep soil evenly moist; water every 4-6 days in dry spells, more in pots | Mildly toxic to pets |
| 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 |
| Diascia 'Wink Coral Pink' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| 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 |
| Digitalis 'Camelot Cream' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly weekly in dry spells | Toxic to pets |
| Dimpled Trout Lily | Medium indirect light (a couple of metres from a window) | Consistently moist from emergence to dormancy (late winter to late spring) | Mildly toxic to pets |
| Dionaea muscipula 'B52' | Direct sun (at least 4-6 hours) | Keep permanently wet; stand in 1-2 cm of pure water in the growing season | Pet-safe |
| Dionaea muscipula 'Dentate Traps' | Direct sun (at least 4-6 hours) | Keep constantly moist; tray-water with pure water | Pet-safe |
| 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 |
| Disa tripetaloides | Bright indirect light (just back from a sunny window) | Keep permanently moist; water daily or stand in a tray of pure water | Pet-safe |
| Divine Orange New Guinea Impatiens | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather; containers in full sun may need daily watering in peak summer | Mildly toxic to pets |
| 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 |
| Double Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (keep soil consistently moist) | Toxic to pets |
| 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 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 |
| Dragon Heart Cranesbill | Bright indirect light (just back from a sunny window) | Moderate; water during dry spells | Mildly 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 |
| Drooping Star of Bethlehem | Bright indirect light (just back from a sunny window) | Low; rainfall usually sufficient in temperate gardens | Toxic to pets |
| Drosera binata 'Multifida Extrema' | Direct sun (at least 4-6 hours) | Keep media constantly wet; stand in 1-2 cm of water via the tray method in growth, drier in winter | Mildly toxic to pets |
| Drosera burmanni | Direct sun (at least 4-6 hours) | Keep media constantly wet; stand in 1-2 cm of pure water at all times in growth | Pet-safe |
| Drosera capensis 'Alba' | Bright indirect light (just back from a sunny window) | Keep constantly wet, standing the pot in 1-2 cm of water (tray method) at all times | Pet-safe |
| Druce's Cranesbill | Bright indirect light (just back from a sunny window) | Water during establishment; once established largely drought-tolerant | Pet-safe |
| Drymonia serrulata | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| 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 |
| 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 Black Spruce | Direct sun (at least 4-6 hours) | Weekly in summer, every 2–3 weeks in winter | Mildly toxic to pets |
| 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 Golden Oriental Arborvitae | Direct sun (at least 4-6 hours) | Moderate — weekly when young, reduced once established | Toxic to pets |
| Dwarf Greenstripe Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer, once per week in winter | Pet-safe |
| 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 Sage | Bright indirect light (just back from a sunny window) | Weekly in summer, less in winter | Pet-safe |
| Eastern Cape Blue Cycad | Direct sun (at least 4-6 hours) | Every 3–6 weeks in summer; once a month or less in winter | Toxic to pets |
| Echeveria 'Blue Atoll' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Cubic Frost' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Dondo' | Direct sun (at least 4-6 hours) | When the soil is fully dry, around every 10-14 days in summer, sparingly in winter | Pet-safe |
| Echeveria pallida | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and much less in winter | Pet-safe |
| Echinacea 'PowWow Wild Berry' | 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 |
| Echinodorus cordifolius | Medium indirect light (a couple of metres from a window) | Submerged to emersed; 25-30% weekly water change | Mildly toxic to pets |
| Echinodorus grisebachii 'Bleherae' | Medium indirect light (a couple of metres from a window) | Permanently submerged; 25-30% weekly water change | Mildly toxic to pets |
| Echinodorus tenellus | Bright indirect light (just back from a sunny window) | Permanently submerged; 25-30% weekly water change | Mildly toxic to pets |
| 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 |
| Echinopsis huascha | Direct sun (at least 4-6 hours) | Soak-and-dry; roughly every 10-14 days in active growth, none in winter | Pet-safe |
| Ecuador Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (consistent moisture essential) | Toxic to pets |
| Egyptian Star Flower | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry | Mildly toxic to pets |
| Elegant clarkia | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Pet-safe |
| Elephant Ears 'Bressingham White' | Medium indirect light (a couple of metres from a window) | Every 7-14 days; established plants are relatively drought-tolerant but perform best with consistent moisture | Mildly toxic to pets |
| Elina Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Elizabeth Magnolia | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2 weeks in dry periods once mature | Mildly toxic to pets |
| Elm-Leaf Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; reduce to every 14 days in winter | Toxic to pets |
| Elongated Sun Pitcher | Bright indirect light (just back from a sunny window) | Soil kept consistently moist to wet year-round; shallow tray method acceptable | Mildly toxic to pets |
| Emerald Blue Creeping Phlox | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; drought-tolerant once established (second year onward) | Pet-safe |
| Emerald Queen Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days in spring and summer | Pet-safe |
| Emperor Sago | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days | Toxic to pets |
| Encephalartos 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 |
| 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 |
| Entire-Lipped Catasetum | Bright indirect light (just back from a sunny window) | Abundantly during active growth (spring–autumn); near-dry during winter dormancy | Pet-safe |
| Epidendrum ibaguense | Direct sun (at least 4-6 hours) | When the top of the medium feels nearly dry, roughly every 4-6 days in growth | Pet-safe |
| Epidendrum secundum | Direct sun (at least 4-6 hours) | Water about weekly, keeping the medium lightly moist; let the surface dry between waterings | Pet-safe |
| Epipremnum amplissimum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Aureum 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 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 |
| Equisetum japonicum | Direct sun (at least 4-6 hours) | Keep permanently wet or in shallow standing water | 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 |
| Erythronium 'Pagoda' | Bright indirect light (just back from a sunny window) | Keep soil cool and evenly moist in spring; never let bulbs dry out completely | Mildly toxic to pets |
| 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 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 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 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 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 |
| Excellent Pitcher Plant | Direct sun (at least 4-6 hours) | Keep in a standing tray of 2–5 cm (1–2 in) of pure water at all times during the growing season; reduce in winter dormancy | Pet-safe |
| 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 |
| Fallopia baldschuanica | Direct sun (at least 4-6 hours) | Water deeply during the first two growing seasons; established plants rarely need irrigation | Mildly toxic to pets |
| False Indigo Bush | Direct sun (at least 4-6 hours) | Regular watering (every 5–7 days) during establishment; drought-tolerant once established, or tolerates periodic inundation in wet sites | Mildly toxic to pets |
| 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 |
| Farewell-to-spring | Direct sun (at least 4-6 hours) | Every 7–10 days; reduce once established | Pet-safe |
| 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 |
| 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 |
| Ferocactus schwarzii | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Fetcani Pass Twinspur | Bright indirect light (just back from a sunny window) | Water when top 2–3 cm of soil dries out | Mildly 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 pumila 'Minima' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Ficus pumila 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Ficus Retusa Bonsai | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil feels dry, often every 2-4 days in growth | Toxic to pets |
| 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 |
| Field poppy | Direct sun (at least 4-6 hours) | Once established, every 10–14 days; keep seedbed moist until germination | Mildly toxic to pets |
| Fire Alarm Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about weekly | Pet-safe |
| Fire and Ice Hosta | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Fire Star Orchid | Direct sun (at least 4-6 hours) | When the top 2-3 cm of the mix is dry, roughly every 5-7 days | Pet-safe |
| Firebush | Direct sun (at least 4-6 hours) | Weekly until established; every 10–14 days once mature | 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 Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days; allow top 2–3 cm to dry between waterings | Toxic to pets |
| 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 |
| 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 |
| Flat Sea Holly | Direct sun (at least 4-6 hours) | Low — water occasionally during the first growing season, then minimal | Pet-safe |
| Flat-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring and summer; reduce to every 14-21 days in winter | Pet-safe |
| Flexuose Nerine | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days during active growth | Toxic to pets |
| Flexuous Dancing Lady | Bright indirect light (just back from a sunny window) | When the top of the bark mix is dry, approximately every 7 days in summer and every 10-14 days in winter | Pet-safe |
| Flexuous Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter rest | Pet-safe |
| 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 |
| 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 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 |
| 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 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 |
| Fork-leaved Sundew | Direct sun (at least 4-6 hours) | Keep permanently wet; stand the pot in 1-3 cm of water at all times | Mildly toxic to pets |
| Forked Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; reduce to every 14–21 days in winter | Toxic to pets |
| Formosa Lily | Direct sun (at least 4-6 hours) | 2-3 times per week in active growth | 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 |
| 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 |
| 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 |
| Foxtail Palm | Direct sun (at least 4-6 hours) | When the top few cm of soil dries; regularly in growth | Mildly toxic to pets |
| Fragrans Maidenhair Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist at all times, often every 2-4 days | Pet-safe |
| Fragrant Bouquet Hosta | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply 1-2 times weekly, more in heat | Toxic to pets |
| Fragrant Hosta 'Guacamole' | 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 sun and heat | Toxic to pets |
| Fragrant Maidenhair Fern | Bright indirect light (just back from a sunny window) | When the surface just begins to dry, roughly every 3-5 days | Pet-safe |
| Francee 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 |
| Fred Ives | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in winter | Pet-safe |
| Fritsch's Goldfish Plant | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry | Pet-safe |
| Frohnleiten Epimedium | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 1-2 weeks | Mildly toxic to pets |
| Frosty Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the surface just begins to dry, often 2-3 times per week | Pet-safe |
| 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 'Annabel' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost are dry, roughly every 5-7 days in summer | Pet-safe |
| Fuchsia 'Beacon' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost are dry, roughly every 7-10 days in summer | Pet-safe |
| Fuchsia 'Brutus' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost are dry, roughly every 7-10 days | Pet-safe |
| Fuchsia 'Celia Smedley' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost is dry, roughly every 3-5 days in summer | Mildly toxic to pets |
| Fuchsia 'Marinka' | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost are dry, roughly every 5-7 days; daily checks in hot 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 'Phyllis' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost feels dry, roughly every 4-6 days in summer | Mildly toxic to pets |
| Fuchsia 'Pink Marshmallow' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost feel dry, roughly every 5-7 days; more frequently in summer heat | Pet-safe |
| Fuchsia 'Voodoo' | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost are dry, roughly every 5-7 days in summer | Pet-safe |
| Fuchsia 'Winston Churchill' | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost are dry, roughly every 6-8 days | Pet-safe |
| Garden verbena | Direct sun (at least 4-6 hours) | Every 3–5 days during active growth; reduce in cooler weather | 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 |
