| Abiqua Drinking Gourd 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 |
| Achillea 'Terracotta' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry; roughly every 7-10 days while establishing, rarely once mature | Toxic to pets |
| Achillea 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 |
| Aesculus × carnea 'Briotii' | Direct sun (at least 4-6 hours) | Water young trees weekly to establish, then rely on rainfall | Toxic to pets |
| Aesculus flava | Direct sun (at least 4-6 hours) | Deep watering every 7-10 days through the first two or three growing seasons; established trees rarely need irrigation | Toxic to pets |
| Aesculus hippocastanum | Direct sun (at least 4-6 hours) | Water young trees weekly to establish, then rely on rainfall | Toxic to pets |
| Affinis Taro | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the top 1-2 cm of soil dries, roughly every 4-7 days | Toxic to pets |
| Afghan Iris | Direct sun (at least 4-6 hours) | Moderate in late winter to late spring; bone dry from midsummer to early autumn | Toxic to pets |
| African Fern Pine | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| African 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 Spear Plant | Medium indirect light (a couple of metres from a window) | When the soil is completely dry, roughly every 2-4 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| African Yellowwood | Bright indirect light (just back from a sunny window) | When the top few cm of soil dry, roughly weekly while establishing | Toxic to pets |
| Afzel's Nephthytis | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Agave attenuata 'Boutin Blue' | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, every 1-2 weeks in summer; sparingly in winter | Toxic to pets |
| Agave bracteosa | Bright indirect light (just back from a sunny window) | When the soil is dry, every 1-2 weeks in summer; sparingly in winter | Toxic to pets |
| Agave havardiana | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Agave isthmensis | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Agave lechuguilla | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and rarely in winter | Toxic to pets |
| Agave macroacantha | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Agave marmorata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer and monthly in winter | Toxic to pets |
| Agave mitis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 2 weeks in summer and monthly in winter | Toxic to pets |
| Agave multifilifera | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Agave nickelsiae | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Agave parryi 'Truncata' | Direct sun (at least 4-6 hours) | When fully dry, every 2-3 weeks in summer; monthly or less in winter | Toxic to pets |
| Agave toumeyana | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; monthly or less in winter | Toxic to pets |
| Agave utahensis | Direct sun (at least 4-6 hours) | When fully dry, every 2-4 weeks in summer; little to none in winter | Toxic to pets |
| Agave vilmoriniana | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 1-2 weeks in summer; sparingly in winter | Toxic to pets |
| Agave xylonacantha | Direct sun (at least 4-6 hours) | When fully dry, every 2-3 weeks in summer; monthly or less in winter | Toxic to pets |
| Agave zebra | Direct sun (at least 4-6 hours) | When fully dry, every 2-4 weeks in summer; little to none in winter | Toxic to pets |
| Ageratum houstonianum 'Artist Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days | Toxic to pets |
| Ageratum houstonianum 'Blue Horizon' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days | Toxic to pets |
| Aglaonema 'Creta' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema 'Emerald Beauty' | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema 'First Diamond' | 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 'Lady Valentine' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema 'Siam Aurora' (Red Chinese Evergreen) | Medium indirect light (a couple of metres from a window) | Every 7-10 days; when the top 1-2 inches of soil are dry | Toxic to pets |
| Aglaonema 'Sparkling Sarah' | 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 (Chinese Evergreen) | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm (1 inch) of compost is dry, roughly every 7-10 days in growth | Toxic to pets |
| Aglaonema Anyamanee | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Burmese Evergreen | 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 |
| Aglaonema Chocolate | 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 |
| Aglaonema Cutlass | 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 |
| Aglaonema Dud Unyamanee | 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 |
| Aglaonema Emerald Bay | Low light (north window or shaded room) | When top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Firecracker | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Gemini | 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 |
| Aglaonema Golden Bay | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Harlequin | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Jubilee Petite | Low light (north window or shaded room) | When top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Legacy | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Malay Beauty | 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 |
| Aglaonema Maria | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Modestum | Low light (north window or shaded room) | When top 3-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Aglaonema nitidum | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Osaka | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Pictum Bicolor | Medium indirect light (a couple of metres from a window) | When top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Aglaonema Pictum Tricolor | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of mix dries out | Toxic to pets |
| Aglaonema Pink Beauty | Medium indirect light (a couple of metres from a window) | When top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Pink Dalmatian | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Prosperity | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Red | 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 |
| Aglaonema Rotundum | Medium indirect light (a couple of metres from a window) | When top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Aglaonema Silver Bay | Low light (north window or shaded room) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Aglaonema Silver Queen | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Spring Snow | 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 |
| Aglaonema Stripes | Low light (north window or shaded room) | When top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Suksom Jaipong | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Super White | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Tigress | Low light (north window or shaded room) | When top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Unyamanee | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema White Rajah | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Aglaonema Widuri | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Aglaonema Wishes | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Albany Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks (allow full dry-down between waterings) | 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 |
| Allioni's Primrose | Bright indirect light (just back from a sunny window) | Moderately during spring and summer; very sparingly in winter | Toxic to pets |
| Allium 'Firmament' | Direct sun (at least 4-6 hours) | Water at planting and during spring growth; keep dry in summer dormancy | Toxic to pets |
| Allium 'Gladiator' | Direct sun (at least 4-6 hours) | Water during spring growth; keep dry in summer dormancy, every 2-3 weeks at most if drought-stressed | Toxic to pets |
| Allium 'Globemaster' | Direct sun (at least 4-6 hours) | Water during spring growth; keep dry through summer dormancy, every 2-3 weeks at most if drought-stressed | Toxic to pets |
| Allium 'Hair' | Direct sun (at least 4-6 hours) | Water at planting then only in prolonged spring drought; keep dry once dormant | Toxic to pets |
| Allium 'Mount Everest' | Direct sun (at least 4-6 hours) | Water in spring growth; keep dry over summer dormancy, every 2-3 weeks at most if very dry | Toxic to pets |
| Allium 'Purple Sensation' | Direct sun (at least 4-6 hours) | Water during active spring growth only; otherwise minimal, every 2-3 weeks if dry | Toxic to pets |
| Allium schubertii | Direct sun (at least 4-6 hours) | Water lightly in spring growth; keep very dry through summer dormancy, rarely if ever in summer | Toxic to pets |
| Alocasia | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 5-7 days | Toxic to pets |
| Alocasia 'Pink Dragon' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 inch) of soil dries out — roughly every 5-7 days in summer, every 10-14 days in winter | Toxic to pets |
| Alocasia Amazonica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days in growth | Toxic to pets |
| Alocasia Amazonica Variegata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia Baginda | Bright indirect light (just back from a sunny window) | When the top half of the mix is dry, about every 6-9 days | Toxic to pets |
| Alocasia Bambino | Bright indirect light (just back from a sunny window) | Every 5-10 days in the growing season; less in winter | Toxic to pets |
| Alocasia Bambino Arrow | Bright indirect light (just back from a sunny window) | When the top 2 cm of mix is dry, roughly every 5-7 days in growth | Toxic to pets |
| Alocasia Black Velvet | Bright indirect light (just back from a sunny window) | When top 2-5cm of soil dries, roughly weekly in summer | Toxic to pets |
| Alocasia Brancifolia | 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 |
| 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 Chantrieri | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia Clypeolata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia 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 Cuprea (Red Secret) | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of soil are dry, roughly 1-2 times weekly in spring and summer | Toxic to pets |
| Alocasia Cuprea Red Secret | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Alocasia Dragon Scale | Bright indirect light (just back from a sunny window) | Roughly every 5-10 days in growth; less in winter | Toxic to pets |
| Alocasia Frydek (Green Velvet) | Bright indirect light (just back from a sunny window) | When the top third of the soil dries; roughly weekly in summer, fortnightly in winter | Toxic to pets |
| Alocasia 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 Heterophylla | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia Heterophylla Spirit | 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 Hilo Beauty | 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 active growth | Toxic to pets |
| Alocasia Imperial Red | 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 |
| Alocasia Infernalis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of medium is dry, roughly every 5-7 days | Toxic to pets |
| Alocasia Ivory Coast | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days in growth | Toxic to pets |
| Alocasia Jacklyn | Bright indirect light (just back from a sunny window) | Roughly every 5-9 days in active growth; less in winter | Toxic to pets |
| Alocasia Lauterbachiana (Purple Sword) | Bright indirect light (just back from a sunny window) | When the top 25-33% of the soil is dry, roughly weekly in summer and less in winter | Toxic to pets |
| Alocasia Longiloba | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia Low Rider | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil dries, about every 5-7 days in summer | Toxic to pets |
| Alocasia Macrorrhizos Giant Upright | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil dries, often every 4-6 days in active growth | Toxic to pets |
| Alocasia Macrorrhizos Variegata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-10 days in growth | Toxic to pets |
| Alocasia Maharani (Grey Dragon) | Bright indirect light (just back from a sunny window) | Roughly every 5-7 days in spring and summer; about every 1-2 weeks in winter | Toxic to pets |
| Alocasia Melo | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of medium is dry, roughly every 5-8 days | Toxic to pets |
| Alocasia Micholitziana | 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 Midrib | 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 |
| Alocasia Morocco | 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 |
| 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 Nebula | 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 |
| 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 Polly | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 5-7 days in summer and every 10-14 days in winter | Toxic to pets |
| Alocasia 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 Princeps | 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 |
| 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 Reginae | 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 Reginula | 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 |
| Alocasia Reversa | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Alocasia Sanderiana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Toxic to pets |
| Alocasia Sarawakensis | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 5-8 days in growth | Toxic to pets |
| Alocasia 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 Scalprum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of medium is dry, roughly every 5-7 days | Toxic to pets |
| Alocasia Serendipity | 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 Silver Dragon | Bright indirect light (just back from a sunny window) | When the top 1-2 cm (about half an inch to an inch) of soil dries out, often every 5-10 days indoors | Toxic to pets |
| Alocasia Sinuata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of medium is dry, roughly every 5-7 days | Toxic to pets |
| Alocasia Stingray | Bright indirect light (just back from a sunny window) | Roughly every 5-9 days in spring and summer; reduce to about every 2-3 weeks in winter. | Toxic to pets |
| Alocasia Sulawesi | 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 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 |
| Alocasia Tandurusa | 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 Tiny Dancer | Bright indirect light (just back from a sunny window) | Every 1-2 weeks | Toxic to pets |
| Alocasia Tiny Dancers | Bright indirect light (just back from a sunny window) | When the top 2 cm of mix is dry, roughly every 4-7 days in growth | Toxic to pets |
| Alocasia Triangularis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Alocasia Wentii (Hardy Elephant Ear) | Bright indirect light (just back from a sunny window) | Roughly every 5-10 days; water when the top 2-3 cm (1 inch) of mix dries | Toxic to pets |
| Alocasia Wollongong | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm of mix is dry, roughly every 5-9 days | Toxic to pets |
| Alocasia Zebrina | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 7-10 days in growth | Toxic to pets |
| Alocasia Zebrina Reticulata | 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 Zebrina Tigrina | 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 |
| Aloe 'Blue Elf' | Direct sun (at least 4-6 hours) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe 'Delta Lights' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe '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 'Firebird' | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe 'Hercules' | Direct sun (at least 4-6 hours) | When the soil is dry, roughly every 1-2 weeks in summer and every 3-4 weeks in winter | Toxic to pets |
| Aloe 'Pink Blush' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Aculeata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Burgersfortensis | Direct sun (at least 4-6 hours) | When the mix has dried out, roughly every 2 weeks in summer | Toxic to pets |
| Aloe Castillon | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in warm growth | Toxic to pets |
| Aloe Comosa | Direct sun (at least 4-6 hours) | Only when bone dry, roughly every 3 weeks in active growth | Toxic to pets |
| Aloe Descoingsii | Bright indirect light (just back from a sunny window) | When the small pot dries out, about every 1-2 weeks in summer | Toxic to pets |
| Aloe Dorotheae | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in growth | Toxic to pets |
| Aloe Erinacea | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 2-3 weeks at most in growth | Toxic to pets |
| Aloe Ferox | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Gariepensis | Direct sun (at least 4-6 hours) | Only when completely dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Globuligemma | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer | Toxic to pets |
| Aloe Greatheadii | Direct sun (at least 4-6 hours) | When the mix is dry, roughly every 2 weeks in summer | Toxic to pets |
| Aloe Haworthioides | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 1-2 weeks in growth | Toxic to pets |
| Aloe Hereroensis | Direct sun (at least 4-6 hours) | When the soil is bone-dry throughout, roughly every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Aloe Humilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Aloe Krapohliana | Direct sun (at least 4-6 hours) | Sparingly when soil is fully dry — roughly every 2-3 weeks in active growth, very little in summer dormancy | Toxic to pets |
| Aloe Linearifolia | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry out — roughly every 1-2 weeks in summer, less in winter | Toxic to pets |
| Aloe 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 Massawana | Direct sun (at least 4-6 hours) | When the top 2-4 cm of soil dries — roughly weekly in warm growth, much less in cool months | Toxic to pets |
| Aloe Microstigma | Direct sun (at least 4-6 hours) | When soil is fully dry, about weekly in peak summer heat | Toxic to pets |
| Aloe Minima | Direct sun (at least 4-6 hours) | When soil is dry, roughly every 2 weeks in growth | Toxic to pets |
| Aloe Mitis | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer | Toxic to pets |
| Aloe Peglerae | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe Petricola | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer | Toxic to pets |
| Aloe Pluridens | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 1-2 weeks in summer for an established plant | Toxic to pets |
| Aloe Rauhii | Bright indirect light (just back from a sunny window) | When soil is dry, roughly every 2 weeks in growth | Toxic to pets |
| Aloe Reitzii | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and once a month or less in winter | Toxic to pets |
| Aloe Rubroviolacea | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Aloe Secundiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer and once a month in winter | Toxic to pets |
| Aloe Speciosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Aloe Suzannae | Direct sun (at least 4-6 hours) | When the soil is dry, roughly every 2 weeks in warm growth and monthly in cool weather | Toxic to pets |
| Aloe Thraskii | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in summer and monthly in winter | Toxic to pets |
| Aloe Tomentosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Toxic to pets |
| Aloe Vanbalenii | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in summer and monthly in winter | Toxic to pets |
| Aloe vera | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| Aloe Vera 'Chinese' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of mix is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Aloe Wickensii | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 2-3 weeks in the growing season | Toxic to pets |
| Alpine Clematis | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in the growing season | Toxic to pets |
| Alpine Squill | Medium indirect light (a couple of metres from a window) | Water during growth; dry during summer dormancy | Toxic to pets |
| Alpine Totara | Direct sun (at least 4-6 hours) | When the top few cm of soil dry out, roughly weekly while establishing | Toxic to pets |
| Amaryllis | Bright indirect light (just back from a sunny window) | Sparingly until growth appears, then keep evenly moist | Toxic to pets |
| Amaryllis 'Apple Blossom' | Bright indirect light (just back from a sunny window) | Sparingly until growth starts, then when top 2-3 cm of soil is dry | Toxic to pets |
| Amaryllis 'Christmas Gift' | Bright indirect light (just back from a sunny window) | Sparingly until growth starts, then when top 2-3 cm of soil is dry | Toxic to pets |
| Amaryllis 'Minerva' | Bright indirect light (just back from a sunny window) | Sparingly until growth starts, then when top 2-3 cm of soil is dry | Toxic to pets |
| Amaryllis 'Papilio' | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Amaryllis 'Picotee' | Bright indirect light (just back from a sunny window) | Sparingly until growth starts, then when top 2-3 cm of soil is dry | Toxic to pets |
| Amaryllis 'Red Lion' | Bright indirect light (just back from a sunny window) | Sparingly until growth starts, then when top 2-3 cm of soil is dry | Toxic to pets |
| 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 Holly | Bright indirect light (just back from a sunny window) | Weekly while establishing, then during dry spells | Toxic to pets |
| American Turk's Cap Lily | Bright indirect light (just back from a sunny window) | Twice weekly; more in dry periods | Toxic to pets |
| American wisteria | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once mature | Toxic to pets |
| American Wood Anemone | Medium indirect light (a couple of metres from a window) | Weekly during active spring growth; none during summer dormancy | Toxic to pets |
| Amorphophallus abyssinicus | Bright indirect light (just back from a sunny window) | Keep evenly moist during active leaf growth, watering when the top 2-3 cm of soil dries; withhold water once the leaf yellows and the tuber goes dormant. | Toxic to pets |
| Amorphophallus decus-silvae | Bright indirect light (just back from a sunny window) | Keep evenly moist and never bone-dry in active growth; withhold once the leaf dies back for dormancy | Toxic to pets |
| Amorphophallus hewittii | Bright indirect light (just back from a sunny window) | Keep the soil consistently moist during active leaf growth; taper off sharply once the leaf yellows so the dormant tuber stays barely moist to dry. | Toxic to pets |
| Amorphophallus maximus | Bright indirect light (just back from a sunny window) | Keep evenly moist in active growth, letting the surface dry slightly; withhold once the leaf dies back | Toxic to pets |
| Amorphophallus prainii | Bright indirect light (just back from a sunny window) | Keep evenly moist while the leaf is active; withhold almost entirely once it dies back for dormancy | Toxic to pets |
| Amorphophallus variabilis | Bright indirect light (just back from a sunny window) | Keep evenly moist while in leaf, watering when the top 2-3 cm of soil dries; keep the dormant corm nearly dry | Toxic to pets |
| Amydrium Hainanense | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Amydrium medium | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Amydrium Medium Silver | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; water when the top ~25% of the mix is dry | Toxic to pets |
| Amydrium zippelianum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Anadendrum Michaelii | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Anemone × hybrida 'Honorine Jobert' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply weekly in dry spells, more in its first year | Toxic to pets |
| Anemone × hybrida 'Königin Charlotte' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply once a week in dry weather, more while establishing | Toxic to pets |
| Anemone × hybrida 'Pamina' | Bright indirect light (just back from a sunny window) | Keep evenly moist; deep weekly watering in dry weather, more while establishing | Toxic to pets |
| Anemone × hybrida 'September Charm' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry; keep evenly moist, especially while establishing | Toxic to pets |
| Anemone coronaria 'Hollandia' | Direct sun (at least 4-6 hours) | Keep soil evenly moist during active growth and flowering; every 5-7 days if no rain | Toxic to pets |
| Anemone coronaria 'Meron Violet' | Direct sun (at least 4-6 hours) | Keep soil evenly moist during active growth and flowering; reduce as foliage yellows toward dormancy | Toxic to pets |
| Anemone coronaria 'Mr. Fokker' | Direct sun (at least 4-6 hours) | Keep soil evenly moist through growth and flowering; reduce as foliage yellows toward dormancy | Toxic to pets |
| Anemone coronaria 'The Bride' | Direct sun (at least 4-6 hours) | Keep soil evenly moist through growth and flowering; reduce as foliage yellows toward dormancy | Toxic to pets |
| Anemone hupehensis 'Hadspen Abundance' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply weekly in dry spells and more during establishment | Toxic to pets |
| Angel Wing Begonia | Bright indirect light (just back from a sunny window) | When the top 1-2 inches (2.5-5 cm) of soil feel dry | Toxic to pets |
| Angel Wing Begonia 'Lucerna' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Angel Wing Begonia 'Lucerna' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Angel's Tears Daffodil | Direct sun (at least 4-6 hours) | Low; water during active growth, dry summer dormancy | Toxic to pets |
| Angel's Tears Daffodil | Direct sun (at least 4-6 hours) | Once per week during active spring growth; dry dormancy required in summer | Toxic to pets |
| Angel's Tears Narcissus | Direct sun (at least 4-6 hours) | Moderate during growth; dry during summer dormancy | 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 |
| Angelique Double Tulip | Direct sun (at least 4-6 hours) | Water at planting; minimal supplemental irrigation during growth; dry during dormancy | Toxic to pets |
| Angola Culcasia | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Anthurium | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, every 5-7 days | Toxic to pets |
| Anthurium 'Ace of Spades' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of the mix is dry, roughly every 5-9 days | Toxic to pets |
| Anthurium 'Black Love' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium 'Black Queen' | 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 |
| Anthurium 'Livium' | 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 'Pterodactyl' | Bright indirect light (just back from a sunny window) | Roughly weekly; water when the top 2-5cm (top half) of the mix has dried | Toxic to pets |
| Anthurium amnicola | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Anthurium andraeanum 'Acropolis' | 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 'Alabama' | 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 'Baby Pink' | 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 |
| Anthurium andraeanum 'Baron' | 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 'Bianco' | 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 'Black Beauty' | 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 'Cheers' | 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 '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 'Fantasia' | 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 'Fantasy Love' | 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 'Florida' | 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 'Kozohara' | 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 'Kozue' | 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 'Lila' | 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 'Midori' | 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 'Orange Hot' | 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 |
| Anthurium andraeanum 'Pacora' | 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 'Pierrot' | 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 'Purple Victory' | 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 'Roseum' | 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 'Roxane' | 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 'Roxanne' | 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 |
| Anthurium andraeanum 'Rubrum' | 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 'Shooting Star' | 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 andraeanum 'Tropic Sunset' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Toxic to pets |
| Anthurium andraeanum 'Tropical' | 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 Andreanum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Anthurium andreanum 'Sonate' | 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 Angamarcanum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is approaching dry, often every 5-7 days | Toxic to pets |
| Anthurium arisaemoides | Bright indirect light (just back from a sunny window) | When the top 2 cm of mix begins to dry, about every 4-7 days | Toxic to pets |
| Anthurium bakeri | 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 berriozabalense | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Anthurium besseae aff. (Dark Velvet) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is just dry | Toxic to pets |
| Anthurium brownii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-8 days | Toxic to pets |
| Anthurium Chamberlainii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-9 days | Toxic to pets |
| Anthurium clarinervium (Velvet Cardboard Anthurium) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 5-7 days in summer and every 10-14 days in winter | Toxic to pets |
| Anthurium Clarinervium × 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 clidemioides | Bright indirect light (just back from a sunny window) | When the surface substrate begins to dry, about every 3-6 days | Toxic to pets |
| Anthurium consobrinum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Anthurium Coriaceum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Anthurium corrugatum | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of mix dries, about every 5-9 days | Toxic to pets |
| Anthurium crystallinum x magnificum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Anthurium cutucuense | Bright indirect light (just back from a sunny window) | When the surface of the mix begins to dry, roughly every 4-8 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 debile | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of mix is just dry, about every 5-8 days | Toxic to pets |
| Anthurium digynum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Anthurium dolichostachyum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-8 days | Toxic to pets |
| Anthurium Dorayaki | 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 eminens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is just dry, roughly every 5-7 days | Toxic to pets |
| Anthurium faustomirandae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 6-9 days | Toxic to pets |
| Anthurium gracile | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 6-9 days | Toxic to pets |
| Anthurium jenmanii | 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 |
| Anthurium Kunthii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-9 days | Toxic to pets |
| Anthurium lancifolium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Anthurium leuconeurum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-8 days | Toxic to pets |
| Anthurium Magnificum | Bright indirect light (just back from a sunny window) | When the top 2 to 3 cm of mix is dry, roughly weekly | Toxic to pets |
| Anthurium 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 marmoratum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is just dry, roughly every 5-7 days | Toxic to pets |
| Anthurium metallicum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Anthurium microspadix | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 6-8 days | Toxic to pets |
| Anthurium Nigrolaminum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is approaching dry, often every 5-7 days | Toxic to pets |
| Anthurium nymphaeifolium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium ochranthum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-8 days | Toxic to pets |
| Anthurium ovatifolium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium 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 pentaphyllum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium plowmanii | 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 |
| Anthurium podophyllum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium polyschistum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium queremalense | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-8 days | Toxic to pets |
| Anthurium radicans | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of substrate dries, about every 4-8 days | Toxic to pets |
| Anthurium radicans x dressleri | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of substrate dries, about every 4-8 days | Toxic to pets |
| Anthurium Ravenii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-9 days | Toxic to pets |
| Anthurium recavum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 6-8 days | Toxic to pets |
| Anthurium Reflexinervium | 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 Rotundistigma | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Anthurium Salgarense | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Anthurium salvinii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 6-9 days | Toxic to pets |
| Anthurium scandens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium scherzerianum 'Rothschildianum' | Bright indirect light (just back from a sunny window) | When the top 2 cm of mix is dry, roughly every 7-10 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 |
| Anthurium Timbuiquense | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix begins to dry, often every 5-7 days | Toxic to pets |
| Anthurium Warocqueanum × Andreanum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is just dry, roughly every 5-8 days | Toxic to pets |
| Anthurium watermaliense | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 5-7 days | Toxic to pets |
| Anthurium x 'Ace of Spades' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Anthurium x 'Dark Mama' | 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 |
| Anthurium x 'Vittarifolium Hybrid' | Bright indirect light (just back from a sunny window) | When the surface of the mix begins to dry, roughly every 4-6 days | Toxic to pets |
| Apennine Windflower | Medium indirect light (a couple of metres from a window) | Rainfall usually sufficient in woodland settings; water once per week only during dry springs | Toxic to pets |
| Arabian Desert Rose | Direct sun (at least 4-6 hours) | Every 7–14 days in active growth (spring–summer); minimal in winter dormancy | Toxic to pets |
| Arborvitae | Direct sun (at least 4-6 hours) | Deeply once or twice a week for the first 1-2 growing seasons, then mainly in droughts | Toxic to pets |
| Arid Mountain Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (autumn–spring); none in summer | Toxic to pets |
| Arisaema consanguineum | Medium indirect light (a couple of metres from a window) | Keep evenly moist during growth, about every 4-7 days; ease off as it dies back | Toxic to pets |
| Arisaema elephas | Medium indirect light (a couple of metres from a window) | Keep evenly moist during growth, about every 4-7 days; reduce as it dies back | Toxic to pets |
| Arisaema flavum | Medium indirect light (a couple of metres from a window) | Keep evenly moist during active growth (spring to late summer); withhold once dormant | Toxic to pets |
| Arisaema griffithii | Medium indirect light (a couple of metres from a window) | Keep evenly moist through growth, roughly every 4-7 days; reduce sharply once foliage yellows | Toxic to pets |
| Arisaema jacquemontii | Bright indirect light (just back from a sunny window) | Keep evenly moist in spring and summer growth; allow to dry as the leaf dies back in late summer | Toxic to pets |
| Arisaema nepenthoides | Bright indirect light (just back from a sunny window) | Keep evenly moist in spring and summer; let it dry as the leaf dies back in late summer | Toxic to pets |
| Arisaema ringens | Medium indirect light (a couple of metres from a window) | Keep evenly moist during growth, about every 4-7 days; reduce as it dies back | Toxic to pets |
| Arisaema serratum | Bright indirect light (just back from a sunny window) | Keep evenly moist through spring and summer; allow drying as the leaf dies back in autumn | Toxic to pets |
| Arisaema speciosum | Medium indirect light (a couple of metres from a window) | Keep evenly moist through growth, about every 4-7 days; reduce as it dies back | Toxic to pets |
| 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 |
| Arrow Arum | Bright indirect light (just back from a sunny window) | Permanent shallow flooding — plant in up to 15 cm of water | 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 |
| Arroyo Lupine | Direct sun (at least 4-6 hours) | Low once established; rely on winter rainfall; supplement lightly in February–March during dry years | Toxic to pets |
| Arum italicum | Medium indirect light (a couple of metres from a window) | Keep evenly moist in active growth (autumn to spring); reduce sharply during summer dormancy | Toxic to pets |
| Arum Lily | Bright indirect light (just back from a sunny window) | Regularly moist to wet — water every 2–3 days or plant in standing water | Toxic to pets |
| Ashy Broom | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Toxic to pets |
| Asparagus fern | 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 |
| Asparagus Fern 'Sprengeri' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Atlantic Wild Indigo | Direct sun (at least 4-6 hours) | Low once established; water weekly in the first season | Toxic to pets |
