| Accent Scarlet Busy Lizzie | Medium indirect light (a couple of metres from a window) | Keep the compost evenly moist; typically water every 1-3 days in warm weather as plants wilt quickly in dry conditions | Mildly toxic to pets |
| Acorus gramineus | Bright indirect light (just back from a sunny window) | Keep soil constantly moist to wet; never allow to dry out | Mildly toxic to pets |
| Acorus gramineus 'Variegatus' | Bright indirect light (just back from a sunny window) | Keep soil constantly moist to wet at all times | Mildly toxic to pets |
| Adromischus Cooperi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Cristatus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Adromischus Hemisphaericus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Adromischus Maculatus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Marianiae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Trigynus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Aechmea cylindrata | Bright indirect light (just back from a sunny window) | Keep the central cup topped up; flush and refill every 1-2 weeks | Pet-safe |
| Aechmea gamosepala | Bright indirect light (just back from a sunny window) | Keep the central cup filled; refresh weekly and water mix when top 2-3 cm dry | Pet-safe |
| Aechmea recurvata | Bright indirect light (just back from a sunny window) | Keep the small cup filled; refresh weekly and water mix when top few cm dry | Pet-safe |
| Aeonium Castello-Paivae 'Variegata' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| Aeonium Haworthii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| Aeonium Simsii | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, about every 7-12 days in active growth | Mildly toxic to pets |
| Aerangis biloba | Bright indirect light (just back from a sunny window) | Every 1-3 days when mounted; every 3-5 days in a small basket, kept lightly moist | Pet-safe |
| Aerangis fastuosa | Medium indirect light (a couple of metres from a window) | Water every 1-3 days, keeping the roots consistently moist | Pet-safe |
| Aerangis luteoalba | Bright indirect light (just back from a sunny window) | Every 1-3 days when mounted; every 3-5 days in a small basket, keeping it lightly moist | Pet-safe |
| Aerangis rhodosticta | Bright indirect light (just back from a sunny window) | Mounted plants every 1-2 days in summer, every 2-4 days in winter; potted plants when the surface bark just begins to dry | Pet-safe |
| 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 violet | Medium indirect light (a couple of metres from a window) | When the top of the soil feels just dry, every 5-7 days | Pet-safe |
| African Violet 'Blue Nile' | Bright indirect light (just back from a sunny window) | When the top of the soil feels barely dry, roughly every 5-7 days | Pet-safe |
| African Violet 'Optimara EverFloris' | Bright indirect light (just back from a sunny window) | When the top of the soil feels just dry, about every 5-7 days | Pet-safe |
| African Violet 'Optimara Little Maya' | Bright indirect light (just back from a sunny window) | When the top of the soil feels barely dry, roughly every 5-7 days | Pet-safe |
| African Violet 'Optimara' | Bright indirect light (just back from a sunny window) | When the top of the soil feels barely dry, roughly every 5-7 days | Pet-safe |
| African violet streptocarpus | Bright indirect light (just back from a sunny window) | Every 7–10 days, allowing the top inch of soil to dry between waterings | Pet-safe |
| African Wild Ginger | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry during the growing season, approximately every 7-10 days; very little during dormancy | Mildly 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 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 nizandensis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Mildly toxic to pets |
| Agave utahensis | Direct sun (at least 4-6 hours) | When fully dry, every 2-4 weeks in summer; little to none in winter | Toxic to pets |
| Agave victoriae-reginae 'Compacta' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Mildly toxic to pets |
| 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 |
| 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 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 |
| Air plant | Bright indirect light (just back from a sunny window) | Soak weekly for 20-30 minutes | Pet-safe |
| Aizoon Rosularia | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in spring and summer; rarely in winter | Pet-safe |
| Alabama Lip Fern | Medium indirect light (a couple of metres from a window) | every 2-3 weeks | Mildly toxic to pets |
| Alaska Mix Nasturtium | Direct sun (at least 4-6 hours) | When the top 3–5 cm of soil is dry, roughly every 7 days | Mildly toxic to pets |
| Albany Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep the mix consistently moist year-round; never let it dry out | Mildly toxic to pets |
| Albany Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep substrate moist but not waterlogged; water when surface begins to lighten | Mildly toxic to pets |
| Aleutian Mountain Heath | Bright indirect light (just back from a sunny window) | Keep consistently moist; water whenever the top 2–3 cm of soil begins to dry. | Mildly toxic to pets |
| Alice's Sundew | Direct sun (at least 4-6 hours) | Keep soil constantly damp; tray topped up year-round, easing off slightly in winter | Mildly 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 |
| Almost-round Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; sparingly in winter | Pet-safe |
| 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 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 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 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 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 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 |
| 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 '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 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 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 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 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 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 Minima | Direct sun (at least 4-6 hours) | When soil is dry, roughly every 2 weeks in growth | 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 Rauhii | Bright indirect light (just back from a sunny window) | When soil is dry, roughly every 2 weeks in growth | Toxic to pets |
| Aloe-like Nananthus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer; once every 4-6 weeks in winter | Mildly toxic to pets |
| Aloinopsis luckhoffii | Direct sun (at least 4-6 hours) | During cool-season growth (autumn-spring); keep nearly dry in summer | Mildly toxic to pets |
| Aloinopsis malherbei | Direct sun (at least 4-6 hours) | Mainly autumn through spring; keep nearly dry in summer dormancy | Mildly toxic to pets |
| Aloinopsis rosulata | Direct sun (at least 4-6 hours) | Autumn through spring growth; keep nearly dry in summer | Mildly toxic to pets |
| Aloinopsis schooneesii | Direct sun (at least 4-6 hours) | Autumn through spring; reduce sharply in summer and keep dry in deep winter cold | Mildly toxic to pets |
| Aloinopsis setifera | Direct sun (at least 4-6 hours) | Autumn through spring growth; keep nearly dry in summer | Mildly toxic to pets |
| Alonso's Turbinicarpus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 14-21 days in the growing season; withhold almost entirely in winter | Pet-safe |
| Alpine Aster | Direct sun (at least 4-6 hours) | Once per week in dry spells; rainfall usually sufficient when established | Mildly toxic to pets |
| Alpine Balsam | Direct sun (at least 4-6 hours) | Every 7–14 days during growth; reduce after setting seed | Mildly toxic to pets |
| Alpine Bartsia | Bright indirect light (just back from a sunny window) | Keep evenly moist; water regularly to prevent drying out | Mildly toxic to pets |
| Alpine Butterwort | Bright indirect light (just back from a sunny window) | Keep the medium constantly damp in growth via a shallow tray; reduce sharply when the winter resting bud forms | Mildly toxic to pets |
| Alpine Campion | Bright indirect light (just back from a sunny window) | Low to moderate — water during dry spells; ensure good drainage | Mildly toxic to pets |
| Alpine Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Alpine Heron's Bill | Direct sun (at least 4-6 hours) | Low to moderate — allow soil surface to dry between waterings | Mildly toxic to pets |
| Alpine Liverwort | Bright indirect light (just back from a sunny window) | Low to moderate — water when the top centimetre of soil dries | Mildly toxic to pets |
| Alpine Mouse-ear | Direct sun (at least 4-6 hours) | Sparingly — allow soil to dry between waterings; minimal winter moisture | Pet-safe |
| Alpine Pink | Direct sun (at least 4-6 hours) | Low to moderate; water when the top 2 cm of soil are dry | Mildly toxic to pets |
| Alpine Rock Jasmine | Direct sun (at least 4-6 hours) | Low — allow the top inch of soil to dry between waterings | Mildly toxic to pets |
| Alpine Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks when in growth (spring–summer); very sparingly in winter | Pet-safe |
| Alpine Squill | Medium indirect light (a couple of metres from a window) | Water during growth; dry during summer dormancy | Toxic to pets |
| Alpine Water Fern | Medium indirect light (a couple of metres from a window) | When the top 1 cm of soil feels dry, roughly every 4-6 days in summer | Pet-safe |
| Alpine Woodsia | Medium indirect light (a couple of metres from a window) | every 1-2 weeks during the growing season | Mildly toxic to pets |
| Alternanthera reineckii 'Mini' | Bright indirect light (just back from a sunny window) | Fully submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Amalia's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Daily to every other day; medium must stay damp but not sodden | Pet-safe |
| American Parsley Fern | Bright indirect light (just back from a sunny window) | Keep consistently moist; never allow to fully dry out | Mildly toxic to pets |
| American Wall Fern | Medium indirect light (a couple of metres from a window) | Every 7–10 days when in growth; every 2–3 weeks in winter | Pet-safe |
| American Wood Anemone | Medium indirect light (a couple of metres from a window) | Weekly during active spring growth; none during summer dormancy | Toxic to pets |
| Amethyst Porroglossum | Medium indirect light (a couple of metres from a window) | Daily if mounted; every 1–2 days if potted; do not dry out | Pet-safe |
| Anaga Monanthes | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in winter | Mildly toxic to pets |
| 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 |
| Angel Frost Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in spring and autumn | Pet-safe |
| Angel's Tears Daffodil | Direct sun (at least 4-6 hours) | Low; water during active growth, dry summer dormancy | Toxic to pets |
| Angel's 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 |
| Angelonia angustifolia 'Serenita Raspberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Angraecum distichum | Bright indirect light (just back from a sunny window) | Keep evenly moist; water roughly every 2-4 days when mounted, or when the bark surface just begins to dry | Pet-safe |
| Annual Phlox | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil evenly moist but not saturated | Pet-safe |
| Annual Phlox 'Sugar Stars' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 4-7 days | Pet-safe |
| Annual Rainbow Plant | Direct sun (at least 4-6 hours) | Keep medium wet at all times; tray method, water never allowed to dry out | Pet-safe |
| Anoectochilus roxburghii | Low light (north window or shaded room) | Keep evenly moist, watering roughly every 3-5 days as the surface begins to dry | Pet-safe |
| Anthurium arisaemoides | Bright indirect light (just back from a sunny window) | When the top 2 cm of mix begins to dry, about every 4-7 days | Toxic to pets |
| Anthurium 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 |
| Antimima dualis | Direct sun (at least 4-6 hours) | Thorough but infrequent autumn-spring; little or none in summer | Mildly toxic to pets |
| Antirrhinum majus 'Twinny Peach' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Anubias barteri var. barteri | Low light (north window or shaded room) | Submerged full-time; change 20-30% of tank water weekly | Mildly toxic to pets |
| Anubias barteri var. nana | Low light (north window or shaded room) | Submerged full-time; change 20-30% of tank water weekly | Mildly toxic to pets |
| Anubias barteri var. nana 'Petite' | Low light (north window or shaded room) | Submerged full-time; change 20-30% of tank water weekly | Mildly toxic to pets |
| Anubias congensis | Low light (north window or shaded room) | Submerged full-time; change 20-30% of tank water weekly | Mildly toxic to pets |
| 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 |
| Apricot Bouquet gloxinia | Bright indirect light (just back from a sunny window) | Every 5–10 days; keep evenly moist during active growth | Pet-safe |
| Apricot Gongora | Bright indirect light (just back from a sunny window) | Consistently moist year-round; slight reduction in winter | Pet-safe |
| Argyroderma delaetii | Direct sun (at least 4-6 hours) | During autumn-to-spring growth let the gritty mix dry fully between soaks; keep dry in summer dormancy | Mildly toxic to pets |
| Argyroderma fissum | Direct sun (at least 4-6 hours) | Let the gritty mix dry fully between soaks in autumn-to-spring growth; keep dry in summer | Mildly toxic to pets |
| Argyroderma pearsonii | Direct sun (at least 4-6 hours) | Let the gritty mix dry fully between soaks in autumn-to-spring growth; keep dry in summer | Mildly toxic to pets |
| Argyroderma testiculare | Direct sun (at least 4-6 hours) | Only during active growth (autumn through spring); keep bone-dry in summer dormancy | Mildly 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 |
| Ariocarpus Fissuratus | Bright indirect light (just back from a sunny window) | Very sparingly — when fully dry, roughly every 3-4 weeks in summer; almost none otherwise | Mildly toxic to pets |
| Arizona Chalk Dudleya | Direct sun (at least 4-6 hours) | Every 3–4 weeks in winter and early spring; completely dry in summer dormancy | Mildly toxic to pets |
| Armenian Speedwell | Direct sun (at least 4-6 hours) | Every 10–14 days during the growing season; little to none in winter. | Pet-safe |
| Armored Frailea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Aroanian Germander | Direct sun (at least 4-6 hours) | Minimal — once every 3 weeks in summer; dry in winter | Mildly toxic to pets |
| Aromatic Didymocarpus | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season; reduce in winter | Pet-safe |
| Asplenium platyneuron | Low light (north window or shaded room) | Water when the top 2-3 cm is dry; tolerates short dry spells better than most ferns | Pet-safe |
| Aster 'Professor Kippenburg' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days in summer | Mildly toxic to pets |
| Astroloba Bullulata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth; monthly or less in winter | Mildly toxic to pets |
| Astroloba Congesta | Bright indirect light (just back from a sunny window) | When soil is completely dry, about every 2-3 weeks in growth and monthly or less in winter | Mildly toxic to pets |
| Astroloba Corrugata | Bright indirect light (just back from a sunny window) | When the soil has dried out completely — roughly every 2-3 weeks in growth, monthly or less in winter | Mildly toxic to pets |
| Astroloba Foliolosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry — roughly every 2-3 weeks in growth, monthly or less in winter | Mildly toxic to pets |
| Astroloba Spiralis | Bright indirect light (just back from a sunny window) | When the soil is completely dry — roughly every 2-3 weeks in growth, monthly or less in winter | Mildly toxic to pets |
| Astrophytum coahuilense | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 14 days in summer; keep dry in winter | Pet-safe |
| Athyrium filix-femina 'Minutissimum' | Low light (north window or shaded room) | Keep consistently moist; water every 4-6 days, more in heat | Mildly toxic to pets |
| Atlantic Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; once monthly in winter | Mildly toxic to pets |
| Auricula | Bright indirect light (just back from a sunny window) | Moderately in spring and summer; reduce significantly in autumn and winter | Toxic to pets |
| Auricula Primrose | Bright indirect light (just back from a sunny window) | Water when top 2 cm of soil is dry; more frequent in active growth, sparingly in summer | Mildly 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 Catchfly | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; reduce in winter | Pet-safe |
| Autumn Crocus | Direct sun (at least 4-6 hours) | Low — naturally rainfall-dependent; needs dry summer dormancy | Mildly 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 Crocus Speciosus | Direct sun (at least 4-6 hours) | Rainfall usually sufficient outdoors; water sparingly once per week only if autumn is exceptionally dry | Mildly 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 Gentian | Direct sun (at least 4-6 hours) | Very low — rain-fed only | Mildly 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 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 |
| Awl-Leaved Air Plant | Bright indirect light (just back from a sunny window) | Soak weekly; mist 2–3 times per week | Pet-safe |
| Ayabaca Masdevallia | Medium indirect light (a couple of metres from a window) | Every 2–3 days; keep medium consistently moist | Pet-safe |
| Azolla filiculoides | Direct sun (at least 4-6 hours) | Floats permanently on still water; no separate watering | Mildly toxic to pets |
| Azolla pinnata | Bright indirect light (just back from a sunny window) | Keep floating on still or barely-moving water at all times; top up evaporation weekly | Mildly toxic to pets |
| Aztec Cactus | Bright indirect light (just back from a sunny window) | When the potting mix is almost completely dry, roughly every 14-28 days in the growing season; very sparingly in winter | Pet-safe |
| Azure Grape Hyacinth | Direct sun (at least 4-6 hours) | Water during active growth; allow to dry out completely in summer | Mildly toxic to pets |
| Baboon Flower | Direct sun (at least 4-6 hours) | Regular during growth and flowering, dry during summer dormancy | Mildly toxic to pets |
| Baby Tears Plant | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist, watering every 3-5 days | Pet-safe |
| Baby Toes | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer active season; very rarely in winter | Pet-safe |
| Bacopa australis | Bright indirect light (just back from a sunny window) | Grown submersed; do a 30-50% aquarium water change weekly | Mildly toxic to pets |
| Bahian Earth Star | Medium indirect light (a couple of metres from a window) | Every 7–10 days | Pet-safe |
| Bahian Neoregelia | Direct sun (at least 4-6 hours) | Water sparingly; allow potting medium to dry between waterings and keep a small amount of water in the central cup | Pet-safe |
| Baker's Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| Balkan Pink | Direct sun (at least 4-6 hours) | Low; water sparingly, allowing soil to dry fully between waterings | Mildly toxic to pets |
| Balkan Rock Pink | Direct sun (at least 4-6 hours) | Very infrequent; drought-tolerant | Mildly toxic to pets |
| Balkan Saxifrage | Direct sun (at least 4-6 hours) | Low — water at the base only; allow near-drying between waterings | Pet-safe |
| Ball Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, about every 7-10 days in summer; sparingly to none in winter | Pet-safe |
| Banded Cape Primrose | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; reduce to every 10-14 days in winter | Pet-safe |
| Banded Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in summer, sparse in winter | Pet-safe |
| Bare-stemmed Sinningia | Bright indirect light (just back from a sunny window) | Moderate in growing season; withhold in dry rest period | Pet-safe |
| Barla's Masdevallia | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; roots should never dry out completely | Pet-safe |
| Barnim's Dorstenia | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 3–4 weeks in winter | Mildly toxic to pets |
| Bartram's Air Plant | Bright indirect light (just back from a sunny window) | Mist lightly 3–4 times a week or soak briefly once a week | Pet-safe |
| 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 |
| Batalin's Tulip | Direct sun (at least 4-6 hours) | Light to moderate in spring; completely dry in summer | Toxic to pets |
| Bearded Huernia | Bright indirect light (just back from a sunny window) | Every 14–21 days when actively growing (spring–autumn); minimal in winter (once a month or less) | Pet-safe |
| Bearded Trichodiadema | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in the growing season (winter-spring); reduce in summer when the plant is semi-dormant | Pet-safe |
| Beaugleholes Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate constantly moist year-round | Mildly toxic to pets |
| Beautiful Gastrochilus | Bright indirect light (just back from a sunny window) | Daily misting of roots; soak mounted plants every 2-3 days during active growth; reduce to every 5-7 days in cooler months | Pet-safe |
| Beautiful Graptopetalum | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; monthly or less in winter | Pet-safe |
| Beautiful Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water only during active growth (late summer through autumn and again briefly in spring); keep dry the rest of the year | Pet-safe |
| Beautiful Sundew | Bright indirect light (just back from a sunny window) | Tray method, keep medium consistently moist | Pet-safe |
| Beautiful-net Lepanthes | Medium indirect light (a couple of metres from a window) | Daily to every 2 days; never allow roots to dry out completely | Pet-safe |
| 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 |
| 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 '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 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 '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 '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 '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 '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 '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 '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 '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 '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 '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 '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 '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 '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 '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 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 '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 '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 '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 '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 '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 × 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 × 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 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 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 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 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 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 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 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 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 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 |
| Benedict's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Every 1–2 days during growth; morning fogging in winter rest | Pet-safe |
| Bent Masdevallia | Bright indirect light (just back from a sunny window) | Every 2-3 days in warm weather, every 3-4 days in winter | Pet-safe |
| Bergeranthus multiceps | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly every 7-10 days in active growth; reduce in peak summer and winter | Mildly toxic to pets |
| Berlandier's Jatropha | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Toxic to pets |
| Bertolonia maculata | Bright indirect light (just back from a sunny window) | Keep the mix evenly moist, watering when the top layer just starts to dry, roughly every 4-6 days | Pet-safe |
| Bertolonia Marmorata | Medium indirect light (a couple of metres from a window) | Keep evenly moist at all times; water as the surface starts to dry, often every 3-5 days | Pet-safe |
| Bethencourt's Aichryson | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season (spring and autumn); sparingly in summer heat and winter rest | Mildly toxic to pets |
| Beucker's Earth Star | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of potting mix is dry, roughly every 7-10 days | Pet-safe |
| Big Kiss Yellow Flame Gazania | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| 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 Foot Fern | Bright indirect light (just back from a sunny window) | every 2-4 weeks (very drought-tolerant once established) | Mildly toxic to pets |
| Bird's Foot Fern | Bright indirect light (just back from a sunny window) | Allow the top half of soil to dry out between waterings, roughly every 10-14 days | Mildly toxic to pets |
| Bird's Nest Cactus | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 7-14 days in summer | Pet-safe |
| Biting Porroglossum | Medium indirect light (a couple of metres from a window) | Daily or every other day; medium must not dry out | Pet-safe |
| Bitterroot | Direct sun (at least 4-6 hours) | Winter rains / early spring only; bone dry from June to October | Pet-safe |
| Bitterroot Lewisia | Bright indirect light (just back from a sunny window) | Weekly in spring; monthly or less in summer dormancy | Pet-safe |
| 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 Flowering Sedge | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist to wet; water whenever the surface begins to dry | Pet-safe |
| Black Mondo Grass | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Black Mondo Grass | Medium indirect light (a couple of metres from a window) | Once a week during the growing season; reduce in winter | Mildly toxic to pets |
| Black Prince Echeveria | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Black-stemmed Spleenwort | Medium indirect light (a couple of metres from a window) | When the top centimetre of substrate feels dry | Pet-safe |
| Bladderwort | Bright indirect light (just back from a sunny window) | Keep constantly wet — never let it dry out | Mildly toxic to pets |
| Blanket Flower 'Goblin' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days; minimal once established | Mildly toxic to pets |
| Blister plant | Low light (north window or shaded room) | Every 3–5 days; never allow to dry out | Pet-safe |
| Blochman's Liveforever | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (October–April); virtually none in summer | Pet-safe |
| Blood Bromeliad | Bright indirect light (just back from a sunny window) | Keep cup filled; refresh every 1-2 weeks | Pet-safe |
| Blood-Cupped Pink | Direct sun (at least 4-6 hours) | Infrequent; highly drought-tolerant once established | Mildly toxic to pets |
| Blood-red Bertolonia | Medium indirect light (a couple of metres from a window) | Every 4–6 days; keep medium consistently moist | Pet-safe |
| Blood-red Guzmania | Medium indirect light (a couple of metres from a window) | Refill tank every 5–7 days; flush monthly | Pet-safe |
| Blood-red Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; keep medium consistently lightly moist | Pet-safe |
| Blue Echeveria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Blue Fescue | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; sparingly once established | Mildly toxic to pets |
| Blue Frills cape primrose | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; every 14–21 days in winter | Pet-safe |
| Blue Melon Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 3-4 weeks in winter | Pet-safe |
| Blue Moor Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; rarely thereafter except in extended drought | Mildly 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-Flowered Air Plant | Bright indirect light (just back from a sunny window) | Once or twice weekly | Pet-safe |
| Bluff Lettuce | Direct sun (at least 4-6 hours) | Every 3–4 weeks in winter/spring; very little to none in summer | Pet-safe |
| Blume's Typhonium | Bright indirect light (just back from a sunny window) | Moderate when in growth; withhold completely in dormancy | Toxic to pets |
| Blunt Greenhood | Medium indirect light (a couple of metres from a window) | Keep lightly moist during active growth (autumn–spring), roughly every 5-7 days | Pet-safe |
| Blushing Dunce Cap | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; very sparingly in autumn; almost none in winter | Pet-safe |
| Boat-Leaf Orthophytum | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; every 14–21 days in winter | Pet-safe |
| Boat-Shaped Orthophytum | Direct sun (at least 4-6 hours) | Moderate; water every 7–10 days, allowing the medium to dry between waterings | Pet-safe |
| Boea Hygroscopica | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Mildly toxic to pets |
| Boehmer's Dunce Cap | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer (active growing season); once monthly or less in winter | Mildly toxic to pets |
| 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 |
| Boissier's Silverbush | Direct sun (at least 4-6 hours) | Very infrequent once established | Mildly toxic to pets |
| Boivin's Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in the growing season; every 4–6 weeks in winter | Pet-safe |
| Boke's Button Cactus | Direct sun (at least 4-6 hours) | When the mix has been dry for several days; roughly every 14-28 days in the growing season and once every 6-8 weeks in winter | Pet-safe |
| Bolbitis heudelotii | Medium indirect light (a couple of metres from a window) | Permanently submerged; 30-50% water change weekly | Mildly toxic to pets |
| Bolivian Sunset | Medium indirect light (a couple of metres from a window) | Every 4–5 days in growth; reduce in dormancy | Mildly toxic to pets |
| Bolus' Stomatium | Bright indirect light (just back from a sunny window) | Very sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Bon Bon Mix Pot Marigold | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Mildly toxic to pets |
| Borchers' Oroya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, every 10-14 days in summer | Pet-safe |
| Borchers' Schwantesia | Direct sun (at least 4-6 hours) | Every 10-14 days in the autumn-winter growing season; taper to monthly in spring; almost none in summer | Mildly toxic to pets |
| Boulder Blue Fescue | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; sparingly once established | Mildly toxic to pets |
| Bracteate Rhinephyllum | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring–summer; minimal in winter | Pet-safe |
| Bracted Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in winter | Pet-safe |
| Bradley's Spleenwort | Medium indirect light (a couple of metres from a window) | When the top 1–2 cm of substrate dries out | Pet-safe |
| Brain Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in spring and summer; nearly dry through winter | Pet-safe |
| Brassavola digbyana | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; far less in winter rest, every 2-3 weeks | Pet-safe |
| Brazilian Edelweiss | Bright indirect light (just back from a sunny window) | When the top few cm of soil are dry during active growth; withhold during dormancy | Pet-safe |
| Brazilian Micro Sword | Bright indirect light (just back from a sunny window) | Permanently submerged aquatic plant | Pet-safe |
| Brazilian Sinningia | Bright indirect light (just back from a sunny window) | When top 2–3 cm of compost feel dry | Pet-safe |
| Brigham's Specklinia | Medium indirect light (a couple of metres from a window) | Every 1–2 days; allow medium to barely dry between waterings | Pet-safe |
| Bright Bikinis strawflower | Direct sun (at least 4-6 hours) | Every 5–7 days; allow soil to dry slightly between waterings | Mildly toxic to pets |
| Bright Bikinis Strawflower | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Bristle-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow top half of soil to dry) | Pet-safe |
| Bristle-Leaved Air Plant | Bright indirect light (just back from a sunny window) | Soak weekly; mist 2–3 times per week in dry conditions | Pet-safe |
| Bristly Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; medium kept consistently moist | Pet-safe |
| Britten's Tiger Jaws | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season (late summer–autumn); minimal in winter and spring | Pet-safe |
| Britten's Tiger Jaws | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn to spring); once a month or less in summer | Pet-safe |
| Broad-leaved Anubias | Low light (north window or shaded room) | Aquatic or emersed; submersed specimens require stable aquarium water; emersed plants need consistently moist conditions | Mildly 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 |
| Broadway's Melon Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 4 weeks in winter | Pet-safe |
| Brown Spiderwort | 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 | Mildly toxic to pets |
| Browning Coelogyne | Medium indirect light (a couple of metres from a window) | Evenly moist in the growing season (mid-spring to early autumn); water every 3–4 weeks in winter rest | Pet-safe |
| Bruch's Chin Cactus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in summer; very sparingly in winter | Pet-safe |
| Bucephalandra 'Brownie Ghost' | Low light (north window or shaded room) | Continuously submerged; 20-30% aquarium water change weekly | Toxic to pets |
| Bucephalandra Catherineae | Low light (north window or shaded room) | Keep the rhizome and roots constantly moist; mist emersed plants daily or run a sealed terrarium | Mildly toxic to pets |
| Bucephalandra Motleyana | Low light (north window or shaded room) | Keep roots and rhizome continuously moist; mist daily when emersed or grow submerged | Mildly toxic to pets |
| Buchholtz's Billbergia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks (soil); cup refreshed every 3–4 weeks | Pet-safe |
| Buchholz's Tylecodon | Bright indirect light (just back from a sunny window) | Every 10–14 days when actively growing (autumn–spring); once per month or less in summer | Toxic to pets |
| Bud-bearing Trisetella | Medium indirect light (a couple of metres from a window) | When the medium surface is just barely drying, roughly every 3-5 days | Pet-safe |
| 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 |
| Bueck's Thelocactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer; once a month or less in winter | Pet-safe |
| Buffalo Cow Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, approximately every 14-21 days in summer | Pet-safe |
| Buining's Uebelmannia | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; once every 4-6 weeks or less in winter | Pet-safe |
| Bulbophyllum barbigerum | Medium indirect light (a couple of metres from a window) | Every 2-4 days; keep evenly moist | Pet-safe |
| Bulbophyllum Elizabeth Ann | Medium indirect light (a couple of metres from a window) | Every 2-4 days; keep consistently moist | Pet-safe |
| Bulbophyllum falcatum | Bright indirect light (just back from a sunny window) | Water when the roots and medium approach dryness, roughly every 2-4 days when mounted, less in pots | Pet-safe |
| Bulbophyllum vaginatum | Bright indirect light (just back from a sunny window) | Water as the medium approaches dryness, around every 2-4 days; daily when mounted in heat | Pet-safe |
| Bulbous Buttercup | Direct sun (at least 4-6 hours) | Once weekly or less; drought-tolerant once established | Toxic to pets |
| Bulbous Corydalis | Medium indirect light (a couple of metres from a window) | Rely on natural rainfall during spring growth; no irrigation needed once dormant in summer | Toxic to pets |
| Bulbous Trichodiadema | Direct sun (at least 4-6 hours) | Every 2–3 weeks during spring and summer; once a month or less in winter | Pet-safe |
| Bullate Nautilocalyx | Medium indirect light (a couple of metres from a window) | Every 2–4 days in the growing season; reduce to once weekly in autumn–winter | Pet-safe |
| Burchard's Caralluma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and autumn; very sparingly in summer and winter | Mildly toxic to pets |
| Burser's Saxifrage | Bright indirect light (just back from a sunny window) | Every 7–10 days during growth; minimal in winter | Pet-safe |
| Bushy Aichryson | Bright indirect light (just back from a sunny window) | Every 10–15 days in summer (growing season); once monthly in winter | Mildly toxic to pets |
| Button Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep nearly dry in winter | Pet-safe |
| Button Cactus | Direct sun (at least 4-6 hours) | When the mix is completely dry, roughly every 14-21 days in summer; once a month or less in winter | Pet-safe |
| Button fern | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, every 7-10 days | Pet-safe |
| Button Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| 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 Meadow Saffron | Bright indirect light (just back from a sunny window) | Relies on natural rainfall; needs no supplementary watering once established | Toxic to pets |
| Cadiz Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; very rarely in winter | Mildly toxic to pets |
| Caladium '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 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 |
| Calathea Micans | 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 | Pet-safe |
| Calathea Undulata | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil starts to dry, roughly every 5-7 days in growth | Pet-safe |