| Georgia Blue Speedwell | Direct sun (at least 4-6 hours) | Moderate; water when the top 2–3 cm of soil dries out | Pet-safe |
| Geranium 'Ann Folkard' | Direct sun (at least 4-6 hours) | Weekly while establishing and in dry spells; little once mature. | Mildly toxic to pets |
| Geranium 'Nimbus' | Direct sun (at least 4-6 hours) | Weekly while establishing and during dry spells; drought-tolerant when mature | Mildly toxic to pets |
| Geranium 'Orion' | Direct sun (at least 4-6 hours) | Weekly while establishing and in dry spells; drought-tolerant once mature | Mildly toxic to pets |
| Geranium 'Patricia' | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm dries, roughly weekly in growing season; established clumps tolerate some dryness | Mildly toxic to pets |
| Geranium × oxonianum 'Wargrave Pink' | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry; roughly weekly, more in heat | Mildly toxic to pets |
| Geranium clarkei 'Kashmir Purple' | Direct sun (at least 4-6 hours) | Weekly while establishing and in droughts; drought-tolerant once settled | Mildly toxic to pets |
| Geranium clarkei 'Kashmir White' | Direct sun (at least 4-6 hours) | Weekly while establishing and in droughts; drought-tolerant once settled | Mildly toxic to pets |
| Geranium endressii | Bright indirect light (just back from a sunny window) | Water through establishment; afterwards in dry spells only | Mildly toxic to pets |
| Geranium macrorrhizum 'Bevan's Variety' | Medium indirect light (a couple of metres from a window) | When the top 4-5 cm of soil is dry; weekly to establish, seldom afterwards | Mildly toxic to pets |
| Geranium phaeum 'Lily Lovell' | Medium indirect light (a couple of metres from a window) | Water when top 3-5 cm of soil is dry; keep evenly moist while establishing | Mildly toxic to pets |
| Geranium pratense | Direct sun (at least 4-6 hours) | Roughly weekly in the first season and during prolonged dry spells; established plants need little. | Mildly toxic to pets |
| Geranium psilostemon | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; about weekly, more in heat | Mildly toxic to pets |
| Geranium wallichianum 'Syabru' | Bright indirect light (just back from a sunny window) | Water during establishment, then keep evenly moist through the growing season | Mildly toxic to pets |
| Geranium x magnificum | Direct sun (at least 4-6 hours) | Weekly in the first season and during drought; established plants are fairly drought-tolerant | Mildly toxic to pets |
| Geranium x oxonianum | Bright indirect light (just back from a sunny window) | Water through the first season; thereafter only during sustained dry spells | Mildly toxic to pets |
| Geranium x oxonianum 'Claridge Druce' | Bright indirect light (just back from a sunny window) | Water during the first season; afterwards only in extended drought | Mildly toxic to pets |
| Geranium x oxonianum 'Wargrave Pink' | Bright indirect light (just back from a sunny window) | Water during establishment; afterwards only in extended drought | Mildly toxic to pets |
| German Empress Orchid Cactus | 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 |
| 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 |
| Ghost Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil starts to dry, often every 4-7 days | Mildly toxic to pets |
| Giant Bamboo | Direct sun (at least 4-6 hours) | Frequently; requires abundant moisture year-round | 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 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 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 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 Grass | Direct sun (at least 4-6 hours) | Water to establish the first season, then occasionally in drought, roughly every 2-3 weeks | Mildly toxic to pets |
| Giant Sequoia | Direct sun (at least 4-6 hours) | Weekly while establishing; deep occasional soaks once mature | Mildly toxic to pets |
| Giant Sequoia 'Glaucum' | Direct sun (at least 4-6 hours) | Deeply once or twice a week while establishing; then during dry spells | Mildly toxic to pets |
| Giant Sunburst Lotus | Direct sun (at least 4-6 hours) | Aquatic — continuously in still or gently moving water | Mildly toxic to pets |
| Giant Thevetia | Direct sun (at least 4-6 hours) | Every 7–14 days once established; water deeply during the growing season | Toxic to pets |
| Giant Thorny Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during the growing season; reduce in the dry season | Pet-safe |
| Giant Timber Bamboo | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week; more frequently in hot weather or during shooting season | Pet-safe |
| Giant 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 |
| Ginseng Ficus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 4-7 days in the small bonsai pot | Toxic to pets |
| Gladiolus 'Espresso' | Direct sun (at least 4-6 hours) | Keep evenly moist during growth, roughly 25 mm per week and more during spike formation | Toxic to pets |
| Gladiolus 'Purple Flora' | Direct sun (at least 4-6 hours) | Keep evenly moist in growth, about 25 mm per week, more in heat and as spikes form | Toxic to pets |
| Glaziou's Fuchsia | Bright indirect light (just back from a sunny window) | Water freely in growth; reduce in winter | Pet-safe |
| Gleditsia triacanthos 'Sunburst' | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are notably drought-tolerant | Pet-safe |
| Gleditsia triacanthos f. inermis | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are highly drought-tolerant | Pet-safe |
| 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 |
| Goeppertia 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 |
| 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 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 Creeping Jenny | Bright indirect light (just back from a sunny window) | Every 3–7 days; keep consistently moist; will tolerate standing water as a pond marginal | 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 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 Sedum | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Golden Torch Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about weekly to fortnightly in summer; keep dry in winter | Pet-safe |
| Golden 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-Leaved Jerusalem Sage | Direct sun (at least 4-6 hours) | Low — water every 2–3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| 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 |
| Goldmoss Stonecrop | Direct sun (at least 4-6 hours) | Rarely — established plants rely on rainfall; water only in prolonged drought | Mildly toxic to pets |
| Gooseneck Loosestrife | Medium indirect light (a couple of metres from a window) | Regularly; moist soil preferred | Mildly toxic to pets |
| Graceful Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in summer; every 4–5 days in winter | Pet-safe |
| 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 |
| 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 Anemone 'Robustissima' | Bright indirect light (just back from a sunny window) | When the top 4-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Grape-leaved passionflower | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth | Mildly toxic to pets |
| Grape-Vine Begonia | Bright indirect light (just back from a sunny window) | Every 6–9 days in growing season; every 10–14 days in winter | Toxic to pets |
| Grapeleaf Abutilon | Direct sun (at least 4-6 hours) | Moderate; established plants are fairly drought-tolerant | Mildly toxic to pets |
| Graptosedum 'Francesco Baldi' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Graptosedum 'Vera Higgins' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Graptoveria 'Acaulis' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 1-2 weeks in growth | Pet-safe |
| Graptoveria 'Debbie' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, minimal in winter | Mildly toxic to pets |
| Graptoveria 'Fred Ives' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Gray Birch | Direct sun (at least 4-6 hours) | Moderate; tolerates drier conditions than most birches once established | Pet-safe |
| Greater Duckweed | Direct sun (at least 4-6 hours) | Permanently floating on water surface | Pet-safe |
| Greater Fringed Gentian | Bright indirect light (just back from a sunny window) | Regular — consistently moist | Pet-safe |
| Greater Periwinkle | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; every 10–14 days once established | Toxic to pets |
| Greater Spearwort | Direct sun (at least 4-6 hours) | Shallow to moderate water depth: 10–45 cm | Toxic to pets |
| Greater Stitchwort | Medium indirect light (a couple of metres from a window) | Moderate; keep soil evenly moist during spring and summer | Mildly toxic to pets |
| Greater Woodrush | Low light (north window or shaded room) | Weekly in first season, then largely self-sufficient | Pet-safe |
| Green Ash | Direct sun (at least 4-6 hours) | Weekly when establishing; drought-tolerant once mature | Pet-safe |
| Green Cabomba | Bright indirect light (just back from a sunny window) | Fully submerged aquatic; maintain in aquarium water continuously | 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 Rotala | Bright indirect light (just back from a sunny window) | Fully submerged; 20-30% water change weekly | Mildly toxic to pets |
| Green Sheen Japanese Spurge | Low light (north window or shaded room) | Weekly during the first two growing seasons; once established, water during prolonged dry spells only | Mildly toxic to pets |
| Gryphon Begonia | Bright indirect light (just back from a sunny window) | When the top 2–3 cm (about 1 inch) of soil dries out | 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 |
| 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 |
| 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 |
| 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 |
| Hammock Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season, every 10–14 days in winter | Pet-safe |
| Happy Wanderer | Bright indirect light (just back from a sunny window) | Low to moderate; drought tolerant once established | Mildly toxic to pets |
| Hard Fern | Medium indirect light (a couple of metres from a window) | 2-3 times per week in growing season; reduce slightly in winter | 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 |
| Haworth's Lampranthus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; sparingly in summer dormancy | Mildly toxic to pets |
| Haworthia Turgida | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 7-12 days in summer, sparse in winter | Pet-safe |
| Hay-Scented Fern | Medium indirect light (a couple of metres from a window) | Keep evenly moist while establishing; water when the top 2-3 cm of soil is dry, roughly weekly | Mildly toxic to pets |
| Heart-Lipped Brassavola | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; reduce to every 7–10 days in cooler months | Pet-safe |
| Heath Speedwell | Bright indirect light (just back from a sunny window) | Low to moderate — allow soil to partially dry between waterings | Pet-safe |
| Heavenly blue morning glory | Direct sun (at least 4-6 hours) | Once or twice a week in dry periods; reduce once established | Toxic to pets |
| 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 '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 bindweed | Direct sun (at least 4-6 hours) | Tolerates drought once established; water young plants weekly until roots are established | Mildly toxic to pets |
| Heldreich's Sage | Direct sun (at least 4-6 hours) | Occasional; drought-tolerant once established | Pet-safe |
| 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 'Rotgold' | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil is dry, roughly every 4-7 days in summer | Mildly toxic to pets |
| Helenium 'Sahin's Early Flowerer' | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 4-7 days, more in heat | Toxic to pets |
| 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 |
| Helleborus orientalis 'Ivory Prince' | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry; weekly while establishing, then during dry spells | Toxic to pets |
| Hemianthus micranthemoides | Bright indirect light (just back from a sunny window) | Permanently submerged; 30-50% water change weekly | Mildly toxic to pets |
| Hemigraphis alternata | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 3-5 days in warm growth | Pet-safe |
| Hemisphere Torch Ginger | Bright indirect light (just back from a sunny window) | 2–3 times per week | Mildly 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 |
| 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 |
| Hernandez-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in autumn and winter | Pet-safe |
| Heuchera 'Berry Smoothie' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days during active growth | Mildly toxic to pets |
| Heuchera 'Carnival Rose Granita' | 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 |
| Heuchera 'Georgia Peach' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days during active growth | Mildly toxic to pets |
| Heuchera 'Rave On' | 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 the growing season | Pet-safe |
| Heuchera villosa 'Autumn Bride' | 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 | Pet-safe |
| Heucherella Sweet Tea | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water deeply once or twice a week in dry weather | Pet-safe |
| Hibiscus syriacus 'Minerva' | Direct sun (at least 4-6 hours) | Water weekly during establishment and summer drought; moderately drought-tolerant once established | Pet-safe |
| Holger's Juniper | Direct sun (at least 4-6 hours) | Low — water deeply but infrequently once established | Mildly toxic to pets |