| Atlas Poppy | Direct sun (at least 4-6 hours) | Once a week in dry spells during active growth; largely drought-tolerant once established | Toxic to pets |
| Audrey Fig | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Augustine's rhododendron | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; reduce in winter | Toxic to pets |
| Auricula | Bright indirect light (just back from a sunny window) | Moderately in spring and summer; reduce significantly in autumn and winter | 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 Cycad | Bright indirect light (just back from a sunny window) | Every 14–21 days in summer; very sparingly in winter | Toxic to pets |
| Australian Foxtail Cycad | Direct sun (at least 4-6 hours) | When the top 5 cm of mix is dry, roughly every 12-16 days in growth | Toxic to pets |
| Autumn Arum | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry during autumn-winter growing season; minimal in summer dormancy | Toxic to pets |
| Autumn Crocus | Bright indirect light (just back from a sunny window) | Relies on natural rainfall; rarely needs supplementary watering | Toxic to pets |
| Autumn Daffodil | Direct sun (at least 4-6 hours) | Moderate during autumn and spring growth; dry during summer dormancy | Toxic to pets |
| Autumn Gold Maidenhair Tree | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days when young | Toxic to pets |
| Autumn Pineapple Lily | Direct sun (at least 4-6 hours) | Moderate during growth; reduce after foliage dies back | Toxic to pets |
| Autumn Pineapple Lily | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days during the growing season | Toxic to pets |
| Autumn Squill | Direct sun (at least 4-6 hours) | Very sparingly; allow soil to dry completely between waterings, roughly every 14-21 days in active season | Toxic to pets |
| Azalea 'Firefly' | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 7-10 days during the growing season | Toxic to pets |
| Azalea 'Gibraltar' | Bright indirect light (just back from a sunny window) | Deeply once or twice a week in dry weather; keep consistently moist year-round | Toxic to pets |
| Azalea 'Hino-Crimson' | Bright indirect light (just back from a sunny window) | Deeply once a week; increase in hot, dry spells | Toxic to pets |
| Azalea 'Weston's Flamingo' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly every 5-7 days in summer; reduce in winter | Toxic to pets |
| Aztec Lily | Direct sun (at least 4-6 hours) | Regular watering while in active growth; keep dry during autumn–winter dormancy | Toxic to pets |
| Bacon Avocado | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, roughly every 5-7 days in warm growth | Toxic to pets |
| Baines' Cyphostemma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Toxic to pets |
| Baker's Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| Balao Anthurium | Bright indirect light (just back from a sunny window) | When the top 15-20% of the mix dries out | Toxic to pets |
| Balearic box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Baltic Blue Pothos | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days; let the top 1-2 inches (2.5-5 cm) of soil dry out first | Toxic to pets |
| Banana Croton | Bright indirect light (just back from a sunny window) | When the top 1-2.5 cm (half to one inch) of compost is dry, roughly every 7-10 days in summer | Toxic to pets |
| Baptisia 'Purple Smoke' | Direct sun (at least 4-6 hours) | Weekly the first season; minimal once established | Toxic to pets |
| Baron's Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; none from late autumn to mid-spring | Toxic to pets |
| Barter's Cycad | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 4–6 weeks in winter | Toxic to pets |
| Baseball Plant | Bright indirect light (just back from a sunny window) | Every 3-4 weeks in spring/summer; roughly every 6-8 weeks (or less) in winter | 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 |
| Bastard Cobas | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once every 4–6 weeks or less in winter | Toxic to pets |
| Batalin's Tulip | Direct sun (at least 4-6 hours) | Light to moderate in spring; completely dry in summer | Toxic to pets |
| Beaked Homalomena | Low light (north window or shaded room) | Every 7–14 days; reduce in winter | Toxic to pets |
| Bear Paw | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; roughly every 2-3 weeks in winter | Toxic to pets |
| Bedding Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 3-5 days | Toxic to pets |
| Beefsteak Begonia | Bright indirect light (just back from a sunny window) | Roughly weekly in summer; every 10-14 days in winter | Toxic to pets |
| Begonia | Bright indirect light (just back from a sunny window) | Weekly watering | Toxic to pets |
| Begonia 'Barkos' | 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 |
| Begonia 'Benitochiba' | 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 'Benitoma' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-10 days | Toxic to pets |
| Begonia 'Black Coffee' | 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 |
| Begonia 'Black Fang' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-10 days | Toxic to pets |
| Begonia 'Black Mamba' | 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 'Black Velvet' | 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 '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 'Braveheart' | 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 |
| 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 'Charm' | 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 |
| 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 'Connee Boswell' | 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 '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 'Corbeille de Feu' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 3-6 days in summer 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 'Cracklin' Rosie' | Bright indirect light (just back from a sunny window) | When the top 1-2 inches (3-5 cm) of soil are dry | Toxic to pets |
| Begonia 'Curly Fireflush' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-7 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 'Duartei' | 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 |
| 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 'Escargot' Cocktail Series | 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 'Fedor' | 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 |
| 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 'Fireworks' | 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 '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 'Fragrant Beauty' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days in growth | Toxic to pets |
| Begonia 'Glowing Embers' | 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 '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 'Guy Savard' | Bright indirect light (just back from a sunny window) | When the top 2 cm of mix is dry, roughly every 4-6 days | Toxic to pets |
| Begonia 'Harmony's Red Robin' | 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 'Helen Teupel' | 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 |
| Begonia 'Illumination Orange' | 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 'Illumination Salmon' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 3-6 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 'It' | 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 |
| Begonia 'Joe Hayden' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-8 days | Toxic to pets |
| Begonia 'Jurassic Bewitched' | 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 '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 'Jurassic Watermelon' | 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 'Lana' | 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 'Looking Glass' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 5-7 days in growth | Toxic to pets |
| Begonia 'Lucerna' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Begonia 'Maori Haze' | Bright indirect light (just back from a sunny window) | When the top 2-3cm of soil is dry (roughly weekly in summer, less in winter) | Toxic to pets |
| Begonia 'Marmaduke' | 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 'Martin's Mystery' | 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 'Maurice Amey' | 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 'Merry Christmas' | 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 |
| Begonia 'Midnight Magic' | 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 |
| Begonia 'Midnight Twist' | 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 'Non-Stop Rose' | 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 'Nonstop Joy Salmon' | 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 'Nonstop Joy White' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia 'Nonstop Red' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia 'Nonstop Rose Petticoat' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia 'Norah Bedson' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-8 days | Toxic to pets |
| Begonia 'Northern Lights' | 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 'Palomar Prince' | 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 'Passing Storm' | 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 'Picotee Lace Pink' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia 'Pin Up Flame' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia 'Potpourri' | 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 'Red Robin' | 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 'River Nile' | 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 'Sachsen' | 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 '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 'Selph's Mahogany' | 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 |
| Begonia 'Senator White' | 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 |
| Begonia 'Shamus' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-8 days | Toxic to pets |
| Begonia 'Silver Jewel' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 5-7 days in growth | Toxic to pets |
| Begonia 'Silver Limbo' | 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 |
| Begonia 'Silver Limbo' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-9 days | 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 'Sophie' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Begonia 'Stained Glass' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, 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 'Tiger Paws' | 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 'Tiny Gem' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, about every 5-7 days | Toxic to pets |
| Begonia 'Tom Ment' | 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 '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 'U491' | 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 'Varsity Red' | 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 |
| Begonia 'Wightii' | 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 'Withlacoochee' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-8 days | Toxic to pets |
| Begonia 'Zip Code' | 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 |
| Begonia 'Zip' | 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 |
| 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 'Cocktail Vodka' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 3-5 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 × tuberhybrida 'Non-Stop Mocca White' | 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 growth | Toxic to pets |
| Begonia × tuberhybrida 'Nonstop Rose' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is just dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia × tuberhybrida 'Pin-Up Flame' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is just dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia aconitifolia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days | Toxic to pets |
| Begonia albopicta | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Begonia Amphioxus | Bright indirect light (just back from a sunny window) | Keep lightly and evenly moist; water when the top of the substrate begins to dry | Toxic to pets |
| Begonia carolineifolia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-10 days in growth | Toxic to pets |
| Begonia chlorosticta | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of mix is just dry, roughly every 4-7 days | Toxic to pets |
| Begonia conchifolia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Begonia convolvulacea | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Begonia dichroa | 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 dregei | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Begonia ferox | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of substrate is dry, roughly every 4-7 days | Toxic to pets |
| Begonia foliosa | 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 gehrtii | 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 goegoensis | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of mix is dry, roughly every 4-7 days | Toxic to pets |
| Begonia grandis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly weekly in active growth | Toxic to pets |
| Begonia grandis subsp. evansiana | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist in summer; water during dry spells, roughly weekly in heat | Toxic to pets |
| Begonia hatacoa | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is just dry, roughly every 4-6 days | 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 imperialis | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Begonia incarnata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 5-7 days in growth | Toxic to pets |
| Begonia manicata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Begonia mazae | 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 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 microsperma | Bright indirect light (just back from a sunny window) | When the top 2 cm of mix is just drying, roughly every 4-6 days | Toxic to pets |
| Begonia nelumbifolia 'Marmorata' | 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 nelumbiifolia | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of mix is dry, roughly every 5-9 days | Toxic to pets |
| Begonia odorata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 4-7 days in growth | Toxic to pets |
| Begonia partita | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-12 days | Toxic to pets |
| Begonia pavonina | Low light (north window or shaded room) | Keep soil consistently lightly moist, never dry and never soggy | Toxic to pets |
| Begonia peltata | 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 prismatocarpa | Medium indirect light (a couple of metres from a window) | Keep the medium consistently moist; check every 3-5 days | Toxic to pets |
| Begonia pustulata | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days in growth | Toxic to pets |
| Begonia reniformis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Begonia scharffii | 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 schmidtiana | 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 |
| 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 |
| Begonia solananthera | 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 stipulacea | 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 |
| Begonia subvillosa | 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 |
| Begonia sutherlandii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, every few days in summer | Toxic to pets |
| Begonia U-377 | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, often every 4-6 days | Toxic to pets |
| Bell Cotyledon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 5–6 weeks in winter | Toxic to pets |
| Belladonna larkspur | Direct sun (at least 4-6 hours) | Regular — deep water 2–3 times per week during growth; ease off in wet periods | Toxic to pets |
| Belladonna Lily | Direct sun (at least 4-6 hours) | Minimal or none in summer dormancy; regular from flower emergence through winter while foliage is active; reduce in late spring | Toxic to pets |
| Bent Enkianthus | Bright indirect light (just back from a sunny window) | Regular — keep consistently moist | Toxic to pets |
| Berlandier's Jatropha | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Toxic to pets |
| Beuvron Dwarf Scots Pine | Direct sun (at least 4-6 hours) | Every 10–14 days in summer during the first 3 years; largely self-sufficient once established | Toxic to pets |
| Big Blue Lilyturf | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| 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 |
| Bilimbi | Direct sun (at least 4-6 hours) | Every 3-7 days, keeping soil consistently moist; bilimbi dislikes drying out | Toxic to pets |
| Bird of paradise | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Bird-in-a-bush | Medium indirect light (a couple of metres from a window) | Moderate in spring during active growth; dry during summer dormancy | Toxic to pets |
| Bird's Nest Anthurium | 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 |
| Black Calla Lily | Bright indirect light (just back from a sunny window) | Generously during active growth; taper off as foliage dies back; bone dry in dormancy | Toxic to pets |
| Black Fang Begonia | Medium indirect light (a couple of metres from a window) | Every 10–14 days; allow top 2–3 cm to dry | Toxic to pets |
| Black Knight 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 Velvet Anthurium | Bright indirect light (just back from a sunny window) | Every 5-10 days; let the top 2-3 cm (1 inch) dry first | Toxic to pets |
| Bladder Cherry | Direct sun (at least 4-6 hours) | Weekly in the first season; established plants tolerate moderate drought | Toxic to pets |
| Bleeding Heart | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry; roughly weekly, keeping soil consistently moist in spring | Toxic to pets |
| Bleeding Heart | Medium indirect light (a couple of metres from a window) | Every 5–7 days in spring; taper off as foliage yellows; minimal when dormant | Toxic to pets |
| Bloodroot | Medium indirect light (a couple of metres from a window) | Every 5–7 days during spring growth; minimal or none during summer dormancy | Toxic to pets |
| Blue Chalk Sticks | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; every 4–6 weeks in winter | Toxic to pets |
| Blue Chalk Sticks | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 12-18 days in growth | Toxic to pets |
| Blue Chalksticks | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 4–6 weeks in winter | Toxic to pets |
| Blue Chalksticks | Direct sun (at least 4-6 hours) | Roughly every 2-3 weeks in spring and summer; about once a month or less in winter. | Toxic to pets |
| Blue Cohosh | Low light (north window or shaded room) | Every 5–7 days; maintain consistently moist soil | Toxic to pets |
| Blue Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks | Toxic to pets |
| Blue Cycas | Bright indirect light (just back from a sunny window) | Water when the top 3-5 cm of soil is dry, about every 1-2 weeks | Toxic to pets |
| Blue dawn flower | Direct sun (at least 4-6 hours) | Once or twice weekly during dry periods; established plants are relatively drought-tolerant | Toxic to pets |
| Blue Holly 'Blue Princess' | Bright indirect light (just back from a sunny window) | Weekly while establishing, then during dry spells | Toxic to pets |
| Blue Hosta 'Halcyon' | 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 | Toxic to pets |
| Blue Ice bog rosemary | Bright indirect light (just back from a sunny window) | Consistently moist; never allow to dry out | 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 Mouse Ears Hosta | Low light (north window or shaded room) | Keep soil consistently moist, watering when the top 2-3 cm begins to dry, often weekly or more in summer | Toxic to pets |
| Blue Passion Flower | Direct sun (at least 4-6 hours) | Water thoroughly when the top 3-5 cm of soil is dry, roughly every 7-10 days; more frequently in hot summers, reduce significantly in winter | Toxic to pets |
| Blue Potato Bush | Direct sun (at least 4-6 hours) | Every 4-6 days in summer, every 10-14 days in cooler months | Toxic to pets |
| Blue Prince Holly | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 7-10 days in dry spells | Toxic to pets |
| Blue Princess Holly | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 7-10 days in dry spells | Toxic to pets |
| Blue Star Juniper | Direct sun (at least 4-6 hours) | Water through the first season; afterward only in prolonged dry spells | Toxic to pets |
| Blue Surprise Cypress | Direct sun (at least 4-6 hours) | Keep evenly moist; deep weekly watering while establishing, then in dry periods | Toxic to pets |
| Blue Tulp | Direct sun (at least 4-6 hours) | Water sparingly in autumn and winter when growing; completely dry in summer | 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 Water Lily | Direct sun (at least 4-6 hours) | Aquatic — submerged in warm still water permanently | Toxic to pets |
| Blue-green Adenia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; withhold entirely in winter dormancy | Toxic to pets |
| Blume's Typhonium | Bright indirect light (just back from a sunny window) | Moderate when in growth; withhold completely in dormancy | Toxic to pets |
| Blunt-leaf Zamia | Bright indirect light (just back from a sunny window) | Every 10–14 days; reduce to monthly in cooler or drier months | Toxic to pets |
| Blushing Arisaema | Medium indirect light (a couple of metres from a window) | Regularly during growing season; minimal in dormancy | Toxic to pets |
| Bog Arum | Medium indirect light (a couple of metres from a window) | Saturated soil or up to 15 cm of standing water | Toxic to pets |
| Bog Laurel | Bright indirect light (just back from a sunny window) | Frequent; keep soil consistently moist to wet | Toxic to pets |
| Bog rosemary | Bright indirect light (just back from a sunny window) | Consistently moist; never allow to dry out | Toxic to pets |
| Bogner's Bucephalandra | Medium indirect light (a couple of metres from a window) | Keep substrate or media consistently moist; do not allow to dry out between waterings | Toxic to pets |
| Bokhara Iris | Direct sun (at least 4-6 hours) | Moderate in spring; completely dry from midsummer to autumn | Toxic to pets |
| Bolivian Zamia | Bright indirect light (just back from a sunny window) | Every 7–14 days; reduce to every 21 days in cooler months | Toxic to pets |
| Boliviensis Begonia | 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 |
| Bonsai Pachypodium | Direct sun (at least 4-6 hours) | Every 14–21 days in summer; none or barely any in winter dormancy | Toxic to pets |
| Botterboom | Direct sun (at least 4-6 hours) | Every 2–3 weeks in winter–spring (active), essentially none in summer (dormant) | Toxic to pets |
| Bowden Lily | Direct sun (at least 4-6 hours) | Minimal in summer; moderate from flowering through winter and spring while foliage is present; none once foliage dies back | Toxic to pets |
| Bowman's Dieffenbachia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 8-12 days | Toxic to pets |
| Bracted Begonia | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry | Toxic to pets |
| Brade's Begonia | Medium indirect light (a couple of metres from a window) | When the top 1–2 cm of soil feels dry | Toxic to pets |
| Bread Tree Cycad | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days in growth | Toxic to pets |
| Breadtree | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; every 4–6 weeks in winter | Toxic to pets |
| Bridal Bouquet Plumeria | Direct sun (at least 4-6 hours) | Every 7–10 days in active growth; reduce to every 3–4 weeks in cooler months | Toxic to pets |
| Broad-leaf Horncone | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in the growing season; every 3–4 weeks in winter | Toxic to pets |
| Broad-leaved Grape Hyacinth | Direct sun (at least 4-6 hours) | Once per week during active spring growth; allow to dry out during summer dormancy | Toxic to pets |
| Broad-Leaved Grape Hyacinth | Bright indirect light (just back from a sunny window) | Low once established; moderate during active growth | Toxic to pets |
| Broad-Leaved Primrose | Medium indirect light (a couple of metres from a window) | Regularly throughout the growing season; reduced in winter | Toxic to pets |
| Bucephalandra 'Brownie Ghost' | Low light (north window or shaded room) | Continuously submerged; 20-30% aquarium water change weekly | Toxic to pets |
| Bucephalandra Black Pearl | Low light (north window or shaded room) | Kept permanently wet or submerged; mist daily if emersed | Toxic to pets |
| Bucephalandra Brownie Miami | Medium indirect light (a couple of metres from a window) | Kept submerged in an aquarium, or rhizome misted daily in an emersed setup | Toxic to pets |
| Bucephalandra Kedagang | Medium indirect light (a couple of metres from a window) | Kept submerged in an aquarium, or rhizome misted daily in an emersed setup | Toxic to pets |
| Bucephalandra Sekadau | Low light (north window or shaded room) | Kept constantly wet or submerged; mist daily if emersed | Toxic to pets |
| Bucephalandra Theia Green | Medium indirect light (a couple of metres from a window) | Kept submerged in an aquarium, or rhizome misted daily in an emersed setup | Toxic to pets |
| Bucephalandra Wavy Green | Low light (north window or shaded room) | Kept constantly wet or submerged; mist daily if grown emersed | Toxic to pets |
| Buchholz's Tylecodon | Bright indirect light (just back from a sunny window) | Every 10–14 days when actively growing (autumn–spring); once per month or less in summer | Toxic to pets |
| Buddha's Hand Citron | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, typically every 5-10 days | Toxic to pets |
| Buddha's Temple | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth; minimal in winter | Toxic to pets |
| Buddhist Pine | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Bulbifer Voodoo Lily | Bright indirect light (just back from a sunny window) | Keep evenly moist while in leaf; keep the corm dry through dormancy | Toxic to pets |
| Bulbous Buttercup | Direct sun (at least 4-6 hours) | Once weekly or less; drought-tolerant once established | Toxic to pets |
| Bulbous Corydalis | Medium indirect light (a couple of metres from a window) | Rely on natural rainfall during spring growth; no irrigation needed once dormant in summer | Toxic to pets |
| Bunch-flowered Narcissus | Bright indirect light (just back from a sunny window) | Moderate and consistent during active growth; reduce sharply as foliage yellows; dormant dry | 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 |
| Burrawang | Medium indirect light (a couple of metres from a window) | Water every 2–3 weeks in growing season, monthly or less in winter | Toxic to pets |
| Burrawang Palm | Bright indirect light (just back from a sunny window) | Every 2–3 weeks | Toxic to pets |
| Bush Allamanda | Direct sun (at least 4-6 hours) | Every 5–7 days in the growing season; reduce to every 10–14 days in winter | Toxic to pets |
| Bush Cycad | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; monthly or less in winter | Toxic to pets |
| Butterfly Gladiolus | Direct sun (at least 4-6 hours) | Regular during active growth (summer–autumn); reduce as foliage dies; dry rest in winter | Toxic to pets |
| Butterfly Weed | Direct sun (at least 4-6 hours) | Water to establish, then only during prolonged drought; mature plants rarely need watering | Toxic to pets |
| Byfield Fern Cycad | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks | Toxic to pets |
| Byzantine Colchicum | Bright indirect light (just back from a sunny window) | Relies on natural rainfall; do not water during summer dormancy | Toxic to pets |
| Byzantine Gladiolus | Direct sun (at least 4-6 hours) | Moderate during spring growth; minimal in summer after dormancy | Toxic to pets |
| 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 |
| Cacao | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the surface just begins to dry, often 2-3 times weekly | Toxic to pets |
| Caladium | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, every 4-7 days | Toxic to pets |
| Caladium 'Carolyn Whorton' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 4-6 days in active growth | Toxic to pets |
| Caladium 'Fannie Munson' | Bright indirect light (just back from a sunny window) | Keep consistently moist during active growth; stop watering as leaves die back for dormancy | Toxic to pets |
| Caladium 'Florida Sweetheart' | 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 |
| Caladium 'Puppy Love' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 4-6 days in active growth | Toxic to pets |
| 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 |
| Caladium 'Thai Beauty' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 4-6 days in active growth | Toxic to pets |
| Caladium 'White Queen' | Bright indirect light (just back from a sunny window) | Keep evenly moist while in leaf, watering when the top 2 cm is dry (often every 4-7 days) | Toxic to pets |
| Caladium Aaron | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth, roughly every 3-5 days | Toxic to pets |
| Caladium Candidum | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil begins to dry, roughly every 4-6 days in active growth | Toxic to pets |
| Caladium Florida Cardinal | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry during active growth, often every 4-7 days | Toxic to pets |
| Caladium Florida Elise | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil begins to dry, roughly every 4-6 days in active growth | Toxic to pets |
| Caladium Freida Hemple | 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 | Toxic to pets |
| Caladium Gingerland | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth, roughly every 3-5 days | Toxic to pets |
| Caladium lindenii | 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 |
| Caladium Miss Muffet | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth, roughly every 3-5 days | Toxic to pets |
| Caladium Moonlight | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil begins to dry, roughly every 4-6 days in active growth | Toxic to pets |
| Caladium Pink Cloud | 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 active growth | Toxic to pets |
| Caladium Postman Joyner | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth, roughly every 3-5 days | Toxic to pets |
| Caladium Strawberry Star | 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 active growth | Toxic to pets |
| Caladium White Christmas | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil begins to dry, roughly every 4-6 days in active growth | Toxic to pets |
| Calico flower | Medium indirect light (a couple of metres from a window) | Once or twice a week during the growing season; once a week or less in winter. | Toxic to pets |
| Califano's Dioon | Direct sun (at least 4-6 hours) | Every 3–5 weeks in summer; once every 6–8 weeks in winter | Toxic to pets |
| Calla Lily | Bright indirect light (just back from a sunny window) | Keep consistently moist during active growth; reduce sharply for winter dormancy | Toxic to pets |
| Caltha palustris | Direct sun (at least 4-6 hours) | Keep wet at all times; saturated soil or shallow water | Toxic to pets |
| Caltha palustris 'Flore Pleno' | Direct sun (at least 4-6 hours) | Keep wet at all times; saturated soil or shallow water | Toxic to pets |
| Cameroon Cycad | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season; monthly in winter | Toxic to pets |
| 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 |
| Canadian Yew | Low light (north window or shaded room) | Weekly during establishment; every 1–2 weeks once established | Toxic to pets |
| Canary Island Lavender | Direct sun (at least 4-6 hours) | Every 2 weeks in the growing season; sparingly in winter | Toxic to pets |
| Candelabra Euphorbia | Direct sun (at least 4-6 hours) | When the mix is completely dry, about every 2-3 weeks in summer | Toxic to pets |
| Candelabra Lily | Direct sun (at least 4-6 hours) | Water moderately from first autumn rains (flower emergence) through winter-spring leaf period; keep bone dry all summer | Toxic to pets |
| Candelabra Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn–spring (active), near-zero in summer (dormant) | Toxic to pets |
| Candle larkspur | Direct sun (at least 4-6 hours) | Regular — deep watering 2–3 times per week during active growth; reduce in dormancy | Toxic to pets |
| Candle Larkspur 'Guardian Blue' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Candle plant | Bright indirect light (just back from a sunny window) | When the soil is fully dry; roughly every 2-3 weeks in growth, far less in summer dormancy | Toxic to pets |
| Candle Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during autumn and spring active growth; once a month or less in summer dormancy | Toxic to pets |
| Canna-leaved Peace Lily | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14 days in winter | Toxic to pets |
| Canna-Leaved Peace Lily | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Cape Clubfoot | Direct sun (at least 4-6 hours) | Every 14–21 days in summer; once monthly or less in winter | Toxic to pets |
| Cape Cycad | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, every 7-12 days in growth | Toxic to pets |
| Caramel Marble | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Cardboard Cycad | Direct sun (at least 4-6 hours) | When the soil is dry well down, roughly every 12-16 days in growth | Toxic to pets |
| Cardboard Palm | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in summer; roughly halve in autumn/winter | Toxic to pets |
| Cardinal climber | Direct sun (at least 4-6 hours) | Once or twice a week; approximately 2.5 cm (1 in) per week | Toxic to pets |
| Carla Black's Anthurium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (about 1 inch) of substrate dries out | Toxic to pets |
| Carmine Begonia | Bright indirect light (just back from a sunny window) | When the top 1 inch of soil is dry | Toxic to pets |
| Carnation of India | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth, every 10-14 days in winter | Toxic to pets |
| Carrot-leaved Pelargonium | Direct sun (at least 4-6 hours) | Water when the top 2–3 cm of compost is dry during growth (autumn–spring); completely dry in summer dormancy | Toxic to pets |
| 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 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 |
| Cast Iron Plant | Low light (north window or shaded room) | When the top half of the soil is dry, roughly every 10-14 days | Toxic to pets |
| Catawba rhododendron | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 7–14 days once established | Toxic to pets |
| Catawba Rhododendron 'Roseum Elegans' | Bright indirect light (just back from a sunny window) | About weekly, deeper in heat and drought; water when the top 3-5 cm of soil is dry | Toxic to pets |
| Catharanthus roseus 'Cora Cascade Strawberry' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days | Toxic to pets |
| Catharanthus roseus 'Titan Polka Dot' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days | Toxic to pets |
| Cathedral Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of compost feels dry, every 5-7 days in the growing season | Toxic to pets |
| Cathedral Bells | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, approximately every 10-14 days in summer | Toxic to pets |
| Caucasian Lily | Bright indirect light (just back from a sunny window) | Moderate — keep soil consistently moist but not waterlogged | Toxic to pets |
| Cavatine pieris | Bright indirect light (just back from a sunny window) | Weekly; keep consistently moist | 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 |
| 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 |
| Ceratozamia hildae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly weekly in growth | Toxic to pets |
| Ceratozamia mexicana | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly weekly in growth | Toxic to pets |
| Ceratozamia robusta | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly weekly in growth | Toxic to pets |
| Cercestis Mirabilis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Cercestis Stigmaticus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce in winter | Toxic to pets |
| Chamomile | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 7-10 days | Toxic to pets |
| Chandelier Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer | Toxic to pets |
| Chestnut Dioon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Toxic to pets |
| Chiapas Arrowhead Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14 days in winter | Toxic to pets |
| Chincherinchee | Direct sun (at least 4-6 hours) | Regularly during active growth; dry or minimal during summer dormancy | Toxic to pets |
| Chinese evergreen | Low light (north window or shaded room) | When the top 3 cm of soil is dry, every 7-10 days | 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 Peony 'Sarah Bernhardt' | Direct sun (at least 4-6 hours) | Deeply once or twice a week during dry spells; reduce after foliage dies back | Toxic to pets |
| Chinese Redbud | Direct sun (at least 4-6 hours) | Every 7-10 days during the first two growing seasons; established plants roughly every 14 days in dry spells | Toxic to pets |
| Chinese 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 Tylecodon | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); minimal or none in summer | Toxic to pets |
| Chinese Windmill Palm 'Bulgaria' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly weekly in summer | Toxic to pets |
| Chinese Yew | Medium indirect light (a couple of metres from a window) | Weekly during establishment; every 1–2 weeks once established | Toxic to pets |
| Chiric Sanango | Bright indirect light (just back from a sunny window) | Every 5-7 days in active growth, every 10-14 days in winter | Toxic to pets |
| Christmas Carol Aloe | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 1-2 weeks in summer | Toxic to pets |