| Calathea Undulata 'Wavestar' | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil dries, roughly every 5-7 days in growth | Pet-safe |
| Calathea Wiotii | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil dries, about every 5-7 days while actively growing | Pet-safe |
| Calceolaria Herbeohybrida | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost feels dry, roughly every 2-4 days while in flower | Mildly toxic to pets |
| California Fawn Lily | Medium indirect light (a couple of metres from a window) | Regular in spring growing season; minimal during summer dormancy | Mildly toxic to pets |
| California Sunset | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn/winter | Pet-safe |
| Callisia Repens 'Pink Lady' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 6-10 days | Mildly toxic to pets |
| Callous-lipped Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of mix becomes dry, roughly every 5-7 days year-round | Mildly toxic to pets |
| Callus Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the top of the mix begins to dry, roughly every 5-7 days | Pet-safe |
| Caltha palustris 'Flore Pleno' | Direct sun (at least 4-6 hours) | Keep wet at all times; saturated soil or shallow water | Toxic to pets |
| Cambodian Sonerila | Medium indirect light (a couple of metres from a window) | Every 4–7 days; keep medium consistently moist | Pet-safe |
| Canada Mayflower | Low light (north window or shaded room) | 2–3 times per week during the growing season; minimal in dormancy | Mildly toxic to pets |
| Canada Violet | Medium indirect light (a couple of metres from a window) | Weekly; more frequently in warm or dry periods | Mildly toxic to pets |
| Canary Island Monanthes | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in spring and summer; once monthly or less in autumn and winter | Mildly toxic to pets |
| Candia Sulcorebutia | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; virtually none from October to March | Pet-safe |
| Candy Cane Sorrel | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during active growth | Mildly toxic to pets |
| Canigueral's Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once a month during winter dormancy | Pet-safe |
| Cantabrian Draba | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Canyon Liveforever | Direct sun (at least 4-6 hours) | Every 2–3 weeks in winter/spring; minimal to none in summer | Pet-safe |
| Cape jewels | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 5–7 days in borders | Pet-safe |
| Cape Primrose | Bright indirect light (just back from a sunny window) | every 7–10 days in the growing season, every 14–21 days in winter | Pet-safe |
| Cape Primrose | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cape Primrose 'Bristol's Party Girl' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Cape Sundew | Bright indirect light (just back from a sunny window) | Keep constantly moist; never let it dry out | Mildly toxic to pets |
| Cape Sundew | Bright indirect light (just back from a sunny window) | Keep substrate continuously moist via the tray method — sit pot in 1–2 cm of water at all times | Mildly toxic to pets |
| Caralluma acutangula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Caralluma europaea | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; keep nearly dry October-March | Mildly toxic to pets |
| Caralluma hesperidum | Direct sun (at least 4-6 hours) | When soil is bone-dry, about every 10-14 days in active growth; keep nearly dry in winter | Mildly toxic to pets |
| Caralluma speciosa | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 7-12 days in summer heat; minimal water in winter | Mildly toxic to pets |
| Cardinal Flower Sinningia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| 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 |
| Carmen's Pincushion | Direct sun (at least 4-6 hours) | Every 10-14 days in the spring-summer growing season when the top 2-3 cm of soil is dry; every 4-6 weeks or less in winter | Pet-safe |
| Carol's Ruschia | Direct sun (at least 4-6 hours) | When soil is completely dry, approximately every 10-14 days in spring-summer; once monthly or less in winter | Pet-safe |
| Carolina Mosquito Fern | Medium indirect light (a couple of metres from a window) | Aquatic — free-floating on still or slow-moving water permanently | Pet-safe |
| Carolina Spring Beauty | Medium indirect light (a couple of metres from a window) | Moderate during active spring growth; essentially none during summer–winter dormancy. | Pet-safe |
| Carrot-leaved Pelargonium | Direct sun (at least 4-6 hours) | Water when the top 2–3 cm of compost is dry during growth (autumn–spring); completely dry in summer dormancy | Toxic to pets |
| Castilian Heron's Bill | Direct sun (at least 4-6 hours) | Water sparingly every 10-14 days in the growing season; almost none from late autumn to spring | Mildly toxic to pets |
| Cat's Jaws | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth and much less in summer rest | Mildly toxic to pets |
| Cat's Jaws | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10–14 days in spring and summer; reduce to once a month or less in winter | Mildly toxic to pets |
| Cat's-ear | Direct sun (at least 4-6 hours) | Low — very drought-tolerant once established | Mildly toxic to pets |
| Catesby's Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist in spring; reduce after summer dormancy | Mildly 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 |
| Cattleya 'Why Not' | Bright indirect light (just back from a sunny window) | When the bark dries, roughly every 5-7 days in growth | Pet-safe |
| Cattleya luteola | Bright indirect light (just back from a sunny window) | When the mix approaches dry, roughly every 5-7 days in growth | Pet-safe |
| Cattleya walkeriana | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 5-7 days in growth; reduced after flowering | Pet-safe |
| Caucasian Draba | Direct sun (at least 4-6 hours) | Low — water only when soil is dry | Mildly toxic to pets |
| Cautley Roscoea | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry during the growing season, approximately every 7-14 days; reduce to very low or none in winter dormancy | Mildly toxic to pets |
| Cavendish's Trichocentrum | Bright indirect light (just back from a sunny window) | Every 7-10 days in growth; every 14-21 days during the winter rest | Pet-safe |
| Celosia argentea var. plumosa 'Fresh Look Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Century Yellow Feather Celosia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Cephalophyllum tricolorum | Direct sun (at least 4-6 hours) | Only when the soil is fully dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Cephalotus follicularis 'Eden Black' | Bright indirect light (just back from a sunny window) | Keep lightly moist; let the surface just begin to dry between waterings | Mildly toxic to pets |
| Ceratopteris thalictroides | Medium indirect light (a couple of metres from a window) | Permanently submerged; 25-40% water change weekly | Mildly toxic to pets |
| Chain Pleurothallis | Bright indirect light (just back from a sunny window) | Every 2-3 days; do not allow to dry completely | Pet-safe |
| Chalk Milkwort | Direct sun (at least 4-6 hours) | Infrequently; drought-tolerant once established | Mildly toxic to pets |
| Chamaeranthemum gaudichaudii | Medium indirect light (a couple of metres from a window) | Keep consistently moist, watering when the surface just begins to dry, about every 4-6 days | Mildly toxic to pets |
| Chamaeranthemum venosum | Medium indirect light (a couple of metres from a window) | Keep evenly moist, watering as the surface starts to dry, about every 4-6 days | Mildly toxic to pets |
| Chanet's Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; monthly or less in winter | Pet-safe |
| Chaparensis Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in cooler seasons | Pet-safe |
| Cheiridopsis candidissima | Direct sun (at least 4-6 hours) | Autumn through spring; keep dry during summer dormancy | Mildly toxic to pets |
| Cheiridopsis denticulata | Direct sun (at least 4-6 hours) | Autumn through spring; keep dry through summer dormancy | Mildly toxic to pets |
| Cheiridopsis pillansii | Direct sun (at least 4-6 hours) | Only during autumn-to-spring growth when soil is fully dry; near-zero in summer dormancy | Mildly toxic to pets |
| Cheiridopsis robusta | Direct sun (at least 4-6 hours) | During autumn-spring growth when soil is bone dry; withhold through summer | Mildly toxic to pets |
| Cheiridopsis turbinata | Direct sun (at least 4-6 hours) | In autumn-spring growth once soil is fully dry; minimal in summer dormancy | Mildly toxic to pets |
| Chilean Blue Crocus | Direct sun (at least 4-6 hours) | Regular watering during the spring growing season; completely dry from late spring through late autumn | Mildly toxic to pets |
| Chilean Butterwort | Bright indirect light (just back from a sunny window) | Water from below by brief tray sitting every 5-10 days when the soil surface begins to dry; dry out slightly between waterings in winter | Pet-safe |
| Chiltern Gentian | Direct sun (at least 4-6 hours) | Minimal supplementary watering needed; moderate natural rainfall is adequate | Mildly toxic to pets |
| Chimera Dragon Orchid | Medium indirect light (a couple of metres from a window) | Continuously moist; water every 1–2 days; never allow to dry out | Pet-safe |
| Chin Cactus | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn; withhold in winter | Pet-safe |
| Chin Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| Chinese Brake Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days in spring and summer | Mildly toxic to pets |
| Chinese Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (spring–summer); sparingly in winter | Pet-safe |
| Chinese Jade | Bright indirect light (just back from a sunny window) | Every 2–4 weeks (allow soil to dry completely between waterings) | Mildly toxic to pets |
| Chinese money plant | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 7-10 days | Pet-safe |
| Chinese Tylecodon | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); minimal or none in summer | Toxic to pets |
| Chionodoxa luciliae | Direct sun (at least 4-6 hours) | Rainfall in most settings; rarely needs watering | Mildly toxic to pets |
| Chirita 'Aiko' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 7-10 days | Mildly toxic to pets |
| Chirita micromusa | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the soil surface just begins to dry, roughly every 4-7 days | Pet-safe |
| Chirita sinensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Mildly toxic to pets |
| Chive-Leaved Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Mildly toxic to pets |
| Christmas 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 Jewels Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup weekly; water soil every 2–3 weeks | Pet-safe |
| Cigarette Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through early spring; none or near-none in summer | Pet-safe |
| Cilician 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 |
| Cistus-Flowered Sundew | Direct sun (at least 4-6 hours) | Water regularly via the tray method throughout autumn–spring active growth; cease watering entirely from late spring through summer dormancy. | Pet-safe |
| Clamshell Orchid | Medium indirect light (a couple of metres from a window) | Every 5–7 days; allow the mix to almost dry before rewetting | Pet-safe |
| Clamshell Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; every 10–14 days in winter | Pet-safe |
| Cleft Antegibbaeum | Direct sun (at least 4-6 hours) | When the leaves begin to wrinkle slightly, roughly every 14-21 days in the growing season (autumn-spring); almost none in summer dormancy | Mildly 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 African violet | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Cliff African Violet | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Cliff Brake Fern | Bright indirect light (just back from a sunny window) | Allow the top half of the soil to dry out between waterings, roughly every 10-14 days | Mildly toxic to pets |
| Cloth of Gold Saxifrage | Medium indirect light (a couple of metres from a window) | Every 5–7 days; reduce in winter | Pet-safe |
| Cloud Liveforever | Direct sun (at least 4-6 hours) | Every 1–2 weeks in cool season (October–April); completely withheld June–September | Pet-safe |
| Clubmoss cassiope | Bright indirect light (just back from a sunny window) | Regularly; soil should remain consistently moist throughout the growing season | Pet-safe |
| Clustered Dendrobium | Bright indirect light (just back from a sunny window) | Every 5-7 days in summer; reduce sharply to monthly or less in winter | Pet-safe |
| Clustered Dunce Cap | Direct sun (at least 4-6 hours) | Weekly to fortnightly in active growth (spring–autumn); minimal in winter dormancy | Pet-safe |
| Clustered Silver Skin | Direct sun (at least 4-6 hours) | Every 2–4 weeks during autumn–early winter growth; minimal in spring; completely withheld in summer | Pet-safe |
| Clustered Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days during the growing season; withhold entirely during dormancy | Pet-safe |
| Clustered Specklinia | Bright indirect light (just back from a sunny window) | Every 2-3 days; keep medium consistently moist | Pet-safe |
| Coarctata Haworthia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Coast Rock Cress | Direct sun (at least 4-6 hours) | Weekly in the growing season; reduce to monthly or less when summer-dormant | Pet-safe |
| Cob Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; virtually none in winter | Pet-safe |
| Cobweb Houseleek | Direct sun (at least 4-6 hours) | When soil is fully dry, every 10-14 days in growth; sparingly in winter | Pet-safe |
| Coconut-Scented Bulbophyllum | Medium indirect light (a couple of metres from a window) | Every 3–4 days during growth; every 6–10 days in winter | Pet-safe |
| Cocoon Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during active growth (spring and autumn); once a month in summer and winter | Toxic to pets |
| Coelogyne nitida | Bright indirect light (just back from a sunny window) | Water 2-3 times weekly in growth; reduce to roughly weekly in the cool winter rest | Mildly 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 |
| Coin-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; reduce to every 2–3 weeks in winter | Pet-safe |
| Colima Butterwort | Bright indirect light (just back from a sunny window) | Water every 5–7 days; allow the surface to slightly dry between waterings | Pet-safe |
| Columbia Lewisia | Bright indirect light (just back from a sunny window) | Moderate; reduce in late summer and winter | Mildly toxic to pets |
| Columbian Peperomia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Column Aubrieta | Direct sun (at least 4-6 hours) | Weekly during spring growth; very sparingly in summer | Pet-safe |
| Common African Violet | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of potting mix is dry, roughly every 7-10 days | Pet-safe |
| Common blue violet | Medium indirect light (a couple of metres from a window) | Every 5–10 days; tolerates wet soil | Pet-safe |
| Common Butterwort | Bright indirect light (just back from a sunny window) | Keep permanently wet in the growing season; stand in shallow pure water | Mildly toxic to pets |
| Common Foxtail Cactus | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 10-21 days in summer; very sparingly in winter | Pet-safe |
| Common Grape Hyacinth | Bright indirect light (just back from a sunny window) | Weekly in spring during active growth; dry during summer dormancy | Mildly 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 Hepatica | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; reduce in summer dormancy | Mildly 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 Milkwort | Direct sun (at least 4-6 hours) | Rarely; drought-tolerant once established | Mildly 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 Saltmarsh Grass | Direct sun (at least 4-6 hours) | Tidal — periodic saltwater flooding | Pet-safe |
| Common Snowdrop | Medium indirect light (a couple of metres from a window) | Naturally moisture-retentive soil; supplemental watering in dry spells during growth | Toxic to pets |
| Common Star of Bethlehem | Direct sun (at least 4-6 hours) | Low; self-sufficient in a UK garden once established | Toxic to pets |
| Common Stork's Bill | Direct sun (at least 4-6 hours) | Naturally rain-fed; no supplemental watering needed for wild or meadow plantings | Mildly toxic to pets |
| Common Water Hyacinth | Direct sun (at least 4-6 hours) | Free-floating aquatic — roots permanently submerged in open water | Pet-safe |
| Common Water Starwort | Medium indirect light (a couple of metres from a window) | Permanently submerged or marginal | Pet-safe |
| Common Water Starwort | Medium indirect light (a couple of metres from a window) | Fully submerged or surface-floating — permanent aquatic | Mildly toxic to pets |
| Compact Angraecum | Bright indirect light (just back from a sunny window) | Every 2–4 days in summer; every 7–14 days in winter | Pet-safe |
| Compact bog rosemary | Bright indirect light (just back from a sunny window) | Consistently moist; never allow to dry out | Toxic to pets |
| Comparettia falcata | Bright indirect light (just back from a sunny window) | Keep roots evenly moist, watering as they approach (but before they reach) dryness, often every 2-3 days | Mildly toxic to pets |
| Compressed Peperomia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks (allow compost to dry substantially between waterings) | Pet-safe |
| Compton's Gibbaeum | Direct sun (at least 4-6 hours) | Every 2–4 weeks in autumn and spring (active growth); withheld or near-dry in summer and reduced in winter | Pet-safe |
| Compton's Living Stone | Direct sun (at least 4-6 hours) | Sparingly every 2-4 weeks in summer; none from late autumn through winter leaf renewal | Pet-safe |
| Concrete Leaf | Direct sun (at least 4-6 hours) | Sparingly; every 1-2 weeks in active growth (autumn/spring), nearly dry in summer and winter | Mildly toxic to pets |
| Confetti Polka Dot Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce in winter | Pet-safe |
| Confused Huernia | Bright indirect light (just back from a sunny window) | Every 14–21 days during active growth (spring–autumn); once monthly or less in winter | Pet-safe |
| Conophytum (Living Pebbles) | Bright indirect light (just back from a sunny window) | Only when soil is bone-dry during the autumn-to-spring growth season; keep nearly dry in summer dormancy | Mildly toxic to pets |
| Conophytum Calculus | Bright indirect light (just back from a sunny window) | During autumn-to-spring growth, every 1-2 weeks; none through summer dormancy | Mildly toxic to pets |
| Conophytum ficiforme | Bright indirect light (just back from a sunny window) | Lightly in autumn and winter when in growth; keep dry through summer dormancy | Mildly toxic to pets |
| Conophytum Minutum | Bright indirect light (just back from a sunny window) | During the cool-season growth (autumn to spring), every 1-2 weeks; kept dry through summer dormancy | Mildly toxic to pets |
| Conophytum Obcordellum | Bright indirect light (just back from a sunny window) | Seasonally; water in autumn and winter growth, keep dry through summer dormancy | Mildly toxic to pets |
| Conophytum Pageae | Bright indirect light (just back from a sunny window) | Through autumn-to-spring growth, every 1-2 weeks; withheld over summer dormancy | Mildly toxic to pets |
| Conophytum Pellucidum | Bright indirect light (just back from a sunny window) | During autumn-to-spring growth, every 1-2 weeks; withheld over summer dormancy | Mildly toxic to pets |
| Conophytum Uviforme | Bright indirect light (just back from a sunny window) | Only during the cool autumn-to-spring growing season, roughly every 10-14 days when soil is dry; kept dry in summer | Mildly toxic to pets |
| Conophytum wettsteinii | Bright indirect light (just back from a sunny window) | Lightly in autumn and winter during growth; keep dry through summer dormancy | Mildly toxic to pets |
| Constricted Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in summer heat; every 2–3 days in cooler months | Pet-safe |
| Cooper's Haworthia | Bright indirect light (just back from a sunny window) | Every 1-3 weeks in spring/summer; about once a month in winter | Pet-safe |
| Cooper's Haworthia (Pilifera) | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Copiapoa cinerea | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; little to none in winter | Pet-safe |
| Copiapoa humilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep bone-dry in winter | Pet-safe |
| Copiapoa hypogaea | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; little to none in winter | Pet-safe |
| Copiapoa krainziana | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Copper Angel Masdevallia | Medium indirect light (a couple of metres from a window) | 2–3 times per week; keep substrate slightly moist | Pet-safe |
| Copper Leaf Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce significantly in dormancy | Pet-safe |
| Copper Rain Lily | Direct sun (at least 4-6 hours) | Low to moderate; rain-triggered | Toxic to pets |
| Coquimbo Copiapoa | Direct sun (at least 4-6 hours) | Every 14-21 days in summer; once a month or less in winter | Pet-safe |
| Coral Bells 'Electra' | 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 | Pet-safe |
| Coral Bells 'Lime Rickey' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil feels dry, roughly every 5-7 days during active growth | Pet-safe |
| Coral Bells 'Obsidian' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, approximately every 5-7 days during the growing season | Pet-safe |
| Coris-Leaved St John's Wort | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Toxic to pets |
| Corkscrew Plant | Bright indirect light (just back from a sunny window) | Keep permanently wet — stand the pot in 2-4 cm of water at all times | Mildly toxic to pets |
| Corsican Heron's Bill | Direct sun (at least 4-6 hours) | Low — allow soil to dry between waterings | Mildly toxic to pets |
| Coryphantha Elephantidens | Bright indirect light (just back from a sunny window) | When the mix is fully dry, about every 1-2 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Coryphantha macromeris | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; keep dry in winter | Pet-safe |
| Coryphantha vivipara | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; none in winter | Pet-safe |
| 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 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 |
| 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 |
| Cowslip Orchid | Bright indirect light (just back from a sunny window) | Lightly during autumn to spring growth; completely dry during summer dormancy | Pet-safe |
| Crane's Bill Stork's Bill | Direct sun (at least 4-6 hours) | Water lightly; allow the soil surface to dry between waterings | Mildly toxic to pets |
| 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 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 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 Nudicaulis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Crassula Pyramidalis | Bright indirect light (just back from a sunny window) | Sparingly, only when soil is bone dry, roughly every 2-3 weeks in growth; nearly dry over summer rest | Toxic to pets |
| Crassula 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 |
| Crater Argyroderma | Direct sun (at least 4-6 hours) | Every 3–5 weeks in the autumn–winter growing period; none from May through August | Pet-safe |
| Creeping Globe Daisy | Direct sun (at least 4-6 hours) | Every 2–3 weeks when actively growing; minimal in winter | Pet-safe |
| Creeping Globularia | Direct sun (at least 4-6 hours) | Every 14 days during active growth; virtually none in winter. | Mildly toxic to pets |
| Creeping New Zealand Cranesbill | Direct sun (at least 4-6 hours) | Every 7–10 days in the growing season; minimal in winter | Pet-safe |
| Crested Catasetum | Direct sun (at least 4-6 hours) | Daily to every-other-day during growth; stop during dormancy | Pet-safe |
| Crested Gentian | Direct sun (at least 4-6 hours) | Regular; keep soil consistently moist during the growing season | Mildly toxic to pets |
| Crested Vanda | Bright indirect light (just back from a sunny window) | Daily to every other day in summer; every 3-5 days in winter | Pet-safe |
| Crocus | Direct sun (at least 4-6 hours) | Natural rainfall | Mildly toxic to pets |
| Crocus 'Jeanne d'Arc' | Direct sun (at least 4-6 hours) | Rely on natural rainfall; water only during a dry autumn after planting or a droughty spring | Mildly toxic to pets |
| Crocus 'Pickwick' | Direct sun (at least 4-6 hours) | Depend on rainfall; supplemental water only during a dry spell right after autumn planting or active spring growth | Mildly toxic to pets |
| Crocus chrysanthus 'Cream Beauty' | Direct sun (at least 4-6 hours) | Rely on rainfall; water only during a dry establishment period after planting or a droughty spring | Mildly toxic to pets |
| Crocus tommasinianus 'Ruby Giant' | Direct sun (at least 4-6 hours) | Rainfall-reliant; water only briefly during a dry autumn establishment or droughty early spring | Mildly toxic to pets |
| Cross Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once a month or less in winter | Pet-safe |
| Cross-leaved Heath Alba Mollis | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 5–7 days in dry spells | Pet-safe |
| Crown Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth; none from late autumn through winter | Pet-safe |
| Cryptanthus 'Black Mystic' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Cryptanthus 'Pink Starlight' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Pet-safe |
| Cryptanthus 'Ruby' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Cryptanthus acaulis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Cryptanthus bromelioides | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly weekly | Pet-safe |
| Cryptanthus zonatus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Cryptocoryne albida | Low light (north window or shaded room) | Fully submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Cryptocoryne beckettii | Low light (north window or shaded room) | Continuously submerged; 25-50% water change weekly | Mildly toxic to pets |
| Cryptocoryne lucens | Medium indirect light (a couple of metres from a window) | Continuously submerged; 25-50% water change weekly | Mildly 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 |
| Cryptocoryne parva | Medium indirect light (a couple of metres from a window) | Continuously submerged; 25-50% water change weekly | Mildly toxic to pets |
| Cryptocoryne pontederiifolia | Low light (north window or shaded room) | Permanently submerged; 25-30% weekly water change | Mildly toxic to pets |
| Cryptocoryne spiralis | Medium indirect light (a couple of metres from a window) | Continuously submerged; 25-50% water change weekly | Mildly toxic to pets |
| Cryptocoryne undulata | Low light (north window or shaded room) | Continuously submerged; 25-50% water change weekly | Mildly toxic to pets |
| Cryptocoryne wendtii 'Brown' | Low light (north window or shaded room) | Continuously submerged; 25-50% water change weekly | Mildly toxic to pets |
| Cryptocoryne wendtii 'Green' | Low light (north window or shaded room) | Submerged full-time; change 20-30% of tank water weekly | Mildly toxic to pets |
| Cryptocoryne wendtii 'Red' | Medium indirect light (a couple of metres from a window) | Continuously submerged; 25-50% water change weekly | Mildly toxic to pets |
| Crystal Butterwort | Bright indirect light (just back from a sunny window) | Water lightly every 5–10 days during the carnivorous growing phase; allow to nearly dry between waterings in summer succulent-leaf phase | Pet-safe |
| Crystal Palace lobelia | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, typically every 2-3 days in summer | Toxic to pets |
| Crystal 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 Melon Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 3-4 weeks in winter | Pet-safe |
| Curled Air Plant | Direct sun (at least 4-6 hours) | 2–4 times weekly in summer, weekly in winter | Pet-safe |
| 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 |
| Curly Racinaea | Bright indirect light (just back from a sunny window) | Mist thoroughly 3-4 times per week or submerge in water for 20 minutes twice weekly | Pet-safe |
| Cushion Aloe Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 7-12 days in summer, much less in winter | Pet-safe |
| Cushion Baby's Breath | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; very sparingly or not at all in winter | Mildly toxic to pets |
| Cushion Draba | Direct sun (at least 4-6 hours) | Sparingly; soil must dry between waterings | Pet-safe |
| Cushion Sandwort | Direct sun (at least 4-6 hours) | Sparingly; allow to dry between waterings | Pet-safe |
| Cushion Thrift | Direct sun (at least 4-6 hours) | Very low — drought-tolerant once established | Mildly toxic to pets |
| Cut Eye-leaf | Direct sun (at least 4-6 hours) | Every 2-3 weeks in the autumn-spring growing season when the body shows light wrinkling; completely dry in summer | Mildly toxic to pets |
| Cuthbertson's Dendrobium | Bright indirect light (just back from a sunny window) | When the medium surface begins to dry, roughly every 1-3 days | Pet-safe |
| Cutleaf Fleabane | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; very little in winter | Pet-safe |
| Cutleaf Toothwort | Medium indirect light (a couple of metres from a window) | Moderate during the active growth period (March–May); none needed once dormant in summer. | Pet-safe |
| 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 Rock Jasmine | Direct sun (at least 4-6 hours) | Very sparingly; almost none in winter | Pet-safe |
| Cymbidium Golden Elf 'Sundust' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in cooler months | Pet-safe |
| Cystopteris fragilis | Medium indirect light (a couple of metres from a window) | Keep evenly moist while in growth, watering when the top 1-2 cm of soil dries, roughly every 4-7 days | Mildly 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 |
| Daghestan Sage | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Dalstroem's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Daily misting or watering; roots must remain continuously moist but never waterlogged | Pet-safe |
| Danford Iris | Direct sun (at least 4-6 hours) | Moderate in late winter and early spring; dry in summer | Toxic to pets |
| Dark Catasetum | Bright indirect light (just back from a sunny window) | Regularly during growth; reduced but not stopped in winter | Pet-safe |
| Dark-purple Primulina | Medium indirect light (a couple of metres from a window) | When the top third of compost feels dry | Mildly toxic to pets |
| Darwin's Slipper | Bright indirect light (just back from a sunny window) | Moderately — water when the top of the compost is barely dry | Mildly toxic to pets |
| Darwin's Slipper Plant | Bright indirect light (just back from a sunny window) | When the top of the growing medium dries slightly | Mildly toxic to pets |
| Davis's Masdevallia | Medium indirect light (a couple of metres from a window) | When the medium surface barely begins to dry, roughly every 3-5 days | Pet-safe |
| Daybreak Red Stripe Treasure Flower | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| 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 '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 '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 |
| Debbie Graptoveria | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Deceptive Mammillaria | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Delicate Air Plant | Bright indirect light (just back from a sunny window) | Soak for 20–30 minutes once a week | Pet-safe |
| 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 |
| Delta Dracula | Medium indirect light (a couple of metres from a window) | Every 2-3 days, never allowing roots to dry out completely | Pet-safe |
| Delta Pure White pansy | Bright indirect light (just back from a sunny window) | Every 2–3 days in warm weather; weekly in cool, wet conditions | Pet-safe |
| Dendrobium 'Berry Oda' | Bright indirect light (just back from a sunny window) | When the bark is nearly dry, roughly every 5-7 days in growth | Pet-safe |
| Dendrochilum cobbianum | Bright indirect light (just back from a sunny window) | 2-3 times per week, allowing only slight drying between waterings | Pet-safe |
| Dendrochilum filiforme | Bright indirect light (just back from a sunny window) | 2-3 times per week, letting the medium dry only slightly between waterings | Pet-safe |
| Dendrochilum glumaceum | Bright indirect light (just back from a sunny window) | 2-3 times per week, letting the medium dry only slightly between waterings | Pet-safe |
| Denison's Vanda | Bright indirect light (just back from a sunny window) | Abundant watering in active growth (spring–summer); reduce to light morning fogging every few days in winter | Pet-safe |
| Dense Trichodiadema | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn and spring flowering seasons; reduced to monthly or less in summer and winter | Pet-safe |
| Derby Sundew | Bright indirect light (just back from a sunny window) | Standing tray method (growing season); reduced to near-dry (rest) | Pet-safe |
| Desert Privet Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Dianthus 'Mrs Sinkins' | Direct sun (at least 4-6 hours) | Water when the top few cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus deltoides | Direct sun (at least 4-6 hours) | Water when soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus gratianopolitanus 'Firewitch' | Direct sun (at least 4-6 hours) | Water when soil is dry; very drought-tolerant once established | Toxic to pets |
| Diapensia-Like Saxifrage | Direct sun (at least 4-6 hours) | Very low — water sparingly in spring and summer; virtually none in winter | Pet-safe |
| Dickie's Bladder Fern | Low light (north window or shaded room) | 2-3 times per week in the growing season; reduce in winter dormancy | Pet-safe |
| Didier's Angraecum | Bright indirect light (just back from a sunny window) | 3–5 times per week in summer; reduce markedly in December–January after flowering | Pet-safe |
| Dimpled Trout Lily | Medium indirect light (a couple of metres from a window) | Consistently moist from emergence to dormancy (late winter to late spring) | Mildly toxic to pets |
| Dinter's Eye Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through late winter; none in summer | Pet-safe |
| Dinter's Living Stone | Direct sun (at least 4-6 hours) | Every 2-4 weeks in summer growing season; none during autumn-winter leaf renewal | Pet-safe |
| Dinteranthus microspermus | Direct sun (at least 4-6 hours) | Sparingly in late-summer through autumn growth; near-dry the rest of the year | Pet-safe |
| Dinteranthus pole-evansii | Direct sun (at least 4-6 hours) | Minimal, only during late-summer to autumn growth; dry otherwise | Pet-safe |
| Dinteranthus puberulus | Direct sun (at least 4-6 hours) | Lightly in late-summer to autumn growth; near-dry the rest of the year | Pet-safe |
| Dinteranthus vanzylii | Direct sun (at least 4-6 hours) | Sparingly during late-summer to autumn growth; dry otherwise | Pet-safe |
| Dionaea muscipula 'Akai Ryu' | Direct sun (at least 4-6 hours) | Keep permanently wet; stand in 1-2 cm of pure water while growing | Pet-safe |
| Dionaea muscipula 'B52' | Direct sun (at least 4-6 hours) | Keep permanently wet; stand in 1-2 cm of pure water in the growing season | Pet-safe |
| Dionaea muscipula 'Cupped Trap' | Direct sun (at least 4-6 hours) | Keep media constantly damp; sit in 1-2 cm of water in the growing season, less in dormancy | Pet-safe |
| Dionaea muscipula 'Dentate Traps' | Direct sun (at least 4-6 hours) | Keep constantly moist; tray-water with pure water | Pet-safe |
| Dionaea muscipula 'Red Dragon' | Direct sun (at least 4-6 hours) | Keep constantly moist; tray-water with pure water | Pet-safe |
| Disc Cactus | Direct sun (at least 4-6 hours) | When the mix has been completely dry for a few days, roughly every 14-21 days in summer; almost no water from October to March | Pet-safe |
| Distant-Flowered Dyckia | Direct sun (at least 4-6 hours) | Only when the potting mix is completely dry, roughly every 14-21 days in summer and every 30-45 days in winter | Mildly toxic to pets |
| Divergent Vanheerdea | Direct sun (at least 4-6 hours) | Every 14-21 days in the autumn-spring growing season when the leaves show slight wrinkling; completely dry in summer | Mildly toxic to pets |
| Dodson's Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting or every 1-2 days; never allow to dry out | Pet-safe |
| Dog's Tooth Violet | Medium indirect light (a couple of metres from a window) | Moderate during active growth; minimal when dormant | Mildly toxic to pets |
| Dollbaby miniature gloxinia | Bright indirect light (just back from a sunny window) | Every 5–8 days; keep evenly moist but never waterlogged | Pet-safe |
| Dorothy's Living Stone | Direct sun (at least 4-6 hours) | Every 2-3 weeks in summer (active growth); none from mid-autumn to late spring during rest | Pet-safe |
| Dorothy's Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water only when the new leaf pair is actively growing (late summer to autumn); completely dry at all other times | Pet-safe |
| Dotted Neoregelia | Medium indirect light (a couple of metres from a window) | Maintain water in the central cup; water the potting medium lightly and allow it to dry slightly | Pet-safe |
| Dotted Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Double 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 Marsh Marigold | Bright indirect light (just back from a sunny window) | Permanently moist to standing water 0–5 cm deep | Mildly 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 |
| Douglas's Phlox | Direct sun (at least 4-6 hours) | Low to moderate — allow soil to partially dry between waterings | Mildly toxic to pets |
| Dove Masdevallia | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; the root zone must remain continuously moist | Pet-safe |
| Dove's-Foot Cranesbill | Direct sun (at least 4-6 hours) | Low; water only during extended drought | Pet-safe |