| 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 |
| Hooker's Inula | Bright indirect light (just back from a sunny window) | 2 times per week; tolerates periodic damp conditions | Pet-safe |
| Hope 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 |
| Horseshoe Vetch | Direct sun (at least 4-6 hours) | Rarely — established plants are very drought-tolerant | Mildly toxic to pets |
| Horst's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Hosta 'Fortunei Aureomarginata' | 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 'Golden Tiara' | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Hosta 'Lancifolia' | 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 summer | Toxic to pets |
| Hosta 'Patriot' | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Hosta 'Patriot' | 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 through the growing season | Toxic to pets |
| Hosta 'Pineapple Upside Down Cake' | 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 | Toxic to pets |
| Hosta 'Royal Standard' | 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 | Toxic to pets |
| Hosta 'Shade Fanfare' | 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 | Toxic to pets |
| Hosta 'Stained Glass' | 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 'Ventricosa' | 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 | Toxic to pets |
| Houttuynia cordata | Direct sun (at least 4-6 hours) | Keep soil constantly wet to waterlogged; never let it dry out | Mildly toxic to pets |
| Houttuynia cordata 'Chameleon' | Direct sun (at least 4-6 hours) | Keep soil constantly wet to waterlogged; never allow it to dry | Mildly toxic to pets |
| Hoya '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 '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 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 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 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 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 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 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 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 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 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 heuschkeliana | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in summer; every 2-3 weeks in winter | Pet-safe |
| Hoya 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 lacunosa | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in spring/summer; much less in autumn/winter | 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 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 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 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 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 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 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 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 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 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 Surigaoensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days | 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 |
| Huernia keniensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Huernia schneideriana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Mildly toxic to pets |
| 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 |
| 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 '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 '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 '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 |
| Hydrocharis morsus-ranae | Direct sun (at least 4-6 hours) | Free-floating; keep on the surface of still or slow water | Mildly toxic to pets |
| Hydrocotyle leucocephala | Medium indirect light (a couple of metres from a window) | Fully submerged or floating; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Hydrocotyle tripartita | Bright indirect light (just back from a sunny window) | Fully submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Hygrophila corymbosa | Medium indirect light (a couple of metres from a window) | Continuously submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Hygrophila difformis | Medium indirect light (a couple of metres from a window) | Continuously submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Hygrophila polysperma | Medium indirect light (a couple of metres from a window) | Continuously submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Hypoestes phyllostachya 'Carmina' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Confetti Pink' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Splash Select Pink' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Splash Select White' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Wit' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Iberian Cranesbill | Bright indirect light (just back from a sunny window) | Weekly in spring and summer; occasional in autumn | Pet-safe |
| Ice Cream Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil dries, every 2-4 days in warm growth | Pet-safe |
| Ice Cream Bean | Direct sun (at least 4-6 hours) | Deeply once or twice a week; reduce in cooler months | Mildly toxic to pets |
| Ice Dance Japanese Sedge | Low light (north window or shaded room) | Every 7-10 days or when the top 3-4 cm of soil is dry | Pet-safe |
| Ice Follies Daffodil | Direct sun (at least 4-6 hours) | Moderate during autumn–spring; dry in summer dormancy | Toxic to pets |
| Iceberg Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Illumination Periwinkle | Bright indirect light (just back from a sunny window) | Once or twice weekly; more frequently in containers or hot weather | Toxic to pets |
| Impatiens balsamina | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Impatiens hawkeri 'SunPatiens Compact Hot Coral' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in full sun during summer | Pet-safe |
| Impatiens hawkeri 'SunPatiens Spreading White' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in full sun and in baskets | Pet-safe |
| Inch Plant | Bright indirect light (just back from a sunny window) | Roughly weekly in summer; every 10-14 days in winter | Toxic to pets |
| Inch Plant 'Nanouk' | 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 |
| Indian Head Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days in spring and summer; every 3-4 weeks in autumn; minimal in winter | 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 |
| Ionas's Sun Pitcher | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; shallow tray of a few mm of water is acceptable | 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 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 |
| Iridescent Bamboo | Direct sun (at least 4-6 hours) | Twice weekly in spring and summer; weekly in autumn; fortnightly in winter | Pet-safe |
| Iris 'Black Gamecock' | Direct sun (at least 4-6 hours) | Keep consistently wet; tolerates standing water and never fully dry out | Toxic to pets |
| Iris 'Clarence' | Direct sun (at least 4-6 hours) | Keep moist through spring and late summer to support rebloom; do not waterlog | Toxic to pets |
| Iris laevigata 'Variegata' | Direct sun (at least 4-6 hours) | Permanently wet; thrives in 0-15 cm of standing water year-round | Toxic to pets |
| Iris pseudacorus | Direct sun (at least 4-6 hours) | Permanently wet; thrives in 0-30 cm of standing water | Toxic to pets |
| Iris pseudacorus 'Variegatus' | Direct sun (at least 4-6 hours) | Keep permanently wet; never let the rootzone dry out | 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 |
| Ivan Cranesbill | Medium indirect light (a couple of metres from a window) | Once or twice a week in dry spells; less in cooler or wetter periods | Pet-safe |
| Ivy-Leaved Cyclamen | Medium indirect light (a couple of metres from a window) | Drought-tolerant once established; rely entirely on natural rainfall | Toxic to pets |
| 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 |
| 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 |
| 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 Banana | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 4-6 days in active growth | Pet-safe |
| Japanese Beech Fern | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water when the top 2-3 cm begin to dry, roughly weekly during dry periods | 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 '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 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 Larch | Direct sun (at least 4-6 hours) | When the surface just begins to dry, often once or twice daily in summer | Mildly toxic to pets |
| Japanese Maple 'Bloodgood' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply in dry spells | Mildly toxic to pets |
| Japanese Maple '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 '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 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 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 Quince Bonsai | 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 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 |
| 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 |
| 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 |
| 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 |
| Jolly Bee Cranesbill | Bright indirect light (just back from a sunny window) | Regular; keep moderately moist | Mildly toxic to pets |
| Jordaaniella cuprea | Direct sun (at least 4-6 hours) | When the top few centimetres of soil are dry, about every 7-12 days in growth; reduce sharply in cold or dormancy | Mildly toxic to pets |
| Joseph's coat | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Mildly toxic to pets |
| Joseph's Coat Amaranth | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Jubilee Celebration Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Just Joey Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while in growth | Pet-safe |
| 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 |
| 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 |
| 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 |
| 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 |
| Kenneally's Sundew | Bright indirect light (just back from a sunny window) | Standing tray (growing season); minimal (dry rest) | Pet-safe |
| 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 |
| Kentucky wisteria | Direct sun (at least 4-6 hours) | Weekly during the first growing season; drought-tolerant once established | Toxic to pets |
| Keramanthus Adenia | Bright indirect light (just back from a sunny window) | Every 7–14 days during active growth; drastically reduced in dormancy | Toxic to pets |
| Kidney Vetch | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| Kiftsgate Rose | Direct sun (at least 4-6 hours) | Deep weekly soak while establishing; little needed once mature | Pet-safe |
| King Alfred Daffodil | Direct sun (at least 4-6 hours) | Moderate during growing season; dry during summer dormancy | Toxic to pets |
| King Henry Venus flytrap | Direct sun (at least 4-6 hours) | Continuously moist via tray method; barely damp in winter | Pet-safe |
| King of Hearts Brunnera | Low light (north window or shaded room) | Keep soil consistently moist; water when the top 2-3 cm dries, about every 5-7 days in warm weather | 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 |
| King Size Scarlet everlasting | Direct sun (at least 4-6 hours) | Every 7–10 days; water deeply then let soil partially dry | 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 |
| Knap Hill Scarlet quince | Bright indirect light (just back from a sunny window) | Weekly when establishing; monthly once established | Mildly toxic to pets |
| Kniphofia 'Alcazar' | Direct sun (at least 4-6 hours) | Weekly while establishing and during summer drought; minimal once mature | Pet-safe |
| Knock Out Rose | Direct sun (at least 4-6 hours) | About 2.5 cm of water weekly, deep soak | 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 |
| Koelreuteria paniculata | Direct sun (at least 4-6 hours) | Weekly for the first 1-2 years; minimal once established | Mildly toxic to pets |
| Kolkwitzia amabilis '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 |
| Kucyniak's Columnea | Bright indirect light (just back from a sunny window) | When top 2–3 cm of compost is dry | Pet-safe |
| Kunstler's Scaphochlamys | Low light (north window or shaded room) | Regularly; keep substrate consistently moist year-round | Mildly toxic to pets |
| 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 |
| 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 in Red Fern | Medium indirect light (a couple of metres from a window) | Keep consistently moist, roughly every 3-5 days for potted plants | Mildly toxic to pets |
| 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 |
| Lakeside Black Satin Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, roughly every 5-7 days during active growth | Toxic to pets |
| 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 |
| Large Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; every 14–21 days during the autumn-winter rest | Pet-safe |
| Large-Vein Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days during the growing season; every 3–4 weeks in winter | Pet-safe |
| 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 |
| 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 |
| Leatherleaf Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of mix is dry, roughly every 5-8 days | 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 |
| 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 |