| Christmas Rose | Medium indirect light (a couple of metres from a window) | Keep evenly moist while establishing and during summer drought; established plants tolerate moderate dryness | Toxic to pets |
| Chrysanthemum | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in active growth | Toxic to pets |
| Chrysanthemum 'Anastasia' | 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 |
| Chrysanthemum 'Bronze Elegance' | Direct sun (at least 4-6 hours) | Every 5-7 days when the top 2-3 cm of soil is dry; more frequently in hot weather | Toxic to pets |
| Chrysanthemum 'Cheryl Pride' | Direct sun (at least 4-6 hours) | Every 4-6 days, allowing the top 2-3 cm of soil to dry | Toxic to pets |
| Chrysanthemum 'Cottage Apricot' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Chrysanthemum 'Country Girl' | Direct sun (at least 4-6 hours) | Every 5-7 days in summer; reduce in autumn as growth slows | Toxic to pets |
| Chrysanthemum 'Emperor of China' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7 days | Toxic to pets |
| Chrysanthemum 'Golden Cascade' | Direct sun (at least 4-6 hours) | Every 3-5 days for container-grown plants; every 5-7 days in the ground when the top 2-3 cm of soil is dry | Toxic to pets |
| 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 |
| Chrysanthemum 'Innocence' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Chrysanthemum 'Mei-kyo' | Direct sun (at least 4-6 hours) | Every 5-7 days when the top 2-3 cm of soil is dry | Toxic to pets |
| Chrysanthemum 'Pennine Alfie' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 5-7 days in the growing season | Toxic to pets |
| Chrysanthemum 'Ruby Mound' | 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 | Toxic to pets |
| Chrysanthemum 'Rumpelstiltskin' | Direct sun (at least 4-6 hours) | Every 5-7 days, allowing the top 2 cm to dry between waterings | Toxic to pets |
| Chrysanthemum 'Ryan's Daisy' | Direct sun (at least 4-6 hours) | Every 5-7 days; increase to every 3-4 days in containers during hot spells | Toxic to pets |
| Chrysanthemum 'Salmon Allouise' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Chrysanthemum 'Snowdon' | 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 |
| Chrysanthemum 'Time Piece' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Chrysanthemum 'Will's Wonderful' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, approximately every 5-7 days | Toxic to pets |
| Chrysanthemum 'Yellow John Wingfield' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Chrysanthemum 'Zeal Bronze' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | 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 |
| Cilician Winter Aconite | Medium indirect light (a couple of metres from a window) | Moist during late winter and spring growth; dry to moderate when dormant | Toxic to pets |
| Clematis | Direct sun (at least 4-6 hours) | Keep evenly moist; water newly planted and container clematis frequently | Toxic to pets |
| Clematis 'Bill MacKenzie' | Direct sun (at least 4-6 hours) | Deeply about once a week while growing; less once established | Toxic to pets |
| Clematis 'Comtesse de Bouchaud' | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the growing season; more in heat or sandy soil | Toxic to pets |
| Clematis 'Doctor Ruppel' | Direct sun (at least 4-6 hours) | Deeply once or twice a week during the growing season; reduce in autumn and winter | Toxic to pets |
| Clematis 'Dr. Ruppel' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Clematis 'Duchess of Edinburgh' | Bright indirect light (just back from a sunny window) | Once or twice a week during the growing season | Toxic to pets |
| Clematis 'Ernest Markham' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about weekly in summer | Toxic to pets |
| Clematis 'Etoile Violette' | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the growing season | Toxic to pets |
| Clematis 'Fireworks' | Direct sun (at least 4-6 hours) | Once or twice a week in the growing season; reduce in autumn | Toxic to pets |
| Clematis 'General Sikorski' | Direct sun (at least 4-6 hours) | Once or twice a week during the growing season | Toxic to pets |
| Clematis 'H.F. Young' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil or compost is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Clematis 'Hagley Hybrid' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about weekly in the growing season | Toxic to pets |
| Clematis 'Henryi' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about weekly in summer | Toxic to pets |
| Clematis 'Jackmanii' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water deeply once or twice weekly in dry weather | Toxic to pets |
| Clematis 'Lasurstern' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil or compost is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Clematis 'Miss Bateman' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about weekly in the growing season | Toxic to pets |
| Clematis 'Mrs N. Thompson' | Direct sun (at least 4-6 hours) | Once or twice a week during the growing season; reduce in cooler months | Toxic to pets |
| Clematis 'Multi Blue' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Clematis 'Nelly Moser' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply once or twice a week in dry spells | Toxic to pets |
| Clematis 'Niobe' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about weekly in summer | Toxic to pets |
| Clematis 'Perle d'Azur' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 5-7 days during active growth | Toxic to pets |
| Clematis 'Piilu' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days during the growing season | Toxic to pets |
| Clematis 'Polish Spirit' | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week through the growing season | Toxic to pets |
| Clematis 'Rebecca' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Clematis 'Rouge Cardinal' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Clematis 'Rubens' | Direct sun (at least 4-6 hours) | Once or twice a week during dry spells, especially the first two seasons | Toxic to pets |
| Clematis 'The President' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply once or twice a week in dry spells | Toxic to pets |
| Clematis 'Ville de Lyon' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly weekly in the growing season | Toxic to pets |
| Clematis 'Warszawska Nike' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about weekly in summer | Toxic to pets |
| Clematis 'Westerplatte' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Clematis armandii | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly weekly in the growing season | Toxic to pets |
| Clematis florida 'Sieboldii' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Clematis integrifolia | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week through the growing season | Toxic to pets |
| Clematis montana | Direct sun (at least 4-6 hours) | Water regularly while establishing; mature plants are fairly drought-tolerant | Toxic to pets |
| Clematis montana 'Grandiflora' | Direct sun (at least 4-6 hours) | Once or twice a week while establishing; drought-tolerant once mature | Toxic to pets |
| Clematis recta | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the growing season | Toxic to pets |
| Clematis tangutica | Direct sun (at least 4-6 hours) | Deeply about once a week in the growing season; less once established | Toxic to pets |
| Clematis viticella | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week through the growing season | Toxic to pets |
| Cleopatra Begonia | Bright indirect light (just back from a sunny window) | When the top 1–2 cm of soil is dry | Toxic to pets |
| Cliff Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Toxic to pets |
| Cliff Cotyledon | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, approximately every 14 days in summer | 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 Fetterbush | Medium indirect light (a couple of metres from a window) | Frequent; keep consistently moist to wet | Toxic to pets |
| Climbing Hydrangea | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply weekly in the first 2-3 years and during dry spells | Toxic to pets |
| Climbing Oleander | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; allow topsoil to dry slightly between waterings | Toxic to pets |
| Climbing Onion | Bright indirect light (just back from a sunny window) | Every 1–2 weeks while vining; withhold water during dry-season dormancy | Toxic to pets |
| Clivia | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Clivia 'Belgian Hybrid' | Medium indirect light (a couple of metres from a window) | Water when the top few cm are dry in growth; keep nearly dry through the winter rest | Toxic to pets |
| Clivia 'Doris Joy' | Bright indirect light (just back from a sunny window) | When the top few cm are dry in growth (every 7-14 days); much less in the winter rest | Toxic to pets |
| Clustering Fishtail Palm | Bright indirect light (just back from a sunny window) | Water 1–2 times per week in active growth, reducing to weekly in winter | Toxic to pets |
| Coastal Doghobble | Medium indirect light (a couple of metres from a window) | Every 5–7 days; regular deep watering essential in dry periods | Toxic to pets |
| Coastal Leucothoe | Medium indirect light (a couple of metres from a window) | Regular; keep evenly moist | Toxic to pets |
| Cobra Lily | Low light (north window or shaded room) | Keep evenly moist through the spring-to-summer growing season, watering when the surface begins to dry; reduce as the plant dies back to dormancy. | Toxic to pets |
| Cocoon Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during active growth (spring and autumn); once a month in summer and winter | Toxic to pets |
| Coffee Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly every 5-7 days in summer and less in winter | Toxic to pets |
| Coffee-leaf Anubias | Low light (north window or shaded room) | Submerged aquatic — routine 20-30% weekly water changes are recommended. | Toxic to pets |
| Coleus | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, every 4-7 days | 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 'Illustris' (Imperial Taro) | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet; check every 2-4 days in active growth | Toxic to pets |
| Colocasia 'Mojito' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; often 2-3+ times per week in active growth | Toxic to pets |
| Colocasia 'Pink China' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet; water whenever the top inch starts to dry | Toxic to pets |
| Colocasia Black Coral | Direct sun (at least 4-6 hours) | Keep soil constantly moist; water every 2-4 days, daily in peak summer | Toxic to pets |
| Colocasia Blue Hawaii | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer heat | Toxic to pets |
| Colocasia Burgundy Stem | Direct sun (at least 4-6 hours) | Keep constantly moist to wet; water whenever the surface starts to dry | Toxic to pets |
| Colocasia Colocasia Gigantea Thailand Giant | Direct sun (at least 4-6 hours) | Keep constantly moist to wet; water daily in heat, or stand in shallow standing water | Toxic to pets |
| Colocasia Crown of Tonga | Direct sun (at least 4-6 hours) | Keep constantly moist to boggy; check every 1-3 days in heat, never letting it dry out | Toxic to pets |
| Colocasia Elena | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer | Toxic to pets |
| Colocasia Fontanesii | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; check every 2-4 days, never let it dry out | Toxic to pets |
| Colocasia Gigantea | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-3 days, daily in summer heat | Toxic to pets |
| Colocasia Hilo Beauty | Bright indirect light (just back from a sunny window) | Keep evenly moist to wet; check every 2-4 days, watering before the surface fully dries | Toxic to pets |
| Colocasia Illustris Black Runner | Direct sun (at least 4-6 hours) | Keep constantly moist; water daily in heat, or stand in 2-5 cm of standing water | Toxic to pets |
| Colocasia Nancy's Revenge | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer | Toxic to pets |
| Colocasia Pharaoh's Mask | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer heat | Toxic to pets |
| Colocasia Puckered Up | Bright indirect light (just back from a sunny window) | Keep soil constantly moist; water every 2-4 days, daily in summer heat | Toxic to pets |
| Colocasia Tea Cup | Direct sun (at least 4-6 hours) | Keep soil constantly moist; water every 2-4 days, daily in summer | Toxic to pets |
| Colombian Zamia | Bright indirect light (just back from a sunny window) | Every 10–21 days; reduce in winter when cold | Toxic to pets |
| 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 | Medium indirect light (a couple of metres from a window) | Moderate; water during dry spells | 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 |
| Columbine 'Nora Barlow' | Bright indirect light (just back from a sunny window) | Once or twice a week during dry spells; water stress shortens the flowering season | Toxic to pets |
| Comb Cycad | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–5 weeks in autumn and winter | Toxic to pets |
| 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 box | Medium indirect light (a couple of metres from a window) | Weekly during establishment; monthly once established in the ground | Toxic to pets |
| Common Boxwood 'Suffruticosa' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly weekly in summer | Toxic to pets |
| Common Broom | Direct sun (at least 4-6 hours) | sparingly after establishment | Toxic to pets |
| Common Candelabra Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in winter growing season; withhold almost entirely in summer dormancy | Toxic to pets |
| Common Foxglove | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water weekly in dry spells | Toxic to pets |
| Common Garden Tulip | Direct sun (at least 4-6 hours) | Naturally rainfall-dependent; water sparingly if dry after planting | Toxic to pets |
| Common Gladiolus | Direct sun (at least 4-6 hours) | Once or twice per week during active growth | Toxic to pets |
| Common Gorse | Direct sun (at least 4-6 hours) | rarely after establishment | Toxic to pets |
| 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 Hyacinth | Direct sun (at least 4-6 hours) | Weekly when in active growth; withhold water during summer dormancy | Toxic to pets |
| Common Milkweed | Direct sun (at least 4-6 hours) | Moderate; weekly when establishing, drought-tolerant once established | Toxic to pets |
| Common Nardoo | Bright indirect light (just back from a sunny window) | Keep permanently in water or wet mud | Toxic to pets |
| Common Peony 'Rubra Plena' | Direct sun (at least 4-6 hours) | Deeply once or twice a week during dry spring and summer weather; minimal watering once dormant | 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 Snowdrop | Medium indirect light (a couple of metres from a window) | Naturally moisture-retentive soil; supplemental watering in dry spells during growth | Toxic to pets |
| Common Star of Bethlehem | Direct sun (at least 4-6 hours) | Low; self-sufficient in a UK garden once established | Toxic to pets |
| Common tobacco | Direct sun (at least 4-6 hours) | Every 3–5 days; maintain consistently moist soil | Toxic to pets |
| Compact bog rosemary | Bright indirect light (just back from a sunny window) | Consistently moist; never allow to dry out | Toxic to pets |
| Compact 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 |
| 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 |
| Congo Anubias | Low light (north window or shaded room) | Submerged aquatic — 20-30% weekly water changes are standard. | Toxic to pets |
| Congo Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks (growing season); monthly or less in winter | Toxic to pets |
| Coontie | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Copper Rain Lily | Direct sun (at least 4-6 hours) | Low to moderate; rain-triggered | Toxic to pets |
| Cora XDR vinca | Direct sun (at least 4-6 hours) | Every 4–7 days once established; water young transplants more frequently | Toxic to pets |
| Coral Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, sparingly in winter | Toxic to pets |
| Coral Cactus | Bright indirect light (just back from a sunny window) | Every 2-4 weeks; let the soil dry out almost fully between waterings | Toxic to pets |
| Coral Lily | Direct sun (at least 4-6 hours) | When top 2–3 cm of soil is dry | Toxic to pets |
| Coral Plant | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Toxic to pets |
| Cordyline | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Cordyline australis | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Coris-Leaved St John's Wort | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Toxic to pets |
| Cork Palm | Bright indirect light (just back from a sunny window) | Every 2–3 weeks; very sparingly in winter | Toxic to pets |
| Corn Marigold | Direct sun (at least 4-6 hours) | Low to moderate — water only in dry spells | Toxic to pets |
| Corn plant | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Corn Plant | Bright indirect light (just back from a sunny window) | When the top 2.5cm (1in) of compost is dry, roughly every 7-10 days in summer | Toxic to pets |
| Cotyledon Eliseae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Cotyledon Orbiculata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Cotyledon Papillaris | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Cotyledon Tomentosa 'Bear Paw' | Bright indirect light (just back from a sunny window) | When the top soil is fully dry, roughly every 7-14 days in growth | 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 |
| Crabapple 'Evereste' | Direct sun (at least 4-6 hours) | Weekly during establishment and dry spells | Toxic to pets |
| Crabapple 'Hanagasa' | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, frequently daily in summer and less in dormancy | Toxic to pets |
| Crabapple 'John Downie' | Direct sun (at least 4-6 hours) | Weekly while young and in summer drought | Toxic to pets |
| Crabapple Bonsai | Direct sun (at least 4-6 hours) | When the surface soil starts to dry, often once or twice daily in summer | Toxic to pets |
| Crape Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days during growing season; reduce in winter | Toxic to pets |
| Crassula Alstonii | Direct sun (at least 4-6 hours) | Sparingly, roughly every 2-3 weeks in active growth and barely at all in dormancy | Toxic to pets |
| Crassula Capitella | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crassula Columnaris | Direct sun (at least 4-6 hours) | Sparingly, roughly every 2-3 weeks in active growth and almost none during summer dormancy | Toxic to pets |
| Crassula Columnella | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 12-16 days in growth | Toxic to pets |
| Crassula Falcata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, monthly or less in winter | Toxic to pets |
| Crassula Hemisphaerica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is fully dry, roughly every 10-14 days in growth; less in summer rest | Toxic to pets |
| Crassula Hummel's Sunset | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crassula Marnieriana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 3-4 weeks in winter | Toxic to pets |
| Crassula Nudicaulis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Crassula Pellucida | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in growth and far less in winter | Toxic to pets |
| Crassula Pyramidalis | Bright indirect light (just back from a sunny window) | Sparingly, only when soil is bone dry, roughly every 2-3 weeks in growth; nearly dry over summer rest | Toxic to pets |
| Crassula Rupestris | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in summer; very sparingly in winter | Toxic to pets |
| Crassula Setulosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Crassula Socialis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 3-4 weeks in winter | Toxic to pets |
| Crassula Tetragona | Direct sun (at least 4-6 hours) | When soil is dry, about every 7-12 days in summer; sparingly in winter | Toxic to pets |
| Crassula Undulata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crazy-leaf Begonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; every 10–14 days in winter | Toxic to pets |
| Cream Wild Indigo | Direct sun (at least 4-6 hours) | Low; water weekly in first season only | Toxic to pets |
| Creeping Begonia | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of compost feels dry, every 5-8 days in active growth | 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 Gaultheria | Medium indirect light (a couple of metres from a window) | Regularly; soil must not dry out | Toxic to pets |
| Crested Bracken | Medium indirect light (a couple of metres from a window) | every 1-2 weeks once established | Toxic to pets |
| Crested Euphorbia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Crested Iris | Medium indirect light (a couple of metres from a window) | Moderate — keep evenly moist | Toxic to pets |
| Cretan Arum | Direct sun (at least 4-6 hours) | Moderate during autumn–spring active growth; completely dry in summer | Toxic to pets |
| Crimson Cestrum | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in winter | Toxic to pets |
| Crimson Flag Lily | Direct sun (at least 4-6 hours) | Consistently moist throughout the growing season | Toxic to pets |
| Crisped Water Trumpet | Medium indirect light (a couple of metres from a window) | Permanently submerged; substrate should never dry out | Toxic to pets |
| Croton | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 5-7 days | Toxic to pets |
| Croton Gold Dust | 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 |
| Crown Begonia | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of compost feels dry | Toxic to pets |
| Crown Imperial | Direct sun (at least 4-6 hours) | Regular in spring growth phase; dry to minimal in summer dormancy | Toxic to pets |
| Crown of Thorns | Direct sun (at least 4-6 hours) | Every 1-2 weeks in growth; sparingly in winter | Toxic to pets |
| Cryptocoryne nurii | Low light (north window or shaded room) | Submerged: keep continuously immersed; 25-30% weekly water changes. Emersed: keep substrate constantly moist, never drying out | Toxic to pets |
| Crystal Anthurium | Bright indirect light (just back from a sunny window) | When the top 2-3cm of compost dries, roughly weekly in summer | Toxic to pets |
| Crystal Palace lobelia | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, typically every 2-3 days in summer | Toxic to pets |
| Crystal Palace Lobelia | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil feels dry, roughly every 3-5 days | Toxic to pets |
| Cuban Lily | Direct sun (at least 4-6 hours) | Moderate in autumn through spring; restrict in summer | 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 |
| Cupani sweet pea | Direct sun (at least 4-6 hours) | Every 3–5 days in warm growing conditions; adjust for rainfall | Toxic to pets |
| Curio Articulatus | Bright indirect light (just back from a sunny window) | When the mix is dry through, roughly every 10-14 days in active growth and every 3-4 weeks while resting | Toxic to pets |
| Curio Citriformis | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, about every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Ficoides | Direct sun (at least 4-6 hours) | Water deeply only when the soil is fully dry, roughly every 2-3 weeks in summer and far less in winter | Toxic to pets |
| Curio Ficoides 'Mount Everest' | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in summer; sparingly in winter | Toxic to pets |
| Curio peregrinus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-21 days; far less in winter | Toxic to pets |
| Curio Radicans | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, about every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Rowleyanus | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Talinoides var. mandraliscae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Curly Begonia | Medium indirect light (a couple of metres from a window) | When the top of the sphagnum moss begins to lose moisture | Toxic to pets |
| Curror's Cyphostemma | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; once every 6–8 weeks or less in winter | Toxic to pets |
| Cycas Panzhihuaensis | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm of soil is dry, roughly every 1-2 weeks in growth | Toxic to pets |
| Cycas Rumphii | Bright indirect light (just back from a sunny window) | Water when the top 3-5 cm of soil is dry, roughly every 1-2 weeks | Toxic to pets |
| Cyclamen | Bright indirect light (just back from a sunny window) | When the soil surface feels dry, roughly every 5-10 days in bloom | Toxic to pets |
| Cyclamen 'Victoria' | Bright indirect light (just back from a sunny window) | When the top of the compost feels dry, roughly every 5-7 days while in growth | Toxic to pets |
| Cyclamen-flowered Daffodil | Bright indirect light (just back from a sunny window) | Regular during autumn to late spring; dry summer dormancy | Toxic to pets |
| Cylindric Arum | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry during the growing season; cease watering during summer dormancy | Toxic to pets |
| Cylindrical Snake Plant | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring and summer; roughly monthly in winter | Toxic to pets |
| Daffodil | Direct sun (at least 4-6 hours) | Rely on rainfall in autumn-spring; keep dry in summer | Toxic to pets |
| Daffodil | Bright indirect light (just back from a sunny window) | Moderate during active growth (autumn–spring); dry during summer dormancy | Toxic to pets |
| Dahlia | Direct sun (at least 4-6 hours) | Deep watering 2-3 times per week, more in heat | Toxic to pets |
| Dahlia 'Ace Summer Sunset' | Direct sun (at least 4-6 hours) | Water deeply 2-3 times a week in summer once established, more during heat | Toxic to pets |
| Dahlia 'Akita' | 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 |
| Dahlia 'American Dawn' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week, more during heat | Toxic to pets |
| Dahlia 'Bishop of Llandaff' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Boom Boom White' | Direct sun (at least 4-6 hours) | Water deeply 2-3 times a week through summer once established, more in heat | Toxic to pets |
| Dahlia 'Breakout' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week, more in heat | Toxic to pets |
| Dahlia 'Cafe au Lait' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Camano Ariel' | Direct sun (at least 4-6 hours) | Every 5-7 days, or when the top 2-3 cm of soil feels dry | Toxic to pets |
| Dahlia 'Contraste' | Direct sun (at least 4-6 hours) | Every 5-7 days, or when the top 2-3 cm of soil is dry | Toxic to pets |
| Dahlia 'Decorette Rose' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days; container plants may need daily watering in hot weather | Toxic to pets |
| Dahlia 'Fire Magic' | Direct sun (at least 4-6 hours) | Every 5-7 days once established, or when the top 2-3 cm of soil is dry | Toxic to pets |
| Dahlia 'Ginger Snap' | Direct sun (at least 4-6 hours) | Water deeply 2-3 times a week in summer once established, more in heat | Toxic to pets |
| Dahlia 'Hollyhill Black Beauty' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week, more in heat | Toxic to pets |
| Dahlia 'Jazz' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Karma Naomi' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week once established, more in heat | Toxic to pets |
| Dahlia 'Labyrinth' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week, increasing in heat | Toxic to pets |
| Dahlia 'Mingus Tina' | Direct sun (at least 4-6 hours) | Every 3-4 days during active growth, more frequently in hot weather | Toxic to pets |
| Dahlia 'Mrs Eileen' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Mystery Day' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Orange Mullet' | Direct sun (at least 4-6 hours) | Every 5-7 days, or when the top 2-3 cm of soil is dry | Toxic to pets |
| Dahlia 'Penhill Dark Monarch' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Penhill Watermelon' | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week, more during heat | Toxic to pets |
| Dahlia 'Purple Taiheijo' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Rip City' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Dahlia 'Senior Ball' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days; more often in hot weather | Toxic to pets |
| Dahlia 'Soda Fountain' | Direct sun (at least 4-6 hours) | Every 3-4 days in warm weather; less in cool spells | Toxic to pets |
| Danford Iris | Direct sun (at least 4-6 hours) | Moderate in late winter and early spring; dry in summer | Toxic to pets |
| Daphne cneorum | Direct sun (at least 4-6 hours) | Water when the top few centimetres of soil are dry; keep evenly moist but sharply drained | Toxic to pets |
| Daphne laureola | Low light (north window or shaded room) | Weekly while establishing; rarely once established | Toxic to pets |
| Daphne mezereum | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist, never waterlogged | Toxic to pets |
| Daphne odora | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist, never soggy | Toxic to pets |
| Daphne odora 'Aureomarginata' | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist but never wet | Toxic to pets |
| Daphne x burkwoodii 'Carol Mackie' | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist, never waterlogged | Toxic to pets |
| dark form scindapsus | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 10–14 days in winter | Toxic to pets |
| Dark Green Ceratozamia | Medium indirect light (a couple of metres from a window) | Weekly in summer; every 2–3 weeks in winter | Toxic to pets |
| 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 'Autumn Minaret' | Direct sun (at least 4-6 hours) | Every 7-14 days during active growth; minimal in winter dormancy | Toxic to pets |
| Daylily 'Bitsy' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season; reduce to once every 2-3 weeks as foliage dies back | Toxic to pets |
| Daylily 'Black-eyed Stella' | 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 'Bumble Bee' | Direct sun (at least 4-6 hours) | Every 7-10 days in active growth; every 2-3 weeks once dormant | Toxic to pets |
| Daylily 'Catherine Woodbery' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season; every 2-3 weeks during dormancy | 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 'Chorus Line' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth and rebloom cycles; reduce to every 2-3 weeks in 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 'Double River Wye' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; every 2-3 weeks during dormancy | Toxic to pets |
| Daylily 'Fragrant Returns' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; consistent moisture supports multiple rebloom cycles | 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 'Golden Zebra' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season; reduce to every 2-3 weeks as foliage dies back | Toxic to pets |
| Daylily 'Happy Returns' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days during active growth | 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 'Ice Carnival' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; every 2-3 weeks in dormancy | Toxic to pets |
| Daylily 'Joan Senior' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; every 1-2 weeks in winter (evergreen foliage requires some moisture year-round in mild climates) | Toxic to pets |
| Daylily 'Little Grapette' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; every 2-3 weeks in dormancy | Toxic to pets |
| Daylily 'Luxury Lace' | 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 '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 'Midnight Magic' | 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 'Miss Amelia' | 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 'Mozhart' | 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 'Nile Crane' | 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 'Pardon Me' | 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 'Pearl Lewis' | 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 'Purple d'Oro' | 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 '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 'Rosy 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 'Ruby Spider' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7 days during summer | Toxic to pets |
| Daylily 'Sanctuary' | 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 'Siloam Double Classic' | Direct sun (at least 4-6 hours) | Roughly every 7-10 days during the growing season, or when the top 5 cm of soil is dry | Toxic to pets |
| Daylily 'Siloam Virginia Henson' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth, or when the top 5 cm of soil is dry | Toxic to pets |
| Daylily 'So Lovely' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season, or when the top 5 cm of soil is dry | 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 |
| Daylily 'Stella de Oro' | 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 'Stoke Poges' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season, or when the top 5 cm of soil is dry | Toxic to pets |
| Daylily 'Strawberry Candy' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season, or when the top 5 cm of soil is dry | Toxic to pets |
| Daylily 'Tiger Bloodlines' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season, or when the top 5 cm of soil is dry | Toxic to pets |
| Daylily 'Tuscawilla Snowfall' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season, or when the top 5 cm of soil is dry | Toxic to pets |
| Daylily 'When I Dream' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season, or when the top 5 cm of soil is dry | Toxic to pets |
| Daylily 'Wind Frills' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season, 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 |
| Deciduous Azalea 'Gibraltar' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply 1-2 times weekly through summer, more in heat | Toxic to pets |
| Delicious Begonia | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of compost feels dry | Toxic to pets |
| Delphinium 'Black Knight' | Direct sun (at least 4-6 hours) | Every 3-5 days in growth; keep soil consistently moist, never dry | Toxic to pets |
| Delphinium 'Galahad' | Direct sun (at least 4-6 hours) | Every 3-5 days in growth; keep the soil consistently moist, never dry | Toxic to pets |
| Delphinium 'Magic Fountains' | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply 2-3 times weekly in growth | Toxic to pets |
| Delphinium 'Pacific Giant' | Direct sun (at least 4-6 hours) | Keep consistently moist; water deeply 2-3 times weekly in growth | Toxic to pets |
| Delphinium grandiflorum 'Blue Butterfly' | Direct sun (at least 4-6 hours) | Every 4-7 days; keep soil moist but well-drained, avoiding extremes | Toxic to pets |
| Dense-flowered Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter | Toxic to pets |
| Densiformis Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, roughly weekly while establishing | Toxic to pets |
| Desert Rose | Direct sun (at least 4-6 hours) | Every 7-10 days in active growth; roughly monthly in winter dormancy | Toxic to pets |
| Dianthus 'Doris' | Direct sun (at least 4-6 hours) | Water when the top few cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus 'Mrs Sinkins' | Direct sun (at least 4-6 hours) | Water when the top few cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus deltoides | Direct sun (at least 4-6 hours) | Water when soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus gratianopolitanus 'Firewitch' | Direct sun (at least 4-6 hours) | Water when soil is dry; very drought-tolerant once established | Toxic to pets |
| Dicentra formosa 'Luxuriant' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil begins to dry, roughly every 5-7 days | Toxic to pets |
| Dieffenbachia | Medium indirect light (a couple of metres from a window) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dieffenbachia 'Camille' | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, about every 7-10 days in summer | Toxic to pets |
| Dieffenbachia 'Compacta' | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 7-10 days in summer | Toxic to pets |
| Dieffenbachia 'Tropic Snow' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Toxic to pets |
| Dieffenbachia Amy | 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 |
| 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 Reflector | 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 |
| Dieffenbachia Sparkles | 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 |
| 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 |
| Dieffenbachia Tropic Marianne | 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 |
| 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 |
| Dioon mejiae | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Dioscorides' Arum | Bright indirect light (just back from a sunny window) | Moderate during active growth (autumn–spring); dry off completely in summer | Toxic to pets |
| Double Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (keep soil consistently moist) | Toxic to pets |
| Double Bloodroot | Medium indirect light (a couple of metres from a window) | Every 5–7 days during spring growth; withhold or greatly reduce during summer dormancy | Toxic to pets |
| Double Pink Oleander | Direct sun (at least 4-6 hours) | Water weekly when establishing; drought-tolerant once established | Toxic to pets |
| Double Pinwheel Flower | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce in winter | Toxic to pets |
| Double-Flowered Bloodroot | Medium indirect light (a couple of metres from a window) | Moderate in spring; reduce as plant approaches dormancy in summer | Toxic to pets |
| Dracaena | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Dracaena 'Janet Craig' | Bright indirect light (just back from a sunny window) | Every 10-14 days; when the top third of the soil is dry | Toxic to pets |