| Downy Painted Cup | Direct sun (at least 4-6 hours) | Infrequently, once established | Mildly toxic to pets |
| Downy Rock Jasmine | Direct sun (at least 4-6 hours) | Very sparingly; nearly dry between waterings | Mildly toxic to pets |
| Downy Yellow Violet | Medium indirect light (a couple of metres from a window) | Regular; keep evenly moist | Pet-safe |
| Dreaming Air Plant | Medium indirect light (a couple of metres from a window) | Mist 2–3 times per week; soak weekly | Pet-safe |
| 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 |
| Drosera anglica | Direct sun (at least 4-6 hours) | Keep constantly saturated; stand in 1-3 cm of pure water through the growing season | Pet-safe |
| Drosera binata 'Multifida Extrema' | Direct sun (at least 4-6 hours) | Keep media constantly wet; stand in 1-2 cm of water via the tray method in growth, drier in winter | Mildly toxic to pets |
| Drosera burmanni | Direct sun (at least 4-6 hours) | Keep media constantly wet; stand in 1-2 cm of pure water at all times in growth | Pet-safe |
| Drosera capensis 'Alba' | Bright indirect light (just back from a sunny window) | Keep constantly wet, standing the pot in 1-2 cm of water (tray method) at all times | Pet-safe |
| Drosera capensis 'Red' | Direct sun (at least 4-6 hours) | Keep media constantly wet; stand in 1-2 cm of water year-round via the tray method | Mildly toxic to pets |
| Drosera Filiformis | Direct sun (at least 4-6 hours) | Keep permanently wet; stand the pot in 1-2 cm of pure water during the growing season | Mildly toxic to pets |
| Drosera intermedia | Direct sun (at least 4-6 hours) | Keep permanently saturated; stand in 1-3 cm of pure water at all times during growth | Pet-safe |
| Drosera schizandra | Low light (north window or shaded room) | Keep media permanently moist but not waterlogged; mist or top-water with pure water frequently | Pet-safe |
| Drosera tokaiensis | Bright indirect light (just back from a sunny window) | Keep media constantly wet; stand in 1-2 cm of pure water at all times in growth | Pet-safe |
| dryas primulina | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring–summer; every 14–21 days in winter | Pet-safe |
| Duclouxs Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; sparingly in winter | Pet-safe |
| 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 |
| Duvalia caespitosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Duvalia corderoyi | Bright indirect light (just back from a sunny window) | When soil is completely dry, about every 10-14 days in summer; keep dry in winter | Mildly toxic to pets |
| Duvalia polita | Bright indirect light (just back from a sunny window) | When soil is fully dry, around every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Dwarf Antimima | Bright indirect light (just back from a sunny window) | Sparingly in summer; moderately in autumn–spring | Pet-safe |
| Dwarf Anubias | Low light (north window or shaded room) | Permanently aquatic or emersed in high-humidity environments; stable water conditions maintained with regular partial water changes | Mildly toxic to pets |
| Dwarf Baby Tears | Direct sun (at least 4-6 hours) | Fully submerged — permanent aquatic plant | Pet-safe |
| Dwarf Bearded Iris | Direct sun (at least 4-6 hours) | Weekly during active growth; minimal in summer dormancy | Mildly toxic to pets |
| Dwarf Cape Primrose | Bright indirect light (just back from a sunny window) | every 5–8 days in the growing season, every 10–14 days in winter | Pet-safe |
| Dwarf Caribbean gesneria | Bright indirect light (just back from a sunny window) | Every 4–7 days; do not allow to dry out | Pet-safe |
| Dwarf Chin Cactus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Dwarf Chirita | Bright indirect light (just back from a sunny window) | Every 7–10 days | Pet-safe |
| Dwarf Crocus | Direct sun (at least 4-6 hours) | Very low — dry Mediterranean dormancy essential; water only at planting and rely on winter rainfall | Mildly toxic to pets |
| Dwarf Edraianthus | Direct sun (at least 4-6 hours) | Low — allow to dry thoroughly between waterings | Mildly toxic to pets |
| Dwarf Frailea | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 12-16 days in summer | Pet-safe |
| Dwarf Henckelia | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season; reduce in winter | Pet-safe |
| Dwarf Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil feels dry, roughly every 5-7 days in summer | Pet-safe |
| Dwarf Horsetail | Medium indirect light (a couple of metres from a window) | Consistently wet; stand pot in water tray | Mildly toxic to pets |
| Dwarf Kacip Fatimah | Low light (north window or shaded room) | Water when the top 1 cm of medium is drying; every 4–6 days in warm conditions, less frequently in cooler or lower-light conditions | Mildly toxic to pets |
| Dwarf Lady's Mantle | Bright indirect light (just back from a sunny window) | Weekly during the growing season; established plants tolerate some drought | Pet-safe |
| Dwarf Lewisia | Direct sun (at least 4-6 hours) | Moderate during spring growth; completely dry in summer | Pet-safe |
| Dwarf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Dwarf 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 Rose-stripe Star | Bright indirect light (just back from a sunny window) | Water soil when top 2-3 cm dries out, roughly every 7-10 days | Pet-safe |
| Dwarf Rose-Stripe Star | Medium indirect light (a couple of metres from a window) | Water when the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Dwarf Solomon's Seal | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; less when dormant | Mildly toxic to pets |
| Dwarf Sweet Flag | Medium indirect light (a couple of metres from a window) | Permanently moist to wet; tolerate shallow submersion | Pet-safe |
| Dwarf Sweet Flag | Bright indirect light (just back from a sunny window) | Keep soil permanently moist; water as soon as the surface feels barely dry | Mildly toxic to pets |
| Dwarf Tongue Plant | Direct sun (at least 4-6 hours) | Every 3–4 weeks during the growing season; once a month or less in winter | Pet-safe |
| Dwarf Trillium | Low light (north window or shaded room) | Keep soil consistently moist from spring emergence until dormancy; minimal watering once dormant | Mildly 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 Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; every 3–4 days in winter | Pet-safe |
| Dwarf Water Clover | Medium indirect light (a couple of metres from a window) | Permanently submerged or in saturated substrate | Mildly toxic to pets |
| Dyckia leptostachya | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Dyer's Air Plant | Medium indirect light (a couple of metres from a window) | Daily misting plus weekly soak | Pet-safe |
| Dyer's Ice Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growing season; reduce to monthly or less in winter | Pet-safe |
| Dynastes Masdevallia | Medium indirect light (a couple of metres from a window) | Water when medium approaches dryness, roughly every 1-2 days in warm months | Pet-safe |
| Early Squill | Direct sun (at least 4-6 hours) | Water during active growth; keep drier in summer | Toxic to pets |
| Earth Star | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm of mix is dry, roughly every 5-7 days | Pet-safe |
| Earth-colored Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during the active autumn-to-spring period; none in summer | Pet-safe |
| Easter Lily Cactus | Direct sun (at least 4-6 hours) | When the top of the soil dries, roughly weekly to fortnightly in summer; keep almost dry in winter | Pet-safe |
| Eastern 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 |
| Ebracteola montis-moltkei | Direct sun (at least 4-6 hours) | Only when soil is fully dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Echeveria | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer | Pet-safe |
| Echeveria 'Afterglow' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria 'Blue Atoll' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Chroma' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and much less in winter | Pet-safe |
| Echeveria 'Cubic Frost' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Dondo' | Direct sun (at least 4-6 hours) | When the soil is fully dry, around every 10-14 days in summer, sparingly in winter | Pet-safe |
| Echeveria 'Duchess of Nürnberg' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Ice Green' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Echeveria 'Lola' | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in the growing season; much less in winter | Pet-safe |
| Echeveria 'Lola' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Echeveria 'Meridian' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Echeveria 'Minima' | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 1-2 weeks in summer | Pet-safe |
| Echeveria 'Mira' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and rarely in winter | Pet-safe |
| Echeveria 'Neon Breakers' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria 'Orion' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Echeveria 'Perle d'Azur' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, much less in winter | Pet-safe |
| Echeveria 'Perle von Nurnberg' | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth; less in winter | Pet-safe |
| Echeveria 'Perle von Nürnberg' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Purple Pearl' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-3 weeks in growth and much less in winter | Pet-safe |
| Echeveria 'Tarantula' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, much less in winter | Pet-safe |
| Echeveria 'Tsunami' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer | Pet-safe |
| Echeveria 'Violet Queen' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria agavoides | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria agavoides 'Ebony' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria colorata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria harmsii | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria lilacina | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Pet-safe |
| Echeveria pallida | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and much less in winter | Pet-safe |
| Echeveria pulidonis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria setosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria shaviana | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria strictiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, sparingly in winter | Pet-safe |
| Echeveria subsessilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and monthly in winter | Pet-safe |
| Echeveria subsessilis 'Morning Beauty' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer | Pet-safe |
| Echidna Orchid | Medium indirect light (a couple of metres from a window) | Daily misting if mounted; every 1–2 days if potted | Pet-safe |
| Echinacea 'Pixie Meadowbrite' | Direct sun (at least 4-6 hours) | Once or twice a week during establishment; every 10–14 days when established | Pet-safe |
| Echinocereus pectinatus | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Echinocereus rigidissimus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 12-16 days in growth; none in winter | Pet-safe |
| Echinodorus 'Vesuvius' | Medium indirect light (a couple of metres from a window) | Submerged aquatic; keep continuously underwater with a 25-30% water change weekly | Mildly toxic to pets |
| Echinodorus tenellus | Bright indirect light (just back from a sunny window) | Permanently submerged; 25-30% weekly water change | Mildly toxic to pets |
| Edelweiss | Direct sun (at least 4-6 hours) | Every 2–3 weeks; reduce to almost nothing in winter | Pet-safe |
| Eden Valley bell heather | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2–3 weeks once established | Pet-safe |
| Edithcolea grandis | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 10-14 days in warm growth; keep dry below 15C | Mildly toxic to pets |
| Ehlers' Butterwort | Bright indirect light (just back from a sunny window) | Careful watering from below; drier in winter | Pet-safe |
| Elegant Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Elegant Peacock Ginger | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil feels dry, roughly every 5-8 days in the growing season; cease watering during winter dormancy | Mildly toxic to pets |
| Elegant Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; reduce to every 3-4 weeks in winter | Pet-safe |
| Eleocharis acicularis | Bright indirect light (just back from a sunny window) | Permanently submerged; 25-50% weekly water changes | Mildly toxic to pets |
| Eleocharis parvula | Bright indirect light (just back from a sunny window) | Permanently submerged; 25-50% weekly water changes | Mildly toxic to pets |
| Eleocharis sp. 'Mini' | Bright indirect light (just back from a sunny window) | Fully submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Elkhorn Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in summer dormancy | Mildly toxic to pets |
| Elongated Sun Pitcher | Bright indirect light (just back from a sunny window) | Soil kept consistently moist to wet year-round; shallow tray method acceptable | Mildly toxic to pets |
| Elymaitic Rosularia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring/summer; monthly or less in autumn/winter | Mildly toxic to pets |
| 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 Spike Moss | Medium indirect light (a couple of metres from a window) | Keep the soil consistently, evenly moist — never let it dry out | Pet-safe |
| Empress of India Nasturtium | Direct sun (at least 4-6 hours) | When the top 3–5 cm of soil is dry, roughly every 7–10 days | Mildly toxic to pets |
| Encrusted Saxifrage | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; rarely in winter | Pet-safe |
| Endres's Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate continuously moist; water every 1–3 days or as sphagnum surface begins to dry slightly | Mildly toxic to pets |
| Engraved Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer through autumn (active growth); withheld or near-zero from May through August | Pet-safe |
| Entire-leaved Primrose | Direct sun (at least 4-6 hours) | Every 7–10 days in spring; minimal in summer and winter | Mildly toxic to pets |
| Epidendrum porpax | Bright indirect light (just back from a sunny window) | Keep evenly, lightly moist year-round; mist or water mounts daily to every few days | Pet-safe |
| Erect Moss Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days | Pet-safe |
| Ermine Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days during the growing season; once every 4-6 weeks or less in winter | Mildly toxic to pets |
| Ernest's Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during summer; reduce to once every 3-4 weeks in winter | Pet-safe |
| Ernst's Spurflower | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Eryngium planum 'Blue Hobbit' | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water new plants until rooted | Mildly toxic to pets |
| Erythronium 'Pagoda' | Bright indirect light (just back from a sunny window) | Keep soil cool and evenly moist in spring; never let bulbs dry out completely | Mildly toxic to pets |
| 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 |
| Eschscholzia californica 'Thai Silk Rose Chiffon' | Direct sun (at least 4-6 hours) | When the soil is dry several centimetres down, roughly every 7-14 days | Mildly toxic to pets |
| Escobar's Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep medium consistently moist | Pet-safe |
| Escobar's Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting or near-daily watering; substrate should never fully dry out | Pet-safe |
| Etched Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the autumn–spring growing period; completely dry through June–August | Pet-safe |
| 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 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 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 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 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 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 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 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 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 obesa subsp. symmetrica | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in active growth; nearly dry over winter | Toxic to pets |
| Euphorbia piscidermis | Direct sun (at least 4-6 hours) | Sparingly, only when bone dry, roughly every 3 weeks in growth, nearly none in winter | Toxic to pets |
| Euphorbia 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 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 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 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 |
| Everflame Hook Sedge | Direct sun (at least 4-6 hours) | Keep evenly moist; water weekly in dry weather and keep containers from drying out | Mildly toxic to pets |
| Exquisite Masdevallia | Medium indirect light (a couple of metres from a window) | Every 1–3 days depending on season and medium; do not allow to dry | Pet-safe |
| 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 |
| Fairies' Thimbles | Bright indirect light (just back from a sunny window) | Weekly during active growth; less in winter | Pet-safe |
| fairy aprons | Bright indirect light (just back from a sunny window) | Keep media constantly wet; use the tray method year-round | Pet-safe |
| Fairy Flax | Direct sun (at least 4-6 hours) | Low — rainfall is generally sufficient; water only during severe summer drought | Mildly toxic to pets |
| Falconer's Sundew | Bright indirect light (just back from a sunny window) | Deep tray (growing season); very reduced (rest) | Pet-safe |
| False Comb Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and essentially none in winter | Pet-safe |
| False Pereskia Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; reduce to every 3–4 weeks in winter | Pet-safe |
| False Peyote | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 14-21 days in summer; minimal or none in winter | Pet-safe |
| 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 |
| Fan Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week, or a 15–20 minute soak once a week | Pet-safe |
| Faucaria Bosscheana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growth and far less in winter | Mildly toxic to pets |
| Faucaria lupina | Direct sun (at least 4-6 hours) | When soil is fully dry, mainly in spring and autumn growth; reduce in summer and winter | Mildly toxic to pets |
| Faucaria Tuberculosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in active growth | Mildly toxic to pets |
| Feather Cactus | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; keep nearly dry in winter | Pet-safe |
| Feathery Air Plant | Bright indirect light (just back from a sunny window) | Mist lightly every 2–3 days in warm conditions; reduce to every 4–5 days in cooler weather. | Pet-safe |
| Fenestraria Aurantiaca | Direct sun (at least 4-6 hours) | Sparingly, roughly every 2-3 weeks during autumn-to-spring growth and withheld through summer dormancy | Mildly toxic to pets |
| Fenestraria Rhopalophylla | Direct sun (at least 4-6 hours) | Only when the leaves start to wrinkle, roughly every 2-3 weeks in active growth and almost never in summer dormancy | Mildly toxic to pets |
| 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 |
| Ferocactus glaucescens | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 14 days in summer; keep dry in winter | Pet-safe |
| Ferocactus latispinus | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 14 days in summer; keep dry in winter | Pet-safe |
| Few-fruited Tongue Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; once monthly or less in winter | Mildly toxic to pets |
| Few-Ribbed Matucana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, every 7-14 days in summer | Pet-safe |
| Few-Toothed Tiger Jaws | Direct sun (at least 4-6 hours) | Every 2–4 weeks during active growth (late summer–autumn); sparingly in winter and spring | Pet-safe |
| Fida's Weingartia | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in spring and summer; suspend almost entirely from mid-autumn through winter. | Pet-safe |
| Fiebrig's Crown Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days in spring and summer; every 4-6 weeks in autumn; minimal to none in winter | Pet-safe |
| Field marigold | Direct sun (at least 4-6 hours) | Weekly during dry spells; self-sufficient once established | Pet-safe |
| Field Wood Rush | Direct sun (at least 4-6 hours) | No supplemental watering needed in typical temperate climates; relies on natural rainfall | Pet-safe |
| Fiery Masdevallia | Bright indirect light (just back from a sunny window) | Daily in warm weather; every 3–5 days in cool/winter months | Pet-safe |
| Fiesta Double Pink Impatiens | Medium indirect light (a couple of metres from a window) | Keep compost evenly moist at all times; water every 1-2 days in warm weather as double-flowered types are slightly more moisture-demanding than singles | Mildly toxic to pets |
| Filmy Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in summer, every 4–5 days in winter | Pet-safe |
| Fine-lined Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days in autumn to early spring only; completely withheld in summer and mid-winter | Pet-safe |
| Finger Cactus | Direct sun (at least 4-6 hours) | When the soil has dried fully, roughly every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Finger Mesemb | Direct sun (at least 4-6 hours) | Every 14-21 days in autumn through spring when the substrate is fully dry; essentially none during summer dormancy | Mildly toxic to pets |
| Fingered Sedge | Low light (north window or shaded room) | Moderate; keep moist but not waterlogged | Pet-safe |
| Fire Crown Cactus | Direct sun (at least 4-6 hours) | When the mix is completely dry, about every 10-14 days in growth; withhold entirely in winter | Pet-safe |
| Firecracker plant | Bright indirect light (just back from a sunny window) | Every 4–7 days; never allow soil to dry fully | Pet-safe |
| Fishhook Barrel | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep dry in winter | Pet-safe |
| Fittonia | Medium indirect light (a couple of metres from a window) | When the top 1 cm of soil is dry, every 3-5 days | Pet-safe |
| Fittonia 'White Anne' | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, typically every 4-7 days | Pet-safe |
| Fitzgerald's Sarcochilus | Bright indirect light (just back from a sunny window) | Every 3-5 days during the growing season; every 7-10 days in cooler months | Pet-safe |
| Five-angled Pipewort | Direct sun (at least 4-6 hours) | Fully submerged; 30-40% water change weekly | Mildly toxic to pets |
| Flag Pansy Orchid | Bright indirect light (just back from a sunny window) | When the medium is nearly dry, roughly every 5-7 days in summer | Pet-safe |
| Flag-bearer Dendrobium | Bright indirect light (just back from a sunny window) | When medium begins to dry, approximately every 2-4 days in active growth | Pet-safe |
| 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 |
| Flat-Leaved Dyckia | Direct sun (at least 4-6 hours) | When the compost is completely dry, roughly every 14-21 days in summer | Pet-safe |
| Flat-Leaved Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; minimal in winter | Pet-safe |
| Flax-leaved Tulip | Direct sun (at least 4-6 hours) | Water during active growth; keep dry in summer | Toxic to pets |
| Fleshy Orbea | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 10-14 days in summer and monthly or less in winter | Mildly toxic to pets |
| Floating Aponogeton | Medium indirect light (a couple of metres from a window) | Permanently submerged bulb with floating leaves; fortnightly 20–25% water changes | Pet-safe |
| 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 |
| Florist's Gloxinia | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth; typically water once the top of the mix begins to dry, then taper off completely heading into dormancy. | Pet-safe |
| Fly-catching Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; allow the surface to barely begin to dry | Pet-safe |
| Flying Saucer Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly weekly to fortnightly in summer; keep nearly dry in winter | Pet-safe |
| Forbes' Glory of the Snow | Bright indirect light (just back from a sunny window) | Minimal once established; natural rainfall usually sufficient during growing season | Mildly toxic to pets |
| 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 |
| Forget-me-not | Medium indirect light (a couple of metres from a window) | Weekly watering | Pet-safe |
| Fork-leaved Sundew | Direct sun (at least 4-6 hours) | Keep permanently wet; stand the pot in 1-3 cm of water at all times | Mildly toxic to pets |
| Forked Spleenwort | Medium indirect light (a couple of metres from a window) | Sparingly — water only when the growing medium is dry | Mildly toxic to pets |
| Forrests Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; very sparingly in winter | Pet-safe |
| Four-angled cassiope | Bright indirect light (just back from a sunny window) | Regularly during the growing season; keep consistently moist but never waterlogged | Pet-safe |
| Four-Flowered Racinaea | Bright indirect light (just back from a sunny window) | Mist foliage thoroughly 3-4 times per week; soak weekly in warm water for 15-30 minutes | Pet-safe |
| Four-Leaf Water Clover | Bright indirect light (just back from a sunny window) | Aquatic — grows in shallow water or moist substrate permanently | Pet-safe |
| Fragrant Stomatium | Bright indirect light (just back from a sunny window) | Sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Franz's Living Stone | Direct sun (at least 4-6 hours) | Every 2-4 weeks in the summer growing season; completely dry from mid-autumn to late spring | Pet-safe |
| Freely Flowering Angraecum | Medium indirect light (a couple of metres from a window) | Every 3–5 days; avoid complete drying out | Pet-safe |
| Freesia refracta | Direct sun (at least 4-6 hours) | Water every 5-7 days during winter-spring growth, keeping the soil just moist | Pet-safe |
| French Marigold 'Durango' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, every 3-6 days; containers more often | Mildly toxic to pets |
| Fresh Look Red Cockscomb | Direct sun (at least 4-6 hours) | When the top 2–3 cm of soil is dry, roughly every 5–7 days | Pet-safe |
| Freyn's Pink | Direct sun (at least 4-6 hours) | Infrequent; drought-tolerant once established | Mildly toxic to pets |
| Friedrich's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn; none during summer dormancy | Pet-safe |
| Friedrich's Window Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn and spring; minimal to none in summer | Mildly toxic to pets |
| Friedrichsthals Copper Leaf | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; minimal in dormancy | Pet-safe |
| Fringed Cliff Stonecrop | Direct sun (at least 4-6 hours) | Every 14–21 days in the growing season; minimal in winter | Pet-safe |
| Fringed Coelogyne | Medium indirect light (a couple of metres from a window) | Every 7-10 days in the growing season; every 14-21 days in cooler months | Pet-safe |
| Fringed Miniature Stelis | Medium indirect light (a couple of metres from a window) | Daily or near-daily; roots must not dry completely between watering | Pet-safe |
| Fringed Stelis | Medium indirect light (a couple of metres from a window) | Every 1–3 days depending on mount or medium and ambient temperature | Pet-safe |
| Fringed-sepal Primulina | Medium indirect light (a couple of metres from a window) | Reduced in winter; moderate in spring and summer | Mildly toxic to pets |
| Frithia humilis | Direct sun (at least 4-6 hours) | When soil is fully dry during spring-summer growth; minimal in winter | Pet-safe |
| Frithia pulchra | Direct sun (at least 4-6 hours) | When soil is fully dry during spring-summer growth; sparing in winter | Pet-safe |
| Fritillaria meleagris | Direct sun (at least 4-6 hours) | Keep soil moist through spring growth; tolerates damp ground | Mildly toxic to pets |
| Fritz Luth Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in spring and summer; every 3–5 days in winter | Pet-safe |
| Fritz Luth Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in growing season; every 4–5 days in winter | Pet-safe |
| Front Range Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal in winter | Pet-safe |
| Fuchsia 'Lady Thumb' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost is dry, roughly every 5-7 days in active growth | Pet-safe |
| Fuller's Living Stone | Direct sun (at least 4-6 hours) | Only when the old lobe pair is fully shrivelled (summer dormancy) and during the active growing window autumn–spring; roughly every 14-21 days when active | Pet-safe |
| Fuller's Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; every 4-6 weeks or less in winter | Mildly toxic to pets |
| Fuller's Titanopsis | Direct sun (at least 4-6 hours) | Every 3–4 weeks in autumn/winter growing season; minimal in summer dormancy | Pet-safe |
| Fuller's Titanopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn to early spring; barely once a month in summer dormancy | Pet-safe |
| Furuse's Orostachys | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal watering in winter | Pet-safe |
| Fused Tooth Venus flytrap | Direct sun (at least 4-6 hours) | Continuously moist via tray method during growing season; damp only in dormancy | Pet-safe |
| Gaillardia 'Arizona Sun' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 7-10 days once established | Mildly toxic to pets |
| Gaillardia 'Fanfare' | Direct sun (at least 4-6 hours) | Once a week during establishment; every 14 days or less once established in the ground | Mildly toxic to pets |
| Gaillardia 'Goblin' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days once established | Mildly toxic to pets |
| Gaillardia 'Mesa Red' | Direct sun (at least 4-6 hours) | Once or twice weekly during establishment; once every 14 days or less when established | Mildly toxic to pets |
| Gaillardia 'Mesa Yellow' | Direct sun (at least 4-6 hours) | Once or twice a week during establishment; every 14 days or less when established | Mildly toxic to pets |
| Gaillardia 'SpinTop Orange Halo' | Direct sun (at least 4-6 hours) | Once or twice a week during establishment; once every 10–14 days when established; check containers every 3–4 days in summer | Mildly toxic to pets |
| Gaillardia 'Tizzy' | Direct sun (at least 4-6 hours) | Once a week during establishment; every 14 days or less when established in the ground; check every 3–5 days in containers | Mildly toxic to pets |
| Galanga Resurrection Lily | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil feels dry, roughly every 5-7 days in the growing season; reduce significantly or cease in winter dormancy | Mildly toxic to pets |
| Garden Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7-10 days in active growth; reduce to every 3-4 weeks in winter | Pet-safe |
| Garden Pink 'Mrs Sinkins' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Gargoyle Lepanthes | Medium indirect light (a couple of metres from a window) | Every 1–2 days; medium should be moist but not sodden | Pet-safe |
| Gasteria Armstrongii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Glomerata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Nitida | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Pulchra | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gazania × hybrida 'Tiger Stripes' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Gazania rigens 'Daybreak Garden Sun' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Geneva Bugle | Bright indirect light (just back from a sunny window) | Once weekly during establishment; every 10–14 days once established | Mildly toxic to pets |
| Geogenanthus Undatus | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Mildly toxic to pets |
| Geranium cinereum 'Ballerina' | Direct sun (at least 4-6 hours) | When the top few centimetres of soil are dry; sparingly once established | Mildly toxic to pets |
| Geranium cinereum 'Lawrence Flatman' | Direct sun (at least 4-6 hours) | When the top few centimetres are dry; keep on the dry side once established | Mildly toxic to pets |
| Geranium cinereum var. subcaulescens | Direct sun (at least 4-6 hours) | When the top few centimetres of soil are dry; sparingly once established | Mildly toxic to pets |
| Geranium renardii | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm dries; drought-tolerant once established, roughly every 10-14 days in growing season | Mildly toxic to pets |
| Gesine's Living Stone | Direct sun (at least 4-6 hours) | Approximately every 14-21 days during the autumn-spring active period only; none in summer dormancy | Pet-safe |
| Geum 'Scarlet Tempest' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; keep evenly moist in summer | Mildly toxic to pets |
| Geyer's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active growth (autumn to early spring); none in summer | Pet-safe |
| Giant Autumn Daffodil | Direct sun (at least 4-6 hours) | Minimal water during autumn–spring growth; bone dry in summer | Toxic to pets |
| Giant 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 Chin Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-14 days in summer; every 4-6 weeks in winter | Pet-safe |
| Giant Dragon Orchid | Low light (north window or shaded room) | Daily or every other day | Pet-safe |
| 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 |
| Gibbaeum album | Bright indirect light (just back from a sunny window) | Lightly in autumn through spring during growth; keep nearly dry in summer | Mildly toxic to pets |
| Gibbaeum heathii | Direct sun (at least 4-6 hours) | Sparingly in autumn-spring growth; near-zero through summer dormancy | Mildly toxic to pets |
| Gibbaeum petrense | Direct sun (at least 4-6 hours) | Light watering in autumn-spring; withhold through summer | Mildly toxic to pets |
| Gibbaeum velutinum | Direct sun (at least 4-6 hours) | Moderate in autumn-spring; minimal in summer | Mildly toxic to pets |
| Gilbert Peacock Ginger | 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 active growth | Mildly toxic to pets |
| Girard's Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Mildly toxic to pets |
| Glacier Pink | Direct sun (at least 4-6 hours) | Low; water very sparingly, letting the soil nearly dry out between waterings | Mildly toxic to pets |
| Glandular Heron's Bill | Direct sun (at least 4-6 hours) | Water sparingly; allow soil to dry almost completely between waterings | Mildly toxic to pets |
| Glandular Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly or not at all in winter | Pet-safe |
| Glandular-stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; monthly in winter | Mildly toxic to pets |
| Globe candytuft | Direct sun (at least 4-6 hours) | Every 7–10 days; keep evenly moist but not waterlogged | Pet-safe |
| Glory of Texas Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and once every 5-6 weeks in winter | Pet-safe |
| Glory of the Snow | Bright indirect light (just back from a sunny window) | Low; relies on natural rainfall in most temperate gardens | Mildly toxic to pets |
| Glossostigma elatinoides | Bright indirect light (just back from a sunny window) | Fully submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Goat's Horn Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep dry from late autumn through winter | Pet-safe |
| Goat's Horn Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Goehring's Dyckia | Direct sun (at least 4-6 hours) | When the compost is completely dry, roughly every 14-21 days in growing season | Pet-safe |
| Goeppertia White Fusion | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Golden Bow Dendrobium | Bright indirect light (just back from a sunny window) | Plentiful in warm summer growth; markedly reduced and near-dry over a cool winter rest | Pet-safe |
| Golden Cliff Stonecrop | Direct sun (at least 4-6 hours) | Every 10–14 days in spring and autumn; monthly in summer; very sparingly in winter | Pet-safe |
| Golden Corkscrew Plant | Bright indirect light (just back from a sunny window) | Keep medium permanently saturated; tray method with 1–2 cm standing water | Pet-safe |
| Golden Crocus | Direct sun (at least 4-6 hours) | Minimal supplemental water needed; relies on natural rainfall; ensure summer-dry conditions for corm dormancy | Mildly toxic to pets |
| Golden Easter Lily Cactus | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is completely dry, roughly every 10-14 days in the growing season; once a month or less in winter. | Pet-safe |
| Golden Eriosyce | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is completely dry, every 10-14 days in summer | Pet-safe |
| golden fescue | Direct sun (at least 4-6 hours) | Low; water every 10–14 days during the growing season, less in winter | Pet-safe |
| Golden Japanese Sweet Flag | Bright indirect light (just back from a sunny window) | Keep the soil constantly moist to wet; water as soon as the surface begins to dry, often every 2-4 days | Mildly toxic to pets |
| Golden Japanese Sweet Flag | Medium indirect light (a couple of metres from a window) | Keep constantly moist; tolerate standing water | Pet-safe |
| Golden Lace Cactus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 2-3 weeks in summer; keep nearly dry in winter | Pet-safe |
| Golden Powder Puff | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Golden Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–4 weeks when established; very little in winter | Pet-safe |
| Golden Star Cactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Golden-flowered Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; minimally in winter | Pet-safe |
| Golden-Net Plant | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 7–10 days in winter | Pet-safe |
| Gongora galeata | Bright indirect light (just back from a sunny window) | When the medium nears dryness in growth; sparingly during winter rest | Mildly toxic to pets |
| Good Luck 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 during active growth | Mildly toxic to pets |
| Graptopetalum bellum | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 12-16 days in growth, very little in winter | Pet-safe |