| Leopoldina Earth Star | Bright indirect light (just back from a sunny window) | Water when top 2 cm of soil dries, roughly every 7-10 days | Pet-safe |
| Lesser Periwinkle | Medium indirect light (a couple of metres from a window) | Weekly during establishment; largely self-sufficient in average rainfall climates | Toxic to pets |
| Lesser Pond Sedge | Direct sun (at least 4-6 hours) | Permanently wet; waterlogged soil or up to 20 cm of standing water | Pet-safe |
| Lesser Spearwort | Direct sun (at least 4-6 hours) | Saturated mud to 5 cm standing water | Toxic to pets |
| Leucanthemum × superbum 'Snowcap' | Direct sun (at least 4-6 hours) | About once a week, when the top 3-4 cm of soil is dry | 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 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 |
| 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 lancifolium | Direct sun (at least 4-6 hours) | Keep evenly moist in active growth, roughly weekly; never waterlogged | Toxic to pets |
| Limnophila aquatica | Bright indirect light (just back from a sunny window) | Permanently submerged; keep tank topped up and perform 25-50% water changes weekly | Mildly toxic to pets |
| Limnophila sessiliflora | Bright indirect light (just back from a sunny window) | Grown submersed; do a 30-50% aquarium water change weekly | Mildly toxic to pets |
| Linaria maroccana 'Fairy Bouquet' | Direct sun (at least 4-6 hours) | When the top 2 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Lipstick Vine | Bright indirect light (just back from a sunny window) | When top 2–3 cm of compost feel dry | Pet-safe |
| Liquidambar styraciflua | 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 |
| Lobbi Japanese Cedar | Direct sun (at least 4-6 hours) | Weekly during establishment; fortnightly in dry spells once mature | Mildly toxic to pets |
| Lobelia erinus 'Techno Heat Blue' | Direct sun (at least 4-6 hours) | Keep consistently moist; check baskets daily in hot weather | Toxic to pets |
| Lobelia siphilitica | Direct sun (at least 4-6 hours) | Keep consistently moist; tolerates wet soil and short dry spells | Toxic to pets |
| 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 |
| Long-Flowered Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during the growing season; fortnightly in winter | 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 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 |
| Looking Glass Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season, less in winter | Toxic to pets |
| Love-lies-bleeding | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in summer | Mildly toxic to pets |
| Ludwigia brevipes | Bright indirect light (just back from a sunny window) | Grown submersed; do a 30-50% aquarium water change weekly | Mildly toxic to pets |
| Ludwigia palustris | Bright indirect light (just back from a sunny window) | Kept fully submersed or in saturated substrate; in aquaria do a 30-50% water change weekly | Mildly toxic to pets |
| Luxuriant Bleeding Heart | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Toxic to pets |
| Lyme Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Lysimachia nummularia | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water whenever the surface begins to dry | Mildly toxic to pets |
| Lythrum salicaria | Direct sun (at least 4-6 hours) | Keep wet; thrives in saturated soil and shallow water | Mildly 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 | 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 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 Periwinkle (Vinca) | Direct sun (at least 4-6 hours) | When the top 2-3 cm (1 in) of soil is dry, roughly weekly | Toxic to pets |
| Madagascar Sundew | Direct sun (at least 4-6 hours) | Continuously — maintain 1–3 cm of water in a tray year-round during active growth; reduce tray depth in winter. | Pet-safe |
| 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 |
| 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 |
| Magnificent Columnea | Bright indirect light (just back from a sunny window) | Every 4–7 days during active growth; every 10–14 days in winter | Pet-safe |
| 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 |
| 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 |
| 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 |
| Male Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Mildly toxic to pets |
| Malepartus silver grass | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in autumn; minimal in winter | Pet-safe |
| 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 |
| 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 |
| Manhattan Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Many-Flowered Air Plant | Bright indirect light (just back from a sunny window) | Mist 1–2 times per week, or a 20-minute soak every 1–2 weeks | Pet-safe |
| Many-Flowered Cornflag | Direct sun (at least 4-6 hours) | Weekly during autumn-to-spring growing season; dry in summer dormancy | Mildly toxic to pets |
| Many-Nippled Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 10-14 days in summer; once every 4-6 weeks 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 |
| Marmalade Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| 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 |
| Masdevallia Angel Frost | Medium indirect light (a couple of metres from a window) | Keep evenly moist year-round, watering about every 2-4 days so the medium never dries out | Pet-safe |
| Mato Grosso Milfoil | Direct sun (at least 4-6 hours) | Permanently submerged aquatic stem plant | Pet-safe |
| 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 |
| Maxillaria picta | Medium indirect light (a couple of metres from a window) | Water when the surface dries, about every 4-7 days; reduce somewhat after flowering | 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 |
| Maze-Leaf Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil feels dry | Toxic to pets |
| meadow fountain grass | Direct sun (at least 4-6 hours) | Weekly when new; every 2–3 weeks once established | 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 |
| 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 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 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 |
| Meyer's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer (August/September) through autumn; withheld completely from May to August | Pet-safe |
| Midas Touch Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Mikania ternata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days in growth | Mildly toxic to pets |
| Milkflower cotoneaster | Direct sun (at least 4-6 hours) | Weekly during the first growing season; drought-tolerant once established | Mildly toxic to pets |
| Million bells | Direct sun (at least 4-6 hours) | Daily in hot weather for containers; every 2–3 days in cooler periods | Mildly toxic to pets |
| Miltoniopsis 'Herralexandre' | Medium indirect light (a couple of metres from a window) | When the mix surface starts to dry, roughly every 4-6 days | Pet-safe |
| Miniature African violet | Bright indirect light (just back from a sunny window) | Every 5–8 days | Pet-safe |
| Minuteman Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, about every 5-7 days in the growing season | Toxic to pets |
| Mister Lincoln Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Mitchell's Pitcher Plant | Direct sun (at least 4-6 hours) | Tray method, seasonally adjusted | Pet-safe |
| Mock Orange | Direct sun (at least 4-6 hours) | Water in dry spells; drought-tolerant once established | Mildly toxic to pets |
| Moluccan Fishtail Palm | Direct sun (at least 4-6 hours) | Regularly; maintain consistent soil moisture | Mildly toxic to pets |
| 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 Plant Spurflower | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of compost feels dry, roughly every 5–8 days indoors | 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 |
| Monkeyflower | Bright indirect light (just back from a sunny window) | Constantly moist to wet — water daily in dry spells | Mildly toxic to pets |
| Monosolenium tenerum | Medium indirect light (a couple of metres from a window) | Permanently submerged; 25-40% water change weekly | Mildly 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 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 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 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 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 Siltepecana | Bright indirect light (just back from a sunny window) | Roughly every 5-7 days in summer; less in winter | 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-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 |
| Montbretia 'Lucifer' | Direct sun (at least 4-6 hours) | Approximately every 7-10 days during the growing season; reduce to monthly once dormant in autumn | Mildly toxic to pets |
| Monterey Cypress | Direct sun (at least 4-6 hours) | Weekly during establishment; infrequent once mature | Mildly toxic to pets |
| Moonflower | Direct sun (at least 4-6 hours) | Weekly, more often in hot or dry spells | 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 Coelogyne | 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 |
| Moroccan toadflax | Direct sun (at least 4-6 hours) | Once or twice a week; reduce to weekly once established | Mildly toxic to pets |
| Moses in the Cradle | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Moso Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in the growing season; weekly in winter | Pet-safe |
| Mossy Porroglossum | Medium indirect light (a couple of metres from a window) | Daily to every other day; never allow the medium to dry out | Pet-safe |
| Moudry Black Fountain Grass | Direct sun (at least 4-6 hours) | Weekly during establishment, then occasional deep watering in dry spells | Pet-safe |
| Mountain Soursop | Direct sun (at least 4-6 hours) | Twice weekly when establishing; weekly once mature | Mildly toxic to pets |
| Mrs D.F. Maxwell Cornish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Mulanje Cycad | Direct sun (at least 4-6 hours) | Weekly to fortnightly in summer; every 3–4 weeks in winter | Toxic to pets |
| Muscari armeniacum | Direct sun (at least 4-6 hours) | Rainfall in most settings; water in dry spring spells | Pet-safe |
| Muster-John-Henry | Direct sun (at least 4-6 hours) | Once or twice weekly; allow the top 3 cm of soil to dry between waterings | Mildly toxic to pets |
| Myanmar Purple Ginger | Bright indirect light (just back from a sunny window) | Regular watering to maintain even soil moisture through the growing season. | Mildly toxic to pets |
| Myriophyllum aquaticum | Bright indirect light (just back from a sunny window) | Permanently in water; keep ponds topped up and stable | 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 |
| 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 |
| 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 |
| Narcissus 'February Gold' | Direct sun (at least 4-6 hours) | Moist during autumn-to-spring growth; dry through summer dormancy | Toxic to pets |
| Narcissus 'Ice Follies' | Direct sun (at least 4-6 hours) | Moist in spring growth; drier through summer dormancy | 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-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 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 Watsonia | 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 | Mildly toxic to pets |
| Nasturtium | Direct sun (at least 4-6 hours) | Weekly watering | 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 |
| 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 |
| Nemesia 'Sunsatia Cranberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Neoregelia 'Fireball' | Bright indirect light (just back from a sunny window) | Keep the central cup filled; water the mix when the top 2-3 cm is dry | Pet-safe |
| Nepenthes 'Miranda' | Bright indirect light (just back from a sunny window) | Keep media constantly moist; water every 2-4 days with mineral-free water | Pet-safe |
| Nepenthes × 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 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 Miranda | Bright indirect light (just back from a sunny window) | Keep media damp; water every 2-4 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 spathulata | Bright indirect light (just back from a sunny window) | Keep media moist; water every 2-3 days | Mildly toxic to pets |
| Nepenthes truncata | Bright indirect light (just back from a sunny window) | Keep the medium evenly moist, watering every 2-4 days so it never fully dries | Pet-safe |
| Nepeta 'Six Hills Giant' | Direct sun (at least 4-6 hours) | When soil is dry to a few centimetres; infrequently once established | Mildly toxic to pets |
| Nepeta 'Walker's Low' | Direct sun (at least 4-6 hours) | When the top few centimetres are dry; weekly while establishing | Mildly toxic to pets |
| 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 aster | Direct sun (at least 4-6 hours) | Weekly during the growing season; less frequent once established in cool climates | Pet-safe |
| Night-Blooming Cereus | Bright indirect light (just back from a sunny window) | When the top few cm of mix is dry, roughly every 1-2 weeks in growth | Pet-safe |
| Night-blooming Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce to every 10–14 days in cooler months | Toxic to pets |
| Night-scented stock | Direct sun (at least 4-6 hours) | Every 7–10 days; allow soil to dry between waterings | Pet-safe |
| Ninebark 'Diabolo' | Direct sun (at least 4-6 hours) | Weekly while establishing; established plants only in prolonged drought | Mildly toxic to pets |
| Nodding Enkianthus | Bright indirect light (just back from a sunny window) | Regularly; maintain even soil moisture | Mildly toxic to pets |