| Dracaena 'Lemon Lime' | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 2-5 cm (1-2 in) of soil dry out first | Toxic to pets |
| Dracaena 'Song of India' | Bright indirect light (just back from a sunny window) | Roughly every 7–10 days in growth; let the top 2.5–5 cm of mix dry first. Water less in winter or low light. | Toxic to pets |
| Dracaena Aletriformis | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Arborea | Bright indirect light (just back from a sunny window) | When top 4-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Aubryana | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Bicolor | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Braunii | Medium indirect light (a couple of metres from a window) | Soil: when top 2-3 cm is dry, every 7-10 days. Water culture: top up weekly, full change every 2-3 weeks | Toxic to pets |
| Dracaena Camerooniana | Low light (north window or shaded room) | When the top 2-3 cm of soil is dry, every 5-7 days | Toxic to pets |
| Dracaena Cinnabari | Direct sun (at least 4-6 hours) | When soil is largely dry, roughly every 2-3 weeks | Toxic to pets |
| Dracaena Compacta | Medium indirect light (a couple of metres from a window) | When top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Deremensis Dorado | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dracaena Deremensis Green Stripe | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dracaena Deremensis Janet Craig | Low light (north window or shaded room) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Deremensis Warneckii | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dracaena Draco | Direct sun (at least 4-6 hours) | When the soil is mostly dry, roughly every 14-21 days | Toxic to pets |
| Dracaena Ellenbeckiana | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Dracaena Fragrans Lindenii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dracaena Fragrans Massangeana | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dracaena Fragrans Sol | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Dracaena Fragrans Victoria | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dracaena Goldieana | 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 |
| Dracaena Hookeriana | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, every 10-14 days | Toxic to pets |
| Dracaena Laxissima | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dracaena Marginata Bicolor | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Marginata Tricolor | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 1-2 weeks | Toxic to pets |
| Dracaena Reflexa | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 1-2 weeks | Toxic to pets |
| Dracaena Reflexa Song of Jamaica | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 1-2 weeks | Toxic to pets |
| Dracaena Sanderiana Variegata | Bright indirect light (just back from a sunny window) | Soil: when top 2-3 cm is dry, every 7-10 days. Water culture: top up weekly, full change every 2-3 weeks | Toxic to pets |
| Dracaena Steudneri | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dracaena Surculosa Florida Beauty | 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 |
| Dracaena Thalioides | 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 |
| Dracaena Trifasciata Mikado | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Dracaena Umbraculifera | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Volkensii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dracaena Warneckii | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 2-5 cm (1-2 in) of soil dry out first | Toxic to pets |
| Dracontium gigas | Bright indirect light (just back from a sunny window) | Keep evenly moist in active growth; let the top 3-4 cm dry between waterings, then withhold once the leaf yellows for dormancy | Toxic to pets |
| Dracontium polyphyllum | Bright indirect light (just back from a sunny window) | When the top few cm of soil dry while in leaf; nearly dry when dormant | Toxic to pets |
| Dracunculus canariensis | Direct sun (at least 4-6 hours) | Water in autumn-through-spring growth when the top few cm dry; keep dry during summer dormancy | Toxic to pets |
| Dragon Arum | Direct sun (at least 4-6 hours) | Water moderately in spring growth, letting the top few cm dry; keep dry once foliage dies down in summer | Toxic to pets |
| Dragon Tail Plant | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Dragon tree | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Dragon Tree Colorama | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Dragon Wing Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 5-7 days; more in heat | Toxic to pets |
| Dragon-Shield Begonia | Bright indirect light (just back from a sunny window) | Every 10–14 days; allow partial drying between waterings | Toxic to pets |
| Drakensberg Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; minimal in winter | Toxic to pets |
| Dressler's Anthurium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (about 1 inch) of mix is dry | Toxic to pets |
| Dressler's Zamia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to partially dry) | Toxic to pets |
| Drooping Clivia | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 7-12 days in growth | Toxic to pets |
| Drooping Leucothoe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; weekly in dry spells | Toxic to pets |
| Drooping Star of Bethlehem | Bright indirect light (just back from a sunny window) | Low; rainfall usually sufficient in temperate gardens | Toxic to pets |
| Drooping Star of Bethlehem | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry during active growth, roughly every 7-10 days | Toxic to pets |
| Drop Tongue Plant (Silver Schismatoglottis) | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of soil are dry | Toxic to pets |
| Dusty zenobia | Bright indirect light (just back from a sunny window) | Consistently moist — water deeply and regularly, especially in summer heat | Toxic to pets |
| Dutch Iris | Direct sun (at least 4-6 hours) | Moderate during growth; dry in summer dormancy | Toxic to pets |
| Dutchman's Breeches | Medium indirect light (a couple of metres from a window) | Every 3-5 days in spring; none needed once dormant | 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 blue rhododendron | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; sparingly in winter | Toxic to pets |
| Dwarf Cardboard Palm | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, roughly every 7-12 days in growth | Toxic to pets |
| Dwarf Cycad | Bright indirect light (just back from a sunny window) | Every 2–4 weeks | Toxic to pets |
| Dwarf Golden Oriental Arborvitae | Direct sun (at least 4-6 hours) | Moderate — weekly when young, reduced once established | Toxic to pets |
| Dwarf Golden Oriental Arborvitae | Direct sun (at least 4-6 hours) | Once per week when the top 2-3 cm of soil is dry; more frequently in hot, dry summers | Toxic to pets |
| Dwarf Japanese Yew | Medium indirect light (a couple of metres from a window) | Moderate — drought-tolerant once established | Toxic to pets |
| Dwarf Mountain Laurel Elf | Bright indirect light (just back from a sunny window) | Regular; maintain even moisture | Toxic to pets |
| Dwarf Pieris | Bright indirect light (just back from a sunny window) | Regular; keep evenly moist | Toxic to pets |
| Dwarf Remusatia | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; reduce significantly during dormancy | Toxic to pets |
| Dwarf Snowberry | Bright indirect light (just back from a sunny window) | Regularly, keeping soil consistently moist | Toxic to pets |
| Dwarf Sugar Palm | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Dwarf Tulip | Direct sun (at least 4-6 hours) | Sparingly; water at planting then only if soil dries out completely; cease watering after foliage dies back | Toxic to pets |
| Dwarf Umbrella Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dyer's Cycad | Direct sun (at least 4-6 hours) | Every 3–6 weeks | Toxic to pets |
| Dyer's Macrozamia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in growing season; once a month or less in summer drought/winter | Toxic to pets |
| Early Squill | Direct sun (at least 4-6 hours) | Water during active growth; keep drier in summer | Toxic to pets |
| Easter Lily | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil is dry | Toxic to pets |
| Eastern Cape Blue Cycad | Direct sun (at least 4-6 hours) | Every 3–6 weeks in summer; once a month or less in winter | Toxic to pets |
| Eastern Cape Cycad | Direct sun (at least 4-6 hours) | Every 21–30 days; extremely drought-tolerant | Toxic to pets |
| Eastern Cape Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks; less in winter | Toxic to pets |
| Eastern Cyclamen | Medium indirect light (a couple of metres from a window) | Minimal in summer dormancy; rely on rainfall during autumn–spring growth | Toxic to pets |
| Eastern Skunk Cabbage | Low light (north window or shaded room) | Continuously waterlogged; tolerates standing water | 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 |
| Ecuador Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (consistent moisture essential) | Toxic to pets |
| Edging lobelia | Bright indirect light (just back from a sunny window) | Every 2–3 days in warm weather; every 5–7 days in cool conditions | Toxic to pets |
| Eleanor Roosevelt Croton | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Elephant ear | Bright indirect light (just back from a sunny window) | Soil should stay consistently moist during the growing season | Toxic to pets |
| Elephant Foot Yam | Bright indirect light (just back from a sunny window) | Freely when actively growing; stop completely once the leaf dies back | Toxic to pets |
| Elephant's Foot Pachypodium | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; withhold almost completely in winter | Toxic to pets |
| Elephant's Foot Pachypodium | Direct sun (at least 4-6 hours) | When the top half to two-thirds of the soil is dry in the growing season, roughly every 10-14 days in summer; almost none in winter | Toxic to pets |
| Elise's Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season, every 3–5 weeks in winter | Toxic to pets |
| Elk Horns Pig's Ear | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring/summer; monthly or less in autumn/winter | Toxic to pets |
| Elliptic Kopsia | Direct sun (at least 4-6 hours) | Every 7–10 days when established; more frequently when young | Toxic to pets |
| Ellwoodii False Cypress | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply weekly while establishing, then during dry spells | Toxic to pets |
| Elm-Leaf Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; reduce to every 14 days in winter | Toxic to pets |
| Emei Mountain Begonia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; reduce significantly in winter dormancy | Toxic to pets |
| Emerald Gaiety Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Emerald n Gold Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| 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 |
| Emperor Tulip | Direct sun (at least 4-6 hours) | Rainfall-dependent during growth; summer dry period essential | Toxic to pets |
| Empress Wu Hosta | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days in growth | Toxic to pets |
| Encephalartos Ferox | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in growth, far less in winter | Toxic to pets |
| Encephalartos lebomboensis | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Encephalartos transvenosus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly weekly to fortnightly in summer | Toxic to pets |
| Encephalartos Villosus | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days in growth, reduced in winter | Toxic to pets |
| Encore Azalea 'Autumn Twist' | Bright indirect light (just back from a sunny window) | About 2-3 times per week while establishing, then weekly; water when the top 2-3 cm of soil is dry | Toxic to pets |
| Endura Scarlet Verbena | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-8 days | Toxic to pets |
| English Bluebell | Medium indirect light (a couple of metres from a window) | Moderate; naturally moist in spring, drier 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 |
| English Yew Bonsai | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, around every 2-4 days in summer and less in winter | Toxic to pets |
| Epiphytic Zamia | Bright indirect light (just back from a sunny window) | Every 7–10 days; do not allow to dry out completely | Toxic to pets |
| Epipremnum amplissimum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum amplissimum 'Silver Streak' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Aureum Global Green | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Aureum Harlequin | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Aureum Jessenia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Aureum Shangri-La | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Aureum Snow Queen | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum pinnatum 'Albo Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Pinnatum Albo | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in growth; let the top 3-5 cm (1-2 in) dry first | Toxic to pets |
| Epipremnum Pinnatum Dragon Tail | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Epipremnum Pinnatum Skeleton Key | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Equal-Wing Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil becomes dry | Toxic to pets |
| Escargot Begonia | Bright indirect light (just back from a sunny window) | When the top 1-1.5 inches of mix dries out (roughly every 5-9 days indoors) | Toxic to pets |
| Escargot Rex 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 |
| Euphorbia aeruginosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer and monthly or less in winter | Toxic to pets |
| Euphorbia ammak | Direct sun (at least 4-6 hours) | When the top half of the soil is dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia antisyphilitica | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer, minimal in winter | Toxic to pets |
| Euphorbia bubalina | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, about weekly in summer; sparingly in winter | Toxic to pets |
| Euphorbia bupleurifolia | Bright indirect light (just back from a sunny window) | When the soil is dry while in leaf and active growth; keep nearly dry while leafless and dormant | Toxic to pets |
| Euphorbia caput-medusae | Direct sun (at least 4-6 hours) | When fully dry, about every 2 weeks in summer; minimal in winter | Toxic to pets |
| Euphorbia clavarioides | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; keep bone-dry in winter | Toxic to pets |
| Euphorbia columnaris | Direct sun (at least 4-6 hours) | When fully dry in warm growth, roughly every 2-3 weeks; almost none in winter | Toxic to pets |
| Euphorbia cooperi | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer; minimal in winter | Toxic to pets |
| Euphorbia cylindrifolia | Bright indirect light (just back from a sunny window) | When the soil is dry in the growing season, roughly every 1-2 weeks; sparing in winter | Toxic to pets |
| Euphorbia decaryi | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in the growing season, sparingly in winter | Toxic to pets |
| Euphorbia enopla | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer; almost none in winter | Toxic to pets |
| Euphorbia esculenta | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, near-zero in winter | Toxic to pets |
| Euphorbia ferox | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; almost none in winter | Toxic to pets |
| Euphorbia flanaganii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in the growing season, monthly or less in winter | Toxic to pets |
| Euphorbia francoisii | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in the growing season, sparingly in winter | Toxic to pets |
| Euphorbia globosa | Direct sun (at least 4-6 hours) | When the soil is bone dry, about every 2-3 weeks in growth, almost none in winter | Toxic to pets |
| Euphorbia gorgonis | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| Euphorbia grandicornis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia groenewaldii | Direct sun (at least 4-6 hours) | When fully dry in the growing season, about every 2-3 weeks; almost none in winter | Toxic to pets |
| Euphorbia horrida | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia ingens | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia knuthii | Direct sun (at least 4-6 hours) | When fully dry in growth, about every 2-3 weeks; keep nearly dry in winter | Toxic to pets |
| Euphorbia lactea 'White Ghost' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia mammillaris | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia meloformis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia milii 'Lutea' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 1-2 weeks; less in winter | Toxic to pets |
| Euphorbia milii 'Rosea' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Euphorbia obesa subsp. symmetrica | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in active growth; nearly dry over winter | Toxic to pets |
| Euphorbia persistentifolia | Direct sun (at least 4-6 hours) | When the soil is dry, about every 1-2 weeks in summer; sparingly in winter | Toxic to pets |
| Euphorbia piscidermis | Direct sun (at least 4-6 hours) | Sparingly, only when bone dry, roughly every 3 weeks in growth, nearly none in winter | Toxic to pets |
| Euphorbia polygona | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia pseudocactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; nearly none in winter | Toxic to pets |
| Euphorbia pulvinata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth; near-zero in winter | Toxic to pets |
| Euphorbia resinifera | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; keep nearly dry in winter | Toxic to pets |
| Euphorbia schoenlandii | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer; nearly none in winter | Toxic to pets |
| Euphorbia stellata | Bright indirect light (just back from a sunny window) | Sparingly when fully dry in growth, roughly every 2-3 weeks in summer; none while dormant | Toxic to pets |
| Euphorbia suzannae | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer, sparse in winter | Toxic to pets |
| Euphorbia symmetrica | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| Euphorbia tirucalli 'Firesticks' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia tortirama | Direct sun (at least 4-6 hours) | When the soil is fully dry during growth, roughly every 2-3 weeks; keep dry in winter dormancy | Toxic to pets |
| Euphorbia Trigona 'Rubra' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Euphorbia valida | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| European Wild Ginger | Low light (north window or shaded room) | Moderate; water when the top 3–4 cm of soil dries out | Toxic to pets |
| Evergreen Amaryllis | Bright indirect light (just back from a sunny window) | Year-round watering every 7–14 days; slightly reduced in winter but never fully withheld | Toxic to pets |
| Eyelash Begonia | 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 |
| Eyelash Begonia | Medium indirect light (a couple of metres from a window) | When the top 1–2 cm of soil is dry | Toxic to pets |
| Fadang | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; every 3–4 weeks in winter | Toxic to pets |
| Fagus sylvatica 'Dawyck' | Direct sun (at least 4-6 hours) | Weekly while establishing; water in dry spells | Toxic to pets |
| False shamrock | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, every 5-7 days | Toxic to pets |
| Fastigiata Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Faulkner box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Fern-Leaf Begonia | Bright indirect light (just back from a sunny window) | When the top 1–2 cm of soil begins to dry | Toxic to pets |
| Fern-leaf Yarrow 'Gold Plate' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days; very infrequent once established | Toxic to pets |
| Few-leaflet Zamia | Bright indirect light (just back from a sunny window) | Every 3–4 weeks | Toxic to pets |
| Ficus Abidjan (burgundy rubber plant) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Ficus Altissima 'Yellow Gem' | Bright indirect light (just back from a sunny window) | When the top 5 cm (2 in) of soil is dry | Toxic to pets |
| Ficus Audrey | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Ficus Melany (compact rubber plant) | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Ficus microcarpa | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, often every 4-7 days indoors | Toxic to pets |
| Ficus 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 |
| Ficus Ruby | Bright indirect light (just back from a sunny window) | When the top 2-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Ficus Tineke (variegated rubber plant) | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Fiddle leaf fig | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Fiddle-Leaf Fig Bambino | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, typically every 7-10 days | Toxic to pets |
| Fiddle-leaf Pelargonium | Direct sun (at least 4-6 hours) | Water every 10-14 days in the growing season; reduce to monthly or less in winter | Toxic to pets |
| Field Bindweed | Direct sun (at least 4-6 hours) | Low — extremely drought-tolerant once established | Toxic to pets |
| Field Gladiolus | Direct sun (at least 4-6 hours) | Moderate during late winter to late spring growing season; dry summer dormancy required | Toxic to pets |
| Fingers Anthurium | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm (about 1 inch) of substrate has dried | Toxic to pets |
| 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 |
| Fireflush Rex Begonia | Medium indirect light (a couple of metres from a window) | Every 7–12 days; bottom-water preferred | 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 |
| 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 |
| Flamingo Flower | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix feels dry, roughly weekly in growth | Toxic to pets |
| Flamingo pieris | Bright indirect light (just back from a sunny window) | Weekly during dry weather | Toxic to pets |
| Flat-Leaved Crassula | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, approximately every 10-14 days in summer | Toxic to pets |
| Flax-leaved Tulip | Direct sun (at least 4-6 hours) | Water during active growth; keep dry in summer | Toxic to pets |
| 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 |
| Florida Arrowroot | Bright indirect light (just back from a sunny window) | Every 14–21 days; much less in winter | Toxic to pets |
| Florida Beauty | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Florida Ghost | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Florida Torreya | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Florist's Cyclamen | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil feels dry, roughly every 5-7 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 coleus | Bright indirect light (just back from a sunny window) | Twice-weekly watering | Toxic to pets |
| Flowering tobacco | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil consistently moist | Toxic to pets |
| Forbes' Glory of the Snow | Bright indirect light (just back from a sunny window) | Relies on natural rainfall during its growing season; water lightly if spring is unusually dry | Toxic to pets |
| Forest Epipremnum | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 8-12 days | Toxic to pets |
| Forest Flame pieris | Bright indirect light (just back from a sunny window) | Weekly during dry periods | Toxic to pets |
| Forest Flame Pieris | Bright indirect light (just back from a sunny window) | Every 7-10 days in the growing season; established plants roughly every 10-14 days, more frequently during dry spells | Toxic to pets |
| Forest Lily Amaryllis | Medium indirect light (a couple of metres from a window) | Regular during growing season (every 7–10 days); significantly reduced or withheld during dormancy | Toxic to pets |
| Forget's Anthurium | Bright indirect light (just back from a sunny window) | Roughly once or twice a week in the growing season, less in winter | 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 |
| Forking larkspur | Direct sun (at least 4-6 hours) | Every 5–8 days | 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 |
| Fortune Plum Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, roughly every 10-14 days in the growing season | Toxic to pets |
| Fortune's Plum Yew | Medium indirect light (a couple of metres from a window) | Every 7–14 days; allow the top inch of soil to partially dry between waterings | Toxic to pets |
| Foxglove | Bright indirect light (just back from a sunny window) | Regularly — weekly in summer, less in winter | Toxic to pets |
| Foxglove 'Camelot Lavender' | Bright indirect light (just back from a sunny window) | Once or twice a week in dry conditions, ensuring even moisture during flower spike development | Toxic to pets |
| Foxglove 'Camelot' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water weekly in dry weather | Toxic to pets |
| Foxtail Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 inches of soil are dry | Toxic to pets |
| 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 Peace Lily | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-10 days | Toxic to pets |
| Fragrant Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; drought-tolerant once established | Toxic to pets |
| Fragrant Water Lily | Direct sun (at least 4-6 hours) | Aquatic — permanently grown in standing water | Toxic to pets |
| 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 |
| Franklin's Gem Boxwood | Direct sun (at least 4-6 hours) | Deep soak weekly during the first two seasons, then every 10-14 days in dry spells | Toxic to pets |
| Fringed Bleeding Heart | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Toxic to pets |
| Fringed Cobra Lily | Medium indirect light (a couple of metres from a window) | Regularly during growing season; reduce in dormancy | Toxic to pets |
| Fuerte Avocado | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, about every 5-7 days in warm growth | Toxic to pets |
| Garden Gladiolus | Direct sun (at least 4-6 hours) | Weekly deep watering during active growth; reduce after flowering; cease after first frost kills foliage | Toxic to pets |
| Garden's Clivia | Bright indirect light (just back from a sunny window) | Water freely in spring and summer; reduce to minimal in autumn and winter. | Toxic to pets |
| Gardenia | Bright indirect light (just back from a sunny window) | When the top 2-3cm of compost feels dry | Toxic to pets |
| Gardenia 'Frostproof' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of soil dries, about every 4-7 days | Toxic to pets |
| Gardenia 'Kleim's Hardy' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of soil begins to dry, roughly every 4-7 days | Toxic to pets |
| Gardenia 'Radicans' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 4-7 days | Toxic to pets |
| Gardenia 'Veitchii' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 4-7 days | Toxic to pets |
| Geay's Pachypodium | Direct sun (at least 4-6 hours) | When the top half of the soil is dry during the growing season, roughly every 7-14 days in summer; minimal to none in winter | Toxic to pets |
| Geranium (pelargonium) | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 5-10 days | Toxic to pets |
| Giant Autumn Daffodil | Direct sun (at least 4-6 hours) | Minimal water during autumn–spring growth; bone dry in summer | Toxic to pets |
| Giant Bucephalandra | Medium indirect light (a couple of metres from a window) | Keep substrate consistently moist (emersed) or fully submerged (aquatic); do not allow to dry out | Toxic to pets |
| Giant Chincherinchee | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days during active growth | Toxic to pets |
| Giant Dioon | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in summer; every 3–4 weeks in winter | Toxic to pets |
| Giant 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 | 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 Pineapple Lily | Direct sun (at least 4-6 hours) | Regular during the growing season; minimal in winter dormancy | Toxic to pets |
| Giant Pineapple Lily | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry during active growth, roughly every 7-14 days | Toxic to pets |
| Giant Snowdrop | Bright indirect light (just back from a sunny window) | Regular moisture during growth; tolerates drier summer dormancy than G. nivalis | Toxic to pets |
| Giant Spider Lily | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in the growing season | Toxic to pets |
| Giant Taro | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm is dry, often every 4-7 days | Toxic to pets |
| Giant Thevetia | Direct sun (at least 4-6 hours) | Every 7–14 days once established; water deeply during the growing season | Toxic to pets |
| Giant Typhonium | Medium indirect light (a couple of metres from a window) | Regularly during the growing season; reduce through autumn and winter | Toxic to pets |
| Giant White Bird of Paradise | Bright indirect light (just back from a sunny window) | When the top 5–7 cm of soil feel dry; approximately every 7–14 days in summer, less in winter | Toxic to pets |
| 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 'Impressive' | Direct sun (at least 4-6 hours) | Keep evenly moist during growth, roughly 25 mm per week in dry spells | 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 |
| Gladiolus 'Traderhorn' | Direct sun (at least 4-6 hours) | Roughly weekly, 25mm (1 inch) per week during active growth and budding | Toxic to pets |
| Gladiolus callianthus | Direct sun (at least 4-6 hours) | Weekly during growth, keeping soil moist but never sodden | Toxic to pets |
| Glyceria maxima 'Variegata' | Direct sun (at least 4-6 hours) | Keep constantly moist to shallowly submerged | Toxic to pets |
| Gold Coast Juniper | Direct sun (at least 4-6 hours) | Water deeply through the first season; thereafter mainly in prolonged drought | Toxic to pets |
| Gold Dust Dracaena | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Gold Heart Bleeding Heart | Medium indirect light (a couple of metres from a window) | Weekly during the growing season, reducing as foliage dies back in summer | Toxic to pets |
| Gold Tooth Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in growth | Toxic to pets |
| Golden 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 Chalice Vine | Direct sun (at least 4-6 hours) | Weekly in active growth; every 2–3 weeks in winter | Toxic to pets |
| Golden Columbine | Bright indirect light (just back from a sunny window) | Once or twice a week during active growth; drought-tolerant once established | 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 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-rayed Lily | Direct sun (at least 4-6 hours) | When top 3 cm of soil is dry | Toxic to pets |
| Gollum Jade | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Gourd-leaf Begonia | Medium indirect light (a couple of metres from a window) | Every 6–9 days in spring and summer; every 12–16 days in winter | Toxic to pets |
| Gout Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; sparingly (every 3–4 weeks) in winter | Toxic to pets |
| 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-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 |
| Grass-leaved Zamia | Direct sun (at least 4-6 hours) | Every 14–21 days in growing season; monthly or less in winter | Toxic to pets |
| Great Expectations Hosta | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Great Solomon's Seal | Low light (north window or shaded room) | Every 4-6 days in active growth; drought-tolerant once established | Toxic to pets |
| Greater Periwinkle | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; every 10–14 days once established | Toxic to pets |
| Greater Spearwort | Direct sun (at least 4-6 hours) | Shallow to moderate water depth: 10–45 cm | Toxic to pets |
| Grecian Windflower | Bright indirect light (just back from a sunny window) | Moderate in spring, dry during summer dormancy | Toxic to pets |
| Greek Cyclamen | Bright indirect light (just back from a sunny window) | Dry in summer dormancy; moderate during autumn and winter growth | Toxic to pets |
| Green Arrow Arum | Direct sun (at least 4-6 hours) | Permanent standing water or consistently saturated soil; never allow to dry out | Toxic to pets |
| Green Comet Milkweed | Bright indirect light (just back from a sunny window) | Low; highly drought-tolerant once established | Toxic to pets |
| Green Dragon | Medium indirect light (a couple of metres from a window) | Regularly during spring and summer growing season | Toxic to pets |
| Green Gem Boxwood | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Green Milkweed | Direct sun (at least 4-6 hours) | Low to moderate; every 1–2 weeks once established | Toxic to pets |
| Green Snowdrop | Bright indirect light (just back from a sunny window) | Relies on natural rainfall during the growing season; keep moist during autumn planting and winter–spring growth | Toxic to pets |
| Green Velvet Boxwood | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Green-tip Forest Lily | Bright indirect light (just back from a sunny window) | Water moderately in spring and summer; reduce to barely moist in autumn and winter. | Toxic to pets |
| Greig's Tulip | Direct sun (at least 4-6 hours) | Rainfall-dependent during growth; needs dry summer dormancy | Toxic to pets |
| Griffith's Begonia | Medium indirect light (a couple of metres from a window) | When the top 2–3 cm of compost feel dry | Toxic to pets |
| Grigua Cycad | Direct sun (at least 4-6 hours) | Every 21–30 days; very drought-tolerant | Toxic to pets |
| Grisebach's Sword Plant | Medium indirect light (a couple of metres from a window) | Submerged aquatic — 20-30% weekly water changes keep nutrients and water quality stable. | 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 |
| Guernsey Lily | Direct sun (at least 4-6 hours) | Completely dry in summer; begin watering in late summer as flower spikes emerge; water regularly until foliage dies back in late spring | Toxic to pets |
| Gum Palm | Bright indirect light (just back from a sunny window) | When the top 4-5 cm of mix is dry, every 8-12 days in growth | Toxic to pets |
| Hairy Hydrangea | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil feels dry, roughly every 5-7 days in summer | Toxic to pets |
| Hairy Primrose | Bright indirect light (just back from a sunny window) | Regularly during active growth (spring–autumn); sparingly in winter | Toxic to pets |
| Hairy Rattleweed | Direct sun (at least 4-6 hours) | Low; allow soil to dry between waterings | Toxic to pets |
| Hairy St John's-wort | Medium indirect light (a couple of metres from a window) | Moderate — water when the top 2–3 cm of soil is dry | Toxic to pets |
| Hairy-Leaf Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of compost feel dry | Toxic to pets |
| Hairy-leaf Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the active (cool) season; minimal or none in summer | Toxic to pets |
| Hall Totara | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days for young plants | Toxic to pets |
| Hallae's Nephthytis | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of soil dries out, approximately every 7-10 days | Toxic to pets |
| Hardy Cyclamen | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry during active growth (autumn-spring); withhold water during summer dormancy | Toxic to pets |
| 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 |
| Hawaii Blue Flossflower | Direct sun (at least 4-6 hours) | When the top 2 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Hayata's Stephania | Bright indirect light (just back from a sunny window) | Every 7–10 days during growing season; withhold in winter dormancy | Toxic to pets |
| Heart-leaved Homalomena | Low light (north window or shaded room) | Every 10–14 days in growing season; every 14–21 days in winter | Toxic to pets |
| Heartleaf philodendron | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Heavenly blue morning glory | Direct sun (at least 4-6 hours) | Once or twice a week in dry periods; reduce once established | Toxic to pets |
| Heavy Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly every 7-10 days in growth | 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 'Glacier' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Hedera helix 'Goldheart' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Hedera helix 'Ivalace' | 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 |
| 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 'Coppelia' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in dry summer weather | Toxic to pets |
| Helenium 'Floretan' | Direct sun (at least 4-6 hours) | Every 5-7 days; maintain consistent soil moisture through summer | Toxic to pets |
| Helenium 'Helbro' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water every 3-5 days during dry summer spells | Toxic to pets |
| Helenium 'Moerheim Beauty' | Direct sun (at least 4-6 hours) | Keep evenly moist; water every 4-7 days, more often in dry heat | Toxic to pets |
| Helenium 'Pumilum Magnificum' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in dry weather | Toxic to pets |
| Helenium 'Riverton Beauty' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in warm, dry weather | Toxic to pets |
| Helenium 'Rubinzwerg' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days during dry summer spells | Toxic to pets |
| Helenium 'Sahin's Early Flowerer' | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 4-7 days, more in heat | Toxic to pets |
| Helenium 'Sahin's Early Flowerer' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days during dry summer spells | Toxic to pets |
| Helenium 'Short and Sassy' | Direct sun (at least 4-6 hours) | Every 5-7 days; do not allow soil to dry out completely during summer | Toxic to pets |