| Graptopetalum macdougallii | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 12-16 days in summer, minimal in winter | Pet-safe |
| Graptopetalum rusbyi | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Graptoveria 'Bashful' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, sparingly in winter | Mildly toxic to pets |
| Graptoveria 'Debbie' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, minimal in winter | Mildly toxic to pets |
| Graptoveria 'Fred Ives' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Graptoveria 'Opalina' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, sparingly in winter | Mildly toxic to pets |
| Graptoveria 'Silver Star' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, minimal in winter | Mildly toxic to pets |
| Graptoveria 'Titubans' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| grass-leaved bladderwort | Direct sun (at least 4-6 hours) | Permanently submerged in shallow aquarium or terrarium water column | Pet-safe |
| Grass-Leaved Edraianthus | Direct sun (at least 4-6 hours) | Low — allow soil to partially dry between waterings | Mildly toxic to pets |
| Grasshopper Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; near-dry rest in winter | Pet-safe |
| Grayleaf Cranesbill | Direct sun (at least 4-6 hours) | Every 7–10 days when dry; very sparingly in winter | Pet-safe |
| 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 |
| Greek Jancaea | Medium indirect light (a couple of metres from a window) | Little and often to keep root zone moist; almost dry during winter dormancy | Pet-safe |
| Green Cliff Brake Fern | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, roughly every 7-10 days in summer and every 14 days in winter | Pet-safe |
| Green Rock Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is completely dry, roughly every 10-14 days | Pet-safe |
| 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 Spleenwort | Medium indirect light (a couple of metres from a window) | When the top centimetre of soil dries out | Pet-safe |
| Green Wave Fern | Low light (north window or shaded room) | Keep substrate or roots consistently moist; for aquarium use, submerge fully and maintain water changes | Pet-safe |
| Green-flowered Pitaya | Direct sun (at least 4-6 hours) | Every 2–4 weeks in spring and summer; essentially dry in winter | Mildly toxic to pets |
| Green-winged Orchid | Direct sun (at least 4-6 hours) | Rain-fed; moist spring, dry summer dormancy | Mildly toxic to pets |
| Greene's Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during active growth (autumn–spring); very little to none in summer | Pet-safe |
| Greenish Air Plant | Bright indirect light (just back from a sunny window) | 2–3 times per week (misting) or weekly soak | Pet-safe |
| Greig's Tulip | Direct sun (at least 4-6 hours) | Rainfall-dependent during growth; needs dry summer dormancy | Toxic to pets |
| Grey Speedwell | Direct sun (at least 4-6 hours) | Every 14–21 days during growing season; barely any in winter | Pet-safe |
| Grinning Argyroderma | Direct sun (at least 4-6 hours) | Every 3–4 weeks in autumn (main growing season); once or twice in spring; completely withheld mid-summer | Pet-safe |
| 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 |
| Groby's Specklinia | Medium indirect light (a couple of metres from a window) | Every 2–3 days; mounted plants every 1–2 days in warm conditions | Pet-safe |
| Gummy Uebelmannia | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, approximately every 10-14 days in summer; barely once a month in winter | Pet-safe |
| Gurken's Orthophytum | Direct sun (at least 4-6 hours) | Allow to dry between waterings — roughly every 7–10 days | Pet-safe |
| Gurken's Star Bromeliad | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Guzmania 'Rana' | Bright indirect light (just back from a sunny window) | Keep the central cup topped up; refresh it weekly and water the mix only when nearly dry | Pet-safe |
| Gymnocalycium andreae | Bright indirect light (just back from a sunny window) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Gymnocalycium denudatum | Bright indirect light (just back from a sunny window) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Gyoku-ryu Mondo Grass | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days in growth | Pet-safe |
| Gypsicola Butterwort | Bright indirect light (just back from a sunny window) | Keep damp via a shallow tray during summer growth; water sparingly once the succulent winter rosette forms | Mildly toxic to pets |
| Gypsum Butterwort | Bright indirect light (just back from a sunny window) | Tray-water sparingly in summer; near-dry in winter dormancy | Mildly toxic to pets |
| Hairy Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; once monthly or less in winter | Mildly toxic to pets |
| Hairy Alpine Primrose | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; minimal in summer and winter | Mildly toxic to pets |
| Hairy Bertolonia | Medium indirect light (a couple of metres from a window) | Every 4–6 days; keep evenly moist | Pet-safe |
| Hairy Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate continuously wet by sitting pot in a shallow tray of 1–2 cm of water at all times | Mildly toxic to pets |
| Hairy Gibbaeum | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in winter and spring (active season); dry in summer | Pet-safe |
| Hairy Houseleek | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; once a month or less in winter | Pet-safe |
| Hairy Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season; sparingly in winter | Pet-safe |
| Hairy Lip Fern | Bright indirect light (just back from a sunny window) | every 2-3 weeks (drought-tolerant once established) | Mildly toxic to pets |
| Hairy Primrose | Bright indirect light (just back from a sunny window) | Regularly during active growth (spring–autumn); sparingly in winter | Toxic to pets |
| Hairy Raphionacme | Bright indirect light (just back from a sunny window) | Weekly during active growth (spring–summer); virtually none in winter dormancy | Mildly toxic to pets |
| Hairy Rock Jasmine | Direct sun (at least 4-6 hours) | Sparingly; dry conditions preferred especially in winter | Pet-safe |
| Hairy Stonecrop | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; minimal in winter | Pet-safe |
| Hairy Sun Pitcher | Bright indirect light (just back from a sunny window) | Keep medium consistently moist; use a shallow tray with no more than 1 cm of water | Pet-safe |
| Hairy Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Mildly toxic to pets |
| Hairy Water Clover | Medium indirect light (a couple of metres from a window) | Permanently in waterlogged substrate or submerged | Mildly toxic to pets |
| Hairy Woodrush | Low light (north window or shaded room) | Every 7–10 days during the growing season | Pet-safe |
| Hairy-beard Gastrochilus | Bright indirect light (just back from a sunny window) | Mount: daily root misting; pot: every 3-4 days during growth, every 7-10 days in cooler months | Pet-safe |
| Hairy-fruited Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; very little in winter | Pet-safe |
| Hairy-leaf Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the active (cool) season; minimal or none in summer | Toxic to pets |
| Hairy-tongued Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; medium stays lightly moist | Pet-safe |
| Hall's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active growth (autumn to early spring); none in summer dormancy | Pet-safe |
| Hall's Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water in autumn (September–November) only; completely dry in winter and summer | Pet-safe |
| Hamilton's Sundew | Bright indirect light (just back from a sunny window) | Keep tray with 1–2 cm of water at all times | Pet-safe |
| Hand Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Hand-Bearing Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Happy Bean Peperomia | Bright indirect light (just back from a sunny window) | Every 1-2 weeks | Pet-safe |
| Happy Bean Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in spring/summer; every 4–6 weeks in winter | Pet-safe |
| Hard-leaf Primulina | Bright indirect light (just back from a sunny window) | Every 14–21 days in growing season; every 4 weeks in winter | Mildly toxic to pets |
| Hardy 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 |
| Harebell | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Pet-safe |
| Harris's Air Plant | Bright indirect light (just back from a sunny window) | Mist thoroughly 2–3 times per week or soak for 20–30 minutes once a week. | Mildly toxic to pets |
| Hatchet Cactus | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 14-21 days in summer; very sparingly in winter (once every 4-6 weeks) | Pet-safe |
| Haussknecht's Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season (spring–summer); every 4–6 weeks or rainfall-only in winter | Pet-safe |
| 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 |
| Haworthia | Bright indirect light (just back from a sunny window) | When the soil is dry, every 2-3 weeks | Pet-safe |
| Haworthia Bayeri | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Haworthia cooperi var. truncata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Pet-safe |
| Haworthia Emelyae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Herbacea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Lockwoodii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Magnifica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Mucronata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Obtusa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in growth | Pet-safe |
| Haworthia Pygmaea | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Haworthia Springbokvlakensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Tessellata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Turgida | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 7-12 days in summer, sparse in winter | Pet-safe |
| Haworthia Venosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthiopsis Viscosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haygarth's Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7-10 days in growth; every 3-4 weeks in winter | Pet-safe |
| Hayne's Matucana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 7-14 days in summer | Pet-safe |
| Heart Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top of the soil starts to dry | Mildly toxic to pets |
| Heart Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Heart-leaf Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days; mounted plants may need daily misting | Pet-safe |
| Heath-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Hedgehog Cactus | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in summer; keep dry in winter | Pet-safe |
| Hedgehog Fescue | Direct sun (at least 4-6 hours) | Every 14–21 days when established; very sparingly in winter | Pet-safe |
| Heliamphora minor | Bright indirect light (just back from a sunny window) | Keep permanently moist to wet; mist or top up pitchers regularly | Mildly toxic to pets |
| Heliamphora pulchella | Bright indirect light (just back from a sunny window) | Keep the mix wet to lightly standing; water frequently with rain/distilled/RO water | Mildly toxic to pets |
| Heliamphora tatei | Bright indirect light (just back from a sunny window) | Keep permanently moist to wet; do not let the medium dry | Mildly toxic to pets |
| Helmut's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active autumn-to-spring growth only; strictly none in summer | Pet-safe |
| Hemianthus callitrichoides 'Cuba' | Direct sun (at least 4-6 hours) | Permanently submerged; 30-50% water change weekly | Mildly toxic to pets |
| Hemianthus micranthemoides | Bright indirect light (just back from a sunny window) | Permanently submerged; 30-50% water change weekly | Mildly toxic to pets |
| Hemiboea subcapitata | 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 | Mildly toxic to pets |
| Hen-and-Chickens Sundew | Medium indirect light (a couple of metres from a window) | Continuously in a tray of 1–2 cm pure water; never allow to dry out. | Pet-safe |
| Heneken's Tolumnia | Bright indirect light (just back from a sunny window) | When the roots appear silvery-white and the fan base is dry, roughly every 4-7 days | Pet-safe |
| Herb Robert | Medium indirect light (a couple of metres from a window) | Low to moderate; water only during prolonged dry spells | Pet-safe |
| Hermit Primulina | Medium indirect light (a couple of metres from a window) | Allow the top half of the compost to dry between waterings | Mildly toxic to pets |
| Hernandez-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in autumn and winter | Pet-safe |
| Hernando Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of compost feel dry | Toxic to pets |
| Herradura Masdevallia | Medium indirect light (a couple of metres from a window) | 3–5 times per week | Pet-safe |
| Herre's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during autumn-to-spring active period; none in summer | Pet-safe |
| Heterodox Sun Pitcher | Bright indirect light (just back from a sunny window) | Keep substrate evenly moist at all times | Mildly toxic to pets |
| Heterodoxa Sun Pitcher | Bright indirect light (just back from a sunny window) | Water every 3-5 days, maintaining a consistently moist but not waterlogged substrate; keep pitchers partially filled with distilled or rainwater | Pet-safe |
| Heuchera 'Quicksilver' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Heuffel's Houseleek | Direct sun (at least 4-6 hours) | Low — allow to dry between waterings | Mildly toxic to pets |
| Heuffel's Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; rarely in winter | Pet-safe |
| 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 Cassiope | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water before the top 2 cm of growing medium dries out. | Mildly toxic to pets |
| Hirtz's Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting; never allow roots to fully dry | Pet-safe |
| Histrioides Iris | Direct sun (at least 4-6 hours) | Moderate in late winter and spring; dry in summer | Toxic to pets |
| Hoary Plantain | Direct sun (at least 4-6 hours) | Rarely; established plants are drought-tolerant | Pet-safe |
| Hollow-Rooted Fumewort | Medium indirect light (a couple of metres from a window) | Rainfall-dependent during spring growth; completely dry in summer dormancy | Toxic to pets |
| Holton's Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost feel dry | Toxic to pets |
| Hooded Maxillaria | Medium indirect light (a couple of metres from a window) | Every 5–7 days year-round; slight reduction in winter | Pet-safe |
| Hooded Pleurothallis | Medium indirect light (a couple of metres from a window) | Daily misting or watering; roots must remain evenly moist at all times | Pet-safe |
| Hook Sedge | Direct sun (at least 4-6 hours) | Keep evenly moist; water weekly in dry spells and don't let containers fully dry | Mildly toxic to pets |
| 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 |
| Horn-Bearing Coryphantha | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Horned Eriosyce | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once a month or less in winter | Pet-safe |
| Horned violet | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep evenly moist | Pet-safe |
| Horst's Discocactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; reduce to once a month or less in winter | Pet-safe |
| Horst's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Hosta '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 '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 |
| Houseleek Cliff Stonecrop | Direct sun (at least 4-6 hours) | Every 14–21 days in the growing season; very sparingly in winter | Pet-safe |
| Houseleek Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Pet-safe |
| Houseleek Saxifrage | Bright indirect light (just back from a sunny window) | Low — water sparingly at all times; near-dry in summer and winter | Pet-safe |
| Houttuynia cordata | Direct sun (at least 4-6 hours) | Keep soil constantly wet to waterlogged; never let it dry out | Mildly toxic to pets |
| Houttuynia cordata 'Chameleon' | Direct sun (at least 4-6 hours) | Keep soil constantly wet to waterlogged; never allow it to dry | Mildly toxic to pets |
| Huernia brevirostris | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| Huernia hystrix | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; nearly dry in winter | Mildly toxic to pets |
| Huernia keniensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Huernia macrocarpa | Bright indirect light (just back from a sunny window) | When the soil is dry, about every 1-2 weeks in warm growth | Mildly toxic to pets |
| Huernia pillansii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 12-16 days in summer; rarely in winter | Mildly toxic to pets |
| Huernia thuretii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Huernia zebrina | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| 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 |
| Humboldt's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 5-6 weeks in winter | Pet-safe |
| Humped Bladderwort | Direct sun (at least 4-6 hours) | Keep permanently submerged; top up to maintain a constant water level | Mildly 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 |
| Hydrocharis morsus-ranae | Direct sun (at least 4-6 hours) | Free-floating; keep on the surface of still or slow water | Mildly toxic to pets |
| Hygrophila lancea 'Araguaia' | Bright indirect light (just back from a sunny window) | Submerged permanently; 25-50% aquarium water changes weekly | Mildly toxic to pets |
| Hygrophila pinnatifida | Medium indirect light (a couple of metres from a window) | Continuously submerged; 30-50% aquarium water change weekly | Mildly toxic to pets |
| Hypoestes phyllostachya 'Confetti Pink' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Splash Select White' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Iara's Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; almost none during dormancy | Mildly toxic to pets |
| Ibarra's Butterwort | Bright indirect light (just back from a sunny window) | Keep substrate moist; water every 3–5 days during active growth, reduce to occasional misting when plant is in succulent-rosette phase | Mildly toxic to pets |
| Imbricate Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days; do not allow compost to dry out | Pet-safe |
| Immersed Stelis | Medium indirect light (a couple of metres from a window) | Daily misting for mounted specimens; every 2 days for potted plants | Pet-safe |
| Impatiens | Medium indirect light (a couple of metres from a window) | Twice-weekly watering | Pet-safe |
| Impatiens walleriana 'Xtreme Salmon' | Low light (north window or shaded room) | When the top 1-2 cm of soil begins to dry, often every 1-3 days in summer | Pet-safe |
| Indian Head Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days in spring and summer; every 3-4 weeks in autumn; minimal in winter | Pet-safe |
| Indian Head Notocactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in the active growing season; reduce to once every 5-8 weeks in winter | Pet-safe |
| Indian Sinocrassula | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; monthly or less in winter | Mildly toxic to pets |
| Inner-grooved Specklinia | Medium indirect light (a couple of metres from a window) | Daily or every other day; keep consistently moist | Pet-safe |
| Inner-rough Pleurothallis | Medium indirect light (a couple of metres from a window) | When the medium surface is just drying, roughly every 4-6 days | Pet-safe |
| Intense Blue Fescue | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; minimal once established | Mildly toxic to pets |
| Ionopsis utricularioides | Bright indirect light (just back from a sunny window) | Water frequently as roots near dryness, often daily on a mount in warm weather | Mildly 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 reticulata 'Harmony' | Direct sun (at least 4-6 hours) | Water during autumn-to-spring growth; keep dry in summer dormancy | Toxic to pets |
| Iron Butterfly Foamflower | Medium indirect light (a couple of metres from a window) | Once or twice per week during the growing season; water sparingly in winter. | Mildly toxic to pets |
| Island Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in active season (October–April); none to minimal in summer | Pet-safe |
| Ivory Primulina | Medium indirect light (a couple of metres from a window) | Allow the top half of compost to dry before rewatering | Mildly toxic to pets |
| Ivy-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn/winter | Pet-safe |
| Ivy-Leaved Cyclamen | Medium indirect light (a couple of metres from a window) | Drought-tolerant once established; rely entirely on natural rainfall | Toxic to pets |
| Janke's Gesneriad | Medium indirect light (a couple of metres from a window) | Water at the root zone only when the soil approaches dryness, roughly every 10–14 days in the growing season | Mildly toxic to pets |
| Japanese Dunce Cap | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; reduce significantly in winter dormancy | Pet-safe |
| Japanese Mazus | Direct sun (at least 4-6 hours) | Every 3–5 days; prefers moist, consistently watered soil | Mildly toxic to pets |
| Japanese Peperomia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; reduce in winter | Pet-safe |
| Japanese Rush | Bright indirect light (just back from a sunny window) | Permanently submerged aquatic plant | Pet-safe |
| Japanese Stiff Shield Fern | Medium indirect light (a couple of metres from a window) | Weekly in the first year, then only during prolonged dry spells | Pet-safe |
| Japanese Sweet Flag | Bright indirect light (just back from a sunny window) | Keep soil consistently moist or wet; do not allow to dry out | Mildly toxic to pets |
| Japanese Wood Poppy | Medium indirect light (a couple of metres from a window) | Regular; keep soil evenly moist during the growing season | Mildly toxic to pets |
| Jelly Peperomia | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, typically every 7-12 days | Pet-safe |
| Jewel Orchid | Bright indirect light (just back from a sunny window) | Every 7-10 days; keep the mix evenly moist, never bone dry | Pet-safe |
| Johannes Cape Primrose | Medium indirect light (a couple of metres from a window) | Every 5-8 days in active growth; every 2-3 weeks in winter | Pet-safe |
| Johnny Jump Up | Bright indirect light (just back from a sunny window) | When the top 1–2 cm of soil is dry, roughly every 5–7 days | Mildly toxic to pets |
| Johnson's Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days in summer; every 3–4 days in cooler months | Pet-safe |
| Jointed Pectinaria | Direct sun (at least 4-6 hours) | Every 3–4 weeks during the growing season; almost dry in summer and winter | Mildly 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 Lepanthes | Medium indirect light (a couple of metres from a window) | Every 7–10 days (potted); near-daily misting if mounted | Pet-safe |
| Juniper-leaved Thrift | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; very sparingly in winter | Pet-safe |
| Juno Iris | Direct sun (at least 4-6 hours) | Moderate from early spring to late spring; completely dry mid-summer to mid-autumn | Toxic to pets |
| Kacip Fatimah | Low light (north window or shaded room) | Water when the top 1–2 cm of soil begins to dry; typically every 4–6 days in warm conditions | Mildly toxic to pets |
| Kalanchoe | Direct sun (at least 4-6 hours) | When the soil is dry, every 10-14 days | Toxic to pets |
| Kalanchoe '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 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 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 |
| Karas Mountains Living Stones | Direct sun (at least 4-6 hours) | Only during the active growth window: water sparingly when new leaves are developing (roughly autumn to late spring). Withhold water entirely in summer dormancy. | Pet-safe |
| Kelsey's Phlox | Direct sun (at least 4-6 hours) | Low to moderate — allow soil to dry between waterings | Mildly toxic to pets |
| Kenneally's Sundew | Bright indirect light (just back from a sunny window) | Standing tray (growing season); minimal (dry rest) | Pet-safe |
| Kidney Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days during active growth; every 6–8 days in winter | Pet-safe |
| Killarney Fern | Low light (north window or shaded room) | Continuously moist — maintain permanent moisture in the sphagnum substrate and high atmospheric humidity at all times | Mildly toxic to pets |
| Kim cape primrose | Bright indirect light (just back from a sunny window) | Every 7–10 days during spring and summer; every 14–21 days in winter | Pet-safe |
| King Ferdinand's Saxifrage | Bright indirect light (just back from a sunny window) | Low — water moderately in active growth; reduce sharply in summer dormancy and winter | Pet-safe |
| King Henry Venus flytrap | Direct sun (at least 4-6 hours) | Continuously moist via tray method; barely damp in winter | Pet-safe |
| King of Hearts 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 |
| Kirchhoff's Air Plant | Medium indirect light (a couple of metres from a window) | Mist 3–4 times per week or soak for 20–30 minutes twice a week. | Mildly toxic to pets |
| Kirk's Huernia | Bright indirect light (just back from a sunny window) | Every 14–21 days when growing (spring–autumn); once monthly or less in winter | Pet-safe |
| Kitten Tails | Medium indirect light (a couple of metres from a window) | Infrequently; dry to medium-dry | Mildly toxic to pets |
| Knotted Clover | Direct sun (at least 4-6 hours) | Low; drought-tolerant | Pet-safe |
| Labrador violet | Medium indirect light (a couple of metres from a window) | Every 5–7 days; keep consistently moist | Pet-safe |
| Lace Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; dry rest in winter | Mildly toxic to pets |
| Lace Fern | Bright indirect light (just back from a sunny window) | When the soil is completely dry, approximately every 10-21 days depending on temperature and season | Pet-safe |
| Lady of the Night | Bright indirect light (just back from a sunny window) | When fully dry, roughly every 7-10 days | Pet-safe |
| Lady of the Night | Bright indirect light (just back from a sunny window) | Allow roots and medium to dry almost completely between waterings, roughly every 5-7 days in active growth and every 10-14 days in winter rest | Pet-safe |
| Lady Slipper Orchid | Bright indirect light (just back from a sunny window) | Every 5-10 days; keep the medium evenly moist | Mildly toxic to pets |
| Lady Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| Ladybird Scarlet cosmos | Direct sun (at least 4-6 hours) | Weekly; allow soil surface to dry between waterings | Pet-safe |
| Laguna Beach Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days from autumn through spring; withhold almost entirely in summer | Pet-safe |
| Lamb's Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; once monthly or less in winter | Mildly toxic to pets |
| Lance-leaf Stelis | Medium indirect light (a couple of metres from a window) | Every 2–3 days; never allow the medium to dry completely | Pet-safe |
| Lance-leaved Sundew | Bright indirect light (just back from a sunny window) | Keep permanently wet via the tray method (1-2 inches of standing water); never let the media dry out | Mildly toxic to pets |
| Lance-leaved Sundew | Medium indirect light (a couple of metres from a window) | Keep tray topped up year-round | Pet-safe |
| Lance-Leaved Trillium | Medium indirect light (a couple of metres from a window) | Moist in spring; more drought-tolerant than most Trilliums once dormant | Mildly toxic to pets |
| Lanceolate Anubias | Low light (north window or shaded room) | Permanently submerged or emersed aquatic plant | Toxic to pets |
| Lansberg's Restrepia | Bright indirect light (just back from a sunny window) | Every 2-4 days; evenly moist but not waterlogged | Pet-safe |
| Lapidaria margaretae | Direct sun (at least 4-6 hours) | Soak only in autumn and early spring growth; keep bone-dry through summer and deep winter | Mildly toxic to pets |
| Larch-leaved Sandwort | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; minimal in winter | Pet-safe |
| Larch-Leaved Stitchwort | Direct sun (at least 4-6 hours) | Very low — drought-tolerant; water sparingly | Mildly toxic to pets |
| Large-cloaked Stelis | Medium indirect light (a couple of metres from a window) | Every 1–2 days, never allowing the medium to dry completely | Pet-safe |
| Large-flower Bulbophyllum | Bright indirect light (just back from a sunny window) | Water when the top of the medium begins to dry, approximately every 3-5 days | Pet-safe |
| large-flowered butterwort | Bright indirect light (just back from a sunny window) | Keep soil permanently damp during growing season; reduce but do not dry out completely in winter | Pet-safe |
| Large-Flowered Copiapoa | Direct sun (at least 4-6 hours) | Every 14-21 days in summer; once a month or dry in winter | Pet-safe |
| Large-Flowered Houseleek | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in prolonged dry periods | Pet-safe |
| Large-Flowered Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; sparingly in winter | Pet-safe |
| 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-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; much less in winter | Pet-safe |
| Large-Leaf Primulina | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of potting mix is dry, roughly every 7-10 days | Pet-safe |
| Large-Leaved Butterwort | Bright indirect light (just back from a sunny window) | Keep substrate damp in summer; reduce sharply in winter | Mildly toxic to pets |
| Large-Spike Peperomia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks (allow top half to two-thirds of soil to dry) | Pet-safe |
| large-stalked sinningia | Bright indirect light (just back from a sunny window) | Every 7–14 days in active growth; withhold through dormancy | Pet-safe |
| Larryleachia marlothii | Bright indirect light (just back from a sunny window) | Sparingly; only when fully dry, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| Late Tulip | Direct sun (at least 4-6 hours) | Rainfall-dependent during spring growth; needs dry summer rest | Toxic to pets |
| Lau's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 5-6 weeks in winter | Pet-safe |
| Lau's Turbinicarpus | Direct sun (at least 4-6 hours) | When soil is completely dry, approximately every 14-21 days in summer; minimal or no water in winter | Pet-safe |
| Lawn Pennywort | Bright indirect light (just back from a sunny window) | Fully submerged aquatic or marginal; keep substrate or water consistently moist | Pet-safe |
| Leaf-Spined Brain Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-14 days during summer; once every 4-6 weeks in winter | Pet-safe |
| Leafy Orthophytum | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Least Primrose | Direct sun (at least 4-6 hours) | Every 7–10 days during active growth; very sparingly in summer and winter | Mildly toxic to pets |
| Lebanese Rosularia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in winter | Pet-safe |
| Lehmann's Iceplant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during spring and summer; monthly or less in winter | Pet-safe |
| Lemboglossum rossii | Bright indirect light (just back from a sunny window) | Water when the bark approaches dryness, roughly every 4-7 days, keeping pseudobulbs plump | Pet-safe |
| Lemmaphyllum microphyllum | Bright indirect light (just back from a sunny window) | When the mount or mix is nearly dry, roughly every 4-7 days | Mildly toxic to pets |
| Lemon Button Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 5-7 days | Pet-safe |
| Lemon-scented Aerangis | Medium indirect light (a couple of metres from a window) | Water when roots begin to appear silvery-grey (indicating dryness), roughly every 5-8 days in summer and every 10-14 days in cooler months | Pet-safe |
| Leopoldina Earth Star | Bright indirect light (just back from a sunny window) | Water when top 2 cm of soil dries, roughly every 7-10 days | Pet-safe |
| Lepanthes telipogoniflora | Medium indirect light (a couple of metres from a window) | Keep roots constantly moist but never sodden, misting or watering daily | Mildly toxic to pets |
| Lesser Begonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth, every 10–14 days in winter | Toxic to pets |
| lesser bladderwort | Bright indirect light (just back from a sunny window) | Permanently submerged or floating in shallow standing water | Pet-safe |
| Lesser Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in active growth; reduce significantly in winter | Pet-safe |
| Lesser Sea Spurrey | Direct sun (at least 4-6 hours) | Low; tolerates periods of drought punctuated by brackish flooding | Mildly toxic to pets |
| Lesser Silver Saxifrage | Direct sun (at least 4-6 hours) | Low — water only when the top layer of grit is dry | Pet-safe |
| 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 |
| Lesser Water Plantain | Direct sun (at least 4-6 hours) | Saturated to 10 cm depth of water | Pet-safe |
| Levy's Huernia | Bright indirect light (just back from a sunny window) | Every 14–21 days during active growth (spring–autumn); once monthly or less in winter | Pet-safe |
| Lichang Chirita | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Licorice Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist while in active growth (fall through spring); water when the surface just begins to dry | Pet-safe |
| Lifelong Saxifrage | Bright indirect light (just back from a sunny window) | Water moderately; allow the top 2–3 cm of soil to dry before watering. | Pet-safe |
| Lightning jewel orchid | Bright indirect light (just back from a sunny window) | Keep lightly and evenly moist — never bone dry, never soggy | Mildly toxic to pets |
| Lilafee Epimedium | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Mildly toxic to pets |
| Liliana's Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Lily of the valley | Low light (north window or shaded room) | Weekly watering | Toxic to pets |
| Lilyturf-like Primulina | Medium indirect light (a couple of metres from a window) | Every 10–14 days in active growth; every 3–4 weeks in winter | Mildly toxic to pets |
| Limnophila aromatica | Bright indirect light (just back from a sunny window) | Submerged form kept fully underwater; emersed form kept in waterlogged soil or shallow standing water | Mildly toxic to pets |
| Linaria maroccana 'Fairy Bouquet' | Direct sun (at least 4-6 hours) | When the top 2 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| Linden-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow soil to partially dry) | Pet-safe |
| Linden's Canistrum | Bright indirect light (just back from a sunny window) | Keep the central tank filled with fresh water; water the root zone when the top 2-3 cm is dry, roughly every 7-10 days | Pet-safe |
| Lion's Angraecum | Bright indirect light (just back from a sunny window) | Every 2–4 days in summer, every 7–10 days in winter | Pet-safe |
| Lion's Angraecum | Bright indirect light (just back from a sunny window) | When roots are silvery and the medium approaches dryness, roughly every 7-10 days in summer | Pet-safe |
| Lipstick Echeveria | Direct sun (at least 4-6 hours) | Every 1-2 weeks in spring/summer; sparingly in winter | Pet-safe |
| Lithops | Direct sun (at least 4-6 hours) | Follow the seasonal cycle, not a schedule | Pet-safe |
| Lithops Aucampiae | Direct sun (at least 4-6 hours) | Strictly seasonal: water in spring and autumn only, never in summer dormancy or mid-winter | Pet-safe |
| Lithops Bromfieldii | Direct sun (at least 4-6 hours) | Seasonally, only every few weeks during active growth and not at all during leaf renewal | Pet-safe |
| Lithops Divergens | Direct sun (at least 4-6 hours) | Only in autumn and spring growth, sparingly when soil is bone dry; no water during summer or mid-winter rest | Pet-safe |
| Lithops Hookeri | Direct sun (at least 4-6 hours) | Strictly seasonal: water in spring and autumn only, never during summer dormancy or mid-winter | Pet-safe |
| Lithops Julii | Bright indirect light (just back from a sunny window) | During spring and autumn growth only, roughly every 2-3 weeks; none in summer or winter | Pet-safe |
| Lithops Lesliei | Direct sun (at least 4-6 hours) | Strictly seasonal: water in spring and autumn only, never during summer dormancy or mid-winter | Pet-safe |
| Lithops Optica 'Rubra' | Bright indirect light (just back from a sunny window) | Sparingly in spring and autumn, every 2-3 weeks; withhold entirely in summer and winter | Pet-safe |
| Lithops Pseudotruncatella | Direct sun (at least 4-6 hours) | Very infrequently, following the seasonal cycle rather than a fixed schedule | Pet-safe |
| Lithops Salicola | Bright indirect light (just back from a sunny window) | Only during active growth (autumn and spring), roughly every 2-3 weeks; none in summer or deep winter | Pet-safe |
| Little Calyx Aechmea | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season | Pet-safe |
| Little Leather Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep roots evenly moist | Pet-safe |
| Little One Temple Bells | Bright indirect light (just back from a sunny window) | Every 5–7 days while growing; withhold completely during dormancy | Pet-safe |
| Living Rock Cactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 21-30 days in summer; essentially none in winter | Pet-safe |
| Living Stones | Direct sun (at least 4-6 hours) | Very infrequently and strictly by season, often only every few weeks and not at all in summer or deep winter | Pet-safe |
| Lobb's Bulbophyllum | Medium indirect light (a couple of metres from a window) | Keep evenly moist in growth; water every 3-5 days | Pet-safe |
| Lobb's Bulbophyllum | Bright indirect light (just back from a sunny window) | When the top of the medium or slab begins to dry, approximately every 4-7 days; reduce slightly in winter | Pet-safe |
| Lobivia famatimensis | Direct sun (at least 4-6 hours) | Water thoroughly when the mix dries out, roughly every 1-2 weeks in summer; keep dry through winter | Pet-safe |
| Long Eye-leaf | Direct sun (at least 4-6 hours) | Every 14-21 days during the autumn-to-spring growing season when the old body wrinkles; completely dry from late spring through summer | Mildly toxic to pets |