| 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 Lupin | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days once established | 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 |
| Northern Needleleaf Air Plant | Bright indirect light (just back from a sunny window) | Soak once a week; mist every 2–3 days | Pet-safe |
| Northern Red Oak | Direct sun (at least 4-6 hours) | Regular deep watering in the first 2-3 years; established trees are moderately drought-tolerant | Mildly toxic to pets |
| 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 |
| 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 |
| 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 'Gonnere' | Direct sun (at least 4-6 hours) | Permanently submerged in still or very slow-moving 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 |
| Nymphoides peltata | Direct sun (at least 4-6 hours) | Permanently submerged; maintain stable pond level | Mildly toxic to pets |
| Obscure Begonia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth, every 14 days in cooler months | Toxic to pets |
| Ohio Spiderwort | Bright indirect light (just back from a sunny window) | Weekly to fortnightly; drought-tolerant once established | Mildly toxic to pets |
| 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 |
| 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 |
| Olson's Begonia | Bright indirect light (just back from a sunny window) | Every 6–9 days during active growth, every 12–14 days in cooler months | Toxic to pets |
| Olympiad Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Oncidium sphacelatum | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth, when the mix approaches dryness | Pet-safe |
| 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 Snow Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 7-10 days in spring and summer; every 4-6 weeks in autumn; none or barely any in winter | Pet-safe |
| 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 |
| Orbea decaisneana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Ord River Sundew | Bright indirect light (just back from a sunny window) | Standing tray method (growing season); minimal watering (rest period) | Pet-safe |
| 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 |
| 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 |
| 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 |
| 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 |
| Paeonia lactiflora 'Karl Rosenfield' | Direct sun (at least 4-6 hours) | Deeply about once a week during active growth; reduce after dormancy | Toxic to pets |
| Pagoda Fawn Lily | Medium indirect light (a couple of metres from a window) | Regular during spring growing season; reduce significantly after dormancy | Mildly 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 sweet pea | Direct sun (at least 4-6 hours) | Every 3–5 days; daily in hot weather | Toxic to pets |
| Painted Nettle | Bright indirect light (just back from a sunny window) | Water when the top 1–2 cm of compost feels dry, roughly every 5–7 days indoors | Toxic to pets |
| Pale Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more frequent in first season | Pet-safe |
| 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 |
| Palo Alto Sweetgum | Direct sun (at least 4-6 hours) | Regular in first 2–3 years; moderate once established | Mildly toxic to pets |
| Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; thereafter only in prolonged drought | Pet-safe |
| Panama Rose | Direct sun (at least 4-6 hours) | Every 5–7 days; allow topsoil to dry slightly between waterings | Mildly toxic to pets |
| 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 |
| 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 |
| Paradox Sundew | Bright indirect light (just back from a sunny window) | Wet tray (growing season); nearly dry (dry season / dormancy) | Pet-safe |
| 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 |
| 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 tricuspidata | Bright indirect light (just back from a sunny window) | Water young plants in dry spells until established, then rarely | Toxic to pets |
| Partridge Pea | Direct sun (at least 4-6 hours) | Low; water during establishment then rely on rainfall | Mildly toxic to pets |
| 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 |
| Pat Austin Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in hot, dry spells | Pet-safe |
| Paul's Glory 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 |
| 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 |
| Peacock Ginger | Medium indirect light (a couple of metres from a window) | Regular during active growth; none during winter dormancy | Pet-safe |
| Pelargonium 'Mr Wren' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Mrs Pollock' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Mystery' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, about every 5-7 days in summer | Toxic to pets |
| Pelargonium 'Paton's Unique' | 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 |
| Pelargonium 'Paul Crampel' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Rollisson's Unique' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, about every 5-7 days in summer | Toxic to pets |
| Pelargonium 'Scarlet Unique' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-7 days in summer | Toxic to pets |
| Pelargonium 'Wilhelm Langguth' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, about every 5-7 days in summer | Toxic to pets |
| Pelargonium peltatum 'Roi des Balcons Lilas' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost dries, often every 3-7 days in summer | Toxic to pets |
| Pelargonium peltatum 'Sofie Cascade' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost dries, often every 3-7 days in summer | Toxic to pets |
| Pelargonium peltatum 'Tomcat' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days in summer | 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 |
| Penstemon 'Raven' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries, roughly weekly in summer | Mildly toxic to pets |
| Peony Lotus | Direct sun (at least 4-6 hours) | Aquatic — permanently in still or gently circulating water | Mildly toxic to pets |
| Peperomia glabella | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia Hope | Bright indirect light (just back from a sunny window) | Every 1-2 weeks | Pet-safe |
| Peperomia nitida 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| 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 |
| Persian Shield | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 inch) of soil dries | Mildly toxic to pets |
| Persicaria amplexicaulis 'Alba' | Direct sun (at least 4-6 hours) | Keep soil moist; water every 3-5 days in dry spells, especially in sun | Mildly toxic to pets |
| Persicaria amplexicaulis 'Blackfield' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days during dry weather | Mildly toxic to pets |
| Persicaria amplexicaulis 'Firetail' | Direct sun (at least 4-6 hours) | Keep evenly moist; water whenever the surface starts to dry, more in heat | Mildly toxic to pets |
| 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 Pamianthe | Bright indirect light (just back from a sunny window) | Water regularly during growth; reduce significantly after flowering | Toxic to pets |
| Petunia 'Supertunia Royal Velvet' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, frequently daily for containers in summer | Pet-safe |
| Petunia 'Supertunia Vista Bubblegum' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, often daily for containers in summer heat | Pet-safe |
| Petunia 'Wave Purple' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, often daily in summer for baskets and containers | Pet-safe |
| Philadelphus 'Virginal' | Direct sun (at least 4-6 hours) | Weekly while establishing, then occasional deep watering | Mildly toxic to pets |
| Philodendron 'Florida Green' | Bright indirect light (just back from a sunny window) | Roughly weekly in spring/summer, every 10-14 days in winter | Toxic to pets |
| Philodendron 'Moonlight' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 inch) of soil is dry, roughly weekly in summer | 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 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 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 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 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 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 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 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 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 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 Pink Congo | 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 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 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 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 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 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 Tenue | 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 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 |
| Phlox drummondii 'Intensia Cabernet' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Phragmipedium 'Living Fire' | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; water every 1-3 days, often standing the pot in a shallow tray of clean water | Pet-safe |
| Phragmipedium Eric Young | Bright indirect light (just back from a sunny window) | Keep evenly moist at all times; water every 2-4 days or stand the pot in 1-2 cm of water | Pet-safe |
| Phragmipedium longifolium | Bright indirect light (just back from a sunny window) | Keep constantly moist; water every 1-3 days, often with the pot standing in a shallow tray of clean water | Pet-safe |
| 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 |
| Pilea 'Friendship' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-8 days | Pet-safe |
| Pilea cadierei 'Silver Tree' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Pet-safe |
| Pilea libanensis | 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 |
| Pilea mollis | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pilea nummulariifolia | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Pillans' Watsonia | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-14 days during spring and early summer | Mildly toxic to pets |
| 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 |
| Pinguicula 'Aphrodite' | Bright indirect light (just back from a sunny window) | Tray-water to keep the mix moist in growth; reduce for the drier winter rest | Mildly toxic to pets |
| Pinguicula 'Tina' | Bright indirect light (just back from a sunny window) | Keep lightly moist in summer; let the surface dry slightly between waterings in winter | Mildly toxic to pets |
| 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 Dipladenia | Direct sun (at least 4-6 hours) | Every 5–7 days in summer; every 10–14 days in winter | Mildly toxic to pets |
| Pink Evening Primrose | Direct sun (at least 4-6 hours) | Every 1–2 weeks once established; less in cool periods | Mildly toxic to pets |
| Pink Ice Plant | Direct sun (at least 4-6 hours) | Weekly in spring and summer growing season; every 2–3 weeks in autumn; rarely in winter | Mildly toxic to pets |
| Pink Knock Out Rose | Direct sun (at least 4-6 hours) | About 2.5 cm of water weekly, deep soak | Pet-safe |
| Pink 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 Panther episcia | Bright indirect light (just back from a sunny window) | Allow the top centimetre of soil to dry before watering — approximately every 5–7 days in the growing season. | Pet-safe |
| Pink Rain Lily | Direct sun (at least 4-6 hours) | Regular in summer; minimal in winter | Mildly toxic to pets |
| Pink Spur Flower | Medium indirect light (a couple of metres from a window) | Moderate — water when top 3 cm of soil dries out | Mildly toxic to pets |
| Pink Trumpet Vine | Direct sun (at least 4-6 hours) | Every 7 days in summer; every 14–21 days in winter | Mildly toxic to pets |
| Pink Vygie | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is fully dry, roughly every 7-14 days in spring-summer; very sparingly in winter (once monthly or less) | Pet-safe |
| Pirri-Pirri Bur | Direct sun (at least 4-6 hours) | Fortnightly once established; drought-tolerant | Pet-safe |
| Pistia stratiotes | Direct sun (at least 4-6 hours) | Floats permanently on water; keep the water body topped up and the rosette crown dry | Toxic to pets |
| Plains Coreopsis | Direct sun (at least 4-6 hours) | Low; once established, water only during prolonged drought | Pet-safe |
| Plectranthus scutellarioides 'Freckles' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Rainbow Festive Dance' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Pleurothallis restrepioides | Low light (north window or shaded room) | Keep evenly moist, watering roughly every 2-3 days; do not allow a hard dry-out | Mildly toxic to pets |
| Pogostemon stellatus | Bright indirect light (just back from a sunny window) | Permanently submerged; 25-50% weekly water changes | Mildly toxic to pets |
| Pohl's Air Plant | Bright indirect light (just back from a sunny window) | Soak for 20–30 minutes once per week, or mist thoroughly 2–3 times per week; reduce frequency in cool winter months. | Pet-safe |
| Polka Dot Begonia | 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 |
| Polka Dot Plant | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil feels dry, roughly every 5-7 days in the growing season | Pet-safe |
| 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 |
| Pontederia cordata | Direct sun (at least 4-6 hours) | Keep in standing water year-round | Mildly toxic to pets |