| Helenium 'Waldtraut' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water every 3-5 days during dry spells | Toxic to pets |
| Helenium 'Wyndley' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water every 3-5 days during dry spells | Toxic to pets |
| Hellebore | Medium indirect light (a couple of metres from a window) | Weekly watering until established | Toxic to pets |
| Hellebore 'Penny's Pink' | Medium indirect light (a couple of metres from a window) | Keep evenly moist during establishment and dry spells; established clumps are moderately drought-tolerant | Toxic to pets |
| Helleborus × hybridus | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry; roughly weekly in the first year, then only in dry spells once established | Toxic to pets |
| Helleborus foetidus | Medium indirect light (a couple of metres from a window) | When the top few centimetres of soil dry out; weekly while establishing, then rarely once settled | Toxic to pets |
| Helleborus orientalis 'Ivory Prince' | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry; weekly while establishing, then during dry spells | Toxic to pets |
| Helleri Holly | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 7-14 days during dry weather | Toxic to pets |
| Hemlock Water Dropwort | Direct sun (at least 4-6 hours) | Constantly wet; wetland marginal or in-water species | Toxic to pets |
| Hemlock Water Parsnip | Direct sun (at least 4-6 hours) | Continuously — must have saturated or inundated soil | 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 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's Trumpet | Direct sun (at least 4-6 hours) | Every 5-7 days in growth, every 14 days in winter | Toxic to pets |
| Hernando Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of compost feel dry | Toxic to pets |
| Hicksii Yew | Medium indirect light (a couple of metres from a window) | Every 7-10 days while establishing, then as needed | Toxic to pets |
| Hikuri | Direct sun (at least 4-6 hours) | Sparingly: only when soil is fully dry, roughly every 2-3 weeks in summer, none in winter | Toxic to pets |
| Himalayan Cotoneaster | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; established plants are drought-tolerant once settled | Toxic to pets |
| Himalayan pieris | Bright indirect light (just back from a sunny window) | Regular; keep consistently moist | Toxic to pets |
| Himalayan Pieris Wakehurst | Bright indirect light (just back from a sunny window) | Water every 7–10 days; do not allow to dry out, particularly during spring growth flush | Toxic to pets |
| Himalayan Yew | Medium indirect light (a couple of metres from a window) | Weekly during establishment; every 1–2 weeks once established | Toxic to pets |
| Histrioides Iris | Direct sun (at least 4-6 hours) | Moderate in late winter and spring; dry in summer | Toxic to pets |
| Hobbit Jade | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is fully dry, about every 2-3 weeks; less in winter | Toxic to pets |
| Holger Juniper | Direct sun (at least 4-6 hours) | Water regularly the first season; afterward only in extended drought | Toxic to pets |
| Hollow-Rooted Fumewort | Medium indirect light (a couple of metres from a window) | Rainfall-dependent during spring growth; completely dry in summer dormancy | Toxic to pets |
| Holmgren's Dioon | Direct sun (at least 4-6 hours) | Every 3–5 weeks in the growing season; monthly or less in winter | Toxic to pets |
| Holton's Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost feel dry | Toxic to pets |
| Homalomena 'Emerald Gem' | Medium indirect light (a couple of metres from a window) | When the top 3 cm of soil is dry, roughly every 6-9 days | Toxic to pets |
| Homalomena 'Maggy' (Shield Plant) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (top inch) of soil is dry | Toxic to pets |
| Homalomena Lindenii | 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 |
| Homalomena Maggy | 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 |
| Homalomena Selby | 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 |
| Homalomena Sp. Selby | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Homalomena wallisii | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Honey Garlic | Bright indirect light (just back from a sunny window) | Low; rainfall usually sufficient once established in the UK | Toxic to pets |
| Hooded-leaf Pelargonium | Direct sun (at least 4-6 hours) | Water when the top 3–4 cm of compost is dry, approximately every 7–12 days in the growing season; keep barely moist in winter | Toxic to pets |
| Hoogendorn Holly | Direct sun (at least 4-6 hours) | Weekly deep watering when young, then every 7-14 days in dry weather | Toxic to pets |
| Hooker's Anchomanes | Medium indirect light (a couple of metres from a window) | Every 7–10 days during growth; completely dry during dormancy | Toxic to pets |
| Hookeri Anthurium | 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 |
| Hoop Petticoat Daffodil | Direct sun (at least 4-6 hours) | Regular during active growth; dry in summer dormancy | Toxic to pets |
| Hoop Petticoat Daffodil | Direct sun (at least 4-6 hours) | Once per week during spring growth; withhold irrigation after foliage yellows | Toxic to pets |
| 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 |
| Hope's Cycad | Bright indirect light (just back from a sunny window) | Weekly in summer; every 10–14 days in winter | Toxic to pets |
| Horned Tulip | Direct sun (at least 4-6 hours) | Moderate during active growth; dry in summer | Toxic to pets |
| Horombe Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; none from late autumn to mid-spring | Toxic to pets |
| Horsfield's Sauromatum | Bright indirect light (just back from a sunny window) | Moderately moist during active growth; dry dormancy in winter | Toxic to pets |
| Hosta | Medium indirect light (a couple of metres from a window) | Keep evenly moist; roughly weekly in the ground, more often in pots or heat | Toxic to pets |
| Hosta 'Abiqua Drinking Gourd' | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 6-8 days in summer | Toxic to pets |
| Hosta 'August Moon' | Medium indirect light (a couple of metres from a window) | When the top 3 cm of soil is dry, roughly every 6-7 days in summer | Toxic to pets |
| Hosta 'Big Daddy' | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 6-8 days in summer | Toxic to pets |
| Hosta 'Blue Angel' | Medium indirect light (a couple of metres from a window) | Every 5-7 days during the growing season, or when the top 3-5 cm of soil is drying | Toxic to pets |
| Hosta 'Blue Mammoth' | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Hosta 'Bressingham Blue' | Low light (north window or shaded room) | When the top 3 cm of soil is dry, roughly every 7 days in summer | Toxic to pets |
| Hosta 'Color Festival' | 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 'Curly Fries' | 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 'Diamond Tiara' | 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 'El Nino' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7 days during the growing season | Toxic to pets |
| Hosta 'Elegans' | 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 'Empress Wu' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Toxic to pets |
| Hosta 'Fire Island' | 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 'First Frost' | Medium indirect light (a couple of metres from a window) | When top 2-3 cm of soil begins to dry, about every 5-7 days, more in heat | Toxic to pets |
| 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 'Fragrant Bouquet' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 6-7 days in summer | Toxic to pets |
| Hosta 'Frances Williams' | Medium indirect light (a couple of metres from a window) | Every 5-7 days in the growing season, or when the top 3-5 cm of soil is drying out | Toxic to pets |
| Hosta 'Fun and Games' | 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 '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 'Grand Tiara' | 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 'Great Expectations' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Toxic to pets |
| Hosta 'Guacamole' | 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 'Halcyon Blue' | Low light (north window or shaded room) | When the top 3 cm of soil is dry, roughly every 7-10 days in summer | Toxic to pets |
| Hosta 'Halcyon' | 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 'Invincible' | 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 'Island Charm' | 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 'June' | Medium indirect light (a couple of metres from a window) | When top 2-3 cm of soil begins to dry, about every 5-7 days, more in heat | Toxic to pets |
| Hosta 'Krossa Regal' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7 days during the growing season | 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 'Love Pat' | Low light (north window or shaded room) | When the top 3 cm of soil is dry, roughly every 6-8 days in summer | Toxic to pets |
| Hosta 'Midnight Rider' | 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 'Night Before Christmas' | 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 'On Stage' | 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 '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 'Paul Revere' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Toxic to pets |
| Hosta '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 'Praying Hands' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7 days in summer | Toxic to pets |
| Hosta 'Regal Splendor' | 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 'Remember Me' | 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 'Revolution' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Toxic to pets |
| Hosta '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 'Sagae' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Hosta '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 'Something Different' | 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 '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 'Sum and Substance' | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, about every 5-7 days; more in heat | Toxic to pets |
| Hosta 'Sum and Substance' | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Hosta 'Touch of Class' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7 days during the growing season | Toxic to pets |
| Hosta 'Twilight' | 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 'Undulata Albomarginata' | 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 '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 |
| Hosta 'Wheel of Fortune' | 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 'Wide Brim' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Toxic to pets |
| Hosta sieboldiana 'Elegans' | Low light (north window or shaded room) | When top 2-3 cm of soil begins to dry, about every 5-7 days, more in heat | Toxic to pets |
| Hound's-tongue | Direct sun (at least 4-6 hours) | Rarely, once established | Toxic to pets |
| Humboldt's Caladium | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in active growth | 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 |
| Hyacinth | Bright indirect light (just back from a sunny window) | Weekly watering during growth | Toxic to pets |
| Hyacinthus orientalis 'Carnegie' | Direct sun (at least 4-6 hours) | Moist through growth and flowering; reduce after foliage dies back | Toxic to pets |
| Hyacinthus orientalis 'City of Haarlem' | Direct sun (at least 4-6 hours) | Moist during growth and flowering; reduce after foliage dies back | Toxic to pets |
| Hyacinthus orientalis 'Delft Blue' | Direct sun (at least 4-6 hours) | Keep soil moist during growth and flowering; reduce sharply after foliage dies back | Toxic to pets |
| Hyacinthus orientalis 'Jan Bos' | Direct sun (at least 4-6 hours) | Moist through growth and flowering; reduce after foliage dies back | Toxic to pets |
| Hyacinthus orientalis 'Woodstock' | Direct sun (at least 4-6 hours) | Moist during growth and flowering; much drier after dormancy sets in | Toxic to pets |
| Hydrangea | Bright indirect light (just back from a sunny window) | Deep watering 1-2 times per week, more in heat | Toxic to pets |
| Hydrangea 'Annabelle' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 2-3 times weekly in summer, more in heat or drought | Toxic to pets |
| Hydrangea 'Endless Summer' | Bright indirect light (just back from a sunny window) | Keep consistently moist; water deeply 2-3 times weekly in heat | Toxic to pets |
| Hydrangea 'Endless Summer' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 2-3 times weekly in summer heat, more for containers | Toxic to pets |
| Hydrangea 'Incrediball' | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, about 2-3 times per week in summer | Toxic to pets |
| Hydrangea 'Limelight' | Direct sun (at least 4-6 hours) | Keep soil moist while establishing; water deeply once or twice weekly in summer, less once established | Toxic to pets |
| Hydrangea 'Little Lime' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, about 1-2 times per week | Toxic to pets |
| Hydrangea 'PeeWee' | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, about once per week | Toxic to pets |
| Hydrangea 'Pinky Winky' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, about 1-2 times per week | Toxic to pets |
| Hydrangea 'Vanilla Strawberry' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly 1-2 times per week | Toxic to pets |
| Hydrangea aspera 'Villosa' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply every 5-7 days in dry summer spells | Toxic to pets |
| Ice Follies Daffodil | Direct sun (at least 4-6 hours) | Moderate during autumn–spring; dry in summer dormancy | Toxic to pets |
| 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 |
| Impala Lily | Direct sun (at least 4-6 hours) | Every 7–10 days in warm growing season; withhold almost entirely during dormancy (autumn–late winter) | Toxic to pets |
| Imperial Green | 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 |
| 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 |
| Ipomoea batatas 'Blackie' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often every 2-3 days in containers in summer | Toxic to pets |
| Ipomoea lobata | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-6 days in summer | Toxic to pets |
| Ipomoea nil 'Scarlett O'Hara' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 3-5 days in summer | Toxic to pets |
| Ipomoea purpurea | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 3-5 days in summer heat | Toxic to pets |
| Ipomoea quamoclit | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 4-6 days in summer | Toxic to pets |
| Ipomoea tricolor 'Heavenly Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days in warm weather | Toxic to pets |
| Irene Nuss Cane Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 5-7 days in summer | Toxic to pets |
| Iris | Direct sun (at least 4-6 hours) | Weekly watering during growth | Toxic to pets |
| Iris 'Benton Susan' | Direct sun (at least 4-6 hours) | Water at planting and during establishment, then only in prolonged drought; established clumps are drought-tolerant | Toxic to pets |
| Iris 'Black Gamecock' | Direct sun (at least 4-6 hours) | Keep consistently wet; tolerates standing water and never fully dry out | Toxic to pets |
| Iris '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 'Immortality' | Direct sun (at least 4-6 hours) | Keep evenly moist through spring and late summer to support rebloom; avoid waterlogging | Toxic to pets |
| Iris 'Jane Phillips' | Direct sun (at least 4-6 hours) | Water deeply during spring growth and after planting; keep drier in summer | Toxic to pets |
| Iris 'Katharine Hodgkin' | Direct sun (at least 4-6 hours) | Water during autumn-to-spring growth; keep dry in summer dormancy | Toxic to pets |
| Iris ensata | Direct sun (at least 4-6 hours) | Keep soil constantly moist in spring and summer; drier in winter | Toxic to pets |
| Iris laevigata | Direct sun (at least 4-6 hours) | Permanently wet; thrives in 0-15 cm of standing water year-round | 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 |
| Iris reticulata 'Harmony' | Direct sun (at least 4-6 hours) | Water during autumn-to-spring growth; keep dry in summer dormancy | Toxic to pets |
| Iris versicolor | Direct sun (at least 4-6 hours) | Keep consistently wet to shallowly submerged | Toxic to pets |
| Iris virginica | Direct sun (at least 4-6 hours) | Keep wet to shallowly submerged year-round | 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 |
| Iron Cross Begonia | Bright indirect light (just back from a sunny window) | When the top 2.5cm of compost dries, roughly weekly | Toxic to pets |
| Isalo Adenia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; withhold almost entirely in winter | Toxic to pets |
| Italian Gladiolus | Direct sun (at least 4-6 hours) | Moderate during growth; dry when dormant | Toxic to pets |
| Itoh Peony 'Bartzella' | Direct sun (at least 4-6 hours) | Deeply once a week during growth and budding; established plants tolerate short dry spells | Toxic to pets |
| Ivory Tree | Bright indirect light (just back from a sunny window) | Every 4–7 days; allow topsoil to dry slightly between waterings | Toxic to pets |
| Ivy-Leaved Cyclamen | Medium indirect light (a couple of metres from a window) | Drought-tolerant once established; rely entirely on natural rainfall | Toxic to pets |
| ivy-leaved scindapsus | Medium indirect light (a couple of metres from a window) | Every 7–14 days depending on season and light | Toxic to pets |
| Ivyleaf morning glory | Direct sun (at least 4-6 hours) | Once or twice a week; allow soil to dry slightly between waterings | Toxic to pets |
| Jack-in-the-Pulpit | Low light (north window or shaded room) | Keep the soil consistently moist throughout the growing season, watering whenever the surface begins to dry; it tolerates short dry spells but resents drought. | Toxic to pets |
| Jacqueline Postill Daphne | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in the growing season, allowing the top 3-5 cm to dry between waterings | Toxic to pets |
| Jade plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| Jagged Lavender | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–4 weeks in winter | Toxic to pets |
| Japanese Anemone 'Honorine Jobert' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Japanese Apricot | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil dries, often daily in summer | Toxic to pets |
| Japanese box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Japanese Cobra Lily | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist during the growing season (spring to early summer); cease watering during summer dormancy | Toxic to pets |
| Japanese Flowering Cherry Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil starts to dry, often daily in summer | Toxic to pets |
| Japanese Garden Juniper | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is just dry, frequently in summer | Toxic to pets |
| Japanese Holly 'Sky Pencil' | Bright indirect light (just back from a sunny window) | When the top few centimetres of soil dry; about weekly in summer | Toxic to pets |
| Japanese 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 | Bright indirect light (just back from a sunny window) | Keep evenly moist; water weekly in dry spells and never let it dry out | Toxic to pets |
| Japanese Pieris 'Forest Flame' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water weekly during dry spells, more in containers | Toxic to pets |
| Japanese Pieris 'Mountain Fire' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry; keep evenly moist, particularly while establishing | Toxic to pets |
| Japanese Pieris Flamingo | Bright indirect light (just back from a sunny window) | Water deeply every 7–10 days; more frequently in hot, dry spells | Toxic to pets |
| Japanese 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 Show Lily | Bright indirect light (just back from a sunny window) | Regular during active growth, roughly every 5–7 days in dry spells; reduce after foliage dies back | Toxic to pets |
| Joe-Pye Weed | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in dry weather | Toxic to pets |
| Johnston's Cyrtosperma | Bright indirect light (just back from a sunny window) | Keep permanently moist to waterlogged; does not tolerate drought | Toxic to pets |
| Jonquil | Direct sun (at least 4-6 hours) | Moderate during autumn–spring growth; very dry during summer dormancy | 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 |
| Josephine's Lily | Direct sun (at least 4-6 hours) | Water from flower-scape emergence (late summer) through leaf period (winter–spring); completely dry from late spring to late summer | Toxic to pets |
| Juno Iris | Direct sun (at least 4-6 hours) | Moderate from early spring to late spring; completely dry mid-summer to mid-autumn | Toxic to pets |
| Kaapsehoop Cycad | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in summer; every 3–4 weeks in winter | Toxic to pets |
| Kalanchoe | Direct sun (at least 4-6 hours) | When the soil is dry, every 10-14 days | Toxic to pets |
| Kalanchoe 'Calandiva' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is fully dry, roughly every 7-14 days | Toxic to pets |
| Kalanchoe 'Kerinci' | Bright indirect light (just back from a sunny window) | When the soil is dry to about halfway down, every 10-14 days | Toxic to pets |
| Kalanchoe Beharensis | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Eriophylla | Bright indirect light (just back from a sunny window) | When the soil is dry to a depth of 3-4 cm, roughly every 10-14 days in growth | Toxic to pets |
| Kalanchoe Fedtschenkoi | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, about every 1-2 weeks in summer, every 3-4 weeks in winter | Toxic to pets |
| Kalanchoe Longiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Kalanchoe Marmorata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 2-3 weeks in winter | Toxic to pets |
| Kalanchoe Millotii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Kalanchoe Orgyalis | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Pumila | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 1-2 weeks in summer, every 3-4 weeks in winter | Toxic to pets |
| Kalanchoe Rhombopilosa | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Synsepala | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Kalanchoe Thyrsiflora | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Kalanchoe Tomentosa 'Chocolate Soldier' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Karoo Cycad | Direct sun (at least 4-6 hours) | Every 21–30 days; highly drought-tolerant once established | Toxic to pets |
| Keisk's Leucothoe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; sensitive to both drought and waterlogging | Toxic to pets |
| Keiske's Leucothoe | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season, less in winter | Toxic to pets |
| Kellerman's Begonia | Bright indirect light (just back from a sunny window) | When the top third of the soil is dry | 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 |
| Kerala Lagenandra | Medium indirect light (a couple of metres from a window) | Permanently saturated or submerged substrate; never allow to dry | 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 |
| King Alfred Daffodil | Direct sun (at least 4-6 hours) | Moderate during growing season; dry during summer dormancy | Toxic to pets |
| King Anthurium | Bright indirect light (just back from a sunny window) | when top 2-3 cm dry | Toxic to pets |
| King of Hearts Bleeding Heart | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Toxic to pets |
| Knotweed Begonia | Bright indirect light (just back from a sunny window) | Every 5–8 days in the growing season; every 10–14 days in winter | Toxic to pets |
| Korean box | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Toxic to pets |
| Korean rhododendron | Bright indirect light (just back from a sunny window) | Weekly during establishment and summer; reduce to monthly when dormant | Toxic to pets |
| Krossa Regal Hosta | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Kurume Azalea 'Hino Crimson' | Bright indirect light (just back from a sunny window) | About weekly once established, more in heat; water when the top 2-3 cm of soil is dry | Toxic to pets |
| Küster's Ceratozamia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–5 weeks in winter | Toxic to pets |
| Laburnum × watereri 'Vossii' | Direct sun (at least 4-6 hours) | Water weekly through the first two seasons, then only in prolonged drought | Toxic to pets |
| Lacandon Zamia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 2–3 weeks in winter | Toxic to pets |
| Lace Aloe | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Lacecap Hydrangea | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of soil is dry, often several times a week in heat | Toxic to pets |
| Lady of the Night | Bright indirect light (just back from a sunny window) | Every 5–7 days; adjust based on season and soil moisture | Toxic to pets |
| Lady Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| Lakeside Black Satin Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, roughly every 5-7 days during active growth | Toxic to pets |
| Lamance Iris | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; tolerates seasonal flooding of 5–10 cm (2–4 in) for short periods. | Toxic to pets |
| Lamb 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 |
| Lamprocapnos spectabilis 'Alba' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil begins to dry, roughly every 5-7 days in spring | Toxic to pets |
| Lamprocapnos spectabilis 'Gold Heart' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil begins to dry, roughly every 5-7 days in spring | Toxic to pets |
| Lanceolate Anubias | Low light (north window or shaded room) | Permanently submerged or emersed aquatic plant | 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 Yellow Foxglove | Bright indirect light (just back from a sunny window) | Once or twice a week in dry spells; consistent moisture is important for longevity | Toxic to pets |
| Large-flowered Rain Lily | Direct sun (at least 4-6 hours) | Allow partial drying between waterings; a dry-wet cycle triggers blooming | Toxic to pets |
| Large-flowered Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn–spring); monthly or less in summer | Toxic to pets |
| Larkspur | Direct sun (at least 4-6 hours) | Every 5–7 days | Toxic to pets |
| Lasia spinosa | Bright indirect light (just back from a sunny window) | Keep constantly wet to waterlogged | Toxic to pets |
| Late Tulip | Direct sun (at least 4-6 hours) | Rainfall-dependent during spring growth; needs dry summer rest | Toxic to pets |
| Lauren's Grape peony poppy | Direct sun (at least 4-6 hours) | Weekly during establishment; every 10–14 days once plants are growing strongly | Toxic to pets |
| Lavender | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 10-14 days | Toxic to pets |
| Leatherleaf | Bright indirect light (just back from a sunny window) | Consistently wet to moist — never allow to dry out | Toxic to pets |
| Lepidozamia Peroffskyana | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days in growth, less in winter | Toxic to pets |
| Lesser Begonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth, every 10–14 days in winter | Toxic to pets |
| Lesser Periwinkle | Medium indirect light (a couple of metres from a window) | Weekly during establishment; largely self-sufficient in average rainfall climates | Toxic to pets |
| Lesser Spearwort | Direct sun (at least 4-6 hours) | Saturated mud to 5 cm standing water | Toxic to pets |
| Lesser Theriophonum | Bright indirect light (just back from a sunny window) | Regular watering during active monsoon-season growth; completely dry in dormancy | Toxic to pets |
| Leucanthemum × superbum 'Alaska' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly weekly; more in extended heat | Toxic to pets |
| Leucanthemum × superbum 'Becky' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly weekly; more in prolonged heat | Toxic to pets |
| Leucanthemum × superbum 'Silver Princess' | Direct sun (at least 4-6 hours) | About once a week, when the top 3-4 cm of soil is dry | Toxic to pets |
| Leucanthemum × superbum '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 |
| Leucanthemum × superbum 'Wirral Supreme' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about weekly; more during drought | Toxic to pets |
| 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 'Casa Blanca' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, about weekly during active growth | 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 'Dizzy' | Direct sun (at least 4-6 hours) | Keep evenly moist in growth, about weekly; never waterlogged | Toxic to pets |
| Lilium 'Matrix' | Direct sun (at least 4-6 hours) | Keep evenly moist through growth and bloom, about weekly; avoid waterlogging | Toxic to pets |
| Lilium 'Regale' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, roughly weekly during active growth | Toxic to pets |
| Lilium 'Stargazer' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, roughly weekly during growth and flowering | Toxic to pets |
| Lilium 'Tiny Bee' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, roughly weekly; more often in pots | Toxic to pets |
| Lilium lancifolium | Direct sun (at least 4-6 hours) | Keep evenly moist in active growth, roughly weekly; never waterlogged | Toxic to pets |
| Lily of the valley | Low light (north window or shaded room) | Weekly watering | Toxic to pets |
| Little Heath pieris | Bright indirect light (just back from a sunny window) | Weekly; maintain consistent moisture | Toxic to pets |
| Llano-Carti Road Syngonium | 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 | Toxic to pets |
| Lobelia cardinalis | Direct sun (at least 4-6 hours) | Keep consistently moist to wet; never let it dry out | Toxic to pets |
| Lobelia erinus 'Cascade Blue' | Direct sun (at least 4-6 hours) | Keep consistently moist; check baskets daily in warm weather | Toxic to pets |
| Lobelia erinus 'Riviera Lilac' | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the surface starts to dry | 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 |
| Lonesome Dove Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, about every 5-7 days during active growth | Toxic to pets |
| Long-Flowered Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during the growing season; fortnightly in winter | Toxic to pets |
| Long-leaved Pelargonium | Direct sun (at least 4-6 hours) | Water moderately during active growth (autumn–spring); withhold almost entirely in summer dormancy | Toxic to pets |
| Long-Stalked Pothos | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| 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 |
| 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 |
| Lopsided Begonia | Bright indirect light (just back from a sunny window) | Every 6–8 days during active growth, reduced to every 12–14 days in winter | Toxic to pets |
| Lords-and-Ladies | Low light (north window or shaded room) | Weekly during active growth (autumn–spring); reduce in summer dormancy | Toxic to pets |
| Lossow's Jensenobotrya | Bright indirect light (just back from a sunny window) | Water sparingly year-round, every 2–3 weeks | Toxic to pets |
| Love-in-a-mist | Direct sun (at least 4-6 hours) | Once or twice a week; established plants rarely need supplemental watering in cool, moist climates | Toxic to pets |
| Low Shield Plant | Low light (north window or shaded room) | Every 10–14 days; less in winter | Toxic to pets |
| lucent scindapsus | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; every 14 days in winter | Toxic to pets |
| Lucky bamboo | Medium indirect light (a couple of metres from a window) | Change water every 1-2 weeks if grown hydroponically | Toxic to pets |
| Lucky Nut | Direct sun (at least 4-6 hours) | Every 5–10 days during establishment; drought-tolerant once established | Toxic to pets |
| Lugard's Monadenium | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Toxic to pets |
| Lupin 'The Governor' | 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 |
| Lupine | Direct sun (at least 4-6 hours) | Weekly watering | Toxic to pets |
| Lupinus 'Chandelier' | Direct sun (at least 4-6 hours) | Every 5-7 days; keep the soil evenly moist, never sodden | Toxic to pets |
| Lupinus 'Manhattan Lights' | Direct sun (at least 4-6 hours) | Every 5-7 days; keep soil consistently moist but well-drained | Toxic to pets |
| Lupinus 'Masterpiece' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply once or twice weekly in dry spells | Toxic to pets |
| Lupinus 'Tequila Flame' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; deep water once or twice weekly when dry | Toxic to pets |
| Lupinus 'The Governor' | Direct sun (at least 4-6 hours) | Every 5-7 days; keep soil consistently moist, never waterlogged | Toxic to pets |
| Lupinus polyphyllus 'Gallery Blue' | Direct sun (at least 4-6 hours) | Every 5-7 days; maintain evenly moist soil without waterlogging | Toxic to pets |
| Lurida Cast Iron Plant | Low light (north window or shaded room) | When the top half of the soil is dry, roughly every 10-14 days | Toxic to pets |
| Luxurians Anthurium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (roughly the top 20-35%) of the mix dries out | 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 |
| Luzon Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry | Toxic to pets |
| Lydian Broom | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only to establish | Toxic to pets |
| MacDonnell Ranges Cycad | Direct sun (at least 4-6 hours) | Every 3–4 weeks (established); monthly or less in winter | Toxic to pets |
| Macdougall's Begonia | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry | Toxic to pets |
| Madagascar Palm | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; once or twice monthly in winter | Toxic to pets |
| Madagascar Palm Geay | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; once or twice per month in winter | Toxic to pets |
| 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 |
| Madonna Lily | Direct sun (at least 4-6 hours) | Moderate; water during active growth, reduce as dormancy approaches | Toxic to pets |
| Magnificent Homalomena | Medium indirect light (a couple of metres from a window) | Every 10–14 days in growing season; every 14–21 days in winter | Toxic to pets |
| Magnificent Juno Iris | Direct sun (at least 4-6 hours) | Moderate in growth; dry in summer dormancy | Toxic to pets |
| Maleberry | Bright indirect light (just back from a sunny window) | Regular to frequent; prefers moist to wet conditions | Toxic to pets |
| Malus 'Profusion' | Direct sun (at least 4-6 hours) | Water regularly while establishing; mature trees need water only in prolonged drought | Toxic to pets |
| Malus 'Royalty' | Direct sun (at least 4-6 hours) | Water regularly for the first 2-3 years; established trees need water only in extended drought | Toxic to pets |
| Malus floribunda | Direct sun (at least 4-6 hours) | Water regularly during establishment; mature trees need water only in extended drought | Toxic to pets |
| Malus tschonoskii | Direct sun (at least 4-6 hours) | Water regularly for the first 2-3 years; established trees need water only in prolonged drought | Toxic to pets |
| Mammy Croton | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Manhattan Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Manica Cycad | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; every 3–4 weeks in winter | Toxic to pets |
| Manjula Pothos | Bright indirect light (just back from a sunny window) | When the top 25-50% of the mix is dry, roughly weekly | Toxic to pets |
| Mann's Culcasia | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of soil feels dry, roughly every 7-10 days | Toxic to pets |
| Many-flowered Schismatoglottis | Low light (north window or shaded room) | Every 7–10 days during active growth; less in cooler months | Toxic to pets |
| Many-pinnate Cycad | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–5 weeks in winter | Toxic to pets |
| Many-spiked Ixia | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry during active growth, roughly every 10-14 days | Toxic to pets |
| Marble queen pothos | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Maritime Zamia | Direct sun (at least 4-6 hours) | Every 14–21 days in the growing season; once a month or less in winter | Toxic to pets |
| Marsh Afrikaner | Direct sun (at least 4-6 hours) | Moderate during winter–spring growing season; withhold entirely once foliage dies back in summer | Toxic to pets |
| Martagon Lily | Medium indirect light (a couple of metres from a window) | When top 3–4 cm of soil feels dry | Toxic to pets |
| Martinezii Lily | Direct sun (at least 4-6 hours) | Dry in summer; moderate in winter-to-spring growth period | Toxic to pets |
| Matasano | Direct sun (at least 4-6 hours) | Every 2–3 weeks when young; highly drought-tolerant once established | Toxic to pets |
| Mauna Loa Peace Lily | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14 days in winter | Toxic to pets |
| Mauna Loa Peace Lily | Low light (north window or shaded room) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Mayapple | Low light (north window or shaded room) | 1–2 times per week during spring; reduce as plant enters summer dormancy | Toxic to pets |
| 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 Buttercup | Direct sun (at least 4-6 hours) | Naturally thrives in moist conditions; water weekly in dry spells | Toxic to pets |
| Meebold's Lagenandra | Low light (north window or shaded room) | Keep permanently moist to fully submerged; never dry out | Toxic to pets |
| Meebold's Lagenandra | Medium indirect light (a couple of metres from a window) | Keep permanently waterlogged or submerged; substrate must never dry out | Toxic to pets |
| Merola's Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; monthly or less in winter | Toxic to pets |
| Mexican Lily | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry during active growth, roughly every 7-10 days | Toxic to pets |