| Long-flower Cirrhopetalum | Medium indirect light (a couple of metres from a window) | Every 6-8 days during growth; every 10-14 days in cooler or slower growth periods | Pet-safe |
| Long-Flowered Boesenbergia | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry during the growing season, approximately every 7-10 days; minimal water in dormancy | Mildly toxic to pets |
| Long-Flowered Bulbophyllum | Bright indirect light (just back from a sunny window) | Every 3–5 days in active growth (late spring to autumn); reduced in autumn and winter | Pet-safe |
| Long-Leaved Pachyphytum | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; every 4–6 weeks in autumn and winter | Pet-safe |
| Long-leaved 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-Petalled Lewisia | Bright indirect light (just back from a sunny window) | Moderate in spring; almost dry in summer dormancy | Mildly toxic to pets |
| Long-Spurred Violet | Medium indirect light (a couple of metres from a window) | Regular; keep soil evenly moist | Pet-safe |
| Long-Stalked Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate constantly wet; place pot in 1–3 cm of water in a saucer year-round | Mildly toxic to pets |
| Long-stalked Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; reduce slightly during rest period | Mildly toxic to pets |
| Long-stalked Spiderwort | Medium indirect light (a couple of metres from a window) | Weekly during active growth; reduce after summer die-back | Mildly toxic to pets |
| Long-tailed Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in warm months; every 1-2 days in cool months — medium must not dry out between waterings | Pet-safe |
| Long-tongue Tongue Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer; monthly or less in winter | Mildly toxic to pets |
| Longleaf Phlox | Direct sun (at least 4-6 hours) | Every 14–21 days when establishing; minimal supplemental water once established | Pet-safe |
| Loose Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in winter | Mildly toxic to pets |
| Loose-flowered Monanthes | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in spring and summer; every 4–6 weeks or less in winter | Mildly toxic to pets |
| 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 |
| Loranthus-leaf Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 2-3 days; keep evenly moist | Pet-safe |
| Low Shield Plant | Low light (north window or shaded room) | Every 10–14 days; less in winter | Toxic to pets |
| Ludisia discolor 'Alba' | Low light (north window or shaded room) | When the top 1-2 cm of mix is just drying, roughly every 5-7 days | Pet-safe |
| Ludwigia arcuata | Bright indirect light (just back from a sunny window) | Grown submersed; perform a 30-50% aquarium water change weekly | Mildly toxic to pets |
| Ludwigia brevipes | Bright indirect light (just back from a sunny window) | Grown submersed; do a 30-50% aquarium water change weekly | Mildly toxic to pets |
| 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 |
| Lund's Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Lungling Primulina | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; reduce to every 3–4 weeks in winter | Mildly toxic to pets |
| Lydia's Eye-leaf | Direct sun (at least 4-6 hours) | Every 14-21 days in autumn through spring when the body wrinkles; none at all from late spring through summer | Mildly toxic to pets |
| Lydia's Window Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (September–March in the Northern Hemisphere); essentially none in summer | Mildly toxic to pets |
| Lydian Stonecrop | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Pet-safe |
| Madagascar Sundew | Direct sun (at least 4-6 hours) | Continuously — maintain 1–3 cm of water in a tray year-round during active growth; reduce tray depth in winter. | Pet-safe |
| Madison's Matucana | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, every 10-14 days in summer | Pet-safe |
| Magdalene Angraecum | Bright indirect light (just back from a sunny window) | Regular watering spring–autumn; reduce markedly in winter | Pet-safe |
| Maidenhair Spleenwort | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Maikai Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow medium to dry out between waterings | Pet-safe |
| Majestic Giants Pansy | 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 in mild weather | Mildly toxic to pets |
| Mammillaria bombycina | Direct sun (at least 4-6 hours) | Water thoroughly when the soil is fully dry, roughly every 1-2 weeks in summer; keep nearly dry in winter | Pet-safe |
| Mammillaria mystax | Direct sun (at least 4-6 hours) | Water deeply when the mix is completely dry, about every 1-2 weeks in summer; keep dry in winter | Pet-safe |
| Many Fingers | Direct sun (at least 4-6 hours) | Every 2 weeks in spring and summer; every 4–6 weeks in autumn and winter | Pet-safe |
| Many-Flowered Air Plant | Bright indirect light (just back from a sunny window) | Mist 1–2 times per week, or a 20-minute soak every 1–2 weeks | Pet-safe |
| many-flowered cape primrose | Medium indirect light (a couple of metres from a window) | Every 10–14 days; allow soil to dry between waterings | Pet-safe |
| Many-flowered Masdevallia | Bright indirect light (just back from a sunny window) | Daily in warm weather; every 3–5 days in cooler months | Pet-safe |
| Many-Flowered Racinaea | Bright indirect light (just back from a sunny window) | Mist thoroughly 2-3 times per week; allow to dry slightly between mistings | Pet-safe |
| Many-haired Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; almost dry in winter | Pet-safe |
| Many-Leaved Monanthes | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in the growing season; reduced in summer heat | Pet-safe |
| Many-Nippled Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Many-Stemmed Air Plant | Bright indirect light (just back from a sunny window) | Soak for 30 minutes 2–3 times per week, or mist daily | Pet-safe |
| Many-stemmed Liveforever | Direct sun (at least 4-6 hours) | Every 2–3 weeks autumn through late spring; none in summer | Pet-safe |
| Maranta 'Kim' | 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 | Pet-safe |
| Maranta 'Marisela' | 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 | Pet-safe |
| Maranta 'Massangeana' | 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 | Pet-safe |
| Maranta 'Silver Band' | 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 | Pet-safe |
| Marble Earth Star | Medium indirect light (a couple of metres from a window) | Every 7–10 days | Pet-safe |
| Marble Houseleek | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; once a month or less in winter | Pet-safe |
| Marbled Earth Star | Medium indirect light (a couple of metres from a window) | Water when top 2-3 cm of soil dries, roughly every 7-10 days | Pet-safe |
| Marbled Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during the autumn-to-spring active period; completely dry in summer | Pet-safe |
| Marbled Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water only in autumn during new-leaf emergence (September–November); completely dry rest of year | Pet-safe |
| Margaret's Corkscrew Plant | Bright indirect light (just back from a sunny window) | Keep medium permanently moist to wet; tray method with 1 cm water during growing season | Pet-safe |
| Margined Copiapoa | Direct sun (at least 4-6 hours) | When the soil is completely dry throughout, roughly every 14-21 days in summer; monthly or less in winter | Pet-safe |
| Margined Saxifrage | Bright indirect light (just back from a sunny window) | Every 7–10 days when growing; very sparingly in winter | Pet-safe |
| Marsilea quadrifolia | Bright indirect light (just back from a sunny window) | Keep in wet mud or shallow water; never let it dry out | Mildly toxic to pets |
| Marson's Crown Cactus | Direct sun (at least 4-6 hours) | Every 7-14 days in active growth; once every 4-6 weeks in winter | Pet-safe |
| Marson's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days in summer; monthly or less in winter | Pet-safe |
| Martinezii Lily | Direct sun (at least 4-6 hours) | Dry in summer; moderate in winter-to-spring growth period | Toxic to pets |
| Martius's Brassavola | Bright indirect light (just back from a sunny window) | Every 5–7 days during growing season; reduce in winter after flowering | Pet-safe |
| Martius's Stanhopea | Bright indirect light (just back from a sunny window) | 3–5 times per week in summer; sharply reduce in winter | Pet-safe |
| Mary's Prosthechea | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; every 14-21 days in winter | Pet-safe |
| Masdevallia Angel Frost | Medium indirect light (a couple of metres from a window) | Keep evenly moist year-round, watering about every 2-4 days so the medium never dries out | Pet-safe |
| Masdevallia coccinea | Medium indirect light (a couple of metres from a window) | Keep evenly moist all year, watering about every 2-4 days so the medium never dries fully | Pet-safe |
| Masdevallia tovarensis | Medium indirect light (a couple of metres from a window) | Keep evenly moist throughout the year, watering roughly every 2-4 days so the medium stays damp | Pet-safe |
| Masdevallia veitchiana | Medium indirect light (a couple of metres from a window) | Keep roots evenly moist year-round; water roughly every 2-4 days so the mix never fully dries | Pet-safe |
| Masdevallia wageneriana | Medium indirect light (a couple of metres from a window) | Keep continuously moist; water or mist every 1-3 days as the tiny mass dries quickly | Pet-safe |
| Mathilde's Rock Jasmine | Direct sun (at least 4-6 hours) | Sparingly; allow to nearly dry between waterings | Mildly toxic to pets |
| Matted Globularia | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter — avoid wetting the crown. | Mildly toxic to pets |
| Matted Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks; very sparingly in winter | Pet-safe |
| Maudiae Slipper Orchid | Low light (north window or shaded room) | Every 5–7 days | Pet-safe |
| Maudiae Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the top of the mix begins to dry, roughly every 5-7 days | Pet-safe |
| Maudiae-Type Slipper 'Black Jack' | Medium indirect light (a couple of metres from a window) | When the top of the mix is just starting to dry, roughly every 5-7 days | Mildly toxic to pets |
| Maughan's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–4 weeks in autumn growth phase; none during summer dormancy | Pet-safe |
| Maughan's Cone Plant | Direct sun (at least 4-6 hours) | Every 3–4 weeks during the autumn–winter–spring growing period; none from June to late August | Pet-safe |
| Maury's Air Plant | Direct sun (at least 4-6 hours) | Mist or soak every 10–14 days | Pet-safe |
| Maxillaria schunkeana | Medium indirect light (a couple of metres from a window) | Water when the surface of the medium approaches dryness, about every 4-6 days, keeping it lightly moist | Mildly toxic to pets |
| Maxillaria variabilis | Bright indirect light (just back from a sunny window) | When the medium nears dryness, about every 4-6 days in growth | Pet-safe |
| Maze-Leaf Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil feels dry | Toxic to pets |
| McDowell's Thelocactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 14-21 days in summer; once a month or less in winter. | Pet-safe |
| Meadow Saxifrage | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring; minimal watering needed from midsummer onward | Pet-safe |
| Medusa Orchid | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water every 2-4 days, more in heat | Pet-safe |
| Medusa's Cirrhopetalum | Medium indirect light (a couple of metres from a window) | Every 5-7 days during active growth; reduce to every 10-14 days in cooler months | Pet-safe |
| 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 |
| Mejia's Masdevallia | Medium indirect light (a couple of metres from a window) | Water when the medium is approaching dryness, roughly every 1-2 days in active growth | Pet-safe |
| Melocactus bahiensis | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 1-2 weeks in warm summer growth; sparingly in winter | Mildly toxic to pets |
| Melocactus peruvianus | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 1-2 weeks in warm summer growth; minimal in winter | Mildly toxic to pets |
| Membrane-flowered Stelis | Medium indirect light (a couple of metres from a window) | Every 1–2 days; never allow roots to fully dry | Pet-safe |
| Mendoza Graptopetalum | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 10-14 days in summer | Pet-safe |
| Metallic Blue Fern | Low light (north window or shaded room) | Keep the rhizome and medium lightly moist; water every 4-6 days, allowing the surface to barely dry | Pet-safe |
| Mexican Achimenes | Bright indirect light (just back from a sunny window) | Consistently moist throughout the growing season (spring–autumn); dry in winter dormancy | Pet-safe |
| Mexican Butterwort | Bright indirect light (just back from a sunny window) | Keep moist spring-summer; ease off in winter | Mildly toxic to pets |
| Mexican Butterwort | Bright indirect light (just back from a sunny window) | Tray-water during growth; keep barely damp in winter | Mildly toxic to pets |
| Mexican Butterwort | Bright indirect light (just back from a sunny window) | Tray-water in summer; near-dry in winter | Mildly toxic to pets |
| Mexican Pincushion | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer and once a month or less in winter | Pet-safe |
| Mexican Snowball | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly in winter | Pet-safe |
| Meyer's Cape Primrose | Bright indirect light (just back from a sunny window) | Every 10-14 days in growth; every 4-6 weeks in winter | Pet-safe |
| Meyer's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer (August/September) through autumn; withheld completely from May to August | Pet-safe |
| 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 |
| Micranthemum tweediei 'Monte Carlo' | Bright indirect light (just back from a sunny window) | Permanently submerged; 30-50% water change weekly | Mildly toxic to pets |
| Micro Earth Star | Medium indirect light (a couple of metres from a window) | Water when top 1-2 cm of soil dries, roughly every 5-8 days | Pet-safe |
| Microsorum pteropus | Low light (north window or shaded room) | Submerged aquatic; keep continuously underwater with a 25-30% water change weekly | Mildly toxic to pets |
| Microsorum pteropus 'Narrow' | Low light (north window or shaded room) | Continuously submerged; 20-30% aquarium water change weekly | Mildly toxic to pets |
| Microsorum pteropus 'Needle Leaf' | Low light (north window or shaded room) | Continuously submerged; 20-30% aquarium water change weekly | Mildly toxic to pets |
| Microsorum pteropus 'Trident' | Low light (north window or shaded room) | Continuously submerged; 20-30% aquarium water change weekly | Mildly toxic to pets |
| Microsorum pteropus 'Windelov' | Low light (north window or shaded room) | Submerged aquatic; keep continuously underwater with a 25-30% water change weekly | Mildly toxic to pets |
| Miller's Laelia | Direct sun (at least 4-6 hours) | Every 3–5 days in summer; very sparse in winter (monthly or less) | Pet-safe |
| Miller's Laelia | Bright indirect light (just back from a sunny window) | When the pot is almost completely dry, roughly every 7-14 days in summer | Pet-safe |
| Miltonia Orchid | Bright indirect light (just back from a sunny window) | Every 2-5 days in active growth; let medium approach dryness, never bone-dry | Pet-safe |
| Miltoniopsis 'Augres' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; usually every 4-6 days | Pet-safe |
| Miltoniopsis 'Herralexandre' | Medium indirect light (a couple of metres from a window) | When the mix surface starts to dry, roughly every 4-6 days | Pet-safe |
| Miltoniopsis 'Red Tide' | Medium indirect light (a couple of metres from a window) | Keep the mix evenly moist; typically every 4-6 days | Pet-safe |
| Miltoniopsis phalaenopsis | Medium indirect light (a couple of metres from a window) | Every 3-5 days, keeping the mix lightly moist at all times | Pet-safe |
| Miltoniopsis roezlii | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water every 3-5 days, never letting the mix fully dry | Pet-safe |
| Mini Moth Orchid 'Sogo Vivien' | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days, when the bark mix is nearly dry and roots turn silvery-grey | Pet-safe |
| Miniature African violet | Bright indirect light (just back from a sunny window) | Every 5–8 days | Pet-safe |
| Miniature Cone Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days during active growth (autumn–spring); completely dry through summer dormancy | Pet-safe |
| Miniature Cone Plant | Direct sun (at least 4-6 hours) | Strictly seasonal: water very sparingly from September to early April; completely dry from April through August | Mildly toxic to pets |
| Miniature Creeping Jenny | Medium indirect light (a couple of metres from a window) | Frequently; keep soil consistently moist | Mildly toxic to pets |
| Miniature Desert Rose | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Pet-safe |
| Miniature Sinningia | Bright indirect light (just back from a sunny window) | Keep evenly, lightly moist at all times; check every few days | Pet-safe |
| Minnesota Trout Lily | Medium indirect light (a couple of metres from a window) | Moist throughout active growth (April–May); bone-dry conditions are fatal | Mildly toxic to pets |
| Minor Sun Pitcher | Bright indirect light (just back from a sunny window) | Water every 3-5 days to keep the substrate consistently moist; maintain partial pitcher fill with distilled water | Pet-safe |
| Minute Masdevallia | Medium indirect light (a couple of metres from a window) | Every 2–3 days; keep medium consistently moist | Pet-safe |
| Miquel's Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Missouri Foxtail Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-21 days in summer; virtually none in winter | Pet-safe |
| Mitla Air Plant | Direct sun (at least 4-6 hours) | Water 1–3 times per week depending on season | Pet-safe |
| Moctezuma Butterwort | Bright indirect light (just back from a sunny window) | Tray-water in summer; near-dry in winter | Mildly toxic to pets |
| Modest Cape Primrose | Medium indirect light (a couple of metres from a window) | Every 7-10 days in growth; every 3-4 weeks in winter | Pet-safe |
| Mondo Grass | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Monkey flower | Medium indirect light (a couple of metres from a window) | Every 2–3 days; more frequently in warm or windy weather | Pet-safe |
| Monosolenium tenerum | Medium indirect light (a couple of metres from a window) | Permanently submerged; 25-40% water change weekly | Mildly toxic to pets |
| Monster Scaphosepalum | Medium indirect light (a couple of metres from a window) | When the top of the medium just begins to dry, roughly every 3-5 days | Pet-safe |
| Mont Cenis Bellflower | Direct sun (at least 4-6 hours) | Very low — water sparingly during growth; keep dry in winter | Mildly toxic to pets |
| Moon Cactus | Bright indirect light (just back from a sunny window) | Only when the mix is fully dry, roughly every 10-14 days in summer and far less in winter | Pet-safe |
| Moon Cactus | Bright indirect light (just back from a sunny window) | Every 14–21 days in spring/summer; every 4–6 weeks in autumn; almost none in winter | Pet-safe |
| Moon Valley Pilea | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Moons Chirita | Bright indirect light (just back from a sunny window) | Every 7–10 days | Pet-safe |
| Morelia Miltonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of the mix feels barely moist, roughly every 6-8 days in summer | Pet-safe |
| Moretti's Bellflower | Bright indirect light (just back from a sunny window) | Low to moderate — water carefully during growth, keep dry in winter | Mildly toxic to pets |
| Moroccan toadflax | Direct sun (at least 4-6 hours) | Once or twice a week; reduce to weekly once established | Mildly toxic to pets |
| Morren's Catopsis | Medium indirect light (a couple of metres from a window) | Keep the central tank topped up; flush weekly; water soil lightly every 10-14 days | Pet-safe |
| Moser's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in summer; every 4-6 weeks in winter | Pet-safe |
| Moss-dwelling Specklinia | Medium indirect light (a couple of metres from a window) | Daily misting if mounted; every 1–2 days if potted | Pet-safe |
| Mossy cassiope | Bright indirect light (just back from a sunny window) | Consistently moist; never allow soil to dry out | Pet-safe |
| Mossy Porroglossum | Medium indirect light (a couple of metres from a window) | Daily to every other day; never allow the medium to dry out | Pet-safe |
| Mountain Everlasting | Direct sun (at least 4-6 hours) | Every 2–3 weeks during growing season; minimal in winter | Pet-safe |
| Mountain Germander | Direct sun (at least 4-6 hours) | Rarely once established; water during dry spells in the first season | Mildly toxic to pets |
| Mountain Pansy | Bright indirect light (just back from a sunny window) | Water sparingly; allow soil to partially dry between waterings. | Pet-safe |
| Mountain Sweet Pitcher Plant | Direct sun (at least 4-6 hours) | Tray method, moist year-round | Pet-safe |
| Mountain Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Mouse Head Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks year-round, with a brief reduction after flowering | Mildly toxic to pets |
| Mouse-Tail Air Plant | Bright indirect light (just back from a sunny window) | Mist or soak every 10–14 days | Pet-safe |
| Muir's Living Pebble | Direct sun (at least 4-6 hours) | Only when the body begins to slightly wrinkle, roughly every 3-4 weeks during the autumn-spring growing season; completely dry through summer dormancy | Mildly toxic to pets |
| Muir's Rhinephyllum | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring–summer; minimal in winter | Pet-safe |
| Muir's Rhinephyllum | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 21-28 days in the growing season (autumn-spring); almost none in summer | Mildly toxic to pets |
| Muscari 'White Magic' | Direct sun (at least 4-6 hours) | Rainfall in most settings; water in dry spring spells | Pet-safe |
| Muscari armeniacum | Direct sun (at least 4-6 hours) | Rainfall in most settings; water in dry spring spells | Pet-safe |
| Myriophyllum aquaticum | Bright indirect light (just back from a sunny window) | Permanently in water; keep ponds topped up and stable | Mildly toxic to pets |
| Mystacid Aerangis | Bright indirect light (just back from a sunny window) | When roots appear silvery-white and the top of the medium is dry, roughly every 5-8 days | Pet-safe |
| Naked Crocus | Bright indirect light (just back from a sunny window) | Low to moderate — prefers moisture during active growth; dry in summer | Mildly toxic to pets |
| Namaqualand Cheiridopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn through early spring; completely dry June–August | Pet-safe |
| Nananthus transvaalensis | Direct sun (at least 4-6 hours) | Only when soil is bone dry, about every 10-14 days in growth; minimal in summer and winter dormancy | Mildly toxic to pets |
| 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 '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 '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-leaved Biarum | Direct sun (at least 4-6 hours) | Light watering in autumn–spring active growth; completely dry in summer | Toxic to pets |
| Narrow-leaved Gentian | Bright indirect light (just back from a sunny window) | Moderate; allow the top centimetre of soil to dry between waterings | Pet-safe |
| Narrow-Leaved Kaempferia | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil feels dry, roughly every 6-8 days in the growing season; cease or minimise during winter dormancy | Mildly toxic to pets |
| Narrowleaf gazania | Direct sun (at least 4-6 hours) | Every 10–21 days once established; twice weekly when newly planted | Mildly toxic to pets |
| Narvaez Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Natal Sundew | Direct sun (at least 4-6 hours) | Keep in a shallow tray of 1–2 cm pure water throughout the growing season; allow the tray to dry briefly in winter during dormancy. | Pet-safe |
| Nathalie's Ramonda | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season; minimal in winter | Pet-safe |
| Naureen's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during the active autumn-to-spring period; completely dry in summer | Pet-safe |
| Nautilocalyx lynchii | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days | Mildly toxic to pets |
| Navelwort | Medium indirect light (a couple of metres from a window) | Regularly in autumn–spring growing period; very little in summer dormancy | Mildly toxic to pets |
| Neat Bulbophyllum | Medium indirect light (a couple of metres from a window) | Every 4–6 days; mounted plants may need more frequent misting | Pet-safe |
| Neblina Sun Pitcher | Bright indirect light (just back from a sunny window) | Keep medium consistently moist; flush pitchers with pure water weekly | Pet-safe |
| Neglected Air Plant | Bright indirect light (just back from a sunny window) | Soak for 30 minutes to 2 hours once a week | Pet-safe |
| Neglected Pink | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry between waterings | Toxic to pets |
| Nejapa Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer; once every 5-8 weeks in winter | Pet-safe |
| Nel's Tongue Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; once a month or less in winter | Mildly toxic to pets |
| Neli's Rhombophyllum | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in growing season (autumn–spring); withhold almost entirely in summer | Mildly toxic to pets |
| Neli's Tongue Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in autumn and spring growing seasons; near-dry in summer dormancy and restricted in winter | Mildly toxic to pets |
| Nemesia 'Sunsatia Cranberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Nemesia strumosa 'Poetry Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Neoregelia 'Charm' | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Neoregelia 'Fireball' | Bright indirect light (just back from a sunny window) | Keep the central cup filled; water the mix when the top 2-3 cm is dry | Pet-safe |
| Neoregelia ampullacea | Bright indirect light (just back from a sunny window) | Keep the small cups topped up; mist or dip mounted plants every few days | Pet-safe |
| Nery's Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; reduce to every 4 weeks in winter | Pet-safe |
| Nest Air Plant | Bright indirect light (just back from a sunny window) | Mist or dip 2–3 times per week in summer; once per week in cool winter conditions. | Pet-safe |
| Nesting Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in cool seasons | Pet-safe |
| Net-scaled Ceratostylis | Bright indirect light (just back from a sunny window) | When the upper surface of the medium is just drying, roughly every 4-6 days | Pet-safe |
| Netted Iris | Direct sun (at least 4-6 hours) | Low — dry in summer dormancy; moderate when in growth | Toxic to pets |
| Nevada Bitterroot | Direct sun (at least 4-6 hours) | Moderate in spring; completely dry in summer dormancy | Pet-safe |
| Nevada Lewisia | Bright indirect light (just back from a sunny window) | Moderate in spring; almost none in summer dormancy | Mildly toxic to pets |
| New Zealand Everlasting Daisy | Direct sun (at least 4-6 hours) | Occasional; tolerant of dry spells once established | Mildly toxic to pets |
| New Zealand Gentian | Bright indirect light (just back from a sunny window) | Keep moist but never waterlogged; reduce in winter | Mildly toxic to pets |
| New Zealand Micro Sword | Bright indirect light (just back from a sunny window) | Permanently submerged aquatic plant | Pet-safe |
| Nicaraguan Guzmania | Bright indirect light (just back from a sunny window) | Refill cup every 7–10 days; flush monthly | Pet-safe |
| 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 |
| Nikko bog rosemary | Bright indirect light (just back from a sunny window) | Consistently moist; never dry out | Toxic to pets |
| Ninja Foamflower | Medium indirect light (a couple of metres from a window) | Every 5–7 days; increase in warm or dry periods | Pet-safe |
| Ninja Tiarella | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water deeply once or twice a week during dry periods | Mildly toxic to pets |
| Noble Carrion Flower | Bright indirect light (just back from a sunny window) | Every 14–21 days in the growing season; once monthly or less in winter | Pet-safe |
| Noble Cymbidium | Bright indirect light (just back from a sunny window) | Keep lightly and evenly moist, about every 5-7 days, reduced in winter | Pet-safe |
| Noble Fissidens | Medium indirect light (a couple of metres from a window) | Permanently submerged aquatic plant | Pet-safe |
| Noble Hand Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Nodding Greenhood | Medium indirect light (a couple of metres from a window) | Lightly moist during active growth (autumn–spring), roughly every 5-8 days | Pet-safe |
| Nodding Sun Pitcher | Bright indirect light (just back from a sunny window) | Keep substrate moist at all times; shallow tray or top-watering | Mildly toxic to pets |
| Nodding Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist to seasonally wet; tolerates more moisture than most Trilliums. | Mildly toxic to pets |
| Node-flower Cyanotis | Bright indirect light (just back from a sunny window) | Twice weekly in summer; reduce to once weekly in winter | Mildly toxic to pets |
| Notable Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of the medium is dry, approximately every 5-7 days; reduce slightly in winter | Mildly toxic to pets |
| Notch Cactus | Bright indirect light (just back from a sunny window) | When the mix is fully dry, sparingly every 2-3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Notch-Tipped Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Notched Butterwort | Medium indirect light (a couple of metres from a window) | Keep consistently moist; reduce slightly in cooler months | Mildly toxic to pets |
| Notocactus Magnificus | Direct sun (at least 4-6 hours) | Soak-and-dry: water deeply only when the mix is completely dry, roughly every 10-14 days in summer | Mildly toxic to pets |
| Oak-leaf Primulina | Medium indirect light (a couple of metres from a window) | Allow soil to become fairly dry between waterings | Mildly toxic to pets |
| Oaxacan Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week or soak for 20–30 minutes once per week; reduce in cooler months. | Pet-safe |
| 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 |
| Ochre Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to once every 2–3 weeks in winter rest | Pet-safe |
| Ocipus Alternanthera | Bright indirect light (just back from a sunny window) | Fully submerged aquatic; maintain in aquarium water continuously | Pet-safe |
| Odontoglossum crispum | Bright indirect light (just back from a sunny window) | Keep evenly moist year-round, watering roughly every 3-5 days so the mix never fully dries | Pet-safe |
| Ogon Sweet Flag | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water whenever the surface begins to feel barely damp | Mildly toxic to pets |
| Old Lady Pincushion | Direct sun (at least 4-6 hours) | When the mix is completely dry, roughly every 2-3 weeks in summer; keep nearly dry in winter | Pet-safe |
| Old Lady Pincushion | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Old Man Eriosyce | Direct sun (at least 4-6 hours) | When the potting mix has dried out completely, roughly every 14-21 days in the growing season | Pet-safe |
| Old Man Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Old Woman Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, every 10-14 days in summer | Pet-safe |
| Olive Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active growth (autumn to early spring); none in summer | Pet-safe |
| Olive Living Stones | Direct sun (at least 4-6 hours) | Seasonally — autumn watering only (September–November); completely dry during winter and summer dormancy | Pet-safe |
| Olive Porroglossum | Medium indirect light (a couple of metres from a window) | Water or mist daily in warm months; every 1-2 days in cooler months — roots must never fully dry out | Pet-safe |
| Olson's Begonia | Bright indirect light (just back from a sunny window) | Every 6–9 days during active growth, every 12–14 days in cooler months | Toxic to pets |
| Olympic St. John's Wort | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Toxic to pets |
| One-flower Masdevallia | Medium indirect light (a couple of metres from a window) | When the top 1 cm of moss or mix begins to dry, approximately every 3-5 days; never allow to dry out completely | Pet-safe |
| One-flowered Clintonia | Low light (north window or shaded room) | Maintain consistently moist soil; water deeply when the top 2 cm begins to dry | Mildly toxic to pets |
| Onzuka Bishop's Cap | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| Opposite-leaf Cliff Stonecrop | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; very rarely in winter | Pet-safe |
| Optic Living Stones | Direct sun (at least 4-6 hours) | Strictly seasonal: water sparingly during active growth (late summer to spring); completely dry in summer dormancy (June–August) | Pet-safe |
| Optical Plant | Direct sun (at least 4-6 hours) | Seasonally — water only during autumn active growth (September–November); completely dry rest of year | Pet-safe |
| Orange Prosthechea | Bright indirect light (just back from a sunny window) | When the top layer of the mix is dry, roughly every 6-9 days; reduce slightly in winter | Pet-safe |
| orange sinningia | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; stop completely during winter dormancy | Pet-safe |
| Orange Snow Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 7-10 days in spring and summer; every 4-6 weeks in autumn; none or barely any in winter | Pet-safe |
| Orange 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 Stonecrop | Direct sun (at least 4-6 hours) | Every 10-14 days when establishing; virtually rain-fed once mature | Pet-safe |
| Orange-Flowered Matucana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| 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 |
| Orbea ciliata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; rarely in winter | Mildly toxic to pets |
| Orbea decaisneana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Orbea lutea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; rarely in winter | Mildly toxic to pets |
| Orcutt's Liveforever | Direct sun (at least 4-6 hours) | Every 1–2 weeks in autumn through spring (growing season); withhold almost entirely in summer | Pet-safe |
| Ord River Sundew | Bright indirect light (just back from a sunny window) | Standing tray method (growing season); minimal watering (rest period) | Pet-safe |
| Oregon Stonecrop | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; monthly or less in winter | Pet-safe |
| Oregon Woodsia | Medium indirect light (a couple of metres from a window) | Water every 7–14 days, less in winter | Pet-safe |
| Oreocharis auricula | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days in growth | Mildly 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 |
| Ornate Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Orpen's Aloinopsis | Bright indirect light (just back from a sunny window) | Every 10–14 days in autumn–spring; minimal in summer | Pet-safe |
| Orpen's Aloinopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn through early spring; once a month or not at all through summer | Pet-safe |
| Orpheus Flower | Medium indirect light (a couple of metres from a window) | Lightly and consistently, keeping the root zone barely moist but never wet | Mildly toxic to pets |
| Orthophytum saxicola | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| Osteospermum 'Sunny Serena White' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Outstretched Maxillaria | Bright indirect light (just back from a sunny window) | Water when the top 1-2 cm of medium is dry, approximately every 3-5 days | Pet-safe |
| 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 |
| Owl Eye Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 10-14 days in summer; once every 5-8 weeks in winter | Pet-safe |
| Owl Eyes Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 2-3 weeks in spring and summer; nearly dry in winter | Pet-safe |
| Ox Tongue | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Pet-safe |
| Ox Tongue Plant | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| 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 |
| Oxlip | Medium indirect light (a couple of metres from a window) | Regularly; keep soil consistently moist, especially in summer | Mildly toxic to pets |
| Pachyphytum bracteosum | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| Pachyphytum compactum | Direct sun (at least 4-6 hours) | When soil is bone dry, about every 2 weeks in growth and rarely in winter | Pet-safe |
| Pachyphytum hookeri | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Pachyveria 'Clavifolia' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| Pachyveria 'Exotica' | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in growth, minimal in winter | Pet-safe |
| Pachyveria 'Powder Puff' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Pachyveria 'Powder Puff' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| 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 |
| 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 Echeveria | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Painted Masdevallia | Medium indirect light (a couple of metres from a window) | Water when medium is nearly dry, roughly every 1-2 days in active growth | Pet-safe |
| Painted Sonerila | Medium indirect light (a couple of metres from a window) | Every 4–6 days; keep lightly moist but never waterlogged | Pet-safe |
| Painted Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist throughout the growing season; never allow soil to dry out. | Mildly toxic to pets |
| Pale Beardtongue | Direct sun (at least 4-6 hours) | Low; highly drought-tolerant once established | Mildly toxic to pets |