| Poplar-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Low — establishment watering then rain-fed | 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 |
| 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 |
| 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 |
| Powder Puff Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in spring and summer; once every 4-6 weeks in winter | Pet-safe |
| Pretty Crocus | Direct sun (at least 4-6 hours) | Low — rainfall-dependent during active growth; fully dry during summer dormancy | Mildly toxic to pets |
| Pride of Brazil Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth (spring–summer); every 14–21 days during the winter rest | 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 |
| primrose-leaf cape primrose | Medium indirect light (a couple of metres from a window) | Every 7–10 days; keep evenly moist but never waterlogged | Pet-safe |
| 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 |
| 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 '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 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 |
| 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 Dragon Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–10 days; water more frequently in hot, dry periods | Pet-safe |
| Purple Glory Tree | Direct sun (at least 4-6 hours) | Water regularly in spring and summer to keep soil consistently moist; reduce in cooler months. | Mildly toxic to pets |
| Purple Heart | Bright indirect light (just back from a sunny window) | When the top inch of soil dries out, roughly weekly in summer and every 2 weeks in winter | Toxic to pets |
| Purple Mountain Heath | Bright indirect light (just back from a sunny window) | Regular — keep consistently moist but never waterlogged | Mildly toxic to pets |
| Purple Passion Plant | Bright indirect light (just back from a sunny window) | Every 7 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Purple 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 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-Top Germander | Bright indirect light (just back from a sunny window) | Weekly to fortnightly in summer; reduce in autumn and winter | Mildly toxic to pets |
| 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 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 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 |
| 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 |
| Quila Bamboo | Medium indirect light (a couple of metres from a window) | Weekly to twice weekly during growing season; reduce in winter | Pet-safe |
| Rainbow Pincushion | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Rainbow Plant | Direct sun (at least 4-6 hours) | Keep substrate consistently wet using the tray method | 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/summer; sparingly in winter | Mildly 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 Barrenwort | Medium indirect light (a couple of metres from a window) | Weekly during establishment; established plants need watering only during extended summer drought | Mildly toxic to pets |
| Red 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 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 larkspur | Direct sun (at least 4-6 hours) | Moderate — water once or twice weekly during spring growth; allow to dry out in summer dormancy | Toxic to pets |
| Red Margin Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during establishment; weekly once mature | Pet-safe |
| 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 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 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 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 Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more frequent in first season | 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-Topped Sage | Direct sun (at least 4-6 hours) | Water when the top 3 cm of soil feels dry | Pet-safe |
| 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 Red Bells | Bright indirect light (just back from a sunny window) | Regularly during the growing season; reduce in winter | Mildly toxic to pets |
| Reed Sweetgrass | Direct sun (at least 4-6 hours) | Shallow to moderate aquatic; submerged 0–30 cm; tolerates winter flooding | Mildly toxic to pets |
| Reed-stem orchid | Bright indirect light (just back from a sunny window) | Every 4-5 days in warm growth; about weekly when cool | Pet-safe |
| Regel's Sage | Direct sun (at least 4-6 hours) | Moderate; approximately 2.5 cm (1 inch) per week | Pet-safe |
| Reunion Island Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of compost feels dry, approximately every 7 days | Toxic to pets |
| Rex Spider Orchid | Bright indirect light (just back from a sunny window) | 2–3 times per week during active growth; weekly or less in cooler rest period | Pet-safe |
| 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 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 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 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 |
| Rhizomatous Begonia 'Cleopatra' | 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 |
| 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 '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 |
| Ribbon Bush | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; reduce to every 14 days in winter rest | Pet-safe |
| Ribbon Grass | Bright indirect light (just back from a sunny window) | Adaptable; keep moist for best foliage but tolerates dry once established | Mildly toxic to pets |
| Riccia fluitans | Bright indirect light (just back from a sunny window) | Fully submerged or floating; 25-50% water change weekly | Mildly toxic to pets |
| rice cutgrass | Bright indirect light (just back from a sunny window) | Constantly moist to permanently flooded; thrives in standing water at or just above soil level | Pet-safe |
| Ring Fern | Bright indirect light (just back from a sunny window) | Water when the top 3–5 cm of soil is dry — more drought-tolerant than most ferns once established | Mildly toxic to pets |
| Rise 'n' Shine Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, around every 2-4 days in summer | Pet-safe |
| Robert Young Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week when establishing; weekly 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 Cress | Direct sun (at least 4-6 hours) | Low; water only when soil has dried out, roughly every 10–14 days in summer | Pet-safe |
| Rocket Mixed snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; maintain consistent soil moisture | 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 of Sharon 'Diana' | Direct sun (at least 4-6 hours) | Weekly to establish, then during dry and hot periods | Pet-safe |
| 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 |
| Roseraie de l'Hay Rose | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once settled | 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 |
| Rotala indica | Bright indirect light (just back from a sunny window) | Submerged permanently; 30-50% aquarium water changes weekly | Mildly toxic to pets |
| Rotala rotundifolia | Bright indirect light (just back from a sunny window) | Submerged permanently; 30-50% aquarium water changes weekly | Mildly toxic to pets |
| 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-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 |
| Royal Trumpet Vine | Direct sun (at least 4-6 hours) | Twice weekly in summer; weekly in cooler months | Mildly toxic to pets |
| Ruby Necklace | Bright indirect light (just back from a sunny window) | Roughly every 1-3 weeks; let the soil dry out completely between waterings | Mildly toxic to pets |
| Rudbeckia 'Indian Summer' | 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 |
| Ruellia Brittoniana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-10 days; very drought-tolerant once established | Mildly toxic to pets |
| Ruffled Echeveria | Bright indirect light (just back from a sunny window) | When the soil dries fully, roughly every 10-14 days in growth | Pet-safe |
| Ruffled Sword Plant | Bright indirect light (just back from a sunny window) | Submerged aquatic — 25-30% weekly water changes are recommended for large aquariums. | Toxic to pets |
| Rugosa Rose | Direct sun (at least 4-6 hours) | weekly when establishing, monthly once established | Pet-safe |
| Running Tapestry Foamflower | Medium indirect light (a couple of metres from a window) | Every 5–7 days; more during summer drought | Pet-safe |
| Running Tapestry Tiarella | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply once or twice weekly in dry spells | Mildly toxic to pets |
| Russell Lupin 'Band of Nobles' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Rustica Rubra magnolia | Direct sun (at least 4-6 hours) | Regularly when young; moderate once established | Pet-safe |
| Rustyback Fern | Bright indirect light (just back from a sunny window) | Infrequently; allow to dry between waterings | Pet-safe |
| Ryegrass Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week or soak for 20 minutes weekly | Pet-safe |
| Sabre-Leaved Hottentot Fig | Direct sun (at least 4-6 hours) | very low — water only when soil is dry | 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 |
| Saffron Pepper | Bright indirect light (just back from a sunny window) | Every 5–8 days; allow top 2–3 cm of soil to dry | Mildly toxic to pets |
| Sagae Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Sage-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Deeply but infrequently once established; every 2–3 weeks in the first two summers, then rainfall alone suffices in most UK/mild US climates. | Mildly toxic to pets |
| 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 |
| 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 |
| Saintpaulia 'Optimara Montana' | Bright indirect light (just back from a sunny window) | When the surface of the mix is just dry, roughly every 5-7 days | Pet-safe |
| 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 |
| Salvinia molesta | Bright indirect light (just back from a sunny window) | Keep floating on warm, calm freshwater at all times; top up evaporation | 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 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 Reed | Direct sun (at least 4-6 hours) | Rarely — depends on deep soil moisture in sand | Pet-safe |
| Sanguisorba menziesii | Direct sun (at least 4-6 hours) | Keep soil moist; water every 3-5 days in dry spells | Pet-safe |
| Sansevieria Liberica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Nilotica | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Senegambica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Santol | Direct sun (at least 4-6 hours) | 2–3 times per week when establishing; established trees tolerate short dry spells | Mildly toxic to pets |
| Sanvitalia procumbens 'Sunvy Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer containers | Pet-safe |
| 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 |
| 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 |
| Sarracenia 'Juthatip Soper' | Direct sun (at least 4-6 hours) | Keep permanently wet with the tray method, standing in 1-3 cm of water during the growing season | Pet-safe |
| Sarracenia × catesbaei | Direct sun (at least 4-6 hours) | Keep media constantly wet; stand the pot in 1-2 cm of water during the growing season | Pet-safe |
| Saunders' Billbergia | Medium indirect light (a couple of metres from a window) | Refill the central cup every 7-10 days; water the medium only when the top 3 cm is completely dry, roughly every 14-21 days | Pet-safe |
| Scabrosa Rugosa Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant afterwards | Pet-safe |
| Scaevola aemula 'Whirlwind White' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm dries; baskets often need it every 1-3 days | Mildly toxic to pets |
| Scarlet Bee Balm | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; often twice weekly in summer heat | Mildly toxic to pets |
| Scarlet Bidi-Bidi | Direct sun (at least 4-6 hours) | Fortnightly once established; drought-tolerant | Pet-safe |
| Scarlet Cleistocactus | Bright indirect light (just back from a sunny window) | When the soil is dry, about every 7-10 days in summer; sparing in winter | Pet-safe |
| Scarlet 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 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 |
| Scharff's Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days, allowing the top 2–3 cm to dry between waterings | Toxic to pets |
| Schefflera | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Schismatoglottis Calyptrata | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is just dry, roughly every 5-7 days, keeping it evenly moist | 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 |
| 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 |
| Schwantes' Living Stone | Direct sun (at least 4-6 hours) | Every 10-21 days during the active autumn-to-spring period; none in summer | Pet-safe |
| Scilla siberica | Direct sun (at least 4-6 hours) | Rainfall in most settings; rarely needs watering | 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 |
| 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 Mouse-ear | Direct sun (at least 4-6 hours) | Minimal; rely on rainfall in outdoor settings | Mildly toxic to pets |
| Selenicereus anthonyanus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days in summer | Pet-safe |
| 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 |
| 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 |
| Sensitive Fern | Medium indirect light (a couple of metres from a window) | Keep continuously moist to wet; check every 2-3 days | Mildly toxic to pets |
| Serrated Enkianthus | Bright indirect light (just back from a sunny window) | Regular — even moisture throughout growing season | Toxic to pets |