| Michaelovsky Fritillary | Direct sun (at least 4-6 hours) | Moderate during active growth in spring; withhold almost completely from midsummer through autumn | Toxic to pets |
| Micholitz's Cycad | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; once a month or less in winter | Toxic to pets |
| Minuteman Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, about every 5-7 days in the growing season | Toxic to pets |
| Miquel's Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks | Toxic to pets |
| Miranda's Ceratozamia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks | Toxic to pets |
| Mistletoe Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry | Toxic to pets |
| Mombasa Cycad | Direct sun (at least 4-6 hours) | Every 1–3 weeks in the growing season; every 4–6 weeks in winter | Toxic to pets |
| Monarch of the East | Bright indirect light (just back from a sunny window) | Minimal until potted and in growth; then water when the top 2-3 cm of soil is dry | Toxic to pets |
| Monstera | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera acacoyaguensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Acuminata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera adansonii (Swiss cheese vine) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 7-10 days in growth | Toxic to pets |
| Monstera Adansonii Archipelago | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Monstera Adansonii Mint | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Monstera Adansonii Wide Form | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Aurea | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Costaricensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Monstera Deliciosa Borsigiana | Bright indirect light (just back from a sunny window) | When the top 2-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Deliciosa Mint Variegata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Deliciosa Ronronensis | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Deliciosa Sport | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Monstera Esqueleto | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Esqueleto Variegata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Monstera Gracilis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Monstera Karstenianum Peru Variegata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Laniata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Monstera Lechleriana | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Nigrescens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Monstera obliqua | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of mix is dry | Toxic to pets |
| Monstera Obliqua Peru | Medium indirect light (a couple of metres from a window) | Keep evenly, lightly moist; check every 4-7 days | Toxic to pets |
| Monstera Peru | Bright indirect light (just back from a sunny window) | Every 7-12 days in spring/summer; every 14-21 days in winter | Toxic to pets |
| Monstera pinnatipartita | Bright indirect light (just back from a sunny window) | When the top 25-50% (roughly 2-3 inches) of the mix is dry | Toxic to pets |
| Monstera Pinnatipartita Variegata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Punctulata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Siltepecana | Bright indirect light (just back from a sunny window) | Roughly every 5-7 days in summer; less in winter | Toxic to pets |
| Monstera Spruceana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Toxic to pets |
| Monstera standleyana | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Standleyana Albo | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Monstera Standleyana Cobra | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Subpinnata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Monstera Tenuis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-9 days | Toxic to pets |
| Monstera Thai Constellation | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Monstera Tuberculata | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Monstera Xanthospatha | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-8 days | Toxic to pets |
| Monstera-Like Rhaphidophora | Bright indirect light (just back from a sunny window) | When the top 3–4 cm of soil feels dry, roughly every 7–14 days depending on season | Toxic to pets |
| Moonflower | Direct sun (at least 4-6 hours) | Weekly, more often in hot or dry spells | Toxic to pets |
| Moonshadow Euonymus | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Moore's Crinum | Medium indirect light (a couple of metres from a window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in the growing season | Toxic to pets |
| Moore's Cycad | Bright indirect light (just back from a sunny window) | Water every 2–4 weeks during active growth, sparingly in winter | Toxic to pets |
| Moore's Macrozamia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks | Toxic to pets |
| Mophead Hydrangea 'Cityline Paris' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often 2-3 times weekly in summer heat | Toxic to pets |
| Mops Dwarf Mountain Pine | Direct sun (at least 4-6 hours) | Every 10–14 days in summer once established; minimal in winter | Toxic to pets |
| 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 |
| Moses-in-the-Cradle (Oyster Plant) | Bright indirect light (just back from a sunny window) | When the top 1-2 inches (2.5-5 cm) of soil dry out | Toxic to pets |
| Moss rose | Direct sun (at least 4-6 hours) | When the soil is thoroughly dry, roughly every 7-10 days in summer | Toxic to pets |
| Mother of thousands | Bright indirect light (just back from a sunny window) | When the top 5 cm (2 in) of soil is dry, roughly every 1-2 weeks in growth | Toxic to pets |
| Mother of Thousands | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer | Toxic to pets |
| Mount Etna Broom | Direct sun (at least 4-6 hours) | Low — very drought-tolerant once established | Toxic to pets |
| Mountain Aloe | Direct sun (at least 4-6 hours) | When soil is fully dry, every 1-3 weeks in warm growth | Toxic to pets |
| Mountain Fetterbush | Bright indirect light (just back from a sunny window) | Water every 7–14 days; once established it is relatively drought-tolerant for a Pieris | Toxic to pets |
| Mountain Fire pieris | Bright indirect light (just back from a sunny window) | Weekly to bi-weekly depending on conditions | Toxic to pets |
| Mountain Hydrangea 'Bluebird' | Bright indirect light (just back from a sunny window) | About weekly, roughly 2.5 cm (1 inch) per week; water when the top 3-5 cm of soil is dry | Toxic to pets |
| mountain laurel | Bright indirect light (just back from a sunny window) | Weekly during establishment; water during dry spells once established | Toxic to pets |
| Mountain Laurel 'Olympic Fire' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry; keep evenly moist, especially in the first years | Toxic to pets |
| Mountain Pieris | Bright indirect light (just back from a sunny window) | Keep evenly moist; water weekly in dry weather and never allow drought stress | Toxic to pets |
| Mousetail Arum | Direct sun (at least 4-6 hours) | Water moderately during autumn-to-spring growth when the top few cm dry; keep dry through summer dormancy | Toxic to pets |
| Mpumalanga Cycad | Direct sun (at least 4-6 hours) | Every 3–5 weeks | Toxic to pets |
| Mulanje Cycad | Direct sun (at least 4-6 hours) | Weekly to fortnightly in summer; every 3–4 weeks in winter | Toxic to pets |
| Mulberry Wine prickly heath | Bright indirect light (just back from a sunny window) | Regular; keep consistently moist | Toxic to pets |
| Nandina Firepower | Direct sun (at least 4-6 hours) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Nandina Gulf Stream | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 10-14 days in dry spells | Toxic to pets |
| Nandina Harbour Dwarf | Bright indirect light (just back from a sunny window) | Weekly while establishing, then every 10-14 days once mature | Toxic to pets |
| Nandina Obsessed | Direct sun (at least 4-6 hours) | Weekly while establishing, then every 10-14 days once mature | 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 'Hawera' | Direct sun (at least 4-6 hours) | Keep soil evenly moist during active growth (autumn rooting through spring flowering); largely dry in 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 |
| Narcissus 'Jetfire' | Direct sun (at least 4-6 hours) | Moist during spring growth; drier through summer dormancy | Toxic to pets |
| Narcissus 'Minnow' | Direct sun (at least 4-6 hours) | Evenly moist while in leaf and flower; dry in summer dormancy | Toxic to pets |
| Narcissus 'Pipit' | Direct sun (at least 4-6 hours) | Moist in spring growth; drier through summer dormancy | Toxic to pets |
| Narcissus 'Tahiti' | Direct sun (at least 4-6 hours) | Moist in spring growth; drier through summer dormancy | Toxic to pets |
| Narcissus 'Tete-a-Tete' | Direct sun (at least 4-6 hours) | Moist in spring growth; drier through summer dormancy | Toxic to pets |
| Narcissus 'Thalia' | Direct sun (at least 4-6 hours) | Moist in spring growth; drier through summer dormancy | Toxic to pets |
| Narrow-Leaf Bird of Paradise | Direct sun (at least 4-6 hours) | Allow soil to dry well between waterings; approximately every 10–21 days in the growing season, very infrequent in winter | Toxic to pets |
| Narrow-leaf Dioon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month in winter | Toxic to pets |
| Narrow-leaf Zamia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks | Toxic to pets |
| 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 Biarum | Direct sun (at least 4-6 hours) | Light watering in autumn–spring active growth; completely dry in summer | Toxic to pets |
| Narrow-petal Frangipani | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter dormancy | Toxic to pets |
| Narrowleaf Milkweed | Direct sun (at least 4-6 hours) | Low; drought-tolerant, minimal supplemental watering | Toxic to pets |
| Natal Cycad | Direct sun (at least 4-6 hours) | Every 14–21 days (allow soil to dry between waterings) | Toxic to pets |
| Natal Grass Cycad | Medium indirect light (a couple of metres from a window) | Water when the top 2–3 cm of soil is dry, typically every 1–2 weeks in summer | Toxic to pets |
| Natal Lily | Bright indirect light (just back from a sunny window) | Every 7–10 days in spring and summer; sparingly (every 3–4 weeks) during the winter rest | Toxic to pets |
| Neglected Pink | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry between waterings | Toxic to pets |
| Neon pothos | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Netted Iris | Direct sun (at least 4-6 hours) | Low — dry in summer dormancy; moderate when in growth | Toxic to pets |
| Nicotiana × sanderae 'Starmaker Lime' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Nicotiana alata 'Perfume Deep Purple' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Nicotiana sylvestris | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days | Toxic to pets |
| Night-blooming Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce to every 10–14 days in cooler months | Toxic to pets |
| Nikko Blue Bigleaf Hydrangea | Bright indirect light (just back from a sunny window) | When the top 3–5 cm of soil is dry, roughly every 3–5 days in summer; reduce in winter | Toxic to pets |
| Nikko bog rosemary | Bright indirect light (just back from a sunny window) | Consistently moist; never dry out | 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 |
| Normanbya Cycad | Bright indirect light (just back from a sunny window) | Every 7–14 days in growing season; every 14–21 days in winter | Toxic to pets |
| Norstog's Ceratozamia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–5 weeks in winter | Toxic to pets |
| Oakleaf Croton | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Oakleaf Hydrangea | Bright indirect light (just back from a sunny window) | Keep soil moist while establishing; then water deeply during dry spells, roughly weekly in summer heat | Toxic to pets |
| Oakleaf Hydrangea 'Snow Queen' | Bright indirect light (just back from a sunny window) | Roughly weekly, about 2.5 cm (1 inch) per week while establishing; deep-soak when the top 5 cm of soil dries | Toxic to pets |
| 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 |
| Oersted's Dieffenbachia | 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 |
| Old Father Live Forever | Bright indirect light (just back from a sunny window) | Water when the top 3–5 cm of compost is dry, roughly every 10–14 days; reduce in winter | Toxic to pets |
| Old Gold Juniper | Direct sun (at least 4-6 hours) | Water regularly the first season; afterward only during sustained drought | Toxic to pets |
| Old 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 Sago Cycad | Direct sun (at least 4-6 hours) | When the top 5 cm of mix is dry, roughly every 12-16 days in growth | Toxic to pets |
| 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 |
| 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 |
| Olympic St. John's Wort | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Toxic to pets |
| Only the Lonely Tobacco Plant | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Opium poppy | Direct sun (at least 4-6 hours) | Weekly during establishment; every 10–14 days once growing strongly | Toxic to pets |
| Orange Lily | Direct sun (at least 4-6 hours) | When top 2–3 cm of soil is dry | Toxic to pets |
| Orange River Climbing Onion | Bright indirect light (just back from a sunny window) | Every 1–2 weeks during active vine growth; completely dry during summer dormancy | Toxic to pets |
| Orange River Lily | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days during the growing season | Toxic to pets |
| Orange Sneezeweed | 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 |
| Orange Star | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days during active growth | Toxic to pets |
| Orange-Sheathed Bucephalandra | Medium indirect light (a couple of metres from a window) | Permanently moist substrate (emersed) or fully submerged (aquatic); rhizome must never dry out | Toxic to pets |
| Oriental Bittersweet | Direct sun (at least 4-6 hours) | Extremely drought-tolerant once established; supplemental watering is rarely needed except in the first season | Toxic to pets |
| Oriental Poppy 'Beauty of Livermere' | Direct sun (at least 4-6 hours) | Once a week during active growth; reduce as plants go summer-dormant | Toxic to pets |
| Oriental Poppy 'Patty's Plum' | Direct sun (at least 4-6 hours) | Once a week during spring growth; reduce markedly as summer dormancy approaches | Toxic to pets |
| Ornamental Plum 'Nigra' | Direct sun (at least 4-6 hours) | Weekly while establishing; little once mature | Toxic to pets |
| Ornate Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of growing medium feels dry | Toxic to pets |
| Ostbo Red Mountain Laurel | Medium indirect light (a couple of metres from a window) | Regular; maintain even moisture | Toxic to pets |
| Overlooked Lagenandra | Medium indirect light (a couple of metres from a window) | Keep permanently moist to semi-submerged; does not tolerate drying out | Toxic to pets |
| Oxalis tetraphylla | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-10 days in active growth | Toxic to pets |
| Oxalis Triangularis 'Mijke' | 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 |
| Oxalis Vulcanicola 'Zinfandel' | 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 |
| Oxford and Cambridge Grape Hyacinth | Bright indirect light (just back from a sunny window) | Rainfall usually sufficient; water during prolonged dry spells in spring | 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 |
| Pacific Yew | Low light (north window or shaded room) | Weekly during establishment; every 2 weeks once established | Toxic to pets |
| Pacifica Vinca | Direct sun (at least 4-6 hours) | Every 3–5 days outdoors in summer heat; allow topsoil to partially dry between waterings | Toxic to pets |
| Paddle Plant (Flapjacks) | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Paeonia lactiflora 'Bowl of Beauty' | Direct sun (at least 4-6 hours) | Deeply about once a week through spring and early summer; taper off after dormancy | Toxic to pets |
| Paeonia lactiflora 'Festiva Maxima' | Direct sun (at least 4-6 hours) | Deeply about once a week during the growing season; less once dormant | 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 |
| Paeonia mlokosewitschii | Direct sun (at least 4-6 hours) | Deeply about once a week in the growing season; minimal once dormant | Toxic to pets |
| Painted Begonia | Medium indirect light (a couple of metres from a window) | Every 6–9 days in spring and summer; every 12–16 days in autumn and winter | Toxic to pets |
| Painted Caladium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days during active growth | Toxic to pets |
| Painted Dumbcane | Medium indirect light (a couple of metres from a window) | When the top 3–4 cm of soil is dry, roughly every 7–14 days | Toxic to pets |
| Painted Lady | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Painted Lady Gladiolus | Direct sun (at least 4-6 hours) | Moderate during autumn–spring growing season; completely dry in summer dormancy | 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 Anthurium | 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 |
| Pale Yellow Fritillary | Bright indirect light (just back from a sunny window) | Regular during active growth; reduce once foliage dies back in early summer | Toxic to pets |
| Pale-Spike Lobelia | Bright indirect light (just back from a sunny window) | Moderate; keep moist but tolerates brief dry spells | Toxic to pets |
| Palm Leaf Begonia | Bright indirect light (just back from a sunny window) | Roughly weekly in growing season; let the top 2-3 cm dry first | Toxic to pets |
| Palmate Begonia | Medium indirect light (a couple of metres from a window) | Every 6–8 days in growing season; reduce to every 10–14 days in winter | Toxic to pets |
| Panda Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Pandacaqui | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow soil to partially dry between waterings | Toxic to pets |
| Panicle Hydrangea 'Pinky Winky' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 3-5 days in summer | Toxic to pets |
| Panicle Hydrangea 'Pinky Winky' | Direct sun (at least 4-6 hours) | When the top 2-4 cm of soil is dry, regularly through summer | Toxic to pets |
| Panicle Hydrangea 'Vanilla Strawberry' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 3-5 days in summer | Toxic to pets |
| Paperwhite Narcissus | Bright indirect light (just back from a sunny window) | Keep roots consistently moist during forcing; reduce after flowering | Toxic to pets |
| Parrot Gladiolus | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce once foliage yellows; cease during summer dormancy | Toxic to pets |
| Parsons Juniper | Direct sun (at least 4-6 hours) | Water deeply during the first season; afterward only in extended drought | Toxic to pets |
| Parthenocissus henryana | Bright indirect light (just back from a sunny window) | Keep young plants moist; water established plants only in drought | Toxic to pets |
| Parthenocissus quinquefolia | Bright indirect light (just back from a sunny window) | Water through the first one to two seasons, then only in drought | Toxic to pets |
| Parthenocissus tricuspidata | Bright indirect light (just back from a sunny window) | Water young plants in dry spells until established, then rarely | Toxic to pets |
| Patini's Peace Lily | Low light (north window or shaded room) | When the top 2–3 cm of soil feels dry, roughly every 7–10 days in warm seasons | Toxic to pets |
| 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 |
| Peace lily | Medium indirect light (a couple of metres from a window) | As soon as the leaves start to droop slightly, usually every 5-7 days | Toxic to pets |
| Peacock Moraea | Direct sun (at least 4-6 hours) | Regular watering autumn to late spring; completely dry in summer | Toxic to pets |
| Pearson's Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn to early spring); once per month or less in summer | Toxic to pets |
| Pelargonium 'Ardens' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; minimal in summer rest | Toxic to pets |
| Pelargonium 'Bird Dancer' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 7-10 days in growth | Toxic to pets |
| Pelargonium 'Deacon Barbecue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 4-8 days in growth | Toxic to pets |
| Pelargonium 'Deacon Fireball' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 4-8 days in growth | Toxic to pets |
| Pelargonium 'Deacon Mandarin' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 4-8 days in growth | Toxic to pets |
| Pelargonium 'Distinction' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Dolly Varden' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-7 days in growth | Toxic to pets |
| Pelargonium 'Flower of Spring' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost dries, roughly every 5-7 days in active growth | Toxic to pets |
| Pelargonium 'Frank Headley' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Happy Thought' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Lord Bute' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of compost is dry, roughly every 5-9 days in summer | Toxic to pets |
| Pelargonium 'Madame Layal' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of compost dries, about every 5-9 days in summer | Toxic to pets |
| 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 'Occold Lagoon' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 4-7 days in summer | Toxic to pets |
| Pelargonium 'Occold Shield' | 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 '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 'Solferino' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Stellar Hannaford Star' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Tip Top Duet' | 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 'Vancouver Centennial' | 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 '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 carnosum | Direct sun (at least 4-6 hours) | When the gritty mix is fully dry, about every 10-14 days in growth; sparingly in summer dormancy | Toxic to pets |
| Pelargonium echinatum | Direct sun (at least 4-6 hours) | Sparingly in the autumn-to-spring growing season; keep nearly dry in summer dormancy | Toxic to pets |
| Pelargonium fulgidum | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Pelargonium gibbosum | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth; much less in summer dormancy | Toxic to pets |
| Pelargonium peltatum 'Amethyst' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost dries, often every 3-7 days in summer baskets | Toxic to pets |
| Pelargonium peltatum 'Barrocas' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 4-7 days in summer | Toxic to pets |
| Pelargonium 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 |
| Pelargonium triste | Direct sun (at least 4-6 hours) | Moderately in the autumn-spring growing season; keep dry during summer dormancy | Toxic to pets |
| Pelargonium x domesticum 'Burgundy' | 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 |
| Pelargonium x domesticum 'Carisbrooke' | 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 |
| Pelargonium x domesticum 'Chocolate Blotch' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 5-7 days in growth | Toxic to pets |
| Pelargonium x domesticum 'Hazel Carey' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 5-7 days in growth | Toxic to pets |
| Pelargonium x domesticum 'Lavender Grand Slam' | 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 |
| Pencil Cactus (Firestick) | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Pencil-leaf Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn–spring); once per month in summer | Toxic to pets |
| Pendulous Homalomena | Low light (north window or shaded room) | Every 7–12 days in summer; every 14–18 days in winter | Toxic to pets |
| Peony | Direct sun (at least 4-6 hours) | Deep watering once a week in dry spells | Toxic to pets |
| Peony 'Sarah Bernhardt' | Direct sun (at least 4-6 hours) | Deeply once a week during active growth and budding, more in drought; reduce after flowering and through dormancy | Toxic to pets |
| Pepino Dulce | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply every 2-4 days in summer, more in containers | Toxic to pets |
| Peregrina | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; every 2–3 weeks in winter | Toxic to pets |
| Persian Lily | Direct sun (at least 4-6 hours) | Once per week during active spring growth; completely dry in summer dormancy | 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 |
| Petra Croton | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Peyote | Direct sun (at least 4-6 hours) | Sparingly: only when soil is fully dry, roughly every 2-3 weeks in summer, none in winter | Toxic to pets |
| Philodendron | Medium indirect light (a couple of metres from a window) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Philodendron 'Burle Marx Fantasy' | Bright indirect light (just back from a sunny window) | When top 2-5 cm of soil is dry, roughly weekly in summer | Toxic to pets |
| Philodendron 'Dean McDowell' | Bright indirect light (just back from a sunny window) | Roughly weekly in the growing season; let the top 30-50% of the mix dry first | Toxic to pets |
| Philodendron 'Florida Beauty' | Bright indirect light (just back from a sunny window) | Every 5-10 days; when the top 1-2 inches of mix dries out | Toxic to pets |
| Philodendron 'Florida Ghost' | Bright indirect light (just back from a sunny window) | Roughly every 5-7 days in the growing season; less in winter | Toxic to pets |
| Philodendron 'Florida Green' | Bright indirect light (just back from a sunny window) | Roughly weekly in spring/summer, every 10-14 days in winter | Toxic to pets |
| Philodendron 'Jungle Boogie' | Bright indirect light (just back from a sunny window) | Every 1-2 weeks | 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 'Prince of Orange' | Bright indirect light (just back from a sunny window) | When the top 2.5cm (1 inch) of soil is dry | Toxic to pets |
| Philodendron 'Ring of Fire' | Bright indirect light (just back from a sunny window) | Roughly every 7-9 days in spring and summer; less in winter | Toxic to pets |
| Philodendron 'White Princess' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (top inch) of mix is dry, roughly weekly in summer | Toxic to pets |
| Philodendron Andreanum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron atabapoense | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Atom | 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 |
| Philodendron Autoclaw | 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 Billietiae | Bright indirect light (just back from a sunny window) | Every 7-14 days in the growing season; roughly every 2-3 weeks in winter | Toxic to pets |
| Philodendron Bipennifolium (Horsehead) | Bright indirect light (just back from a sunny window) | When the top 2-5 cm (1-2 in) of mix is dry, roughly weekly in growth | Toxic to pets |
| Philodendron Birkin | 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 spring and summer | Toxic to pets |
| Philodendron Black Cardinal | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Philodendron Brandtianum (Silver Leaf) | Bright indirect light (just back from a sunny window) | Roughly weekly in growing season; less in winter | Toxic to pets |
| Philodendron Brasil | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Philodendron Burle Marx | 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 Callosum | 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 |
| Philodendron Camposportoanum | Bright indirect light (just back from a sunny window) | When the top 1-2 inches (2-5 cm) of soil are dry | Toxic to pets |
| Philodendron Cobra | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Corcovadense | Bright indirect light (just back from a sunny window) | When the top half of the substrate is dry, about weekly | Toxic to pets |
| Philodendron Cream Splash | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Dark Lord | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Deja Vu | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, about weekly | Toxic to pets |
| Philodendron Domesticum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron El Choco Red | Bright indirect light (just back from a sunny window) | Roughly weekly; when the top 2-3 in (5-7 cm) of mix is dry | Toxic to pets |
| Philodendron Elegans | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Philodendron erubescens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Erubescens Green | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Fuzzy Petiole | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Philodendron Gabby | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Gigas | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of mix are dry, roughly weekly in summer and less in winter | Toxic to pets |
| Philodendron Gloriosum | Bright indirect light (just back from a sunny window) | when top 2-5 cm of soil dry | Toxic to pets |
| Philodendron gloriosum 'Zebra' | 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 Gloriosum Colombia | 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 Gloriosum Dark Form | 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 Glorious | Bright indirect light (just back from a sunny window) | When the top 3-4 cm (1-1.5 in) of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Goeldii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Golden Goddess | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Hastatum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron hederaceum 'Micans' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron hederaceum 'Rio' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron hederaceum 'Silver Stripe' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Hederaceum Heartleaf Variegata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Imperial Red | Bright indirect light (just back from a sunny window) | Every 7-10 days; when the top 2-3 cm (1 inch) of soil is dry | 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 Joepii | Bright indirect light (just back from a sunny window) | Every 1-2 weeks | Toxic to pets |
| Philodendron Jose Buono | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Lemon Lime | Bright indirect light (just back from a sunny window) | Every 7-10 days in growing season; less in winter | Toxic to pets |
| Philodendron Longilobatum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron luxurians | 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 Lynamii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Philodendron Majestic | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, about every 7-10 days | Toxic to pets |
| Philodendron Mamei | Bright indirect light (just back from a sunny window) | About once a week in spring and summer; less in winter | Toxic to pets |
| Philodendron Martianum | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, about every 7-10 days | Toxic to pets |
| Philodendron Maximum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron McColley's Finale | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Philodendron Melanochrysum | Bright indirect light (just back from a sunny window) | Roughly weekly; when the top 2-3 in (5-7 cm) of soil is nearly dry | Toxic to pets |
| Philodendron Melinonii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Mexicanum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron micans | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Philodendron Moonshine | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7 days | Toxic to pets |
| Philodendron Nangaritense | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Philodendron Painted Lady × erubescens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7 days | Toxic to pets |
| Philodendron Panduriforme | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron paraiso verde | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Pastazanum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 7-10 days | Toxic to pets |
| Philodendron Patriciae | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Pedatum (Oak Leaf) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7 days in summer | Toxic to pets |
| Philodendron Pink 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 Pink Princess | Bright indirect light (just back from a sunny window) | When the top 2.5cm of compost is dry, roughly weekly in summer | Toxic to pets |
| Philodendron Plowmanii | Bright indirect light (just back from a sunny window) | Every 1-2 weeks, when the top 1-2 inches of soil dry out | Toxic to pets |
| Philodendron Pseudoverrucosum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 6-9 days | Toxic to pets |
| Philodendron Pteromischum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 7-10 days | Toxic to pets |
| Philodendron Radiatum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Rugosum (Pigskin) | Bright indirect light (just back from a sunny window) | Roughly weekly; when the top 2-3 cm (1 inch) of soil is dry | Toxic to pets |
| Philodendron Sagittifolium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron scandens | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Selloum (Tree Philodendron) | Bright indirect light (just back from a sunny window) | When the top 2-3cm of compost feels dry, roughly weekly in summer | Toxic to pets |
| Philodendron Serpens (Fuzzy Petiole) | Bright indirect light (just back from a sunny window) | When the top 2-5 cm (1-2 in) of mix dries | Toxic to pets |
| Philodendron Sharoniae | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7 days | Toxic to pets |
| Philodendron Silver Sword | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; less in autumn and winter | Toxic to pets |
| Philodendron Sodiroi | Bright indirect light (just back from a sunny window) | Roughly once a week; allow the top 2-5 cm (1-2 in) of mix to dry between waterings | Toxic to pets |
| Philodendron Spiritus Sancti Silver | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Philodendron splendid | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Squamiferum | Bright indirect light (just back from a sunny window) | When the top 2.5-5 cm (1-2 in) of soil dries out, roughly weekly in summer and every 10-14 days in winter | Toxic to pets |
| Philodendron subhastatum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron 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 Tortum (Fernleaf) | Bright indirect light (just back from a sunny window) | When the top 3-5 cm (1-2 inches) of mix are dry, roughly every 5-7 days in summer and every 10-14 days in winter | Toxic to pets |
| Philodendron Tripartitum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7 days | Toxic to pets |
| Philodendron Verrucosum | Bright indirect light (just back from a sunny window) | Roughly weekly in the growing season; less in winter | Toxic to pets |
| Philodendron Warscewiczii | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Wendlandii | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm (1 in) of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron White Knight | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring-summer; every 14-21 days in winter | Toxic to pets |
| Philodendron White Wizard | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Philodendron Xanadu | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly weekly in summer | Toxic to pets |
| Pieris japonica Cavatine | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 3-4 cm is dry, about weekly while establishing | Toxic to pets |
| Pieris japonica Valley Rose | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 3-4 cm is dry, roughly weekly while establishing | Toxic to pets |
| Pierre's Stephania | Bright indirect light (just back from a sunny window) | Every 7–14 days in active growth; none in winter dormancy | Toxic to pets |
| Pig's Ear | Bright indirect light (just back from a sunny window) | When the soil is almost completely dry, roughly every 14 days in summer | Toxic to pets |
| Pineapple Lily | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days during the growing season | Toxic to pets |
| Pineapple Upsidedown Cake Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, about every 5-7 days during active growth | Toxic to pets |
| Pink Allusion Arrowhead Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days; allow the top 2–3 cm of soil to dry between waterings | Toxic to pets |
| Pink Anthurium | 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 |
| Pink Arisaema | Low light (north window or shaded room) | Keep moist through the growing season once growth appears, watering when the surface dries; reduce sharply as the leaf dies back to dormancy. | Toxic to pets |
| Pink Butterflies Kalanchoe | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in summer; far less in winter | Toxic to pets |
| Pink Calla Lily | Bright indirect light (just back from a sunny window) | Frequently during active growth — keep soil consistently moist; reduce sharply after flowering | Toxic to pets |
| Pink Calla Lily | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth; water when the top 2 cm is dry | Toxic to pets |
| Pink Kopsia | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil consistently moist but not waterlogged | Toxic to pets |
| Pink Princess Philodendron | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Pink Senecio | Direct sun (at least 4-6 hours) | regular during the growing season, reduced in winter | Toxic to pets |
| Pink Spot Begonia | Bright indirect light (just back from a sunny window) | Every 5–8 days, keeping soil evenly moist but not waterlogged | Toxic to pets |
| Pink Storm Lily | Direct sun (at least 4-6 hours) | Moderate in summer growth; minimal in winter | Toxic to pets |
| Pinwheel Flower | Bright indirect light (just back from a sunny window) | Once or twice per week during active growth; reduce in winter | Toxic to pets |