| Pale Coryphantha | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 10-14 days in summer; every 4-6 weeks or less in winter | Pet-safe |
| Pale Silver Skin Plant | Direct sun (at least 4-6 hours) | Every 2–4 weeks in late summer through autumn (active growth into flowering); water sparingly in spring; completely withheld mid-summer | Pet-safe |
| Pale Yellow Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist through spring; reduce during summer dormancy | Mildly toxic to pets |
| Palmetto Sedge | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 5-8 days | Pet-safe |
| Panama Dichaea | Medium indirect light (a couple of metres from a window) | Keep consistently moist but never soggy; water every 3-5 days in warm months and every 5-8 days in cooler months — do not allow the plant to dry out completely as it has no pseudobulbs for water storage | Pet-safe |
| Pansy | Direct sun (at least 4-6 hours) | Twice-weekly watering | Pet-safe |
| Pansy Orchid | Bright indirect light (just back from a sunny window) | Every 3-5 days; up to 2-3 times weekly in warm, dry spells | Pet-safe |
| Pansy Orchid | Medium indirect light (a couple of metres from a window) | When the surface of the mix begins to dry, roughly every 4-6 days | Pet-safe |
| Paper Spine Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer and roughly monthly or less in winter | Pet-safe |
| Paphiopedilum 'Pinocchio' | Medium indirect light (a couple of metres from a window) | Every 4-7 days; keep evenly moist | Pet-safe |
| Paphiopedilum bellatulum | Medium indirect light (a couple of metres from a window) | Every 5-8 days; keep lightly moist, never waterlogged | Pet-safe |
| Paphiopedilum venustum | Medium indirect light (a couple of metres from a window) | Every 4-7 days; keep evenly moist | Pet-safe |
| Paraboea rufescens | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 6-9 days | Mildly toxic to pets |
| Paradox Sundew | Bright indirect light (just back from a sunny window) | Wet tray (growing season); nearly dry (dry season / dormancy) | Pet-safe |
| Parallel-Stripe Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Parodia microsperma | Bright indirect light (just back from a sunny window) | Soak-and-dry, roughly every 7-10 days in summer; keep dry in winter | Pet-safe |
| Parrot Pitcher Plant | Direct sun (at least 4-6 hours) | Keep permanently wet, standing in 1-3 cm of water (tray method); it tolerates brief flooding well | Pet-safe |
| Parsley Fern | Bright indirect light (just back from a sunny window) | Maintain consistent moisture; never allow to dry out completely | Mildly toxic to pets |
| Pazazz Mix Portulaca | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 7-14 days | Mildly toxic to pets |
| Peacock Ginger | Medium indirect light (a couple of metres from a window) | Regular during active growth; none during winter dormancy | Pet-safe |
| Peacock Moraea | Direct sun (at least 4-6 hours) | Regular watering autumn to late spring; completely dry in summer | Toxic to pets |
| Peacock Pink | Direct sun (at least 4-6 hours) | Low; allow soil to dry thoroughly between waterings | Mildly toxic to pets |
| Pearl Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in summer, minimal in winter | Pet-safe |
| Pearl Plant | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Pet-safe |
| Pearson's Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn to early spring); once per month or less in summer | Toxic to pets |
| Pebbled Tiger Jaws | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 14–21 days in the growing season and sparingly every 4–6 weeks in winter | Mildly toxic to pets |
| Peculiar Cheiridopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn–spring; none in summer | Pet-safe |
| Pelargonium 'Ardens' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; minimal in summer rest | Toxic to pets |
| Pelargonium '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 '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 '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 '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 '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 '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 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 triste | Direct sun (at least 4-6 hours) | Moderately in the autumn-spring growing season; keep dry during summer dormancy | Toxic to pets |
| Pelargonium-Flowered Stork's Bill | Direct sun (at least 4-6 hours) | Water sparingly; allow soil to dry out between waterings | Mildly toxic to pets |
| Peltate-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days during the growing season; every 3–4 weeks in winter | Pet-safe |
| Pennsylvania Sedge | Medium indirect light (a couple of metres from a window) | Water to establish, then largely self-sufficient; occasional deep watering in extended drought | Mildly toxic to pets |
| Penny Yellow Viola | Bright indirect light (just back from a sunny window) | When the top 1–2 cm of soil is dry, roughly every 4–6 days | Mildly toxic to pets |
| Penther's Cape Primrose | Bright indirect light (just back from a sunny window) | every 7–10 days during active growth, every 14–21 days in winter | Pet-safe |
| Peperomia 'Frost' | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, typically every 7-10 days | Pet-safe |
| Peperomia 'Napoli Nights' | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia 'Napoli Nights' (dark form) | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia 'Peppermill' | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia 'Pixie Lime' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia 'Rana Verde' | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia 'Schumi Red' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia 'Watermelon' (Ginny hybrid) | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia albovittata 'Minima' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia albovittata 'Rana Verde' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 7-12 days | Pet-safe |
| Peperomia asperula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days | Pet-safe |
| Peperomia axillaris | Bright indirect light (just back from a sunny window) | When the soil is almost fully dry, roughly every 12-16 days | Pet-safe |
| Peperomia blanda | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia caperata 'Burgundy' | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia caperata 'Luna Red' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia caperata 'Red Ripple' | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia caperata 'Rosso' | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, typically every 7-10 days | Pet-safe |
| Peperomia caperata 'Suzanne' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia caperata 'Teresa' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia clusiifolia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia crassifolia | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia dolabriformis | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 14-21 days | Pet-safe |
| Peperomia ecklonii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia floribunda | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia fraseri | Bright indirect light (just back from a sunny window) | When the top third of the soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia Frost | Bright indirect light (just back from a sunny window) | When the top 1-2 in (2.5-5 cm) of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia Ginny | Bright indirect light (just back from a sunny window) | Every 1-2 weeks | Pet-safe |
| Peperomia incana | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 12-18 days | Pet-safe |
| Peperomia maculosa | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 9-12 days | Pet-safe |
| Peperomia magnoliifolia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia magnoliifolia 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 8-13 days | Pet-safe |
| Peperomia marmorata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia obtusifolia 'Golden Gate' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, about every 7-14 days | Pet-safe |
| Peperomia obtusifolia 'Marble' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia obtusifolia 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia orba | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, about every 7-12 days | Pet-safe |
| Peperomia pereskiifolia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia pseudovariegata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia Rosso | Bright indirect light (just back from a sunny window) | When the soil is 50-75% dry, roughly every 10-14 days | Pet-safe |
| Peperomia trifolia | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia velutina | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 9-12 days | Pet-safe |
| Peperomia viridispica | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Pepperwort | Bright indirect light (just back from a sunny window) | Fully submerged or rooted in very shallow water; do not allow the substrate to dry out | Pet-safe |
| Percival's Cattleya | Bright indirect light (just back from a sunny window) | Every 7-10 days in active growth; reduce to every 14-21 days after pseudobulbs mature in autumn | Pet-safe |
| Perez de la Rosa's Mammillaria | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 6 weeks in winter | Pet-safe |
| Perplexing Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season; nearly dry from October to February | Pet-safe |
| Perplexing Rebutia | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn; once monthly or none in winter | Pet-safe |
| Persian Rosularia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season; once a month or less in winter | Mildly toxic to pets |
| Persian Violet | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is just dry, roughly every 3-5 days | Pet-safe |
| Peruvian Oroya | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, every 10-14 days in summer | Pet-safe |
| Petiole Sundew | Bright indirect light (just back from a sunny window) | Wet tray (October–March in Australia / spring–autumn in cultivation); reduced watering (cooler months) | Pet-safe |
| Petrocosmea iodioides | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of mix feels barely dry, roughly every 5-7 days | Mildly toxic to pets |
| Petrocosmea kerrii | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-8 days | Mildly toxic to pets |
| Petrocosmea nervosa | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of mix is just dry, about every 5-7 days | Mildly toxic to pets |
| Petrocosmea parryorum | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-8 days | Mildly 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 |
| Peyote-Like Turbinicarpus | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 14-21 days in summer and once a month or less in winter | Pet-safe |
| Pflanz's Chin Cactus | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn; almost none in winter | Pet-safe |
| Pflanz's Chin Cactus | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer; reduce to once every 4-6 weeks in winter | Pet-safe |
| Phalaenopsis 'Liodoro' | Bright indirect light (just back from a sunny window) | About every 7-10 days, when the bark begins to dry and roots silver over | Pet-safe |
| Phalaenopsis violacea | Bright indirect light (just back from a sunny window) | When the bark mix is nearly dry, roughly every 5-7 days | Pet-safe |
| Philippe Vapelle Cranesbill | Bright indirect light (just back from a sunny window) | Moderate; water during extended dry spells | Mildly toxic to pets |
| Philippine Ceratostylis | Bright indirect light (just back from a sunny window) | When the top of the medium begins to feel barely dry, roughly every 5-7 days | Pet-safe |
| Phlox drummondii 'Intensia Cabernet' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Phlox of Sheep Annual Phlox | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Mildly toxic to pets |
| Phoenix Moss | Medium indirect light (a couple of metres from a window) | Permanently submerged aquatic plant | Pet-safe |
| Phragmipedium 'Living Fire' | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; water every 1-3 days, often standing the pot in a shallow tray of clean water | Pet-safe |
| Phragmipedium besseae | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; water every 1-3 days and many growers stand the pot in 1-2 cm of clean water | Pet-safe |
| Piaranthus geminatus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Piaranthus punctatus | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Pickle Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks; reduce to monthly or less in winter | Pet-safe |
| Pilea 'Dark Mystery' | Bright indirect light (just back from a sunny window) | When the top inch of soil is dry, often 1-2 times per week | Pet-safe |
| Pilea 'Friendship' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-8 days | Pet-safe |
| Pilea aquarum | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water when the surface just begins to dry, roughly every 3-5 days | Pet-safe |
| Pilea cadierei 'Minima' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pilea microphylla '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 | Pet-safe |
| Pilea mollis | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pilea peperomioides 'Minima' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Pilea peperomioides 'Mojito' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Pilea peperomioides 'Sugar' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Pilea pubescens | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pilea pubescens 'Silver Cloud' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pilea serpyllacea | Bright indirect light (just back from a sunny window) | When the surface just begins to dry, roughly every 4-7 days | Pet-safe |
| Pillans' Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during late summer through early spring; fully dry in June–August | Pet-safe |
| Pima Pineapple Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Pincushion Cactus | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; monthly or less in autumn; none in winter | Pet-safe |
| Pinecone Cactus | Direct sun (at least 4-6 hours) | When the mix is bone dry, roughly every 14-21 days in the growing season; once a month or less from October to February | Pet-safe |
| Pinel's Aechmea | Bright indirect light (just back from a sunny window) | Refill the central cup every 5-7 days; water the medium when the top 2-3 cm is dry, roughly every 10-14 days | Pet-safe |
| Ping Pong Purple globe amaranth | Direct sun (at least 4-6 hours) | Every 5–7 days; allow soil surface to dry slightly | Pet-safe |
| Pinguicula 'Aphrodite' | Bright indirect light (just back from a sunny window) | Tray-water to keep the mix moist in growth; reduce for the drier winter rest | Mildly toxic to pets |
| Pinguicula 'Tina' | Bright indirect light (just back from a sunny window) | Keep lightly moist in summer; let the surface dry slightly between waterings in winter | Mildly toxic to pets |
| Pinguicula agnata | Bright indirect light (just back from a sunny window) | Keep the mix damp by tray-watering during growth; let it dry slightly in winter dormancy | Mildly toxic to pets |
| Pinguicula cyclosecta | Bright indirect light (just back from a sunny window) | Keep the medium damp via tray-watering in growth; nearly dry in winter dormancy | Mildly toxic to pets |
| Pinguicula Esseriana | Bright indirect light (just back from a sunny window) | Keep the gritty mix lightly moist in summer; let it dry considerably through the winter succulent phase | Mildly toxic to pets |
| Pinguicula Gigantea | Bright indirect light (just back from a sunny window) | Keep lightly moist in summer growth; let the surface dry slightly between waterings in the cooler 'winter succulent' phase | Mildly toxic to pets |
| Pinguicula laueana | Bright indirect light (just back from a sunny window) | Tray-water to keep the mix moist in summer; ease off for the dry winter rest | Mildly toxic to pets |
| Pinguicula lusitanica | Bright indirect light (just back from a sunny window) | Keep permanently wet; stand in shallow water at all times | Mildly toxic to pets |
| Pinguicula primuliflora | Bright indirect light (just back from a sunny window) | Keep permanently wet; stand in shallow water year-round, around 1-2 cm | Mildly toxic to pets |
| Pink Fawn Lily | Medium indirect light (a couple of metres from a window) | Regular watering in spring; minimal to none during summer dormancy | Mildly toxic to pets |
| Pink Fingers Orchid | Bright indirect light (just back from a sunny window) | Sparingly during active growth (autumn to spring); cease almost entirely during summer dormancy | Pet-safe |
| Pink Panther Restrepia | Medium indirect light (a couple of metres from a window) | Every 1–2 days; allow the medium to approach dryness but not fully dry | Pet-safe |
| Pink Pussytoes | Direct sun (at least 4-6 hours) | Low; water only when soil is completely dry | Pet-safe |
| Pink Quill Bromeliad | Bright indirect light (just back from a sunny window) | Mist thoroughly 2–3 times per week; soak in room-temperature water for 20–30 minutes once a week during active growth. | Pet-safe |
| Pink Rain Lily | Direct sun (at least 4-6 hours) | Regular in summer; minimal in winter | Mildly toxic to pets |
| Pink Rock Jasmine | Direct sun (at least 4-6 hours) | Very sparingly; driest in winter | Pet-safe |
| Pink Rock Orchid | Bright indirect light (just back from a sunny window) | When the potting medium is nearly dry, roughly every 5-7 days in summer; reduce to every 14-21 days in winter to trigger blooming | Pet-safe |
| Pink Skyrocket Foamflower | Medium indirect light (a couple of metres from a window) | Once or twice per week during the growing season; reduce in autumn and winter. | Mildly toxic to pets |
| Pink Storm Lily | Direct sun (at least 4-6 hours) | Moderate in summer growth; minimal in winter | Toxic to pets |
| Pink Sundew | Bright indirect light (just back from a sunny window) | Tray method, continuously wet | Pet-safe |
| Pinnate Primulina | Medium indirect light (a couple of metres from a window) | Every 7–10 days, allowing the top 2 cm of soil to dry between waterings | Mildly toxic to pets |
| Piper's Bellflower | Direct sun (at least 4-6 hours) | Sparingly; allow near-drying between waterings | Pet-safe |
| Pipsissewa | Low light (north window or shaded room) | Sparingly — allow soil to dry almost completely between waterings; low water requirement | Mildly toxic to pets |
| Pires's Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; very sparingly during dormancy | Mildly toxic to pets |
| Pitton's Houseleek | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Pet-safe |
| Pixie Lime Peperomia | Bright indirect light (just back from a sunny window) | When the top 2.5-4 cm (1-1.5 in) of mix is dry, often every 7-12 days | Pet-safe |
| Plaid Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth; minimal in winter | Pet-safe |
| Pleasant Air Plant | Direct sun (at least 4-6 hours) | Mist every 2–3 days in summer; once a week in winter. | Mildly toxic to pets |
| Pleasant Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn growth; none in summer | Pet-safe |
| Pleasant Lembocarpus | Low light (north window or shaded room) | Keep substrate consistently moist during the growing season; withhold water during dormancy | Pet-safe |
| 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 '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 |
| Pleione bulbocodioides | Bright indirect light (just back from a sunny window) | Regularly during active leaf growth; reduce sharply to nearly dry through winter dormancy | Pet-safe |
| Pleione formosana | Bright indirect light (just back from a sunny window) | Regularly when in leaf and growth; reduce to occasional misting and near-dry during winter dormancy | Pet-safe |
| Pleione speciosa | Bright indirect light (just back from a sunny window) | Regularly while in leaf and growth; cut back to nearly dry during winter dormancy | Pet-safe |
| Pleiospilos bolusii | Direct sun (at least 4-6 hours) | Sparingly and seasonally: water in spring and autumn when soil is dry; keep nearly dry in mid-summer and winter | Pet-safe |
| Pleiospilos compactus | Direct sun (at least 4-6 hours) | Seasonally: water in spring and autumn when soil is dry; keep nearly dry in mid-summer and winter | Pet-safe |
| Pleiospilos nelii 'Royal Flush' | Direct sun (at least 4-6 hours) | Sparingly; soak only when soil is fully dry and leaves slightly wrinkle, roughly every 3-4 weeks in growth | Mildly toxic to pets |
| Pleiospilos simulans | Direct sun (at least 4-6 hours) | Seasonally: water in spring and autumn when soil is dry; keep nearly dry in mid-summer and winter | Pet-safe |
| Pleurothallis grobyi | Low light (north window or shaded room) | Keep roots evenly moist; water every 2-3 days potted, or mist/water mounted plants daily | Mildly toxic to pets |
| Pleurothallis restrepioides | Low light (north window or shaded room) | Keep evenly moist, watering roughly every 2-3 days; do not allow a hard dry-out | Mildly toxic to pets |
| Pleurothallis truncata | Low light (north window or shaded room) | Keep evenly moist; water every 2-3 days potted or mist mounted plants daily | Mildly toxic to pets |
| Plover Eggs | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (spring–autumn); once a month or less in winter | Pet-safe |
| Pogostemon erectus | Bright indirect light (just back from a sunny window) | Permanently submerged; 25-50% weekly water changes | Mildly toxic to pets |
| Pogostemon helferi | Bright indirect light (just back from a sunny window) | Permanently submerged; 25-50% weekly water changes | Mildly toxic to pets |
| Pohl's Air Plant | Bright indirect light (just back from a sunny window) | Soak for 20–30 minutes once per week, or mist thoroughly 2–3 times per week; reduce frequency in cool winter months. | Pet-safe |
| Pointed-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| 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 |
| Polished Air Plant | Bright indirect light (just back from a sunny window) | Mist thoroughly 2–3 times per week, or soak briefly once per week in warm conditions; reduce in winter. | Pet-safe |
| Polka Dot Plant | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil feels dry, roughly every 5-7 days in the growing season | Pet-safe |
| Polypody Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of medium is dry, roughly every 7-10 days | Pet-safe |
| 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 |
| Potbelly Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week; the bulbous base dries faster than larger species so check moisture more frequently in hot, dry weather. | Pet-safe |
| Pouch Flower | Medium indirect light (a couple of metres from a window) | When the top of the compost begins to feel barely dry | Mildly toxic to pets |
| Pouch-Flowered Pearcea | Bright indirect light (just back from a sunny window) | Every 6–8 days during active growth; reduce in winter dormancy | Pet-safe |
| Powder Puff Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 2-3 weeks in spring and summer; little to none in winter | Pet-safe |
| Powder Puff Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in spring and summer; once every 4-6 weeks in winter | Pet-safe |
| Powdery Echeveria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 12-16 days; it is unusually drought-tolerant | Pet-safe |
| Prairie Gentian | Direct sun (at least 4-6 hours) | Low — drought tolerant once established | Pet-safe |
| Prairie Violet | Bright indirect light (just back from a sunny window) | Fortnightly or less once established; drought-tolerant | Pet-safe |
| Prayer plant | Medium indirect light (a couple of metres from a window) | When the top 1 cm of soil is just dry, every 4-6 days | Pet-safe |
| Pretty Crocus | Direct sun (at least 4-6 hours) | Low — rainfall-dependent during active growth; fully dry during summer dormancy | Mildly toxic to pets |
| Pretty Living Stone | Direct sun (at least 4-6 hours) | Only when the old leaf pair is fully shrivelled (during active growth, roughly every 2-3 weeks); no water during leaf renewal | Pet-safe |
| Pretty Peacock Ginger | Medium indirect light (a couple of metres from a window) | Regular during the growing season (spring to autumn); minimal to none in winter | Pet-safe |
| Pretty Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Pretty Trichocentrum | Bright indirect light (just back from a sunny window) | When the top of the bark is dry, roughly every 7-9 days; slightly drier in winter | Pet-safe |
| Prickly Ice Plant | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in spring and summer; once monthly or less in winter | Pet-safe |
| Primos' Vanheerdea | Direct sun (at least 4-6 hours) | Every 14-21 days during autumn to spring when the soil is completely dry; no water in summer | Mildly toxic to pets |
| Primrose | Medium indirect light (a couple of metres from a window) | Weekly watering | Toxic to pets |
| Primrose Huernia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Primrose-Flower Begonia | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of compost begins to dry, roughly every 5-8 days in growth | Toxic to pets |
| primrose-leaf cape primrose | Medium indirect light (a couple of metres from a window) | Every 7–10 days; keep evenly moist but never waterlogged | Pet-safe |
| Primrose-leaf Streptocarpus | Medium indirect light (a couple of metres from a window) | every 5–8 days in the growing season, every 10–14 days in winter | Pet-safe |
| Primula × 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 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 |
| Primula Obconica | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 3-5 days while flowering | Mildly toxic to pets |
| Primulina 'Dreamtime' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 7-10 days | Mildly toxic to pets |
| Primulina 'Loki' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Mildly toxic to pets |
| Primulina 'Patina' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-12 days | Mildly toxic to pets |
| Primulina (Chirita) | Bright indirect light (just back from a sunny window) | When the top of the soil feels dry | Mildly toxic to pets |
| Primulina heterotricha | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 7-10 days | Mildly toxic to pets |
| Primulina linearifolia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Mildly toxic to pets |
| Primulina tamiana | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, about every 5-8 days | Mildly toxic to pets |
| Prince Masdevallia | Medium indirect light (a couple of metres from a window) | Daily to every 2 days; medium should remain evenly moist at all times | Pet-safe |
| Profusion White Zinnia | Direct sun (at least 4-6 hours) | When the top 3–5 cm of soil is dry, roughly every 5–7 days in summer | Pet-safe |
| Proliferous Pleurothallis | Medium indirect light (a couple of metres from a window) | When the medium surface just starts to dry, roughly every 4-6 days | Pet-safe |
| Prostrate Raphionacme | Bright indirect light (just back from a sunny window) | Weekly during active growth; monthly or less in dormancy | Mildly toxic to pets |
| Protruding Air Plant | Bright indirect light (just back from a sunny window) | 2–3 times per week misting, or a 20-minute soak once a week | Pet-safe |
| Pseudolithos cubiformis | Bright indirect light (just back from a sunny window) | Very sparingly; only when fully dry and the body begins to soften, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| Pseudolithos migiurtinus | Bright indirect light (just back from a sunny window) | Very sparingly; only when fully dry, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| pubescent bladderwort | Medium indirect light (a couple of metres from a window) | Keep media permanently moist; do not allow to dry out | Pet-safe |
| Puebla Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist 2–3 times weekly in dry conditions | Pet-safe |
| 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 Bacopa | Bright indirect light (just back from a sunny window) | Fully submerged aquatic plant; maintain in aquarium water continuously | Pet-safe |
| Purple Cliff Brake | Direct sun (at least 4-6 hours) | every 2-3 weeks | Mildly toxic to pets |
| Purple Cliff Brake Fern | Bright indirect light (just back from a sunny window) | When the soil is nearly dry throughout, roughly every 10-14 days in summer | Pet-safe |
| 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 Fingers | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through early spring; none in summer | Pet-safe |
| Purple Mountain Heath | Bright indirect light (just back from a sunny window) | Regular — keep consistently moist but never waterlogged | Mildly toxic to pets |
| Purple Mountain Saxifrage | Bright indirect light (just back from a sunny window) | Every 5–7 days during the growing season; maintain slight moisture at all times | Pet-safe |
| Purple Paintbrush | Direct sun (at least 4-6 hours) | Rarely; dry to very dry conditions | Mildly toxic to pets |
| Purple Pitcher Plant | Direct sun (at least 4-6 hours) | Keep constantly moist by standing the pot in a tray of rainwater or distilled water at all times | Pet-safe |
| Purple Stelis | Medium indirect light (a couple of metres from a window) | Every 2–3 days in active growth; reduce slightly in cooler months | Pet-safe |
| Pusillus Miniature Sweet Flag | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; water whenever the surface starts to dry, every 2-4 days in pots | Mildly toxic to pets |
| Pygmy Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in growing season, once per week in winter | Pet-safe |
| Pygmy Bucephalandra | Low light (north window or shaded room) | Submerged aquatic — 20-30% water changes weekly to maintain water quality. | Toxic to pets |
| Pygmy Cactus | Bright indirect light (just back from a sunny window) | When soil is dry, about every 7-10 days in growth; keep dry in winter | Pet-safe |
| Pygmy Rwandan Water Lily | Direct sun (at least 4-6 hours) | Keep roots in very shallow, warm, constantly moist conditions — water depth 1–3 cm over the substrate | Mildly toxic to pets |
| Pygmy Sundew | Direct sun (at least 4-6 hours) | Keep soil moist via a shallow tray; top up as it dries | Pet-safe |
| Pygmy Tongue Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer; once every 4-6 weeks or less in winter | Mildly toxic to pets |
| Pyramidal Bugle | Bright indirect light (just back from a sunny window) | Every 10–14 days; minimal irrigation once established | Mildly toxic to pets |
| Pyrenean Merendera | Direct sun (at least 4-6 hours) | Minimal; naturally dry in summer | Toxic to pets |
| Pyrenean Ramonda | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season; minimal in winter | Pet-safe |
| Pyrenean Rock Jasmine | Direct sun (at least 4-6 hours) | Low — water from below and keep dry in winter | Mildly toxic to pets |
| Pyrrosia hastata | Bright indirect light (just back from a sunny window) | When soil is nearly dry throughout, roughly every 7-12 days | Mildly 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 |
| Quehl's Chin Cactus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Quehlianum Chin Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Quelch's Bladderwort | Bright indirect light (just back from a sunny window) | Keep sphagnum constantly moist during active growth; reduce slightly in winter rest period | Mildly toxic to pets |
| Rabbit Foot Prayer Plant | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil feels dry, roughly every 7-10 days in summer | Pet-safe |
| Rabiea albinota | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in active growth; keep nearly dry in winter | Mildly toxic to pets |
| Raceme Masdevallia | Medium indirect light (a couple of metres from a window) | Daily or every 1-2 days; medium should not dry out between waterings | Pet-safe |
| Rainbow Hedgehog Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Rainbow Pincushion | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Rainbow Plant | Direct sun (at least 4-6 hours) | Keep substrate consistently wet using the tray method | Mildly toxic to pets |
| Raindrop Peperomia | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, often roughly weekly in the growing season | Pet-safe |
| Rainer's Bellflower | Direct sun (at least 4-6 hours) | Moderately during growth; sparingly in winter | Pet-safe |
| rainha do abismo | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; allow near-dry dormancy in winter | Pet-safe |
| 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 |
| Ram's Head Catasetum | Direct sun (at least 4-6 hours) | Heavily during growth; completely stopped during leafless dormancy | Pet-safe |
| Rambling Sundew | Bright indirect light (just back from a sunny window) | Tray method during winter growing season (June–November); completely dry summer dormancy (December–May in the southern hemisphere) | Mildly toxic to pets |
| Rauwolff's Eminium | Direct sun (at least 4-6 hours) | Moderate during spring growing season; bone dry in summer dormancy | Toxic to pets |
| Rayed Prosthechea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of bark is dry, roughly every 7-10 days | Pet-safe |
| Rebutia krainziana | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in summer; none in winter | Mildly toxic to pets |
| Rechinger's Rosularia | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; very rarely in winter | Pet-safe |
| Red Ceratostylis | Bright indirect light (just back from a sunny window) | When the surface of the medium begins to dry, roughly every 4-6 days | Pet-safe |
| Red Dragon Venus Flytrap | Direct sun (at least 4-6 hours) | Keep in standing water year-round except dormancy | Pet-safe |
| Red Fescue | Bright indirect light (just back from a sunny window) | Infrequent — drought-tolerant once established | Pet-safe |
| Red Groove Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| red nerve plant | Medium indirect light (a couple of metres from a window) | Every 5–10 days; water when top 1–2 cm of soil is dry | Pet-safe |
| Red Nerve Plant | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to feel dry, roughly every 5-7 days | Pet-safe |
| Red Polka Dot Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days; slightly less in winter | Pet-safe |
| Red Stem Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Red Tube Pitcher | Direct sun (at least 4-6 hours) | Keep growing medium permanently moist using a tray of 2-4 cm of rainwater at all times during the growing season | Pet-safe |
| Red-bristled Dragon Orchid | Medium indirect light (a couple of metres from a window) | Every 2–3 days; roots must not dry out | Pet-safe |
| Red-petal Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting or watering every 1-2 days; never allow to dry | Pet-safe |
| Reddish Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to dry out fully) | Pet-safe |
| Reichenbach's Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist 2–3 times weekly | Pet-safe |
| Reichenbach's Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in warm weather; every 2–3 days in cooler months | Pet-safe |
| Reinwardtii Haworthia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Reitz's sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; cease in dormancy | Pet-safe |
| Reko's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Remote Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist 2–3 times weekly between soaks | Pet-safe |
| Restrepia antennifera | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water every 2-3 days so the medium never dries out fully | Pet-safe |
| Restrepia elegans | Medium indirect light (a couple of metres from a window) | Keep the medium consistently moist; water every 2-3 days, never allowing it to dry out | Pet-safe |
| Restrepia guttulata | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water every 2-3 days, never letting the medium dry out | Pet-safe |
| Restrepia-mimic Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 5–7 days (potted); near-daily misting if mounted | Pet-safe |
| Resurrection fern | Medium indirect light (a couple of metres from a window) | Mist or moisten every 2-4 days; let it dry between | Mildly toxic to pets |
| Resurrection Fern | Medium indirect light (a couple of metres from a window) | Allow to dry slightly between waterings; roughly every 7-10 days, or mist daily when mounted | Pet-safe |
| Resurrection Gesneriad | Medium indirect light (a couple of metres from a window) | Once a week in the growing season; sparingly in winter | Pet-safe |
| Resurrection Spike Moss | Bright indirect light (just back from a sunny window) | Can be kept moist year-round or allowed to dry fully and rehydrated on demand | Pet-safe |
| Reunion Island Begonia | Medium indirect light (a couple of metres from a window) | When the top 2 cm of compost feels dry, approximately every 7 days | Toxic to pets |
| Revolute Tromotriche | Direct sun (at least 4-6 hours) | Every 3–4 weeks in the growing season; minimal to none in dormancy | Mildly toxic to pets |
| 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 |
| Rhinephyllum broomii | Direct sun (at least 4-6 hours) | Only once the soil is completely dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| 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 |
| 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 |
| Rhombus-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in winter | Pet-safe |
| Rhynchostylis gigantea | Bright indirect light (just back from a sunny window) | Daily or every other day in warm growth for bare roots; reduce to a few times weekly in the cooler rest | Mildly toxic to pets |
| Ribbed Brain Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season; reduce to once a month or less in winter | Pet-safe |
| Ribes Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting; substrate must remain moist at all times | Pet-safe |
| Ridged Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; very sparingly in winter | Pet-safe |
| Ridleyandra sp. | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of mix is just drying, roughly every 4-7 days | Mildly toxic to pets |
| Rigid Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; almost none in winter | Pet-safe |
| Rincon Thelocactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; rarely in winter. | Pet-safe |