| Shady Sage | Bright indirect light (just back from a sunny window) | Allow soil to dry between waterings | Pet-safe |
| Shallon | Medium indirect light (a couple of metres from a window) | Moderate; drought-tolerant once established | Mildly toxic to pets |
| Sharp-leaf Columnea | Bright indirect light (just back from a sunny window) | When top 2–3 cm of compost dries out | Pet-safe |
| Sharp-lobed Begonia | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; less in winter | 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 |
| Shimpaku Juniper | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is just dry, often daily in summer heat | Toxic to pets |
| 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-Leaf Begonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer, every 10–14 days in winter | Toxic to pets |
| Showy Autumn Crocus | Bright indirect light (just back from a sunny window) | Relies on natural rainfall; rarely needs supplementary watering in the garden | Toxic to pets |
| 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 Cranesbill | Bright indirect light (just back from a sunny window) | Weekly during spring and summer; minimal in autumn and winter | Pet-safe |
| Shrubby St John's Wort | Bright indirect light (just back from a sunny window) | Drought-tolerant once established; water through the first season | Toxic to pets |
| 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 |
| 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 Brake Fern | Medium indirect light (a couple of metres from a window) | Twice weekly in summer; weekly in winter | Pet-safe |
| Silver Cup Annual Mallow | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 7-10 days | 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 Pink Rock Rose | Direct sun (at least 4-6 hours) | Establish with regular watering in the first season; once established, water only during prolonged drought spells in summer. | Mildly toxic to pets |
| Silver Spurflower | Bright indirect light (just back from a sunny window) | Water when the top 2–3 cm of compost is dry, roughly every 6–10 days in the growing season | Mildly toxic to pets |
| 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 Yellow Frangipani | Direct sun (at least 4-6 hours) | Weekly to fortnightly during active growth; very sparingly in winter dormancy | Toxic to pets |
| Sitka Spruce | Direct sun (at least 4-6 hours) | Regular — keep soil consistently moist; very high natural rainfall in native habitat | Pet-safe |
| Six Hills Giant Catmint | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; about every 7-10 days while establishing, then seldom | Mildly toxic to pets |
| Skinners Achimenes | Bright indirect light (just back from a sunny window) | Consistently moist throughout the growing season; dry during winter dormancy | Pet-safe |
| 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 |
| Slender Waterweed | Medium indirect light (a couple of metres from a window) | Fully submerged aquatic; maintain in aquarium or pond water continuously | Pet-safe |
| Small-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–5 weeks in winter | Pet-safe |
| Small-leaved 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 Oxeye | Direct sun (at least 4-6 hours) | Every 1-2 weeks | Pet-safe |
| 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 |
| Sneezeweed 'Riverton Beauty' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Toxic to pets |
| Sneezewort | Direct sun (at least 4-6 hours) | Weekly or more in dry spells; tolerates seasonal moisture | Mildly toxic to pets |
| Snow-in-Summer | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Pet-safe |
| snowball bush | Bright indirect light (just back from a sunny window) | Weekly when young; every 1–2 weeks once established | Mildly toxic to pets |
| Soft Hornwort | Medium indirect light (a couple of metres from a window) | Fully aquatic; maintain floating or loosely anchored in aquarium or pond water | 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 |
| 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 Lady Fern | Medium indirect light (a couple of metres from a window) | Every 2–4 days in warm weather; soil should never fully dry out | Mildly toxic to pets |
| Southern Maidenhair Fern | Bright indirect light (just back from a sunny window) | Frequent — keep soil consistently moist | Pet-safe |
| Southern Naiad | Medium indirect light (a couple of metres from a window) | Fully submerged; 20-25% water change weekly in aquariums | Mildly toxic to pets |
| Southern Shield Fern | Bright indirect light (just back from a sunny window) | Water when the top 3-4 cm of soil dries out, roughly every 5-10 days in summer; reduce in winter | Mildly toxic to pets |
| 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 Bluebell | Medium indirect light (a couple of metres from a window) | Low to moderate; largely self-sufficient once established | Toxic to pets |
| Sparganium erectum | Direct sun (at least 4-6 hours) | Constantly wet; shallow water or saturated margin | Mildly toxic to pets |
| Spathiphyllum 'Mauna Loa' | 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 |
| 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 |
| Spike Moss | Medium indirect light (a couple of metres from a window) | Keep evenly moist at all times; typically water every 2-4 days so the soil never dries out | Pet-safe |
| Spiked Kohleria | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; reduce in winter | Pet-safe |
| Spiny Billbergia | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Spiny Club Cactus | Direct sun (at least 4-6 hours) | When soil is dry, about every 10-14 days in summer; little to none in winter | Pet-safe |
| 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 'Little Princess' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about once per week | Mildly toxic to pets |
| Spiraea 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 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 |
| Spotted Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 5–7 days in active growth; reduce to every 10–14 days in cool or dormant periods | Pet-safe |
| Spotted Dumb Cane | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer; every 14 days in winter | Toxic to pets |
| spotted episcia | Bright indirect light (just back from a sunny window) | Water when the soil surface begins to dry slightly — roughly every 5–7 days in warm conditions. | Pet-safe |
| Spreading Spike Moss | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; check every 2-3 days | Pet-safe |
| Springwood White winter heath | Direct sun (at least 4-6 hours) | Weekly for new plantings; established plants tolerate dry spells with watering every 2–3 weeks | Pet-safe |
| 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 of Bethlehem | Direct sun (at least 4-6 hours) | Infrequent; relies on natural rainfall in most temperate gardens | 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 |
| Sterling Silver Linden | Direct sun (at least 4-6 hours) | Weekly during the first 2 years; monthly deep watering once established | Pet-safe |
| Stonecrop 'Dragon's Blood' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days; minimal once established | Pet-safe |
| Stratiotes aloides | Direct sun (at least 4-6 hours) | Submerged to surface-floating; keep in still water 0.3-1.5 m deep | Mildly toxic to pets |
| Strawberries and Cream Ribbon Grass | Bright indirect light (just back from a sunny window) | Adaptable; moist soil gives best colour but tolerates drought once established | Mildly toxic to pets |
| Strict Hygrophila | Bright indirect light (just back from a sunny window) | Fully submerged aquatic plant; keep in aquarium water at all times | Pet-safe |
| String of Buttons | Direct sun (at least 4-6 hours) | Every 1-2 weeks in growing season; roughly monthly in winter | Mildly toxic to pets |
| String of 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 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 Raindrops | Bright indirect light (just back from a sunny window) | When the compost is dry right through, roughly every 10-14 days in summer and every 3-4 weeks in winter | Toxic to pets |
| String of Tears | Bright indirect light (just back from a sunny window) | Roughly every 7-14 days in spring and summer; about once a month in winter. | Toxic to pets |
| String of Tears | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Striptease 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 |
| Stromanthe Jacquinii | 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 |
| Sulcorebutia steinbachii | Direct sun (at least 4-6 hours) | When fully dry in summer, roughly every 10-14 days; none in winter | Pet-safe |
| Sulphur Cosmos | Direct sun (at least 4-6 hours) | Water until established, then only in extended drought; highly drought-tolerant | Pet-safe |
| Sunflower | Direct sun (at least 4-6 hours) | Deep watering once a week | Pet-safe |
| 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 Astilbe | Bright indirect light (just back from a sunny window) | Keep soil moist; water when the top 2-3 cm dries, roughly every 4-6 days in summer | Mildly toxic to pets |
| Supertunia 'Vista Bubblegum' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; daily in hot weather and containers | Pet-safe |
| Supertunia bubblegum petunia | Direct sun (at least 4-6 hours) | Every 2–4 days in containers in heat; every 5–7 days in borders | Pet-safe |
| Swedish Ivy | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly weekly in summer | Pet-safe |
| 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 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 '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 |
| Sweetbriar Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then minimal | Pet-safe |
| Swordleaf Rush | Direct sun (at least 4-6 hours) | Consistently moist to wet soil; tolerates shallow standing water to 5 cm (2 in) | Pet-safe |
| Syagrus Romanzoffiana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-10 days in heat | Pet-safe |
| 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 |
| Symphyotrichum novi-belgii 'Fellowship' | Direct sun (at least 4-6 hours) | Keep soil reliably moist; water deeply, around weekly, never letting roots dry | Pet-safe |
| 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 |
| Tailed Brake Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days in the growing season; every 7 days in winter | Pet-safe |
| Tall Bluebells | Bright indirect light (just back from a sunny window) | Water deeply 2–3 times weekly; never allow to dry out in growing season | Pet-safe |
| Tall Goldenrod | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water only in extended dry spells | Pet-safe |
| Tall Green Milkweed | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Toxic to pets |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| Tessellated Vanda | Direct sun (at least 4-6 hours) | Daily in heat; every 2-3 days in cool, low-light spells | Pet-safe |
| 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 |
| Texas Nipple Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Thai Silk California poppy | Direct sun (at least 4-6 hours) | Once weekly during establishment; every 2 weeks once established | Mildly toxic to pets |
| Thalictrum flavum subsp. glaucum | Direct sun (at least 4-6 hours) | Keep soil moist; water deeply in dry weather | Mildly toxic to pets |
| 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 |
| Thelma's Begonia | Medium indirect light (a couple of metres from a window) | Every 7–10 days, allowing the top 2 cm of compost to partially dry | Toxic to pets |
| Therese Bugnet Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | 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 |
| Thread-Leaved Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week, or soak for 20–30 minutes once a week | Pet-safe |
| Three-leaved Lantana | Direct sun (at least 4-6 hours) | Every 1–2 weeks | Toxic to pets |
| Thunberg's astilbe | Medium indirect light (a couple of metres from a window) | Regular — every 2–3 days in warm weather; reduce in cool, overcast periods | Pet-safe |
| 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 |
| Tilia cordata | Direct sun (at least 4-6 hours) | Water young trees deeply every 7-14 days in dry spells for the first two seasons; established trees are largely self-sufficient | Pet-safe |
| Tilia tomentosa 'Petiolaris' | Direct sun (at least 4-6 hours) | Deep watering every 7-14 days during dry weather for the first two or three seasons; established trees seldom need it | Pet-safe |
| Tillandsia aeranthos | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly | Pet-safe |
| Tojen Toad Lily | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, roughly once or twice a week in summer | Mildly toxic to pets |
| 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 Davallia | Bright indirect light (just back from a sunny window) | Every 4–6 days in summer, every 8–12 days in winter | Pet-safe |
| Toothed Fuchsia | Bright indirect light (just back from a sunny window) | Regular — keep evenly moist | Pet-safe |
| Torch Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Torenia fournieri 'Summer Wave Large Violet' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water every 2-4 days, daily for baskets in heat | Mildly toxic to pets |
| Touch of Class Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Tradescantia 'Bubblegum' | 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 |
| Tradescantia 'Lilac' | 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 |
| Tradescantia 'Lilac' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Tradescantia 'Nanouk' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 7-10 days in summer and less in winter | Toxic to pets |