| 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 |
| PJM rhododendron | Bright indirect light (just back from a sunny window) | Weekly during establishment and dry spells; every 2 weeks once established | Toxic to pets |
| Plane-leaf Begonia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring and summer; every 14–18 days in winter | Toxic to pets |
| Pleated Snowdrop | Medium indirect light (a couple of metres from a window) | Weekly during active growth (late winter–spring); minimal in summer dormancy | Toxic to pets |
| Plectranthus scutellarioides 'Black Dragon' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Freckles' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Kong Rose' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Rainbow Festive Dance' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Plectranthus scutellarioides 'Wizard Scarlet' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Podocarpus 'Maki' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Poet's Narcissus | Bright indirect light (just back from a sunny window) | Moderate to regular during growth; tolerates more moisture than most narcissi; drier in summer | Toxic to pets |
| Poet's Narcissus | Direct sun (at least 4-6 hours) | Once or twice weekly during active growth; allow to dry after foliage dies back | Toxic to pets |
| Pogge's Cycad | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly in winter | Toxic to pets |
| Poinsettia | Bright indirect light (just back from a sunny window) | When the top of the soil feels dry | Toxic to pets |
| Poison Lagenandra | Medium indirect light (a couple of metres from a window) | Keep roots permanently moist or submerged; do not allow to dry out | Toxic to pets |
| Poisonous Adenia | Direct sun (at least 4-6 hours) | Every 2–4 weeks during summer growing season; completely withheld in winter | Toxic to pets |
| Poisson's Nephthytis | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Poke Milkweed | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water during dry spells, especially in sunnier sites | Toxic to pets |
| Polka dot begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in summer and every 10-14 days in winter | Toxic to pets |
| 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 |
| 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 |
| Pompon Dahlia 'Jowey Mirella' | Direct sun (at least 4-6 hours) | Deeply 2-3 times a week in summer once established; keep evenly moist while flowering | Toxic to pets |
| Poppy Anemone | Direct sun (at least 4-6 hours) | Moderate in spring, dry in summer | Toxic to pets |
| Portuguese Squill | Direct sun (at least 4-6 hours) | Water moderately in spring; keep dry in summer | Toxic to pets |
| Portulaca grandiflora 'Sundial Mango' | Direct sun (at least 4-6 hours) | When the soil is dry several centimetres down, roughly every 7-10 days; less in cool spells | Toxic to pets |
| Portulaca oleracea 'Fairytales Cinderella' | Direct sun (at least 4-6 hours) | When the soil has dried several centimetres down, about every 7-10 days; more often only in extreme heat | Toxic to pets |
| Pothos | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 7-10 days | Toxic to pets |
| Pothos 'Shangri La' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Pothos Happy Leaf | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, about every 7-14 days | Toxic to pets |
| Pothos N'Joy | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Pothos Pearls and Jade | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Prairie Milkweed | Direct sun (at least 4-6 hours) | Moderate; tolerates moist conditions better than most milkweeds | Toxic to pets |
| Prickly Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; monthly or less in winter | Toxic to pets |
| Prickly heath | Bright indirect light (just back from a sunny window) | Regular; keep evenly moist | Toxic to pets |
| Primrose | Medium indirect light (a couple of metres from a window) | Weekly watering | Toxic to pets |
| Primrose-Flower Begonia | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of compost begins to dry, roughly every 5-8 days in growth | Toxic to pets |
| Primula × polyantha | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil starts to dry, roughly every 3-5 days | Toxic to pets |
| Primula farinosa | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth; water whenever the surface dries | Toxic to pets |
| Primula japonica | Bright indirect light (just back from a sunny window) | Keep wet at all times; never let the soil dry out | Toxic to pets |
| Primula malacoides | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil starts to dry, roughly every 3-5 days | Toxic to pets |
| Prunus 'Accolade' | Direct sun (at least 4-6 hours) | Water deeply weekly for the first two seasons; established trees rely on rainfall | Toxic to pets |
| Prunus 'Kanzan' | Direct sun (at least 4-6 hours) | Water deeply weekly for the first two seasons; established trees rely on rainfall | Toxic to pets |
| Prunus 'Spire' | Direct sun (at least 4-6 hours) | Water regularly for the first 2-3 years; established trees need water only in prolonged dry spells | Toxic to pets |
| Prunus maackii | Direct sun (at least 4-6 hours) | Water young trees deeply every 7-14 days in dry weather for the first two seasons; established trees are fairly drought-tolerant | Toxic to pets |
| Prunus padus | Direct sun (at least 4-6 hours) | Water regularly while establishing; mature trees rarely need irrigation except in extended drought | Toxic to pets |
| Prunus serrula | Direct sun (at least 4-6 hours) | Keep soil evenly moist in the first 2-3 years; established trees need watering only in prolonged summer drought | Toxic to pets |
| Prunus subhirtella 'Autumnalis' | Direct sun (at least 4-6 hours) | Water regularly during establishment; mature trees need watering only in prolonged summer drought | Toxic to pets |
| Pseudodracontium lacourii | Bright indirect light (just back from a sunny window) | Keep evenly moist in active growth, watering when the top 2-3 cm dries; keep nearly dry while the tuber is dormant | Toxic to pets |
| Purging Jatropha | Direct sun (at least 4-6 hours) | Every 3–4 weeks in the growing season; none to once a month in winter dormancy | Toxic to pets |
| 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 Cyclamen | Medium indirect light (a couple of metres from a window) | Low in summer, moderate during active growth (late summer to spring) | Toxic to pets |
| Purple Heart | Bright indirect light (just back from a sunny window) | When the top inch of soil dries out, roughly weekly in summer and every 2 weeks in winter | Toxic to pets |
| Purple Heart | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Purple Milkweed | Direct sun (at least 4-6 hours) | Keep evenly moist; water during dry periods, especially while establishing | Toxic to pets |
| Purpus's Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks (growing season); monthly or less in winter | Toxic to pets |
| Pygmy Bucephalandra | Low light (north window or shaded room) | Submerged aquatic — 20-30% water changes weekly to maintain water quality. | Toxic to pets |
| Pygmy Torch Amaranth | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Pygmy Water Lily | Direct sun (at least 4-6 hours) | Aquatic — submerged in still water permanently | Toxic to pets |
| Pyrenean Lily | Bright indirect light (just back from a sunny window) | Weekly during active growth; reduce after flowering | Toxic to pets |
| Pyrenean Merendera | Direct sun (at least 4-6 hours) | Minimal; naturally dry in summer | Toxic to pets |
| Pyrenean Star of Bethlehem | Bright indirect light (just back from a sunny window) | Low to moderate during growth; dry in summer dormancy | Toxic to pets |
| Queen Anthurium | Bright indirect light (just back from a sunny window) | When the top of the medium approaches dryness (often every 5-7 days in growth; every 2-3 weeks in winter) | Toxic to pets |
| Queen of Hearts Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14 days in winter | Toxic to pets |
| Queen of Night Tulip | Direct sun (at least 4-6 hours) | Water at planting; rely on rainfall during growth; dry during dormancy | Toxic to pets |
| Queen Olga's Snowdrop | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry during active growth, roughly every 7-10 days | Toxic to pets |
| Queen Sago | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, roughly every 7-12 days in growth | Toxic to pets |
| Quercus coccinea | Direct sun (at least 4-6 hours) | Water young trees deeply every 10-14 days in dry weather through the first two seasons; established trees are drought-tolerant | Toxic to pets |
| Quercus robur 'Fastigiata' | Direct sun (at least 4-6 hours) | Water young trees deeply every 10-14 days in dry spells for the first two seasons; established oaks are very drought-tolerant | Toxic to pets |
| Rainbow Leucothoe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; do not allow to dry out | Toxic to pets |
| Raja Begonia | Medium indirect light (a couple of metres from a window) | Keep the compost consistently lightly moist; check every 3-5 days | Toxic to pets |
| Ranunculus aquatilis | Direct sun (at least 4-6 hours) | Submerged with floating leaves; grow in 0.1-1 m of clear water | Toxic to pets |
| Ranunculus asiaticus | Direct sun (at least 4-6 hours) | Keep soil evenly moist during growth and bloom; reduce sharply as foliage yellows and the plant enters dormancy | Toxic to pets |
| Ranunculus asiaticus 'Cloni Success Arancio' | Direct sun (at least 4-6 hours) | Keep soil consistently moist but never waterlogged during active growth; reduce sharply as foliage yellows after flowering | Toxic to pets |
| Ranunculus asiaticus 'Elegance Bianco' | Direct sun (at least 4-6 hours) | Keep soil evenly moist during growth and flowering; cut back watering as foliage yellows at the end of the season | Toxic to pets |
| Ranunculus asiaticus 'Mache' | Direct sun (at least 4-6 hours) | Maintain even soil moisture during growth and flowering; taper off as the foliage yellows toward dormancy | Toxic to pets |
| Rauwolff's Eminium | Direct sun (at least 4-6 hours) | Moderate during spring growing season; bone dry in summer dormancy | Toxic to pets |
| Raven ZZ Plant | Low light (north window or shaded room) | Every 2–4 weeks in growing season; every 4–6 weeks in winter | Toxic to pets |
| Rayed Broom | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Toxic to pets |
| Recurved Leucothoe | Medium indirect light (a couple of metres from a window) | Regularly; maintain consistently moist soil throughout the growing season | Toxic to pets |
| Red Aloe | Direct sun (at least 4-6 hours) | When soil is fully dry, every 1-2 weeks in warm growth | Toxic to pets |
| Red Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 3–5 days (keep evenly moist; allow top 2 cm to dry) | Toxic to pets |
| Red Arrow Arrowhead Vine | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; every 10–14 days in winter | Toxic to pets |
| Red Baneberry | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; weekly when dormant | Toxic to pets |
| Red Horned Poppy | Direct sun (at least 4-6 hours) | Rarely; only during prolonged drought | 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 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 morning glory | Direct sun (at least 4-6 hours) | Once or twice a week; drought-tolerant when established | Toxic to pets |
| Red Pagoda | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Toxic to pets |
| Red 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 Sheep Laurel | Bright indirect light (just back from a sunny window) | Moderate; keep moist | Toxic to pets |
| Red Spider Lily | Direct sun (at least 4-6 hours) | Water sparingly; let the bulb go bone-dry during summer dormancy | Toxic to pets |
| Red Ti Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Red-Silk Begonia | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil dries out, roughly every 7–10 days | Toxic to pets |
| Reed Avocado | Direct sun (at least 4-6 hours) | Deep watering when the top 5 cm of soil dries, about every 5-7 days in warm growth | Toxic to pets |
| Regal Anthurium | Bright indirect light (just back from a sunny window) | Every 5-9 days in growth; water when the top 2-3 cm has dried | Toxic to pets |
| Repandens Yew | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, roughly weekly while establishing | Toxic to pets |
| Restrepo's Chigua | Medium indirect light (a couple of metres from a window) | Every 7–10 days; ensure consistent moisture without waterlogging | Toxic to pets |
| 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 |
| Revolution Hosta | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; deep watering 1-2 times weekly | Toxic to pets |
| Rex begonia | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, every 5-7 days | Toxic to pets |
| Rex Begonia | 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 |
| Rhaphidophora Beccarii | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days in growth | Toxic to pets |
| Rhaphidophora Cryptantha | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-8 days | Toxic to pets |
| Rhaphidophora Decursiva | Bright indirect light (just back from a sunny window) | Roughly weekly to fortnightly, when top 2-3 inches of soil are dry | Toxic to pets |
| Rhaphidophora Foraminifera | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| Rhaphidophora Hongkongensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Rhaphidophora korthalsii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days in growth | Toxic to pets |
| Rhaphidophora Lobbii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Rhaphidophora Oblongata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7 days | Toxic to pets |
| Rhaphidophora Pachyphylla | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Rhaphidophora Pertusa | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Rhaphidophora Sylvicola | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Rhaphidophora Tetrasperma (Mini Monstera) | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of soil are dry, roughly weekly in summer | Toxic to pets |
| Rhaphidophora Tetrasperma Variegata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, around every 5-7 days in growth | Toxic to pets |
| 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 'Pink Pearl' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil begins to dry, roughly every 7-10 days during the growing season | Toxic to pets |
| Rhododendron 'PJM' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply 1-2 times weekly in dry spells, more in heat | Toxic to pets |
| Rhododendron 'Roseum Elegans' | Bright indirect light (just back from a sunny window) | Deeply once a week during dry spells; keep consistently moist especially in summer | Toxic to pets |
| Rhoeo Spathacea 'Tricolor' | 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 |
| Rieger begonia | Bright indirect light (just back from a sunny window) | When the top third of the mix is dry, roughly every 5-10 days | Toxic to pets |
| Ringed Begonia | Bright indirect light (just back from a sunny window) | When the top 1 inch of soil is dry | Toxic to pets |
| Ritchie's Monadenium | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Toxic to pets |
| River Nile Rex Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 5-8 days in summer | Toxic to pets |
| River Water Crowfoot | Direct sun (at least 4-6 hours) | Permanently submerged in flowing or moderately moving water 15–60 cm deep | Toxic to pets |
| Rivieri Voodoo Lily | Bright indirect light (just back from a sunny window) | Keep evenly moist during active leaf growth, watering when the top 2-3 cm of soil dries; stop almost entirely once the leaf yellows and dies back. | Toxic to pets |
| Robinia pseudoacacia 'Frisia' | Direct sun (at least 4-6 hours) | Water weekly while establishing, then rely on rainfall | Toxic to pets |
| Rock Daffodil | Direct sun (at least 4-6 hours) | Minimal; moderate during active growth, completely dry in summer | Toxic to pets |
| Rodent Tuber | Medium indirect light (a couple of metres from a window) | Consistently moist during growing season; reduce in dormancy | Toxic to pets |
| Rojo Congo | 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 |
| Rooting Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost is dry, roughly weekly in growth | Toxic to pets |
| Rose Rain Lily | Direct sun (at least 4-6 hours) | Allow partial soil drying between waterings; dry-wet trigger cycle stimulates blooming | Toxic to pets |
| Rosebay Rhododendron | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer | Toxic to pets |
| Rough Chervil | Medium indirect light (a couple of metres from a window) | Moderate — rainfall-dependent | Toxic to pets |
| Rough-Leaf Begonia | Bright indirect light (just back from a sunny window) | Every 6–9 days during growth, every 12–14 days in winter | 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 |
| Roxburgh's Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly every 7-10 days in growth | Toxic to pets |
| Roxburgh's Typhonium | Medium indirect light (a couple of metres from a window) | Moderate during growing season; withhold in dormancy | Toxic to pets |
| Roxburgh's Typhonium | Medium indirect light (a couple of metres from a window) | When the top 2–3 cm of soil is dry during active growth; dry dormancy over winter | Toxic to pets |
| Royal Azalea | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; reduce after leaf drop | Toxic to pets |
| Rubber plant | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| 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 |
| Rumph's Pothos | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| 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 |
| Rusty Foxglove | Direct sun (at least 4-6 hours) | When the top few cm of soil are dry; established plants are fairly drought-tolerant | Toxic to pets |
| Rutenberg's Pachypodium | Direct sun (at least 4-6 hours) | Every 7–14 days in summer; once monthly or less in winter | Toxic to pets |
| Rzedowski's Dioon | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer; once a month or less in winter | Toxic to pets |
| 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 |
| 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 |
| Sago palm | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| Sago Palm 'Aurea' | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days | Toxic to pets |
| 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 |
| Sand Crocus | Direct sun (at least 4-6 hours) | Water sparingly; keep dry in summer | Toxic to pets |
| Sandstone Cycad | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in active growth; monthly in winter | Toxic to pets |
| Sansevieria Ballyi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Bantel's Sensation | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Black Coral | Low light (north window or shaded room) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Canaliculata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, every 2-4 weeks (less in winter) | Toxic to pets |
| Sansevieria Concinna | Bright indirect light (just back from a sunny window) | When the soil is fully dry, every 2-3 weeks (less in winter) | Toxic to pets |
| Sansevieria Ehrenbergii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Ehrenbergii Samurai | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Eilensis | Bright indirect light (just back from a sunny window) | When the soil is bone dry, roughly every 3-4 weeks | Toxic to pets |
| Sansevieria Fischeri | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Forskaliana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, every 2-4 weeks (less in winter) | Toxic to pets |
| Sansevieria Francisii | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 12-16 days in summer | Toxic to pets |
| Sansevieria Futura Superba | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Gracilis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Hahnii | Low light (north window or shaded room) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Hargeisana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, every 2-4 weeks (less in winter) | Toxic to pets |
| Sansevieria Hyacinthoides | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Intermedia | Medium indirect light (a couple of metres from a window) | When the soil is completely dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Kirkii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Laurentii | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Sansevieria Liberica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Longiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Masoniana Variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Moonshine | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Sansevieria Nilotica | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Parva | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days in summer | Toxic to pets |
| Sansevieria Patens | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Pearsonii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Phillipsiae | Bright indirect light (just back from a sunny window) | When the soil is completely dry, about every 3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Pinguicula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Powellii | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Raffillii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Robusta | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Senegambica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Singularis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Starfish | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Stuckyi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Subspicata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Black Gold | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks (less in winter) | Toxic to pets |
| Sansevieria Trifasciata Cleopatra | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Craigii | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Futura Robusta | Low light (north window or shaded room) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Trifasciata Gold Flame | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Golden Hahnii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Trifasciata Jade Marginata | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Laurentii Superba | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Night Owl | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Robusta | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, every 2-4 weeks (less in winter) | Toxic to pets |
| Sansevieria Trifasciata Sensation | Medium indirect light (a couple of metres from a window) | When soil is fully dry, roughly every 2-3 weeks (less in winter) | Toxic to pets |
| Sansevieria Trifasciata Silver Hahnii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Trifasciata Superba | Medium indirect light (a couple of metres from a window) | When soil is fully dry, roughly every 2-3 weeks (less in winter) | Toxic to pets |
| Sansevieria Trifasciata Twist | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Trifasciata Whitney | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sardinian Glory of the Snow | Bright indirect light (just back from a sunny window) | Relies on natural rainfall during spring; water only if conditions are exceptionally dry | Toxic to pets |
| Sargent Cherry Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil starts to dry, often daily in summer | Toxic to pets |
| Sarpagandha | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; reduce in cooler months | Toxic to pets |
| Satin Pothos | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer | Toxic to pets |
| Satin Pothos | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-12 days | Toxic to pets |
| Satsuki Azalea | Bright indirect light (just back from a sunny window) | Keep evenly moist — water when the surface just begins to dry, often daily in heat | Toxic to pets |
| Savin Juniper | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; weekly during the first growing season | Toxic to pets |
| Scarlet Begonia | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil feels dry | Toxic to pets |
| Scarlet Leucothoe | Medium indirect light (a couple of metres from a window) | Regular; maintain consistent moisture | Toxic to pets |
| Scarlet Martagon Lily | Direct sun (at least 4-6 hours) | Moderate — water when top 5 cm of soil is dry | Toxic to pets |
| Scarletta Leucothoe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; do not allow soil to dry | Toxic to pets |
| Schaefer's Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in autumn–spring growing season; once per month or less in summer | Toxic to pets |
| Scharff's Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days, allowing the top 2–3 cm to dry between waterings | Toxic to pets |
| Schefflera | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, every 7-10 days | Toxic to pets |
| 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 |
| Schismatoglottis Motleyana | 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 |
| Schismatoglottis Prietoi | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil begins to dry, roughly every 5-7 days | Toxic to pets |
| Schismatoglottis Wallichii | 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 |
| Schmitz's Cycad | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in growing season; every 3–4 weeks in winter | Toxic to pets |
| 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 |
| Scindapsus aureus | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Scindapsus Exotica | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-12 days | Toxic to pets |
| Scindapsus Officinalis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Scindapsus Pictus Jade Satin | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Scindapsus Pictus Silver Hero | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-14 days | Toxic to pets |
| Scindapsus Silvery Ann | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-12 days | Toxic to pets |
| Scindapsus Treubii 'Dark Form' | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 2-3 inches of soil dry out first | Toxic to pets |
| Scindapsus Treubii Moonlight | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in growth; less in winter | Toxic to pets |
| Sea Pea | Direct sun (at least 4-6 hours) | Infrequently; allow soil to dry between waterings | Toxic to pets |
| Sea Spurge | Direct sun (at least 4-6 hours) | Sparingly — very drought-tolerant | Toxic to pets |
| Senecio macroglossus | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days; less in winter | Toxic to pets |
| Senecio macroglossus 'Variegatus' | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days; less in winter | Toxic to pets |
| Sensation Peace Lily | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring and summer; every 14 days in autumn and winter | Toxic to pets |
| Serrated Enkianthus | Bright indirect light (just back from a sunny window) | Regular — even moisture throughout growing season | Toxic to pets |
| 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 |
| Sheep Laurel | Bright indirect light (just back from a sunny window) | Regular; keep soil consistently moist | Toxic to pets |
| Shimpaku Juniper | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is just dry, often daily in summer heat | Toxic to pets |
| Shingle Monstera | Bright indirect light (just back from a sunny window) | When the top third of the mix dries | Toxic to pets |
| Shingle Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 inch) of mix dries out | Toxic to pets |
| Shining fetterbush | Bright indirect light (just back from a sunny window) | Consistently moist to wet — do not allow prolonged drought | 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 |
| Short-fronded Ceratozamia | Medium indirect light (a couple of metres from a window) | Every 2–4 weeks | Toxic to pets |
| Short-Leaved Aloe | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 1-2 weeks in summer | Toxic to pets |
| Showy Autumn Crocus | Bright indirect light (just back from a sunny window) | Relies on natural rainfall when established; no summer irrigation | 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 Japanese Lily | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil is dry | Toxic to pets |
| Showy Milkweed | Direct sun (at least 4-6 hours) | Water weekly the first season; once established water deeply only during prolonged drought | Toxic to pets |
| Shrubby Adenia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; near-zero in winter | Toxic to pets |
| Shrubby 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 |
| Siamese Sago Palm | Bright indirect light (just back from a sunny window) | Every 14–21 days in active growth; minimal in winter | Toxic to pets |
| Siberian Iris | Direct sun (at least 4-6 hours) | Regular — keep soil consistently moist | Toxic to pets |
| Siberian larkspur | Direct sun (at least 4-6 hours) | Regular — water 2–3 times per week; reduce to weekly once established in cool weather | Toxic to pets |
| Sichuan Cycad | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–4 weeks in winter | Toxic to pets |
| Sierra laurel | Medium indirect light (a couple of metres from a window) | Frequently; keep consistently moist | Toxic to pets |
| Sierra Leucothoe | Medium indirect light (a couple of metres from a window) | Regularly; do not allow to dry out between waterings | Toxic to pets |
| Silky Lupine | Direct sun (at least 4-6 hours) | Low; deeply water every 2–3 weeks during the growing season; minimal water once dormant | Toxic to pets |
| Silky wisteria | Direct sun (at least 4-6 hours) | Weekly during growing season; reduce in winter | Toxic to pets |
| Silver Crown | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer (growing season); every 3–4 weeks in autumn–winter | Toxic to pets |
| Silver Crown Cotyledon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring/summer; every 4–6 weeks in autumn/winter | Toxic to pets |
| Silver Dollar Jade | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Silver Goosefoot Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; every 10–14 days in winter | Toxic to pets |
| Silver Goosefoot Plant | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 7-10 days in summer and every 10-14 days in winter | Toxic to pets |
| Silver Jade Plant | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of soil is dry, roughly every 10-14 days in summer | Toxic to pets |
| Silver Mound Artemisia | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly every 7-10 days while establishing, then rarely | Toxic to pets |
| Silver pothos | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Silver Ragwort | Direct sun (at least 4-6 hours) | low — allow soil to dry between waterings | Toxic to pets |
| Silver Shamrock | Direct sun (at least 4-6 hours) | Water sparingly; allow to dry between waterings | Toxic to pets |
| Silver Waves Cotyledon | Bright indirect light (just back from a sunny window) | When the soil is almost dry, roughly every 10-14 days in summer | Toxic to pets |
| Silver-Veined Taro | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-8 days | Toxic to pets |
| Silvery Lupine | Direct sun (at least 4-6 hours) | Low to moderate; water deeply every 2–3 weeks during the growing season; drought-tolerant once established | Toxic to pets |
| Singapore Plumeria | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; very sparingly in winter | Toxic to pets |
| Singapore Yellow Frangipani | Direct sun (at least 4-6 hours) | Weekly to fortnightly during active growth; very sparingly in winter dormancy | Toxic to pets |
| Single-Leaf Begonia | Medium indirect light (a couple of metres from a window) | Every 7–10 days (keep compost evenly moist but never waterlogged) | Toxic to pets |
| Skinner's Zamia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14–21 days in cooler periods | Toxic to pets |
| Sky Lupine | Direct sun (at least 4-6 hours) | Low; winter rainfall sufficient in most California climates; light supplemental water in February–March extends bloom | Toxic to pets |
| Slender Anubias | Low light (north window or shaded room) | Submerged aquatic — 20-30% weekly water changes recommended. | Toxic to pets |
| Slender Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost feel dry | Toxic to pets |
| Slim-leaved Biarum | Direct sun (at least 4-6 hours) | Water sparingly in autumn and winter; keep completely dry from late spring through summer dormancy | Toxic to pets |
| Small Grape Hyacinth | Direct sun (at least 4-6 hours) | Rainfall usually sufficient; water once per week only if spring is unusually dry | Toxic to pets |
| Small Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; drought-tolerant once established | Toxic to pets |
| 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 Hydrangea 'Incrediball' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, often every 2-4 days in summer | Toxic to pets |
| Smooth-Leaf Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days; allow top 2 cm to dry between waterings | Toxic to pets |
| Snake plant | Medium indirect light (a couple of metres from a window) | When the soil is bone dry, every 2-3 weeks | Toxic to pets |
| Snake Plant | Low light (north window or shaded room) | When the soil is completely dry, roughly every 2-6 weeks depending on season and light level | Toxic to pets |
| Snake's Head Iris | Direct sun (at least 4-6 hours) | Moderate in autumn to spring; dry in summer | Toxic to pets |
| Sneezeweed | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 4-7 days, more in heat | Toxic to pets |
| Sneezeweed 'Moerheim 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 |
| 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 |
| Snowdrop Windflower | 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 |
| Soap Aloe | Direct sun (at least 4-6 hours) | When soil is fully dry, every 1-2 weeks in warm growth | Toxic to pets |
| Soconusco Zamia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in growing season; every 3–4 weeks in winter | Toxic to pets |
| Socotra Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days during the growing season (autumn–spring); completely dry during summer dormancy | Toxic to pets |
| Soft-Stemmed Begonia | Bright indirect light (just back from a sunny window) | Every 6–8 days in active growth, reduced in winter | Toxic to pets |
| Solanum crispum 'Glasnevin' | Direct sun (at least 4-6 hours) | Keep evenly moist in the first two seasons; water established plants during prolonged dry spells | Toxic to pets |
| Solanum laxum | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days in growth | Toxic to pets |
| Solanum laxum 'Album' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days in growth | Toxic to pets |
| Solitary Fishtail Palm | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Toxic to pets |
| Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; less frequent once established | Toxic to pets |
| Somali Desert Rose | Direct sun (at least 4-6 hours) | Weekly in hot active growth (above 30°C/86°F); cease or minimise in winter | Toxic to pets |
| Song of India | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Sonoran Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; every 4–6 weeks or less in winter | Toxic to pets |
| Spanish Bluebell | Medium indirect light (a couple of metres from a window) | Low to moderate; largely self-sufficient once established | Toxic to pets |
| Spanish Gorse | Direct sun (at least 4-6 hours) | Low — water only to establish; drought-tolerant thereafter | Toxic to pets |
| Spanish Iris | Direct sun (at least 4-6 hours) | Low to moderate — water during growth; keep dry in summer | Toxic to pets |
| Spathiphyllum 'Domino' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 5-9 days | 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 |
| Spathiphyllum 'Sensation' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, often every 5-9 days | Toxic to pets |
| Spear Head | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–5 weeks in autumn and winter | Toxic to pets |
| spear-leaved arrowhead vine | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 10–14 days in winter | Toxic to pets |
| Spencer Waved sweet pea | Direct sun (at least 4-6 hours) | Every 2–4 days in warm weather; every 5–7 days in cool spells | Toxic to pets |
| Spider Iris | Direct sun (at least 4-6 hours) | Moderate in winter growing season; bone dry in summer dormancy | Toxic to pets |
| Spider Milkweed | Direct sun (at least 4-6 hours) | Low; deep watering every 2–4 weeks once established | Toxic to pets |
| Spiny Adenia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; completely dry in winter | Toxic to pets |
| Spiral Aloe | Direct sun (at least 4-6 hours) | When the top few cm dry out in growth, less in dormancy | Toxic to pets |
| Spiritus Sancti | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Splendid Anthurium | Bright indirect light (just back from a sunny window) | Water when the top ~30-40% of the mix is dry, roughly every 5-10 days depending on warmth and light | Toxic to pets |
| Splendid Zamia | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; every 21 days in winter | Toxic to pets |
| 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 Nomocharis | Bright indirect light (just back from a sunny window) | Moderate to high; soil should remain consistently moist | Toxic to pets |
| Spotted Voodoo Lily | Bright indirect light (just back from a sunny window) | Dry during flowering phase; then water when the top 2-3 cm of soil is dry during active leaf growth | Toxic to pets |
| Spreading Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; reduce in winter | Toxic to pets |
| Sprenger's Tulip | Bright indirect light (just back from a sunny window) | Water during growth; dry in summer | Toxic to pets |
| Spring Cyclamen | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry during active growth (autumn through spring); withhold during summer dormancy | Toxic to pets |
| Spring Cyclamen | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 7-10 days during active growth | Toxic to pets |