| 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 |
| Rock Candytuft | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Pet-safe |
| Rock Daffodil | Direct sun (at least 4-6 hours) | Minimal; moderate during active growth, completely dry in summer | Toxic to pets |
| Rock Liveforever | Direct sun (at least 4-6 hours) | Every 3–5 weeks in summer (near-dry dormancy), every 2–3 weeks in winter (active season) | Pet-safe |
| Rock Speedwell | Bright indirect light (just back from a sunny window) | Once every 7–10 days during the growing season; reduce markedly in winter. | Pet-safe |
| Rocky Mountain Woodsia | Medium indirect light (a couple of metres from a window) | Water when the top 2–3 cm of medium feel dry | Pet-safe |
| Rodent Tuber | Medium indirect light (a couple of metres from a window) | Consistently moist during growing season; reduce in dormancy | Toxic to pets |
| Rodigas' Vriesea | Bright indirect light (just back from a sunny window) | Refill the central cup every 5-7 days; water the potting medium when the top 2 cm is dry, roughly every 10-14 days | Pet-safe |
| Rodriguezia lanceolata | Bright indirect light (just back from a sunny window) | Water as roots approach dryness, roughly every 2-4 days on a mount, less in pots | Mildly toxic to pets |
| Rodriguezia secunda | Bright indirect light (just back from a sunny window) | Every 2-4 days when mounted; every 4-6 days in a small basket, keeping it lightly moist | Mildly toxic to pets |
| Roezl's Dracula | Medium indirect light (a couple of metres from a window) | When the medium surface just barely begins to dry, roughly every 3-5 days | Pet-safe |
| Roezl's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Daily or every other day; medium must never fully dry | Pet-safe |
| Roller Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; minimal in winter | Pet-safe |
| Rollers Houseleek | Direct sun (at least 4-6 hours) | Every 14-21 days in spring and summer; barely at all in winter | Pet-safe |
| Rood's Vanheerdea | Direct sun (at least 4-6 hours) | Every 14-21 days in autumn through spring; essentially none in summer | Mildly toxic to pets |
| Rose Grass | Direct sun (at least 4-6 hours) | Moderate during growth; almost dry in winter dormancy | Pet-safe |
| Rose of Jericho (Resurrection Plant) | Bright indirect light (just back from a sunny window) | Keep moist; refresh water frequently | Pet-safe |
| Rose Pincushion Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in spring and summer; little to none in winter | Pet-safe |
| Rose Pincushion Cactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Rose Queen Epimedium | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Mildly 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 |
| Rosette Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; minimal in winter | Pet-safe |
| Rosette Rock Jasmine | Direct sun (at least 4-6 hours) | Weekly in the growing season; reduce significantly in winter | Mildly toxic to pets |
| Rotala 'H'ra' | Bright indirect light (just back from a sunny window) | Submerged permanently; 30-50% aquarium water changes weekly | Mildly toxic to pets |
| Rotala indica | Bright indirect light (just back from a sunny window) | Submerged permanently; 30-50% aquarium water changes weekly | Mildly toxic to pets |
| Rotala macrandra | Bright indirect light (just back from a sunny window) | Submerged permanently; 30-50% aquarium water changes weekly | Mildly toxic to pets |
| Rotala nanjenshan | Bright indirect light (just back from a sunny window) | Submerged permanently; 30-50% aquarium water changes weekly | Mildly toxic to pets |
| Rotala wallichii | Bright indirect light (just back from a sunny window) | Submerged permanently; 30-50% aquarium water changes weekly | Mildly toxic to pets |
| Roth's Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times a week; soak 10–20 minutes weekly if conditions are dry | Pet-safe |
| Rothschild's Bulbophyllum | Medium indirect light (a couple of metres from a window) | Keep evenly moist in growth; water every 3-5 days | Pet-safe |
| Rothschild's Bulbophyllum | Bright indirect light (just back from a sunny window) | Water when the top layer of the medium begins to dry, roughly every 3-5 days | Pet-safe |
| Rothschild's Cirrhopetalum | Medium indirect light (a couple of metres from a window) | Every 5-7 days during the growing season; every 10-14 days in cooler months | Pet-safe |
| Round-leaf Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; reduce significantly in winter | Pet-safe |
| Round-leaf Rosularia | Direct sun (at least 4-6 hours) | Every 14–21 days during spring and summer; minimal in winter | Pet-safe |
| Round-Leaved Rhoogeton | Low light (north window or shaded room) | Every 4–6 days; keep substrate consistently moist | Pet-safe |
| Round-leaved Wintergreen | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water whenever the top 1–2 cm of soil begins to dry | Mildly toxic to pets |
| Round-lobed Hepatica | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; minimal in summer dormancy | Mildly toxic to pets |
| Roundleaf Sundew | Direct sun (at least 4-6 hours) | Keep saturated; stand in 1-3 cm of pure water through the growing season | Mildly toxic to pets |
| Rowlee's Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days in summer; every 2–4 days in cooler months | Pet-safe |
| 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 Flush Split Rock | Direct sun (at least 4-6 hours) | Only during active growth: late summer through winter and into early spring; stop completely while leaves are splitting | Pet-safe |
| Ruby Glow Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in spring/summer; every 4–6 weeks in winter | Pet-safe |
| Rudbeckia 'Toto Gold' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in containers | Mildly toxic to pets |
| Ruedebusch's Schwantesia | Direct sun (at least 4-6 hours) | Every 10-14 days in the autumn-winter growing season; taper in spring; almost none from late spring through summer | Mildly toxic to pets |
| Ruellia devosiana | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-6 days in summer | Mildly toxic to pets |
| Rusch's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during the active autumn-to-spring period; completely dry in summer | Pet-safe |
| Ruschia uncinata | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth | Mildly toxic to pets |
| Rusty Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in spring and summer; every 2–3 weeks in autumn and winter | Pet-safe |
| Rustyback Fern | Bright indirect light (just back from a sunny window) | Infrequently; allow to dry between waterings | Pet-safe |
| Ryegrass Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week or soak for 20 minutes weekly | Pet-safe |
| Sad Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup every 5–7 days; soil every 2–3 weeks | Pet-safe |
| Saffron Air Plant | Direct sun (at least 4-6 hours) | Twice weekly in summer, once weekly in winter | Pet-safe |
| Sagittaria subulata | Bright indirect light (just back from a sunny window) | Permanently submerged; maintain water level and do 25-30% partial water changes weekly | Mildly toxic to pets |
| Saintpaulia 'Buckeye Fanfare' | Bright indirect light (just back from a sunny window) | When the top of the mix is just dry, about every 5-7 days | Pet-safe |
| Saintpaulia 'Jolly Ellie' | Bright indirect light (just back from a sunny window) | When the surface of the mix is just dry, roughly every 5-7 days | Pet-safe |
| Saintpaulia 'Mac's Black Pearl' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil feels dry, roughly every 5-7 days | Pet-safe |
| Saintpaulia 'Ness' Dipity' | Bright indirect light (just back from a sunny window) | When the top of the mix is just dry to the touch, about every 5-7 days | Pet-safe |
| Saintpaulia 'Optimara Montana' | Bright indirect light (just back from a sunny window) | When the surface of the mix is just dry, roughly every 5-7 days | Pet-safe |
| Saintpaulia 'Powderpuff' | Bright indirect light (just back from a sunny window) | When the surface of the mix is just dry, roughly every 5-7 days | Pet-safe |
| Saintpaulia 'Rob's Boolaroo' | Bright indirect light (just back from a sunny window) | When the top of the mix feels just dry, typically every 5-7 days | Pet-safe |
| Saintpaulia 'Winter Lace' | Bright indirect light (just back from a sunny window) | When the top of the mix feels just dry, about every 5-7 days | Pet-safe |
| Salvia splendens 'Sizzler Burgundy' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Mildly toxic to pets |
| Salvia splendens 'Vista Red' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer heat | Pet-safe |
| Salvinia molesta | Bright indirect light (just back from a sunny window) | Keep floating on warm, calm freshwater at all times; top up evaporation | Mildly toxic to pets |
| Salvinia natans | Bright indirect light (just back from a sunny window) | Keep floating on calm freshwater continuously; replace evaporated water as needed | Mildly toxic to pets |
| San Gabriel Mountains Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks autumn through spring; none or minimal in summer | Pet-safe |
| Sand Crocus | Direct sun (at least 4-6 hours) | Water sparingly; keep dry in summer | Toxic to pets |
| Sand Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Sand Everlasting | Direct sun (at least 4-6 hours) | Every 2–4 weeks; minimal in winter | Mildly toxic to pets |
| Sand Phlox | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; drought-tolerant | Pet-safe |
| Sand Pink | Direct sun (at least 4-6 hours) | Low; water only when soil is completely dry, roughly every 2–3 weeks in the growing season | Mildly toxic to pets |
| Sand Rose | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry, roughly every 10–14 days in summer and every 3–4 weeks in winter | Mildly toxic to pets |
| Sandy Sulcorebutia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; very sparingly or not at all in winter | Pet-safe |
| 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 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 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 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 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 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 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 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 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 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 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 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 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 |
| Sarcochilus ceciliae | Bright indirect light (just back from a sunny window) | Water every 2-4 days in growth, allowing the medium to approach dryness between waterings | Pet-safe |
| Sarcochilus falcatus | Bright indirect light (just back from a sunny window) | Water every 2-3 days, keeping the roots moist but well aired | Pet-safe |
| Sarcochilus hartmannii | Bright indirect light (just back from a sunny window) | Water every 2-4 days, keeping the medium damp but never waterlogged | Pet-safe |
| Sardinian Glory of the Snow | Bright indirect light (just back from a sunny window) | Low; natural rainfall sufficient in most temperate climates | Mildly 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 |
| Sarracenia Minor | Direct sun (at least 4-6 hours) | Keep permanently wet; stand the pot in 1-3 cm of pure water during the growing season | Mildly toxic to pets |
| Sarracenia Rubra | Direct sun (at least 4-6 hours) | Keep the soil constantly wet; stand the pot in 1-3 cm of water during the growing season | Pet-safe |
| Sarracenia-like sun pitcher | Bright indirect light (just back from a sunny window) | Daily; keep media permanently moist | Pet-safe |
| Sawtooth Venus flytrap | Direct sun (at least 4-6 hours) | Keep continuously moist via the tray method | Pet-safe |
| Scabiosa columbaria 'Butterfly Blue' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries; about weekly in the growing season | Pet-safe |
| Scaped Bergeranthus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Mildly toxic to pets |
| Scarlet Ball Cactus | Direct sun (at least 4-6 hours) | When the mix is dry, about every 10-14 days in growth; sparingly in winter | Pet-safe |
| Scarlet Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 7-10 days in spring and summer; every 3-5 weeks in autumn; very sparingly in winter | Pet-safe |
| Scarlet Freesia | Direct sun (at least 4-6 hours) | Low to moderate during active growth; dry during summer dormancy | Pet-safe |
| Scarlet Maxillaria | Bright indirect light (just back from a sunny window) | Every 2–3 days in growth, reduce slightly in winter | Pet-safe |
| Scarlet Sundew | Direct sun (at least 4-6 hours) | Tray method in winter–spring; reduce or cease in summer dormancy | Mildly 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 |
| Schied's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 6-8 weeks in winter | Pet-safe |
| 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 |
| Schwantes' Living Stone | Direct sun (at least 4-6 hours) | Every 10-21 days during the active autumn-to-spring period; none in summer | Pet-safe |
| Schwantes' Living Stones | Direct sun (at least 4-6 hours) | Every 3–4 weeks in autumn; withhold in summer and winter | Pet-safe |
| Schwantesia pillansii | Direct sun (at least 4-6 hours) | Only when soil is completely dry, roughly every 12-16 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Scilla siberica | Direct sun (at least 4-6 hours) | Rainfall in most settings; rarely needs watering | Mildly toxic to pets |
| Scot's Maidenhair Spleenwort | Medium indirect light (a couple of metres from a window) | Keep the gritty mix lightly and evenly moist; water when the surface starts to dry | Pet-safe |
| Scott's Angraecum | Bright indirect light (just back from a sunny window) | Daily during growing season (approx. 10 months), every other day in December–January | Pet-safe |
| Sea Lettuce | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in winter (active growth); monthly or less in summer (dormancy) | Pet-safe |
| Sea Mouse-ear | Direct sun (at least 4-6 hours) | Minimal; rely on rainfall in outdoor settings | Mildly toxic to pets |
| Sea Spleenwort | Medium indirect light (a couple of metres from a window) | When the top 1–2 cm of growing medium feels dry | Pet-safe |
| Sea Stork's Bill | Direct sun (at least 4-6 hours) | Water sparingly; this species is adapted to dry, free-draining coastal soils | Mildly toxic to pets |
| Sea Thrift | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Pet-safe |
| Sea Urchin Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly weekly to fortnightly in summer; keep nearly dry in winter | Pet-safe |
| Sea Urchin Copiapoa | Direct sun (at least 4-6 hours) | Every 14-21 days in summer; once a month or completely dry in winter | Pet-safe |
| Sedum palmeri | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Seersucker Plant | 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 | Mildly toxic to pets |
| Sekete's Restrepia | Bright indirect light (just back from a sunny window) | Every 2-4 days; keep evenly moist | Pet-safe |
| Sempervivum 'Black' | Direct sun (at least 4-6 hours) | When soil is fully dry, every 10-14 days in growth; very little in winter | Pet-safe |
| Sempervivum 'Commander Hay' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum 'Emerald Empress' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer, far less if grown outdoors in the ground | Pet-safe |
| Sempervivum 'Killer' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; almost none in winter | Pet-safe |
| Sempervivum 'Oddity' | Direct sun (at least 4-6 hours) | When the soil is fully dry, sparingly; roughly every 2 weeks in summer and minimal in winter | Pet-safe |
| Sempervivum 'Pacific Blue Ice' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum 'Red Lion' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; almost none in winter | Pet-safe |
| Sempervivum 'Reinhard' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum calcareum | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth, only when the soil is fully dry; little to none in winter | Pet-safe |
| Sempervivum heuffelii | Direct sun (at least 4-6 hours) | When the soil is fully dry, sparingly; roughly every 2 weeks in summer and very little in winter | Pet-safe |
| Sempervivum montanum | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; keep nearly dry in winter | Pet-safe |
| Serissa Bonsai | Bright indirect light (just back from a sunny window) | When the surface just starts to dry, often every 1-3 days in growth | Pet-safe |
| Sessile Bellwort | Medium indirect light (a couple of metres from a window) | Moderate; keep soil moist in spring and early summer. Tolerates periodic dryness once established. | Pet-safe |
| Seven-Spined Discocactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, approximately every 10-14 days in the growing season; once a month or less in winter | Pet-safe |
| Shade Mudflower | Medium indirect light (a couple of metres from a window) | Fully submerged — permanent aquatic plant | Pet-safe |
| Shadow Adromischus | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks in the active season; monthly in winter | Pet-safe |
| Shaggy Trichodiadema | Direct sun (at least 4-6 hours) | When soil is completely dry, approximately every 10-14 days during winter-spring growth period; very sparingly (once monthly) in summer dormancy | Pet-safe |
| Shand's Gibbaeum | Direct sun (at least 4-6 hours) | Every 2–4 weeks during active growth (autumn and spring); withheld in summer dormancy and reduced to once monthly or less in winter | Pet-safe |
| Shark Teeth Venus flytrap | Direct sun (at least 4-6 hours) | Continuously moist via tray watering; slightly drier in winter | Pet-safe |
| Sharp-lobed Begonia | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; less in winter | Toxic to pets |
| Sharp-lobed Hepatica | Medium indirect light (a couple of metres from a window) | Every 5–7 days in spring; reduced to every 10–14 days in summer | Mildly toxic to pets |
| Sharp-petaled Schwantesia | Direct sun (at least 4-6 hours) | Every 10-14 days during autumn and winter growth; once a month in spring; none or minimal in summer | Mildly toxic to pets |
| Sharp-tipped Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep roots consistently moist | Pet-safe |
| sheep's fescue | Direct sun (at least 4-6 hours) | Very low; once established, relies on natural rainfall in temperate climates; water monthly if needed during prolonged drought | Pet-safe |
| Shield Sundew | Direct sun (at least 4-6 hours) | Tray-water during active growth (autumn–spring); completely dry in summer. | Pet-safe |
| Shining Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; very sparsely in winter | Pet-safe |
| Shining Cranesbill | Bright indirect light (just back from a sunny window) | Low; water only in prolonged drought | Pet-safe |
| Shining Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; greatly reduced to near-dry during dormancy | Mildly toxic to pets |
| Shining Sundew | Bright indirect light (just back from a sunny window) | Tray method — keep 1 cm of pure water at all times | Pet-safe |
| Short-Horned Sundew | Bright indirect light (just back from a sunny window) | Constantly moist — tray method year-round | Mildly 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 |
| Short-Sepalled Lewisia | Direct sun (at least 4-6 hours) | Moderate in spring; bone-dry in summer dormancy | Mildly toxic to pets |
| Short-stalk Sophronitis | Bright indirect light (just back from a sunny window) | When the bark surface dries, roughly every 5-7 days in summer; every 10-14 days in winter | Pet-safe |
| Short-stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in winter | Mildly toxic to pets |
| Short-Stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in active growth; less in hot summer months | Pet-safe |
| Short-stemmed Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; medium kept evenly moist | Pet-safe |
| Showy 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 Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; once every 2–4 weeks during dry rest | Pet-safe |
| Showy Sinningia | Bright indirect light (just back from a sunny window) | Keep soil slightly moist during growth; dry off in autumn | Pet-safe |
| Shrubby Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer through early spring; completely dry in June–August | Pet-safe |
| Siberian Mountain Heath | Bright indirect light (just back from a sunny window) | Water regularly to keep soil evenly and consistently moist; never allow to dry out. | Mildly toxic to pets |
| Sibthorp's Everlasting | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; sparingly in winter | Mildly toxic to pets |
| Sieber's Crocus | Direct sun (at least 4-6 hours) | Low — water at planting, then rely on rainfall during active growth; keep dry in summer dormancy | Mildly toxic to pets |
| Sieber's Crocus | Direct sun (at least 4-6 hours) | Rainfall typically sufficient; supplement with light watering weekly only during prolonged dry spells in the growing season | Mildly toxic to pets |
| Sierra Cliff Brake Fern | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 10-21 days depending on season and environment | Pet-safe |
| Signet marigold | Direct sun (at least 4-6 hours) | Once or twice weekly; allow top 2 cm of soil to dry between waterings | Mildly toxic to pets |
| Signet Marigold 'Lemon Gem' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, every 4-7 days; containers more often | Mildly toxic to pets |
| Silky Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 10–14 days in growth; very sparingly in winter | Pet-safe |
| Silver Air Plant | Bright indirect light (just back from a sunny window) | Soak for 20–30 minutes twice a week; mist 2–3 times weekly | Pet-safe |
| Silver Ball Cactus | Bright indirect light (just back from a sunny window) | When the top of the mix is dry, roughly every 7-10 days in summer; none in winter | Pet-safe |
| Silver Ball Cactus | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, every 10-14 days in summer; every 4-6 weeks in autumn; once monthly or less in winter | Pet-safe |
| Silver Ball Notocactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; once a month or less in winter | Pet-safe |
| Silver Ball Notocactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 10-14 days in summer; sparingly once every 4-6 weeks in winter | Pet-safe |
| Silver Cluster Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in growth; withhold in winter | Pet-safe |
| Silver Shamrock | Direct sun (at least 4-6 hours) | Water sparingly; allow to dry between waterings | Toxic to pets |
| Silver Star Bromeliad | Bright indirect light (just back from a sunny window) | Every 7–10 days | Pet-safe |
| Silver Star Bromeliad | Medium indirect light (a couple of metres from a window) | Water when the top 1-2 cm of compost is dry, roughly every 5-7 days | Pet-safe |
| 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-edged Primrose | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce in summer dormancy | Mildly toxic to pets |
| Silver-leaf Sinningia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; water very sparingly or not at all during dormancy | Pet-safe |
| 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 Stelis | Medium indirect light (a couple of metres from a window) | Every 1–2 days; keep medium consistently moist | Pet-safe |
| Simple-leaf astilbe | Medium indirect light (a couple of metres from a window) | Consistently moist — water 2–3 times per week in dry spells | Pet-safe |
| Simpson's Juttadinteria | Direct sun (at least 4-6 hours) | Every 2–3 days in the active season (autumn and spring); very sparingly in summer | Mildly toxic to pets |
| Simulated Air Plant | Bright indirect light (just back from a sunny window) | Weekly soak of 20–30 minutes | Pet-safe |
| Single-Flowered Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate permanently moist to wet throughout the growing season; reduce to just damp in cooler winter months | Mildly 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 |
| Single-leaf Cape Primrose | Bright indirect light (just back from a sunny window) | every 7–10 days in the growing season, reduce to every 14–21 days in winter | Pet-safe |
| Sinningia 'Duchess of York' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Sinningia 'Empress' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, keeping the mix evenly moist during active growth | Pet-safe |
| Sinningia 'Li'l Georgie' | Bright indirect light (just back from a sunny window) | When the top 1 cm of soil is dry, about every 4-7 days | Pet-safe |
| Sinningia 'Prudence Risley' | 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 | Pet-safe |
| Sinningia concinna | Bright indirect light (just back from a sunny window) | Keep evenly lightly moist while in growth, watering when the surface just dries, roughly every 5-8 days | Pet-safe |
| Sinningia eumorpha | 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 | Pet-safe |
| Siskiyou Lewisia | Bright indirect light (just back from a sunny window) | Regular in spring/summer; very sparing in winter | Mildly toxic to pets |
| Sky Plant | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly, or mist several times a week; more often in dry, warm rooms | Pet-safe |
| Slack's Sundew | Direct sun (at least 4-6 hours) | Tray-water continuously during active growth; allow tray to dry slightly during the mild winter rest (does not have a hard dormancy). | Pet-safe |
| Slanted Air Plant | Medium indirect light (a couple of metres from a window) | Mist 3–4 times per week; soak in cool water for 15–20 minutes every 5–7 days. | Pet-safe |
| Slender Anubias | Low light (north window or shaded room) | Submerged aquatic — 20-30% weekly water changes recommended. | Toxic to pets |
| Slender Aubrieta | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Mildly toxic to pets |
| Slender Frailea | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Slender Iceplant | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry completely between waterings | Pet-safe |
| Slender Sonerila | Medium indirect light (a couple of metres from a window) | Every 5–7 days; maintain consistent moisture without saturation | Pet-safe |
| Slender-Leaved Sundew | Direct sun (at least 4-6 hours) | Keep substrate consistently moist via a shallow tray; refresh water every few days | Pet-safe |
| Slender-lined Living Stones | Direct sun (at least 4-6 hours) | Very infrequent — one or two waterings during the autumn growth window (September–November); completely dry for 7–8 months of the year | Pet-safe |
| Slender-stalked Billbergia | Bright indirect light (just back from a sunny window) | Every 7–14 days | Pet-safe |
| Slim-leaved Biarum | Direct sun (at least 4-6 hours) | Water sparingly in autumn and winter; keep completely dry from late spring through summer dormancy | Toxic to pets |
| Slipper Gastrochilus | Bright indirect light (just back from a sunny window) | Mount: daily misting; pot: every 3-4 days during growth, every 7-10 days in winter | Pet-safe |
| Small Cape Primrose | Medium indirect light (a couple of metres from a window) | every 7–10 days in the growing season, every 14–21 days in winter | Pet-safe |
| 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-flowered Cape Primrose | Medium indirect light (a couple of metres from a window) | Every 7-10 days in active growth; every 3 weeks in winter | Pet-safe |
| Small-Flowered Cranesbill | Bright indirect light (just back from a sunny window) | Low; water sparingly and only in drought | Pet-safe |
| Small-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–5 weeks in winter | Pet-safe |
| Small-scaled Pink | Direct sun (at least 4-6 hours) | Low to moderate; allow soil to approach dryness between waterings | Mildly toxic to pets |
| Smelly Dorstenia | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 3–4 weeks in winter | Mildly 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 |
| Snapdragon Achimenes | Bright indirect light (just back from a sunny window) | Keep evenly moist during the growing season (spring–autumn); withhold entirely during winter dormancy | Pet-safe |
| Sneed's Pincushion | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 14-21 days in the growing season; almost none in winter | Pet-safe |
| Snow Crystals Sweet Alyssum | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil feels dry, roughly every 5-7 days in warm weather | Pet-safe |
| Snow Trillium | Medium indirect light (a couple of metres from a window) | Moderate during spring growth; dry summer dormancy | Mildly toxic to pets |
| Snow-in-Summer | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Pet-safe |
| Snow-white Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of the mix is dry, approximately every 5-7 days | Mildly toxic to pets |
| Snowball Pincushion | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep dry through winter | Pet-safe |
| Snowcap Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Social Air Plant | Bright indirect light (just back from a sunny window) | Soak twice weekly or mist daily | Pet-safe |
| 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 |
| Sodiros Monopyle | Low light (north window or shaded room) | Every 4–6 days; keep substrate evenly moist | Pet-safe |
| Soft Draba | Direct sun (at least 4-6 hours) | Very low — keep almost dry in winter | Mildly toxic to pets |
| Soft-leaf Dunce Cap | Bright indirect light (just back from a sunny window) | Approximately every 12–14 days in the growing season; very sparingly in winter dormancy | Pet-safe |
| soft-leaf primulina | Medium indirect light (a couple of metres from a window) | Every 7–12 days in spring–summer; every 14–21 days in winter | Pet-safe |
| 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 |
| Sonerila heterostemon | Bright indirect light (just back from a sunny window) | Keep consistently moist in the growing season, watering as the surface starts to dry, about every 4-6 days | Mildly toxic to pets |
| Sooty Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce to every 10–14 days in winter | Pet-safe |
| Sophronitis coccinea | Bright indirect light (just back from a sunny window) | Every 2-4 days; keep evenly moist year-round | Pet-safe |
| Sorbet XP Mix Viola | Bright indirect light (just back from a sunny window) | When the top 1–2 cm of soil begins to dry, roughly every 4–6 days | Mildly toxic to pets |
| Spanish Bluebell | Medium indirect light (a couple of metres from a window) | Low to moderate; largely self-sufficient once established | Toxic to pets |
| Spanish Draba | Direct sun (at least 4-6 hours) | Water sparingly; allow soil to dry between waterings | Pet-safe |
| Spanish Houseleek | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month in winter | Pet-safe |
| Spanish Stonecrop | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in very dry spells | Pet-safe |
| Spartan Cliff Stonecrop | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; monthly or less in autumn/winter | Mildly toxic to pets |
| Spatulate Dendrobium | Bright indirect light (just back from a sunny window) | Regularly through warm growth; reduced over a cool, brighter winter rest | Pet-safe |
| Spegazzini's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 10-14 days in summer; every 4-6 weeks in winter | Pet-safe |
| Spider Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| Spider Iris | Direct sun (at least 4-6 hours) | Moderate in winter growing season; bone dry in summer dormancy | Toxic to pets |
| Spike Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season; sparingly in winter (once a month or less) | Pet-safe |
| Spike Moss | Low light (north window or shaded room) | Keep the soil consistently moist; water every 3-5 days or whenever the surface begins to dry | Pet-safe |
| Spiked Pleurothallis | Medium indirect light (a couple of metres from a window) | Daily in summer; every 2–3 days in winter | Pet-safe |
| Spinulose Lady Fern | Low light (north window or shaded room) | 2–3 times per week; keep consistently moist year-round | Pet-safe |
| Spiny Germander | Direct sun (at least 4-6 hours) | Very infrequently once established; water lightly only during extreme summer drought | Mildly toxic to pets |
| Spiny Orostachys | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; almost none in winter dormancy | Pet-safe |
| Spiny Racinaea | Bright indirect light (just back from a sunny window) | Mist 3-5 times per week or soak in water for 20-30 minutes 1-2 times per week | Pet-safe |
| Spiny Ruschia | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Spinystar Cactus | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 10-14 days in summer; almost none from October to March | Pet-safe |
| Spiral Corkscrew Plant | Bright indirect light (just back from a sunny window) | Keep the substrate permanently moist using the tray method with 1-2 cm of distilled water; never allow to dry out | Pet-safe |
| Splash Polka Dot Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce slightly in winter | Pet-safe |
| Split Rock | Direct sun (at least 4-6 hours) | Soak-and-dry, only when fully dry — roughly every 2-3 weeks in active growth; little to none in summer and winter | Pet-safe |
| Spoon-leaved Aloinopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks from autumn through early spring; minimal or none June–August | Pet-safe |
| Spoon-leaved Sundew | Direct sun (at least 4-6 hours) | Keep constantly wet; stand in 1-2 cm of water year-round | Mildly toxic to pets |
| Spotted Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; once monthly or less in winter | Mildly toxic to pets |
| Spotted Neoregelia | Bright indirect light (just back from a sunny window) | Keep the central cup filled; allow potting medium to dry slightly between waterings | Pet-safe |
| Spotted Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; withhold almost entirely during dormancy | Mildly toxic to pets |
| Spotted Trillium | Medium indirect light (a couple of metres from a window) | Regular during active growth; minimal when dormant | Mildly toxic to pets |
| Spotted-foot Stelis | Medium indirect light (a couple of metres from a window) | Every 1–2 days (mounted) or 2–3 times per week (potted) | Pet-safe |
| Spreading Achimenes | Bright indirect light (just back from a sunny window) | Evenly moist during the growing season; completely dry during winter rhizome dormancy | Pet-safe |
| Spreading Selaginella | Low light (north window or shaded room) | Keep evenly moist; water every 3-5 days ensuring the soil never dries out | Pet-safe |
| Spreading Spike Moss | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; check every 2-3 days | Pet-safe |
| Sprengel's Air Plant | Bright indirect light (just back from a sunny window) | Soak weekly; mist 2–3 times per week | Pet-safe |
| Spring Beauty | Medium indirect light (a couple of metres from a window) | Moderate during active growth (February–May); none needed during summer dormancy. | Pet-safe |
| Spring Cinquefoil (Potentilla tabernaemontani) | Direct sun (at least 4-6 hours) | Rarely; drought-tolerant once established | Pet-safe |
| 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 Gentian | Direct sun (at least 4-6 hours) | Regular; keep soil evenly moist, never waterlogged | Mildly 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 |
| Spring Symphony Foamflower | Medium indirect light (a couple of metres from a window) | Approximately every 5–7 days; more frequently in heat or drought | Pet-safe |
| Squinancywort | Direct sun (at least 4-6 hours) | Rarely — only during prolonged drought | Mildly 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 |
| Squirrel's Foot Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of the potting medium feels dry, roughly every 7-10 days in summer | Pet-safe |
| Stapelia flavopurpurea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Pet-safe |
| Stapelia grandiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia hirsuta | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia hirsuta var. vetula | Bright indirect light (just back from a sunny window) | When the soil has dried out, roughly every 1-2 weeks in warm growth | Mildly toxic to pets |
| Stapelia leendertziae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Pet-safe |
| Stapelia variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| 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 Cactus | Direct sun (at least 4-6 hours) | Every 2-4 weeks in spring/summer; roughly monthly or less in winter | Pet-safe |
| Star Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Star Frailea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is completely dry, roughly every 10-14 days in summer | Pet-safe |
| 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 |
| Star Window Plant | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Pet-safe |
| Starfish Sansevieria | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks (longer in winter) | Toxic to pets |
| Starflower | Medium indirect light (a couple of metres from a window) | Regular; keep soil consistently moist throughout the growing season (spring through autumn). | Pet-safe |
| Staurogyne repens | Bright indirect light (just back from a sunny window) | Fully submerged; 25-50% water change weekly | Mildly toxic to pets |
| Steinmann's Rebutia | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 14–21 days in spring and autumn; very little or none in winter | Pet-safe |
| Stemless Gentian | Bright indirect light (just back from a sunny window) | Regular, keeping soil evenly moist throughout the growing season | Mildly toxic to pets |
| Stemless Thistle | Direct sun (at least 4-6 hours) | Very low — fully drought tolerant | Mildly toxic to pets |
| Stenocactus crispatus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; keep dry in winter | Pet-safe |
| Stenocactus Multicostatus | Bright indirect light (just back from a sunny window) | When the mix is fully dry, about every 1-2 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Stephan's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late August through November (active growth); withheld completely from May to late August | Pet-safe |
| Sticky Primrose | Bright indirect light (just back from a sunny window) | Regularly in spring and summer; minimal in winter | Toxic to pets |