| Tradescantia blossfeldiana | 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 |
| Tradescantia fluminensis 'Tricolor' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Tradescantia fluminensis 'Variegata' | 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 |
| Tradescantia mundula | 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 |
| Tradescantia Sillamontana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Tradescantia Zebrina 'Quadricolor' | 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 |
| Trailing African daisy | Direct sun (at least 4-6 hours) | Once or twice a week during active growth; reduce to once a week or less once established | Pet-safe |
| trailing clog plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in spring–summer, every 12–14 days in autumn–winter | Pet-safe |
| Trailing Iceplant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; minimal in winter | Mildly toxic to pets |
| Transylvanian Hepatica | Medium indirect light (a couple of metres from a window) | Every 5–7 days in spring and autumn; every 10–14 days in summer | Mildly toxic to pets |
| Transylvanian Sage | Bright indirect light (just back from a sunny window) | Moderate — every 7–10 days in summer | Mildly toxic to pets |
| Trembling Brake Fern | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil feels dry, roughly every 5-7 days in summer | Pet-safe |
| Tremula Pteris Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of mix is dry, roughly every 4-6 days | Pet-safe |
| 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 |
| 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 Dewy Pine | Direct sun (at least 4-6 hours) | Keep medium wet to moist at all times; tray method with 1–2 cm water | Pet-safe |
| Tropical Sundew | Bright indirect light (just back from a sunny window) | Keep tray permanently wet | Pet-safe |
| Tufted Vetch | Direct sun (at least 4-6 hours) | Low to moderate — tolerates periodic dry spells once established | Mildly toxic to pets |
| Turkestan Tulip | Direct sun (at least 4-6 hours) | Minimal; water once at planting; rely on natural rainfall during growth; completely dry during summer dormancy | Toxic to pets |
| Turkey Oak | Direct sun (at least 4-6 hours) | Occasional once established; more frequent in first 2–3 years | Mildly toxic to pets |
| Turtle Vine | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (about 1 inch) of soil feels dry, roughly weekly in summer | Mildly toxic to pets |
| Twiggy Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting; substrate must stay consistently moist | Pet-safe |
| Twin-Flowered Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week, or a 20-minute soak once a week | Pet-safe |
| Two-Flowered Everlasting Pea | Direct sun (at least 4-6 hours) | Every 7–10 days during dry spells; rarely needs watering once established | Mildly toxic to pets |
| Two-leaf Squill | Bright indirect light (just back from a sunny window) | Naturally watered in spring; needs no supplemental irrigation once established | 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 |
| 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 |
| Uproar Rose zinnia | Direct sun (at least 4-6 hours) | Regular; deep watering 2–3 times per week at soil level | Pet-safe |
| Valdez's Aztec Cactus | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 14-28 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Vallisneria americana | 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 |
| 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 |
| Vallisneria spiralis | 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 'Fuchs Delight' | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days when cool or low-light | Pet-safe |
| Vanda 'Miss Joaquim' | Direct sun (at least 4-6 hours) | Daily in warm, bright conditions; every 2-3 days if cooler | Pet-safe |
| 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 |
| Variegated Basket Grass | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Variegated Cord Grass | Direct sun (at least 4-6 hours) | Keep consistently moist to wet; never let it dry out | Mildly toxic to pets |
| Variegated Giant Reed | Direct sun (at least 4-6 hours) | Frequently; keep consistently moist | Mildly toxic to pets |
| Variegated Greater Periwinkle | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce to every 10–14 days in cooler months | Toxic to pets |
| Variegated Greater Pond Sedge | Bright indirect light (just back from a sunny window) | Keep consistently wet — tolerates standing water | Pet-safe |
| Variegated Japanese Spurge | Medium indirect light (a couple of metres from a window) | Every 5–7 days during establishment; once established, water during dry spells | Mildly toxic to pets |
| Variegated String of Pearls | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Vasey's Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist through spring; reduce over summer dormancy | Mildly 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 |
| 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 |
| Venus Flytrap 'Dente' | Direct sun (at least 4-6 hours) | Keep the soil constantly wet; top up the tray as it dries, near-daily in summer | Pet-safe |
| Verbena × hybrida 'Superbena Stormburst' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 2-4 days in summer | Mildly toxic to pets |
| 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 |
| Vidal's Lady Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; reduce in winter | Pet-safe |
| Virgin Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate permanently moist; shallow tray method | 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 Chain Fern | Medium indirect light (a couple of metres from a window) | Frequently — keep soil consistently moist to wet | Pet-safe |
| Virginia Pine Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, frequently daily in summer and every few days in cooler months | Pet-safe |
| Virginia Stock | Bright indirect light (just back from a sunny window) | Weekly (keep soil evenly moist but not waterlogged) | Mildly toxic to pets |
| Vitis coignetiae | Direct sun (at least 4-6 hours) | Water young vines in dry spells; established plants are largely self-sufficient | Toxic to pets |
| Vriesea 'Poelmanii' | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| 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 |
| Wandering dude | 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 |
| Warszewiczs Kohleria | Bright indirect light (just back from a sunny window) | Every 7–10 days during growth; minimal during dormancy | Pet-safe |
| Wart Fern | 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 | Mildly 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 Clover Fern | Bright indirect light (just back from a sunny window) | Always in standing water; top up to keep the rhizome submerged | Mildly toxic to pets |
| Water Horsetail | Direct sun (at least 4-6 hours) | Submerged or saturated | Mildly toxic to pets |
| Water Spangles | Bright indirect light (just back from a sunny window) | Permanent floating aquatic — sits on the water surface | Pet-safe |
| Water Speedwell | Direct sun (at least 4-6 hours) | Permanently wet to shallow submersion | Pet-safe |
| Wave Petunia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in baskets and hot weather | Pet-safe |
| Wave purple petunia | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 7–10 days in borders | Pet-safe |
| Wavy Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; every 14 days in winter | Toxic to pets |
| Wax-Leaf Begonia | Bright indirect light (just back from a sunny window) | When the top 1–2 cm of soil feels dry | Toxic to pets |
| wayfaring tree | Direct sun (at least 4-6 hours) | Weekly when young; rarely needed once established | Mildly toxic to pets |
| Weeping Fig Variegata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| weeping forsythia | Direct sun (at least 4-6 hours) | Weekly during first growing season; established plants need watering only during prolonged drought | Mildly toxic to pets |
| Weeping Giant Sequoia | Direct sun (at least 4-6 hours) | Every 1–2 weeks when young; monthly once established in moist climates | Pet-safe |
| Weeping Love Grass | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; weekly during establishment | Pet-safe |
| 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 '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 |
| 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 Red Cedar | Direct sun (at least 4-6 hours) | Regular — water deeply once or twice a week until established; drought-sensitive | Pet-safe |
| Western Spirea | Direct sun (at least 4-6 hours) | Every 5-7 days or as needed to keep soil consistently moist | Pet-safe |
| Wheeler's Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Whip Brassavola | Bright indirect light (just back from a sunny window) | Every 3–5 days in summer; every 7–10 days in winter | Pet-safe |
| White Ash | Direct sun (at least 4-6 hours) | Moderate; water weekly when young; moderate drought tolerance once established | Mildly toxic to pets |
| 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 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 Lotus Lily | Direct sun (at least 4-6 hours) | Fully aquatic; roots submerged, leaves floating or emergent | Mildly toxic to pets |
| White Marsh Marigold | Bright indirect light (just back from a sunny window) | Permanently moist to boggy; crown should sit just above water level | 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 Periwinkle | Medium indirect light (a couple of metres from a window) | Weekly during establishment; self-sufficient in average rainfall once established | Toxic to pets |
| White 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 Trillium | Medium indirect light (a couple of metres from a window) | Weekly during spring growth; reduce after dormancy | Mildly 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-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 |
| 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 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 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 Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then rarely once mature | Pet-safe |
| Wild's Pincushion | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once every 3-4 weeks in winter | Pet-safe |
| Willow-leaf Fig | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil feels dry, roughly every 3-7 days | 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 |
| Winter Aconite | Medium indirect light (a couple of metres from a window) | Relies on natural rainfall; keep soil moist during active growth | Toxic to pets |
| Winter Heath Springwood White | Direct sun (at least 4-6 hours) | Weekly during dry spells; drought-tolerant once established | Mildly 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 |
| Wolffia arrhiza | Bright indirect light (just back from a sunny window) | Floats permanently on still water; no separate watering | Mildly toxic to pets |
| Wonderful Puya | Direct sun (at least 4-6 hours) | Weekly in summer, once every 2–3 weeks in winter | Mildly toxic to pets |
| Wonga Wonga Vine | Bright indirect light (just back from a sunny window) | Every 7–10 days when young; largely self-sufficient once established in ground | Mildly toxic to pets |
| Wood Sedge | Low light (north window or shaded room) | Keep evenly moist; water weekly or more in summer | 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 |
| 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 |
| Yellow Archangel | Medium indirect light (a couple of metres from a window) | Every 7–14 days; drought-tolerant once established in shade | Mildly toxic to pets |
| Yellow Barrenwort | Medium indirect light (a couple of metres from a window) | Weekly during first two seasons; established plants are drought-tolerant and rarely need supplemental watering | Mildly toxic to pets |
| Yellow Cabomba | Bright indirect light (just back from a sunny window) | Fully submerged aquatic; maintain in aquarium water continuously | 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 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 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 Glacier Lily | Medium indirect light (a couple of metres from a window) | Regular during spring growth; reduce sharply after dormancy | Mildly toxic to pets |
| Yellow Groove Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; every 2 weeks when dormant | Pet-safe |
| Yellow Loosestrife | Medium indirect light (a couple of metres from a window) | Regularly, keeping soil consistently moist | Mildly toxic to pets |
| Yellow Mombin | Direct sun (at least 4-6 hours) | Every 7–14 days; highly drought-tolerant when established | Pet-safe |
| Yellow 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 Pitcher | Direct sun (at least 4-6 hours) | Keep the growing medium permanently moist using the tray method — 3-5 cm of water in the saucer at all times | Pet-safe |
| 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 Water Lily | Direct sun (at least 4-6 hours) | Permanently aquatic — crown submerged 15–45 cm (6–18 in) below water surface | Pet-safe |
| Yellow-White Maxillaria | Bright indirect light (just back from a sunny window) | Every 2–3 days in growth, every 4–5 days in winter | Pet-safe |
| Yoshino Cherry | Direct sun (at least 4-6 hours) | Water young trees weekly in dry weather; established trees need little | 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 Clover | Medium indirect light (a couple of metres from a window) | Moderate; tolerates short dry spells once established | Pet-safe |
| Zygopetalum 'Artur Elle' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, every 5-7 days, easing back as pseudobulbs mature | Pet-safe |