| Spring Meadow Saffron | Direct sun (at least 4-6 hours) | Rainfall-dependent through winter and spring; dry summer rest | Toxic to pets |
| Spring Snowflake | Medium indirect light (a couple of metres from a window) | Regularly during growth (late winter–spring); reduced but not dry in summer | Toxic to pets |
| Spring Starflower | Bright indirect light (just back from a sunny window) | Occasional in autumn and spring; dry during summer dormancy | Toxic to pets |
| Square-stalked St John's-wort | Bright indirect light (just back from a sunny window) | High — keep consistently moist to wet | Toxic to pets |
| Square-stemmed Pelargonium | Direct sun (at least 4-6 hours) | Water very sparingly — every 14-21 days in the growing season; almost none in winter | Toxic to pets |
| Squirrel Corn | Medium indirect light (a couple of metres from a window) | Every 3-5 days in spring growing season; no irrigation once dormant | Toxic to pets |
| Staggerbush | Bright indirect light (just back from a sunny window) | Regularly — keep soil consistently moist, especially in the first 2 years | Toxic to pets |
| Stained Glass Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days; allow top 2–3 cm to dry | Toxic to pets |
| Stalked Clivia | Bright indirect light (just back from a sunny window) | Water regularly in spring and summer; reduce significantly in autumn and winter. | Toxic to pets |
| Stalked Podolasia | Medium indirect light (a couple of metres from a window) | Keep substrate permanently saturated or in shallow standing water | Toxic to pets |
| Standish's Golden Yew | Direct sun (at least 4-6 hours) | Moderate — once established, rarely needs irrigation in UK climates | Toxic to pets |
| Standishii Yew | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Standley's Zamia | Medium indirect light (a couple of metres from a window) | Every 7–14 days in growing season; every 3 weeks in winter | Toxic to pets |
| Stapelia-Like Monadenium | Bright indirect light (just back from a sunny window) | When the soil is mostly dry, roughly every 10-14 days in summer and every 4 weeks in winter | Toxic to pets |
| Star of Bethlehem | Direct sun (at least 4-6 hours) | Infrequent; relies on natural rainfall in most temperate gardens | Toxic to pets |
| Star of Bethlehem | Bright indirect light (just back from a sunny window) | Relies on natural rainfall; supplement only during extended dry spells in spring | Toxic to pets |
| Starfish Sansevieria | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks (longer in winter) | Toxic to pets |
| Starfruit | Direct sun (at least 4-6 hours) | Every 3-7 days, keeping soil consistently moist; carambola is not drought-tolerant | Toxic to pets |
| Steeds Japanese Holly | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 7-14 days during dry spells | Toxic to pets |
| Steudner-Leaved Caladium | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry during active growth, roughly every 5–7 days; withhold almost completely during dormancy | Toxic to pets |
| Steudnera colocasiifolia | 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 |
| Sticky Primrose | Bright indirect light (just back from a sunny window) | Regularly in spring and summer; minimal in winter | Toxic to pets |
| Stiff Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly weekly in growth | Toxic to pets |
| Stinking Iris | Low light (north window or shaded room) | Low to moderate — drought-tolerant once established | Toxic to pets |
| Strap-Leaf Anthurium | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm starts to dry | Toxic to pets |
| Straw Foxglove | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about weekly in dry weather | Toxic to pets |
| Strawberry Foxglove | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water weekly in dry periods | Toxic to pets |
| Strawberry Foxglove | Bright indirect light (just back from a sunny window) | Once or twice a week in dry periods; consistent moisture prolongs flowering | Toxic to pets |
| Strawberry Shake | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Streambank Lupine | Bright indirect light (just back from a sunny window) | Moderate; keep soil evenly moist; tolerates periodic wet conditions unlike most lupines | Toxic to pets |
| String of bananas | Bright indirect light (just back from a sunny window) | When soil is dry, every 14 days | Toxic to pets |
| String of dolphins | Bright indirect light (just back from a sunny window) | When soil is dry, every 10-14 days | Toxic to pets |
| String of Fishhooks | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| String of Frogs | Bright indirect light (just back from a sunny window) | When the top 1-2 cm (top inch) of soil is dry, often 1-2x per week in spring/summer | Toxic to pets |
| String of pearls | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| String of Pearls | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in autumn and winter | Toxic to pets |
| String of 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 Teardrops | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); once a month or less in summer dormancy | Toxic to pets |
| String of Tears | Bright indirect light (just back from a sunny window) | 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 |
| String of Watermelons | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; once a month or less in winter | Toxic to pets |
| Striped Amaryllis | Bright indirect light (just back from a sunny window) | Sparingly when first potted; increase as the flower stalk emerges; water every 7–10 days during active growth; withhold during dormancy | Toxic to pets |
| Striped Begonia (Listada) | Bright indirect light (just back from a sunny window) | When the top 1-2 cm (about half an inch) of mix feels dry | Toxic to pets |
| Striped Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in winter (growing season); suspend almost entirely in summer | Toxic to pets |
| 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 |
| Succulentum Pachypodium | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; withhold in winter | Toxic to pets |
| Sullivant's Milkweed | Direct sun (at least 4-6 hours) | Regular; maintain consistent moisture | Toxic to pets |
| Summer Impala Lily | Direct sun (at least 4-6 hours) | Every 7–14 days in active growth; sparingly or not at all in winter dormancy | Toxic to pets |
| Summer Skies delphinium | Direct sun (at least 4-6 hours) | Regular — deep water 2–3 times per week during growth; reduce to weekly after first bloom | Toxic to pets |
| Summer Snowflake | Bright indirect light (just back from a sunny window) | Regularly during growth (spring); tolerates seasonal dryness once dormant | Toxic to pets |
| Sun-Changing Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly weekly | Toxic to pets |
| Sungold Cypress | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply weekly in the first 2 years, then every 10-14 days in dry spells | Toxic to pets |
| Swamp Azalea | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; in garden settings water every 5-7 days during dry spells | Toxic to pets |
| Swamp doghobble | Medium indirect light (a couple of metres from a window) | Frequently; keep soil consistently moist | Toxic to pets |
| Swamp Milkweed | Direct sun (at least 4-6 hours) | Keep consistently moist; water during dry spells and never let it dry out for long | Toxic to pets |
| Sweet Autumn Clematis | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days once established | Toxic to pets |
| Sweet Autumn Clematis | Direct sun (at least 4-6 hours) | Deeply once a week during the growing season; drought-tolerant once established | Toxic to pets |
| Sweet Azalea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Sweet pea | Direct sun (at least 4-6 hours) | Weekly deep watering | Toxic to pets |
| Sweetbells Leucothoe | Medium indirect light (a couple of metres from a window) | Regularly throughout the growing season; do not allow to dry out | Toxic to pets |
| Swiss cheese vine | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 5-7 days | Toxic to pets |
| Swollen-stem Tylecodon | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); once monthly or none in summer | Toxic to pets |
| 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 |
| Syngonium 'Strawberry Ice' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Syngonium 'Three Kings' | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of soil are dry, roughly weekly in summer | Toxic to pets |
| Syngonium 'White Butterfly' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Syngonium Albo Variegatum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-8 days in growth | Toxic to pets |
| Syngonium macrophyllum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 6-9 days in growth | Toxic to pets |
| Syngonium Neon Robusta | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Syngonium Neon Robusta (Pink Arrowhead) | Bright indirect light (just back from a sunny window) | Every 7-10 days in growth; less in winter | Toxic to pets |
| Syngonium Pink Splash | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Syngonium podophyllum 'Milk Confetti' | 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 rayii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days in growth | Toxic to pets |
| Taccarum weddellianum | Bright indirect light (just back from a sunny window) | Water regularly in active growth; keep the tuber dry through dormancy | Toxic to pets |
| Taiwan Begonia | Medium indirect light (a couple of metres from a window) | When the top 2–3 cm of compost feel dry | Toxic to pets |
| Taiwan Podocarpus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| 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 |
| Tamarind | Direct sun (at least 4-6 hours) | Water moderately; let the top few cm of soil dry between waterings, roughly weekly | Toxic to pets |
| Tamarix-leaf Savin Juniper | Direct sun (at least 4-6 hours) | Low — very drought-tolerant once established | Toxic to pets |
| 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 |
| Tassel Grape Hyacinth | Direct sun (at least 4-6 hours) | Minimal; drought-tolerant once established | Toxic to pets |
| Tassel Grape Hyacinth | Direct sun (at least 4-6 hours) | Once per week during spring growth; very dry during summer dormancy | Toxic to pets |
| Tattoo Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, about every 5-7 days during active growth | Toxic to pets |
| Tayabas Begonia | Medium indirect light (a couple of metres from a window) | Every 6–9 days, allowing only the top 1–2 cm to dry between waterings | Toxic to pets |
| Tectured Schismatoglottis | Low light (north window or shaded room) | Every 7–10 days; adjust based on humidity and temperature | Toxic to pets |
| Telstar Mix China Pink | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Tenby Daffodil | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry during active growth, roughly every 7-10 days | Toxic to pets |
| Tessellated Colchicum | Direct sun (at least 4-6 hours) | Minimal; water lightly after planting, then rely on rainfall during autumn–spring growth | Toxic to pets |
| Tete Cycad | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; once a month or less in winter | Toxic to pets |
| Texas Bluebonnet | Direct sun (at least 4-6 hours) | Low; rely on rainfall; supplement only during prolonged dry spells in winter/spring | Toxic to pets |
| Texas Bluebonnet Subsp. | Direct sun (at least 4-6 hours) | Low; relies on autumn and winter rainfall; no regular supplemental watering needed once established | Toxic to pets |
| Thalictrum rochebrunianum | Bright indirect light (just back from a sunny window) | About twice a week, keeping soil evenly moist | Toxic to pets |
| The Governor lupine | Direct sun (at least 4-6 hours) | Every 7–10 days; less once established | Toxic to pets |
| 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 |
| Thieme's Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days (allow the top 2–3 cm of compost to dry between waterings) | Toxic to pets |
| Thorn Apple | Direct sun (at least 4-6 hours) | Moderate, once or twice a week in dry spells | Toxic to pets |
| Thorny Adenia | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer growing season; none in winter dormancy | Toxic to pets |
| Thorny Zamia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks | Toxic to pets |
| Thouars Cycad | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Toxic to pets |
| Threadleaf Sawara Cypress | Direct sun (at least 4-6 hours) | Once per week to every 10 days when the top 2-3 cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Three-leaved Lantana | Direct sun (at least 4-6 hours) | Every 1–2 weeks | Toxic to pets |
| Three-Part Begonia | Bright indirect light (just back from a sunny window) | Every 7–10 days (water when the top 2 cm of compost feels dry) | Toxic to pets |
| Thunberg's Cycad | Direct sun (at least 4-6 hours) | Every 14–21 days; drought-tolerant once established | Toxic to pets |
| Tiger Aloe | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in active growth, sparingly in summer dormancy and winter | Toxic to pets |
| Tiger Kitten Begonia | Medium indirect light (a couple of metres from a window) | Every 7–14 days; allow top 2 cm to dry | Toxic to pets |
| Tiger Lily | Direct sun (at least 4-6 hours) | When top 3 cm of soil is dry | Toxic to pets |
| Tiger Paws Begonia | 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 |
| Tiger Tooth Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer, monthly in winter | Toxic to pets |
| Titan Arum | Bright indirect light (just back from a sunny window) | Keep evenly moist while in leaf; reduce sharply during dormancy | Toxic to pets |
| Toad Tree | Direct sun (at least 4-6 hours) | Moderate; water regularly in summer, reduce significantly in winter dormancy | Toxic to pets |
| Tokudama Flavocircinalis Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil begins to dry, about every 5-7 days during active growth | Toxic to pets |
| Tomaselli's Dioon | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; every 5–8 weeks or less in winter | Toxic to pets |
| Tongue Water Trumpet | Medium indirect light (a couple of metres from a window) | Permanently submerged or saturated substrate; never allow to dry | Toxic to pets |
| Torch Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Totara | Direct sun (at least 4-6 hours) | When the topsoil dries, weekly while establishing then as needed | Toxic to pets |
| 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 Navicularis | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days | Toxic to pets |
| Tradescantia Sillamontana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| 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 Azalea | Direct sun (at least 4-6 hours) | Moderate; water during dry spells in the growing season but ensure rapid drainage. | Toxic to pets |
| Trailing Lantana | Direct sun (at least 4-6 hours) | Every 1–2 weeks (drought-tolerant when established) | Toxic to pets |
| Tree Kopsia | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth, every 10-14 days in winter | Toxic to pets |
| Tree Peony | Direct sun (at least 4-6 hours) | Deeply every 7-10 days in the first two years and during dry spells; established shrubs are drought-tolerant | Toxic to pets |
| Tree philodendron | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Tree rhododendron | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; monthly in winter | Toxic to pets |
| Treub's Scindapsus | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Triangle Fern | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist during the growing season; water when the top 2-3 cm begins to dry | Toxic to pets |
| Triangle Fig | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Tricolor Ti Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| 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 |
| True lily | Bright indirect light (just back from a sunny window) | Keep evenly moist while growing, every 5-7 days | Toxic to pets |
| Tuberous Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 3-5 days in summer | Toxic to pets |
| Tuberous Begonia 'Nonstop' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 4-7 days in growth | Toxic to pets |
| Tulip | Direct sun (at least 4-6 hours) | Water at planting; rely on rainfall after | Toxic to pets |
| Tulip Anthurium | 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 |
| Tulipa 'Angelique' | Direct sun (at least 4-6 hours) | Moist during autumn rooting and spring growth; dry off as foliage yellows | Toxic to pets |
| Tulipa 'Apeldoorn' | Direct sun (at least 4-6 hours) | Keep soil moist in growth; dry while dormant | Toxic to pets |
| Tulipa 'Ballerina' | Direct sun (at least 4-6 hours) | Moist through autumn rooting and spring growth; dry off as foliage yellows | Toxic to pets |
| Tulipa 'Black Parrot' | Direct sun (at least 4-6 hours) | Moist during autumn rooting and spring growth; withhold as foliage dies back | Toxic to pets |
| Tulipa 'Estella Rijnveld' | Direct sun (at least 4-6 hours) | Keep soil evenly moist during autumn rooting and spring growth; let it dry between waterings once foliage yellows | Toxic to pets |
| Tulipa 'Flaming Parrot' | Direct sun (at least 4-6 hours) | Moist during autumn rooting and spring growth; dry off as foliage yellows | Toxic to pets |
| Tulipa 'Ice Cream' | Direct sun (at least 4-6 hours) | Moist during autumn rooting and spring growth; dry off as foliage yellows | Toxic to pets |
| Tulipa 'Menton' | Direct sun (at least 4-6 hours) | Water in at planting, then only during dry spells in spring | Toxic to pets |
| Tulipa 'Monsella' | Direct sun (at least 4-6 hours) | Moist in active spring growth; dry through summer dormancy | Toxic to pets |
| Tulipa 'Prinses Irene' | Direct sun (at least 4-6 hours) | Keep soil moist while growing in spring; let bulbs stay dry in summer dormancy | Toxic to pets |
| Tulipa 'Purissima' | Direct sun (at least 4-6 hours) | Moist during autumn rooting and spring growth; dry off as foliage yellows | Toxic to pets |
| Tulipa 'Queen of Night' | Direct sun (at least 4-6 hours) | Keep soil moist in growth; dry while dormant | Toxic to pets |
| Tulipa 'Rococo' | Direct sun (at least 4-6 hours) | Moist during autumn rooting and spring growth; dry off as foliage yellows | Toxic to pets |
| Tulipa 'Tulipa clusiana' | Direct sun (at least 4-6 hours) | Rainfall in spring; keep dry during summer dormancy | Toxic to pets |
| Tulipa sylvestris | Direct sun (at least 4-6 hours) | Rainfall in most settings; tolerates moister ground than hybrids | Toxic to pets |
| Turk's Cap Lily | Bright indirect light (just back from a sunny window) | Regular during active growth in spring and summer; keep soil consistently moist but not waterlogged | Toxic to pets |
| 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 |
| 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 |
| Two-Petal Begonia | Medium indirect light (a couple of metres from a window) | Every 7–10 days; less in cooler months | Toxic to pets |
| Two-toned Pineapple Lily | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days during the growing season | Toxic to pets |
| Typhonium brownii | Medium indirect light (a couple of metres from a window) | Keep evenly moist in growth, watering when the top 2-3 cm dries; reduce sharply once foliage yellows | Toxic to pets |
| Typhonium trilobatum | Medium indirect light (a couple of metres from a window) | Keep evenly moist during active growth, about every 3-5 days; reduce in cool or dry rest periods | Toxic to pets |
| Typhonium venosum | Bright indirect light (just back from a sunny window) | Water regularly while the leaf is in growth; keep the tuber dry during dormancy | Toxic to pets |
| Typhonodorum lindleyanum | Direct sun (at least 4-6 hours) | Permanently submerged or saturated; never let it dry | 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 |
| Urmia Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| Uster's Water Trumpet | Low light (north window or shaded room) | Submerged aquatic — weekly water changes of 20-30% maintain water quality. | Toxic to pets |
| Valentine Bleeding Heart | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water every 4-6 days in spring, easing off as it goes dormant | Toxic to pets |
| Valentine's Crown Vetch | Direct sun (at least 4-6 hours) | Low to moderate — once every 2–3 weeks when established | Toxic to pets |
| Variable Zamia | Bright indirect light (just back from a sunny window) | Every 10–14 days in growing season; every 3–5 weeks in winter | Toxic to pets |
| Variegated Bear's Paw | Bright indirect light (just back from a sunny window) | Every 3–4 weeks, or when soil is completely dry | Toxic to pets |
| Variegated Dwarf Schefflera | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Variegated 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 Hiba Arborvitae | Bright indirect light (just back from a sunny window) | Once every 7-10 days, keeping soil consistently moist but not waterlogged | Toxic to pets |
| Variegated Monstera Albo | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Variegated pieris | Bright indirect light (just back from a sunny window) | Weekly; do not allow soil to dry out | Toxic to pets |
| Variegated Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; drought-tolerant once established | Toxic to pets |
| Variegated String of Pearls | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Variegated-Colour Begonia | Bright indirect light (just back from a sunny window) | Every 7–14 days (allow the top 1–2 cm of compost to dry; err on the side of slight dryness) | Toxic to pets |
| Vazquez's Zamia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer; every 14–21 days in winter | Toxic to pets |
| Vein-leaved Zamia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow top 3–5 cm to dry) | Toxic to pets |
| Veined Begonia (Venosa) | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry; sparingly in winter (roughly monthly) | Toxic to pets |
| Velvet Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season, every 3–4 weeks in winter | Toxic to pets |
| Velvet Leaf 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 |
| Villena's Velvet Anthurium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (about the top 20-30% of the pot) dries out | Toxic to pets |
| Violet Wood Sorrel | Bright indirect light (just back from a sunny window) | Moderate during active growth (spring); very little during summer dormancy | 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 |
| Vitis coignetiae | Direct sun (at least 4-6 hours) | Water young vines in dry spells; established plants are largely self-sufficient | Toxic to pets |
| Voodoo Lily | Bright indirect light (just back from a sunny window) | Water the leaf stage when the top 2-3 cm of soil is dry, roughly every 5-7 days; keep the dormant tuber dry | Toxic to pets |
| Walker's Water Trumpet | Low light (north window or shaded room) | Permanently submerged; never allow substrate to dry | Toxic to pets |
| Wallich's Begonia | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil is dry | Toxic to pets |
| 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 |
| Warneckii Dracaena | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Waterberg Cycad | Direct sun (at least 4-6 hours) | Every 3–5 weeks | Toxic to pets |
| Waterlily Taro | Bright indirect light (just back from a sunny window) | Permanently submerged roots or standing water; substrate must remain waterlogged | Toxic to pets |
| Waterlily Tulip | Direct sun (at least 4-6 hours) | Rainfall-dependent during growing season; needs dry summer dormancy | Toxic to pets |
| 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 |
| Wavy Nerine | Direct sun (at least 4-6 hours) | Very little to none in summer dormancy; regular from when flower spikes emerge in autumn through spring; stop as foliage dies back | Toxic to pets |
| Wavy-Leaf Begonia | Bright indirect light (just back from a sunny window) | When the top 1 inch of soil is dry | Toxic to pets |
| Wax Begonia | 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 |
| 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 |
| Weeping fig | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Weeping Fig Variegata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Weeping Podocarpus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days | Toxic to pets |
| Welsh Poppy | Medium indirect light (a couple of metres from a window) | Moderate; moist but not waterlogged | Toxic to pets |
| Weltoniensis Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost feels dry | Toxic to pets |
| Welwitsch's Anchomanes | Medium indirect light (a couple of metres from a window) | Every 7–10 days in active growth; cease watering during dry-season dormancy | Toxic to pets |
| Welwitsch's Anchomanes | Medium indirect light (a couple of metres from a window) | Keep evenly moist during the growing season; reduce to minimal watering during dormancy | Toxic to pets |
| Wendt's Water Trumpet | Low light (north window or shaded room) | Keep permanently submerged or in constantly saturated, waterlogged substrate | Toxic to pets |
| Western Bog Laurel | Direct sun (at least 4-6 hours) | Frequent to constant; keep wet | Toxic to pets |
| Western Columbine | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce after flowering | Toxic to pets |
| Western Skunk Cabbage | Medium indirect light (a couple of metres from a window) | Permanently moist to wet; boggy or waterlogged conditions required | Toxic to pets |
| Whale Fin Snake Plant | Bright indirect light (just back from a sunny window) | every 2-4 weeks, when soil is fully dry | Toxic to pets |
| White Anthurium | 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 |
| White Arrow Arum | Bright indirect light (just back from a sunny window) | Continuously moist to waterlogged; never allow to dry out | Toxic to pets |
| White Baneberry | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; weekly when dormant | Toxic to pets |
| White bird of paradise | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, every 7-10 days | Toxic to pets |
| White Bleeding Heart | Medium indirect light (a couple of metres from a window) | Every 3-5 days in active growth; reduce once dormant | 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 Knight Philodendron | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 7-10 days | Toxic to pets |
| White 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 Princess Philodendron | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days | Toxic to pets |
| White Rain Lily | Direct sun (at least 4-6 hours) | Moderately during growth; a dry period followed by watering triggers blooming | Toxic to pets |
| White Sails | Medium indirect light (a couple of metres from a window) | Every 7–10 days during active growth; reduce to every 14 days in winter | Toxic to pets |
| White Sapote | Direct sun (at least 4-6 hours) | Weekly for young trees; every 2–3 weeks for established trees; withhold during wet periods | Toxic to pets |
| White Skunk Cabbage | Medium indirect light (a couple of metres from a window) | Continuously moist to waterlogged; never allow to dry out | Toxic to pets |
| White Tabernaemontana | Bright indirect light (just back from a sunny window) | Twice weekly during active growth; once per week or less in winter | Toxic to pets |
| White Water Lily | Direct sun (at least 4-6 hours) | Aquatic — grows permanently submerged or in standing water | Toxic to pets |
| White Wizard Philodendron | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 7-10 days | Toxic to pets |
| Whitelock's Ceratozamia | Medium indirect light (a couple of metres from a window) | Weekly to every 10 days in growing season; reduce in winter | Toxic to pets |
| Whorled Milkweed | Direct sun (at least 4-6 hours) | Water to establish, then rarely; highly drought-tolerant once settled | Toxic to pets |
| Wide Brim Hosta | Low light (north window or shaded room) | When the top 2-3cm of soil is dry, roughly every 5-7 days during active growth | Toxic to pets |
| Wide-leaf Ceratozamia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks | Toxic to pets |
| Wild Cherry Bonsai | Direct sun (at least 4-6 hours) | When the top 2 cm of soil begins to dry, often daily in summer | Toxic to pets |
| Wild Crabapple Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, often daily in summer and much less in winter dormancy | Toxic to pets |
| Wild Lupine | Direct sun (at least 4-6 hours) | Water to establish, then rarely; it is drought-tolerant once settled | Toxic to pets |
| Williams rhododendron | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; reduce to monthly in winter | Toxic to pets |
| Willow-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 |
| Wine Palm | Direct sun (at least 4-6 hours) | Water deeply 1–2 times per week in warm weather, less frequently in cool periods | Toxic to pets |
| 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 Gem Boxwood | Medium indirect light (a couple of metres from a window) | When the top 5 cm of soil is dry, about weekly while establishing | Toxic to pets |
| Winter Iris | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water sparingly in summer | Toxic to pets |
| Winterberry Holly 'Winter Red' | Direct sun (at least 4-6 hours) | Keep consistently moist; water regularly in dry spells | Toxic to pets |
| Wintergreen Boxwood | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, about weekly in summer | Toxic to pets |
| Wintertime prickly heath | Bright indirect light (just back from a sunny window) | Regular; keep evenly moist | Toxic to pets |
| Wire-stem Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn–spring); once per month or less in summer dormancy | Toxic to pets |
| Wisley Pearl Gaultheria | Bright indirect light (just back from a sunny window) | Regularly; keep soil evenly moist | Toxic to pets |
| Wisteria 'Amethyst Falls' | Direct sun (at least 4-6 hours) | Weekly while establishing; water in summer drought | Toxic to pets |
| Wisteria floribunda | Direct sun (at least 4-6 hours) | Water deeply in dry spells, particularly through bud development; mature plants tolerate some drought | Toxic to pets |
| Wisteria floribunda 'Multijuga' | Direct sun (at least 4-6 hours) | Water deeply in dry weather, especially during flowering and bud set; established plants tolerate moderate drought | Toxic to pets |
| Wisteria sinensis | Direct sun (at least 4-6 hours) | Water deeply during dry spells, especially while flower buds form; established plants are fairly drought-tolerant | Toxic to pets |
| Wisteria sinensis 'Alba' | Direct sun (at least 4-6 hours) | Water deeply during dry spells, especially as buds form; established plants tolerate some drought | Toxic to pets |
| Wood Anemone | Medium indirect light (a couple of metres from a window) | Weekly during spring growth; none required during summer dormancy | Toxic to pets |
| Wood's Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days when actively growing, every 3–4 weeks in winter | Toxic to pets |
| Wood's Cycad | Bright indirect light (just back from a sunny window) | When the top 5 cm of mix is dry, roughly every 10-14 days in growth | Toxic to pets |
| Woolly Bear Begonia | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry | Toxic to pets |
| Wooly-leaf White Sapote | Direct sun (at least 4-6 hours) | Water frequently when young; every 1–2 weeks once established; reduce after harvest | Toxic to pets |
| Xanadu Philodendron | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Xanthosoma 'Lime Zinger' | Bright indirect light (just back from a sunny window) | Keep consistently moist; water when the top 2-3 cm is dry, often every 3-6 days in active growth | Toxic to pets |
| Xanthosoma Albomarginatum | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 2-3 cm starts to dry | Toxic to pets |
| Xanthosoma Atrovirens | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 2-3 times weekly in heat | Toxic to pets |
| Xanthosoma Lindenii | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 2-3 cm just begins to dry | Toxic to pets |
| Xanthosoma Robustum | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 2-3 times weekly | Toxic to pets |
| Yakushima Rhododendron | Bright indirect light (just back from a sunny window) | Weekly during dry weather; do not allow to dry out in summer or before frost | Toxic to pets |
| Yakushima Rhododendron 'Yaku Princess' | Bright indirect light (just back from a sunny window) | About weekly, more during heat; water when the top 2-3 cm of soil is dry | Toxic to pets |
| Yellow Azalea | Bright indirect light (just back from a sunny window) | Weekly during dry spells; established plants are reasonably drought-tolerant but flower best with consistent moisture | Toxic to pets |
| Yellow Clivia | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Yellow False Jasmine | Bright indirect light (just back from a sunny window) | Water every 7-10 days during the growing season; reduce to every 2-3 weeks once established and dormancy slows growth | Toxic to pets |
| Yellow Foxglove | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly weekly in dry spells | Toxic to pets |
| Yellow Horned Poppy | Direct sun (at least 4-6 hours) | Occasionally during dry spells only | Toxic to pets |
| Yellow Oleander | Direct sun (at least 4-6 hours) | Every 5–10 days during establishment; drought-tolerant once established | Toxic to pets |
| Yellow Prairie Wild Indigo | Direct sun (at least 4-6 hours) | Every 2 weeks in year 1–2; essentially drought independent once established | Toxic to pets |
| Yellow Rain Lily | Direct sun (at least 4-6 hours) | A dry period of 2-3 weeks followed by generous watering triggers flowers; moderate moisture otherwise | Toxic to pets |
| Yellow Water Trumpet | Medium indirect light (a couple of metres from a window) | Submerged aquatic plant — water changes of 20-30% weekly are recommended. | Toxic to pets |
| Yellow Wild Indigo | Direct sun (at least 4-6 hours) | Weekly the first season; rarely thereafter once established | Toxic to pets |
| Yellow Wood Anemone | Medium indirect light (a couple of metres from a window) | Weekly during spring growth; dormant and dry in summer | Toxic to pets |
| Yellow-scaled Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active winter growth; completely dry during summer dormancy | Toxic to pets |
| Yesterday-Today-and-Tomorrow | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top of the soil starts to dry, roughly 1-2x per week in growth. | Toxic to pets |
| Yew Bonsai | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, typically every 2-4 days in summer and less in winter | Toxic to pets |
| Yoshino Cherry | Direct sun (at least 4-6 hours) | Water young trees weekly in dry weather; established trees need little | Toxic to pets |
| Yucca | Direct sun (at least 4-6 hours) | When the soil is mostly dry, every 10-14 days | Toxic to pets |
| Zamia Fern | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks | Toxic to pets |
| Zamia loddigesii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days in growth | Toxic to pets |
| Zamia Palm | Direct sun (at least 4-6 hours) | Every 3–6 weeks | Toxic to pets |
| Zamia Pumila | Bright indirect light (just back from a sunny window) | When the top 4-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Zamia Roezlii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Zantedeschia 'Black Star' | 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 active growth | Toxic to pets |
| Zantedeschia 'Captain Safari' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist in growth and bloom; keep dry over winter dormancy | Toxic to pets |
| Zantedeschia 'Captain Tendens' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist in growth and bloom; keep dry during winter dormancy | Toxic to pets |
| Zantedeschia 'Captain Violetta' | 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 active growth | Toxic to pets |
| Zantedeschia 'Crystal Blush' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, watering when the top 2-3 cm is dry (often every 4-7 days) | Toxic to pets |
| Zantedeschia 'Edge of Night' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, watering when the top 2-3 cm of soil dries; reduce sharply as foliage fades | Toxic to pets |
| Zantedeschia 'Flame' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, watering when the top 2-3 cm of soil is dry; reduce as foliage dies back | Toxic to pets |
| Zantedeschia 'Hot Chocolate' | Bright indirect light (just back from a sunny window) | Keep evenly moist during growth, watering as the top 2-3 cm of soil dries; cut back as it goes dormant | Toxic to pets |
| Zantedeschia 'Mango' | 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 active growth | Toxic to pets |
| Zantedeschia 'Picasso' | 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 active growth | Toxic to pets |
| Zantedeschia 'Schwarzwalder' | 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 active growth | Toxic to pets |
| Zantedeschia albomaculata | 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 active growth | Toxic to pets |
| Zantedeschia elliottiana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry during active growth, roughly every 5-7 days | Toxic to pets |
| Zantedeschia jucunda | 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 active growth | Toxic to pets |
| Zantedeschia pentlandii | 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 active growth | Toxic to pets |
| Zanzibar Croton | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Zaragoza Ceratozamia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–5 weeks in winter | Toxic to pets |
| ZZ plant | Low light (north window or shaded room) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| ZZ Plant Lucky | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, roughly every 2-3 weeks | Toxic to pets |
| ZZ Plant Raven | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, roughly every 2-3 weeks | Toxic to pets |
| ZZ Plant Variegata | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 2-3 weeks | Toxic to pets |
| ZZ Plant Zenzi | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, roughly every 2-3 weeks | Toxic to pets |