| Stinking Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist to damp through the growing season; reduce after summer dormancy | Mildly toxic to pets |
| Stoloniferous Sundew | Bright indirect light (just back from a sunny window) | Tray method during winter growing season; completely dry during summer dormancy | Mildly toxic to pets |
| Stomandra Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7–10 days; keep compost lightly and evenly moist | Pet-safe |
| Stone Mimicry Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn and spring; almost none in summer (June–August in the Northern Hemisphere) | Mildly toxic to pets |
| Stonecrop Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Pet-safe |
| Stonecrop-leaf Aichryson | Bright indirect light (just back from a sunny window) | Every 10–14 days in the active growing season (autumn to spring); once a month or less in summer | Pet-safe |
| straight-leaved butterwort | Bright indirect light (just back from a sunny window) | Water when top of mix feels barely dry (summer); reduce to very occasional misting (winter) | Pet-safe |
| Strap Water Fern | Low light (north window or shaded room) | Keep soil consistently moist; water every 3-5 days in summer and reduce slightly in winter | Pet-safe |
| Strap-leaf Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 2–3 days in active growth; reduce slightly during winter dormancy | Pet-safe |
| Stratiotes aloides | Direct sun (at least 4-6 hours) | Submerged to surface-floating; keep in still water 0.3-1.5 m deep | Mildly toxic to pets |
| Strawberry Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Streptocarpus 'Black Panther' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Chorus Line' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Falling Stars' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Harlequin Blue' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Pet-safe |
| Streptocarpus 'Polka-Dot Purple' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Purple Haze' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, about every 7-10 days | Pet-safe |
| Stribrny's Saxifrage | Direct sun (at least 4-6 hours) | Water sparingly; keep almost dry in winter | Mildly toxic to pets |
| Striped Nananthus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in summer | Mildly toxic to pets |
| Striped Squill | Bright indirect light (just back from a sunny window) | Regular during growth; dry when dormant | Mildly toxic to pets |
| Striped Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in winter (growing season); suspend almost entirely in summer | Toxic to pets |
| Strobel's Masdevallia | Medium indirect light (a couple of metres from a window) | Every 1–2 days; keep substrate evenly moist throughout the year | Pet-safe |
| Strobel's Masdevallia | Medium indirect light (a couple of metres from a window) | Water freely when the medium begins to approach dryness, roughly every 1-2 days in summer | Pet-safe |
| Sublime Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the top of the mix is just barely drying, roughly every 5-7 days | Mildly toxic to pets |
| Sukhakul's Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the surface of the mix starts to dry, roughly every 5-7 days | Pet-safe |
| Sulcorebutia rauschii | Direct sun (at least 4-6 hours) | When fully dry in summer, roughly every 12-14 days; keep dry in winter | Pet-safe |
| Sulcorebutia steinbachii | Direct sun (at least 4-6 hours) | When fully dry in summer, roughly every 10-14 days; none in winter | Pet-safe |
| Sulphur Clover | Bright indirect light (just back from a sunny window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Sulphur-Yellow Dyckia | Direct sun (at least 4-6 hours) | Only when the mix is completely dry, roughly every 14-21 days in summer; every 30-45 days in winter | Mildly toxic to pets |
| Sun Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season; nearly dry in winter | Pet-safe |
| Sun Cup Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; monthly or less in autumn and winter | Pet-safe |
| Sun Pitcher | Bright indirect light (just back from a sunny window) | Keep constantly moist; water from above or stand in a shallow tray of pure water | Mildly toxic to pets |
| Sun Pitcher (Heliamphora) | Bright indirect light (just back from a sunny window) | Keep moist year-round; tray method with no more than ~6 mm (1/4 in) standing water | Mildly toxic to pets |
| Sun Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep pitchers partially filled with distilled water; water substrate when surface begins to dry, roughly every 3-5 days in warm conditions | Pet-safe |
| Sunken Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days; never allow to dry out completely | Pet-safe |
| Sunrise Crown Cactus | Direct sun (at least 4-6 hours) | When fully dry, roughly every 12-16 days in growth; none in winter | Pet-safe |
| Sunrise Succulent | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry, roughly every 10–14 days in summer and every 3–5 weeks in winter | Mildly toxic to pets |
| Sunsatia Mango Nemesia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 4-6 days | Pet-safe |
| Sunsatia Plus Coconut Nemesia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil or compost is dry, roughly every 4-6 days | Pet-safe |
| Super Kabuto Star Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| Superb Stelis | Medium indirect light (a couple of metres from a window) | Every 2–3 days; mounted plants may need daily watering in summer | Pet-safe |
| Sutherland's Ice Plant | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is completely dry, roughly every 7-14 days in growing season; reduce to monthly in winter | Pet-safe |
| Sweet alyssum | Bright indirect light (just back from a sunny window) | Every 5–7 days; drought-tolerant once established | Pet-safe |
| Sweet Trichopilia | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of medium is dry, roughly every 5-8 days in summer; reduce to every 10-14 days in winter | Pet-safe |
| Sweet White Violet | Medium indirect light (a couple of metres from a window) | Regular; keep soil consistently moist | Pet-safe |
| Swertia-leaf Scaphosepalum | Medium indirect light (a couple of metres from a window) | When the medium surface is barely beginning to dry, roughly every 3-5 days | Pet-safe |
| Swingle's primulina | Medium indirect light (a couple of metres from a window) | Every 8–12 days in spring–summer; every 16–21 days in winter | Pet-safe |
| Swiss Rock Jasmine | Direct sun (at least 4-6 hours) | Very sparingly year-round; almost dry in winter | Pet-safe |
| Swollen-stem Tylecodon | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); once monthly or none in summer | Toxic to pets |
| Sword-Leaved Air Plant | Bright indirect light (just back from a sunny window) | Mist 2-3 times per week or soak 20 minutes weekly | Pet-safe |
| Tagetes erecta 'Inca Gold' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-4 days | Pet-safe |
| Tagetes erecta 'Taishan Orange' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-4 days | Pet-safe |
| Tagetes patula 'Boy Orange' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Tagetes patula 'Janie Bright Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Tagetes tenuifolia 'Tangerine Gem' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Tail-leaf Tolumnia | Bright indirect light (just back from a sunny window) | When roots appear silvery and the leaf base is dry, roughly every 5-7 days | Pet-safe |
| Tailed Masdevallia | Bright indirect light (just back from a sunny window) | Daily in warm weather; every 3–5 days in cooler months | Pet-safe |
| Taita African violet | Bright indirect light (just back from a sunny window) | Every 7–10 days | Pet-safe |
| Taiwan Felt Fern | Bright indirect light (just back from a sunny window) | Every 7-10 days; allow surface to dry between waterings | Pet-safe |
| Tamis Chirita | Bright indirect light (just back from a sunny window) | Every 7–10 days | Pet-safe |
| Tanquana hilmarii | Direct sun (at least 4-6 hours) | Sparing from autumn to spring; withhold in summer | Mildly toxic to pets |
| Tanquana prismatica | Direct sun (at least 4-6 hours) | Sparing in autumn-spring; near-zero in summer | Mildly toxic to pets |
| Tassel Grape Hyacinth | Direct sun (at least 4-6 hours) | Once per week during spring growth; very dry during summer dormancy | Toxic to pets |
| Tasteless Stonecrop | Bright indirect light (just back from a sunny window) | Every 14-21 days in spring and summer; monthly or less in winter | Pet-safe |
| Tavaresia barklyi | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in warm growth; keep nearly dry in winter | Mildly toxic to pets |
| Tavaresia grandiflora | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in warm growth; keep nearly dry in winter | Mildly toxic to pets |
| Tawny Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water sparingly in autumn (September–November) during active growth; keep completely dry in winter and summer | Pet-safe |
| Taxiphyllum sp. 'Flame' | Low light (north window or shaded room) | Fully submerged; 25-50% water change weekly | Mildly 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 |
| Teague's Porroglossum | Medium indirect light (a couple of metres from a window) | Every 2–4 days; allow medium surface to dry slightly between waterings | Pet-safe |
| 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 |
| Tentacle Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting or continuous humidity; never allow roots to fully dry | Pet-safe |
| Tephrocactus | Direct sun (at least 4-6 hours) | When the mix is completely dry, sparingly every 2-3 weeks in summer; keep bone-dry in winter | Mildly toxic to pets |
| Tessellated Colchicum | Direct sun (at least 4-6 hours) | Minimal; water lightly after planting, then rely on rainfall during autumn–spring growth | Toxic to pets |
| Texas Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Texas Bluebonnet Subsp. | Direct sun (at least 4-6 hours) | Low; relies on autumn and winter rainfall; no regular supplemental watering needed once established | Toxic to pets |
| Texas Nipple Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Texas Rainbow Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Pet-safe |
| Thai Silk California poppy | Direct sun (at least 4-6 hours) | Once weekly during establishment; every 2 weeks once established | Mildly 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 |
| Thelocactus bicolor | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 12-16 days in summer; none in winter | Pet-safe |
| Thelocactus hexaedrophorus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 12-16 days in summer; none in winter | Pet-safe |
| Thelocactus setispinus | Direct sun (at least 4-6 hours) | When the top of the mix dries, roughly every 7-12 days in growth; keep dry in winter | Pet-safe |
| Theresa's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Thick-leaf Primulina | Bright indirect light (just back from a sunny window) | Every 14–21 days in the growing season; every 4–5 weeks in winter | Mildly toxic to pets |
| Thimble Cactus | Direct sun (at least 4-6 hours) | When fully dry, roughly every 10-14 days in summer; keep nearly dry in winter | Pet-safe |
| Thin-Leaved Air Plant | Bright indirect light (just back from a sunny window) | 2–3 times per week | Pet-safe |
| Thin-Spiked Air Plant | Bright indirect light (just back from a sunny window) | 2–3 times per week (misting) or weekly soak | Pet-safe |
| Thorny Chin Cactus | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; every 5–8 weeks in winter | Pet-safe |
| Thorny Specklinia | Medium indirect light (a couple of metres from a window) | Every 1–2 days; do not allow complete drying | Pet-safe |
| Thread-Leaved Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week, or soak for 20–30 minutes once a week | Pet-safe |
| Three-awn Trisetella | Medium indirect light (a couple of metres from a window) | When the medium surface just begins to dry, roughly every 3-5 days | Pet-safe |
| Three-Colored Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce to every 10–14 days in winter | Pet-safe |
| Three-Coloured Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate consistently moist; water tray method year-round | Mildly toxic to pets |
| Three-Leaved Stork's Bill | Direct sun (at least 4-6 hours) | Water moderately in the growing season; keep nearly dry in winter | Mildly toxic to pets |
| Three-Nerved Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to dry between waterings) | Pet-safe |
| Three-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 |
| Thrift | Direct sun (at least 4-6 hours) | Every 7–14 days, allowing soil to dry between waterings | Pet-safe |
| Thyme-Leaved Edraianthus | Direct sun (at least 4-6 hours) | Low — allow soil to dry between waterings | Mildly toxic to pets |
| Thyme-leaved Sandwort | Direct sun (at least 4-6 hours) | Low; water sparingly, allow soil to dry between waterings | Mildly 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 Jaws | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring-autumn; roughly monthly or less in winter | Mildly toxic to pets |
| Tiger 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 Moth Orchid | Bright indirect light (just back from a sunny window) | When the bark is nearly dry, typically every 6-9 days | Pet-safe |
| 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 |
| Tiger Trichocentrum | Bright indirect light (just back from a sunny window) | When the bark approaches dryness, every 7-10 days; reduce slightly in cooler months | Pet-safe |
| Tillandsia aeranthos | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly | Pet-safe |
| Tillandsia Andreana | Bright indirect light (just back from a sunny window) | Mist 2-3 times a week and soak 20-30 minutes every 1-2 weeks, more often in dry heat | Pet-safe |
| Tillandsia Baileyi | Bright indirect light (just back from a sunny window) | Soak for 20-30 minutes weekly, with extra misting in dry or hot spells | Pet-safe |
| Tillandsia bergeri | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly; mist between soaks in dry air | Pet-safe |
| Tillandsia brachycaulos | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly | Pet-safe |
| Tillandsia bulbosa | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly, plus misting between soaks in dry air | Pet-safe |
| Tillandsia butzii | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly; mist between soaks if dry | Pet-safe |
| Tillandsia Capitata | Bright indirect light (just back from a sunny window) | Soak fully every 7-10 days, plus mist 2-3 times weekly in dry or warm conditions | Pet-safe |
| Tillandsia caput-medusae | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes every 1-2 weeks; mist between soaks | Pet-safe |
| Tillandsia Concolor | Bright indirect light (just back from a sunny window) | Soak fully every 7-10 days, plus mist 1-2 times weekly in dry air | Pet-safe |
| Tillandsia fuchsii | Bright indirect light (just back from a sunny window) | Mist 2-3 times weekly or soak 20-30 minutes weekly | Pet-safe |
| Tillandsia Gardneri | Bright indirect light (just back from a sunny window) | Mist thoroughly 3-4 times a week; brief 10-15 minute soaks every 1-2 weeks | Pet-safe |
| Tillandsia ionantha 'Druid' | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly, with misting between soaks in dry rooms | Pet-safe |
| Tillandsia ionantha 'Fuego' | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly, plus misting between soaks in dry rooms | Pet-safe |
| Tillandsia juncea | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly | Pet-safe |
| Tillandsia leiboldiana | Bright indirect light (just back from a sunny window) | Keep the central cup filled; soak or rinse weekly | Pet-safe |
| Tillandsia magnusiana | Bright indirect light (just back from a sunny window) | Mist 2-3 times a week, or briefly dunk every 1-2 weeks | Pet-safe |
| Tillandsia paleacea | Bright indirect light (just back from a sunny window) | Mist 2-3 times a week, or soak briefly every 1-2 weeks | Pet-safe |
| Tillandsia Pruinosa | Bright indirect light (just back from a sunny window) | Mist or dunk 2-4 times weekly; soak briefly every 1-2 weeks | Pet-safe |
| Tillandsia pseudobaileyi | Bright indirect light (just back from a sunny window) | Soak or dunk every 7-10 days | Pet-safe |
| Tillandsia recurvifolia | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly; mist between soaks if air is dry | Pet-safe |
| Tillandsia schiedeana | Bright indirect light (just back from a sunny window) | Soak or dunk every 7-10 days, or mist 2-3 times weekly | Pet-safe |
| Tillandsia Seleriana | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes every 1-2 weeks; mist only lightly between soaks | Pet-safe |
| Tillandsia Streptophylla | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes every 1-2 weeks; mist sparingly between soaks | Pet-safe |
| Tillandsia stricta | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly, plus misting between soaks in dry rooms | Pet-safe |
| Tillandsia tectorum | Bright indirect light (just back from a sunny window) | Mist lightly every 10-14 days; soak only rarely | Pet-safe |
| Tillandsia tricolor | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes once a week, or mist 2-3 times weekly | Pet-safe |
| Tillandsia Velutina | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly, misting more often in warm, dry conditions | Pet-safe |
| Tina butterwort | Bright indirect light (just back from a sunny window) | Keep media lightly damp during carnivorous phase; allow to nearly dry during succulent winter phase | Pet-safe |
| Tiny Dunce Cap | Direct sun (at least 4-6 hours) | Every 1–2 weeks during active growth; very sparingly in winter dormancy | Pet-safe |
| Tiny Sea Lavender | Direct sun (at least 4-6 hours) | Low — water sparingly, allowing soil to dry completely between sessions | Pet-safe |
| Tiny Stelis | Medium indirect light (a couple of metres from a window) | Every 1–2 days; medium should not dry out completely | Pet-safe |
| Tiny Sun Mammillaria | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and once every 6 weeks in winter | Pet-safe |
| Tiny Sundew | Direct sun (at least 4-6 hours) | Shallow water tray in winter–spring; dry rest in summer | Mildly toxic to pets |
| Tiraque Sulcorebutia | Direct sun (at least 4-6 hours) | Every 10-14 days in active growth; once a month or less from October to February | Pet-safe |
| Titanopsis Hugo-Schlechteri | Direct sun (at least 4-6 hours) | Mainly in autumn through spring, every 2-3 weeks when the soil is fully dry; sparing in hot summer | Mildly toxic to pets |
| Titanopsis primosii | Direct sun (at least 4-6 hours) | In autumn-spring growth once soil is fully dry; withhold through summer dormancy | Mildly toxic to pets |
| Titanopsis schwantesii | Direct sun (at least 4-6 hours) | During autumn-spring growth when soil is fully dry; near-zero in summer | Mildly toxic to pets |
| Toadshade Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist during spring and summer growing season; allow soil to dry slightly after summer dormancy. | Mildly toxic to pets |
| Tolumnia variegata | Bright indirect light (just back from a sunny window) | Daily to every other day when mounted; allow to dry fully between | Pet-safe |
| Tom Thumb Cactus | Bright indirect light (just back from a sunny window) | Every 10-14 days in spring/summer; every 3-4 weeks in autumn; once or twice in winter | Mildly toxic to pets |
| Tom Thumb Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, about every 7-10 days in summer; minimal in winter | Pet-safe |
| Tommies Crocus | Bright indirect light (just back from a sunny window) | No supplemental watering needed once established; relies on winter and spring rainfall | Mildly toxic to pets |
| Tongue Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of medium is dry, roughly every 7-10 days | Pet-safe |
| Tongue Leaf Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn and spring; very sparingly in summer and winter | Mildly toxic to pets |
| 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 |
| Toothwort | Medium indirect light (a couple of metres from a window) | 2–3 times per week during the brief spring growth period; essentially none during summer dormancy | Pet-safe |
| Top-shaped Living Stones | Direct sun (at least 4-6 hours) | Every 3–4 weeks in autumn; none in summer or winter | Pet-safe |
| Topsy Turvy Echeveria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Tormentil | Bright indirect light (just back from a sunny window) | Moderate; keep soil lightly moist but not wet | Pet-safe |
| Transparent-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to dry between waterings) | Pet-safe |
| Transylvanian Hepatica | Medium indirect light (a couple of metres from a window) | Every 5–7 days in spring and autumn; every 10–14 days in summer | Mildly toxic to pets |
| Transylvanian Pink | Direct sun (at least 4-6 hours) | Infrequent; allow soil to dry well between waterings | Mildly toxic to pets |
| Treasure flower | Direct sun (at least 4-6 hours) | Every 10–14 days once established; weekly when young | Mildly toxic to pets |
| Triangular Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in spring and autumn | Pet-safe |
| Tricolor Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate saturated or in a shallow tray of 1–3 cm of water at all times | Pet-safe |
| Trim Greenhood | Medium indirect light (a couple of metres from a window) | Lightly moist during active growth (autumn–spring), roughly every 5-7 days | Pet-safe |
| Tropical Dewy Pine | Direct sun (at least 4-6 hours) | Keep medium wet to moist at all times; tray method with 1–2 cm water | Pet-safe |
| Tropical Sundew | Bright indirect light (just back from a sunny window) | Keep tray permanently wet | Pet-safe |
| Trumpet Gentian | Direct sun (at least 4-6 hours) | Regular during the growing season; reduced but not eliminated in winter | Mildly toxic to pets |
| Truncate Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Tsusima Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, roughly every 5-7 days | Pet-safe |
| Tuberous Cranesbill | Direct sun (at least 4-6 hours) | Sparingly in summer; moderate in spring growing season | Mildly toxic to pets |
| Tuerckheim's Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days in summer; every 3–5 days in cooler months | Pet-safe |
| 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 '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 '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 'Tulipa clusiana' | Direct sun (at least 4-6 hours) | Rainfall in spring; keep dry during summer dormancy | Toxic to pets |
| Tulista Marginata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 2-3 weeks in growth; monthly in winter | Pet-safe |
| Tulista Pumila | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-3 weeks in growth; monthly in winter | Pet-safe |
| Tunbridge Filmy Fern | Low light (north window or shaded room) | Continuously moist — never allow fronds to dry; mist 2–3 times daily or maintain in an enclosed humid environment | Mildly toxic to pets |
| Tuolumne Fawn Lily | Medium indirect light (a couple of metres from a window) | Consistently moist during growth (late winter to early summer); do not allow to dry out even during dormancy | Mildly toxic to pets |
| Turbinicarpus pseudomacrochele | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2 weeks; none in winter | Pet-safe |
| Turbinicarpus schmiedickeanus | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; none in winter | Pet-safe |
| Turbinicarpus valdezianus | Direct sun (at least 4-6 hours) | Very sparingly when fully dry in the growing season, roughly every 2-3 weeks; none in winter | Pet-safe |
| Turbo Peperomia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in terrariums; every 10–14 days in open pots | Pet-safe |
| Turk's Cap Cactus | Bright indirect light (just back from a sunny window) | When the mix is fully dry, about every 1-2 weeks in summer; sparse in winter | Mildly toxic to pets |
| Turkestan Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; sparingly in autumn; almost none in winter | Pet-safe |
| Turkestan Tulip | Direct sun (at least 4-6 hours) | Minimal; water once at planting; rely on natural rainfall during growth; completely dry during summer dormancy | Toxic to pets |
| Turkish Catmint | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; very sparingly in winter | Pet-safe |
| Turkish Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Pet-safe |
| Tweedy's Lewisia | Bright indirect light (just back from a sunny window) | Regular in spring; near-dry from midsummer to early autumn | Pet-safe |
| Twiggy Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting; substrate must stay consistently moist | Pet-safe |
| Twin-Flowered Air Plant | Bright indirect light (just back from a sunny window) | Mist 2–3 times per week, or a 20-minute soak once a week | Pet-safe |
| Twin-flowered Ruschia | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in the growing season; very sparingly (once every 3-4 weeks) in winter | Pet-safe |
| Twinkle Oncidium | Bright indirect light (just back from a sunny window) | When the top of the mix begins to dry, about every 4-6 days | Pet-safe |
| Twisted Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; monthly in winter | Mildly toxic to pets |
| Twisted Air Plant | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly; mist 2-3 times per week | Pet-safe |
| Twisted Racinaea | Bright indirect light (just back from a sunny window) | Mist or drench 3-4 times per week; central cup kept lightly moist | Pet-safe |
| Twisted Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; maintain light but consistent moisture | Pet-safe |
| Twisted Trichopilia | Medium indirect light (a couple of metres from a window) | Water when the medium is nearly dry at the surface, roughly every 5-8 days in active growth; reduce to every 10-14 days in cooler months during rest | Pet-safe |
| Twisted Trillium | Medium indirect light (a couple of metres from a window) | Moderate moisture in spring; reduced in summer dormancy | Mildly toxic to pets |
| Two-colored Lacaena | Medium indirect light (a couple of metres from a window) | Water when the medium is nearly dry at the surface, roughly every 5-8 days in active growth; reduce to every 10-14 days in cooler months | Pet-safe |
| Two-edged Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days in warm months; every 2–3 days in winter | Pet-safe |
| Two-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-Lobed Cone Plant | Direct sun (at least 4-6 hours) | Strictly seasonal: water sparingly from September to March (active growth and flowering); completely dry from April/May through August | Mildly 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 |
| 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 |
| Unarmed Hedgehog Cactus | Direct sun (at least 4-6 hours) | When soil is completely dry, every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Unequal-Leaf Gibbaeum | Bright indirect light (just back from a sunny window) | Sparingly in winter (active season); essentially zero in summer (June–September dormancy) | Pet-safe |
| Unequal-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10-14 days in the growing season; less in winter | Pet-safe |
| Unequal-leaf Primulina | Bright indirect light (just back from a sunny window) | Every 10–14 days during active growth; every 3–4 weeks in winter | Mildly toxic to pets |
| Urmia Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| Utricularia alpina | Bright indirect light (just back from a sunny window) | Keep the mix moist to wet year-round, with a short drier rest possible | Mildly toxic to pets |
| Utricularia bisquamata | Bright indirect light (just back from a sunny window) | Keep the medium constantly wet, standing in a shallow tray | Mildly toxic to pets |
| Utricularia calycifida | Bright indirect light (just back from a sunny window) | Keep constantly wet by tray-standing year-round | Mildly toxic to pets |
| Utricularia livida | Bright indirect light (just back from a sunny window) | Keep constantly wet by tray-standing year-round | Mildly toxic to pets |
| Utricularia longifolia | Bright indirect light (just back from a sunny window) | Keep permanently wet via tray-standing year-round | Mildly toxic to pets |
| Utricularia sandersonii | Bright indirect light (just back from a sunny window) | Keep the media constantly wet, standing in 1-2 cm of water | Mildly toxic to pets |
| Utricularia subulata | Direct sun (at least 4-6 hours) | Keep constantly wet to waterlogged; stand in 1-2 cm of water at all times | Mildly toxic to pets |
| Valdez's Aztec Cactus | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 14-28 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Vallisneria-Leaved Butterwort | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet during the growing season (spring–autumn); reduce to near-dry during winter hibernaculum phase | Mildly toxic to pets |
| Vandeleur's Cape Primrose | Bright indirect light (just back from a sunny window) | Every 10–14 days; allow compost to dry slightly between waterings | Pet-safe |
| Vandell's Rock Jasmine | Direct sun (at least 4-6 hours) | Very low — water from below, keep dry in winter | Mildly toxic to pets |
| Variable Air Plant | Bright indirect light (just back from a sunny window) | Soak 30 minutes once or twice weekly; mist 2-3 times per week | Pet-safe |
| Variable Epidendrum | Bright indirect light (just back from a sunny window) | Every 4–7 days during growth; every 10–12 days in cooler months | Pet-safe |
| Variable-Hair Chirita | Bright indirect light (just back from a sunny window) | Every 7–10 days | Pet-safe |
| Variable-Leaved Butterwort | Bright indirect light (just back from a sunny window) | Tray-water in summer; bone-dry in winter bulb dormancy | Mildly 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 Carrion Flower | Bright indirect light (just back from a sunny window) | Every 14–21 days in summer; very sparingly (once monthly or less) in winter | Pet-safe |
| Variegated Japanese Spurge | Medium indirect light (a couple of metres from a window) | Every 5–7 days during establishment; once established, water during dry spells | Mildly toxic to pets |
| Variegated Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days from late autumn through spring when leaves are present; withhold completely in summer dormancy | Pet-safe |
| Variegated Moon Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth; minimal in winter | Pet-safe |
| Variegated Xylobium | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm of the potting medium is dry, roughly every 5-8 days in active growth; reduce to every 10-14 days in cooler months | Pet-safe |
| 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 |
| Varnished Air Plant | Bright indirect light (just back from a sunny window) | Weekly soak | Pet-safe |
| Velick's Air Plant | Bright indirect light (just back from a sunny window) | Weekly soak | Pet-safe |
| Venus Flytrap | Direct sun (at least 4-6 hours) | Keep the medium permanently wet — stand the pot in 1-2 cm of rain or distilled water and top up so it never dries | Pet-safe |
| Venus Flytrap 'Dente' | Direct sun (at least 4-6 hours) | Keep the soil constantly wet; top up the tray as it dries, near-daily in summer | Pet-safe |
| Verity's Liveforever | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (October–April); completely dry June–September | Pet-safe |
| Verschaffelt's Peperomia | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; every 14–21 days in winter | Pet-safe |
| Villete's Living Stone | Direct sun (at least 4-6 hours) | Only when the plant's old leaf pair is fully shrivelled, roughly every 3–4 weeks during the autumn–winter growing period; none in summer dormancy | Pet-safe |
| Villete's Living Stones | Direct sun (at least 4-6 hours) | Every 3–5 weeks in autumn; none in summer or winter | Pet-safe |
| Viola 'Sorbet Raspberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 3-5 days; containers more often | Pet-safe |
| Viola × wittrockiana 'Delta Pure Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, typically every 3-5 days; containers dry faster | Pet-safe |
| Viola cornuta 'Etain' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, generally every 3-5 days; more in containers and heat | Pet-safe |
| Violet Corkscrew Plant | Bright indirect light (just back from a sunny window) | Keep substrate constantly moist to wet; shallow tray method recommended | Mildly toxic to pets |
| Virgin Bladderwort | Bright indirect light (just back from a sunny window) | Keep substrate permanently moist; shallow tray method | Mildly toxic to pets |
| Virginia Spring Beauty | Bright indirect light (just back from a sunny window) | Moderate in spring; negligible once dormant in summer | Pet-safe |
| Virginia Stock | Bright indirect light (just back from a sunny window) | Weekly (keep soil evenly moist but not waterlogged) | Mildly toxic to pets |
| Volcanic Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Vriesea carinata | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Wagner's Air Plant | Bright indirect light (just back from a sunny window) | 2–3 times per week (misting) or weekly soak | Pet-safe |
| Waldensian Saxifrage | Direct sun (at least 4-6 hours) | Very low — allow soil to dry between waterings; withhold almost entirely in winter | Pet-safe |
| Walker's Water Trumpet | Low light (north window or shaded room) | Permanently submerged; never allow substrate to dry | Toxic to pets |
| Walking Fern | Low light (north window or shaded room) | Keep substrate evenly moist at all times; check every 3-5 days and never let it dry fully | Pet-safe |
| Wall Monanthes | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks in the growing season; every 3–4 weeks in winter | Pet-safe |
| Wall Rue | Bright indirect light (just back from a sunny window) | Rarely needs watering in the ground; water container plants only when the crevice substrate dries | Pet-safe |
| Wall-rue Spleenwort | Medium indirect light (a couple of metres from a window) | Sparingly — only when the substrate is dry to the touch | Mildly toxic to pets |
| Wallis Fescue | Direct sun (at least 4-6 hours) | Every 14–21 days when established; minimal in winter | Pet-safe |
| Waras' Parodia | Bright indirect light (just back from a sunny window) | Every 10-14 days in spring/summer; every 3-4 weeks in autumn; once in winter or withheld entirely | Mildly toxic to pets |
| Warty Gasteria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Pet-safe |
| Warty Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active autumn-to-spring growth; completely none in summer | Pet-safe |
| Warty Living Stones | Direct sun (at least 4-6 hours) | Every 3–5 weeks in autumn; none in summer or deep winter | Pet-safe |
| Warty Scaphosepalum | Medium indirect light (a couple of metres from a window) | When the surface of the medium is just barely dry, roughly every 3-5 days | Pet-safe |
| Watch Chain Plant | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; roughly monthly or less in winter | Mildly toxic to pets |
| Water Clover Fern | Bright indirect light (just back from a sunny window) | Always in standing water; top up to keep the rhizome submerged | Mildly toxic to pets |
| Water Hedge | Direct sun (at least 4-6 hours) | Fully submerged; 25-30% water change weekly | Mildly toxic to pets |
| Water Lily Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in spring and summer; every 3-4 weeks in autumn; almost none in winter | Pet-safe |
| Water Spangles | Bright indirect light (just back from a sunny window) | Permanent floating aquatic — sits on the water surface | Pet-safe |
| Watercress Fern | Medium indirect light (a couple of metres from a window) | When the surface starts to dry, roughly every 3-5 days | Mildly toxic to pets |
| Waterlily Tulip | Direct sun (at least 4-6 hours) | Rainfall-dependent during growing season; needs dry summer dormancy | Toxic to pets |
| Waterwheel Plant | Direct sun (at least 4-6 hours) | Fully submerged aquatic — water IS the growing medium | Pet-safe |
| Wavy-margin Primulina | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in autumn and winter | Mildly toxic to pets |
| 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 |
| Weasel Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; monthly or less in winter | Mildly toxic to pets |
| Weberbauer's Lepanthes | Medium indirect light (a couple of metres from a window) | Near-daily misting; substrate must not dry completely at any point | Pet-safe |
| Weeping Moss | Medium indirect light (a couple of metres from a window) | Fully submerged — permanent aquatic plant | Pet-safe |
| 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 Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks; minimal in winter | Mildly toxic to pets |
| Wendland's Bulbophyllum | Medium indirect light (a couple of metres from a window) | Regularly throughout the year; keep medium consistently moist in summer, slightly drier in winter | Pet-safe |
| Wendland's Bulbophyllum | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of the medium dries, roughly every 5-8 days | Pet-safe |
| Wendland's Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; never dry out | Pet-safe |
| Wendt's Water Trumpet | Low light (north window or shaded room) | Keep permanently submerged or in constantly saturated, waterlogged substrate | Toxic to pets |
| Wenzel's Chain Orchid | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of the potting medium feels dry, roughly every 5-7 days | Pet-safe |
| Werner's Living Stone | Direct sun (at least 4-6 hours) | Once every 3–5 weeks during the autumn–winter growing period only; completely dry through spring and summer | Pet-safe |
| Western Sundew | Direct sun (at least 4-6 hours) | Shallow tray method in winter–spring; dry in summer | Mildly toxic to pets |
| Wherry's Foamflower | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water about weekly, more in dry spells | Mildly toxic to pets |
| Wherry's Foamflower | Medium indirect light (a couple of metres from a window) | Once or twice per week in the growing season; reduce significantly in winter. | Mildly toxic to pets |
| White Anacampseros | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and monthly or less in winter | Mildly toxic to pets |
| White Dragon Mondo Grass | Medium indirect light (a couple of metres from a window) | Water when the top 2–3 cm of soil is dry, roughly every 7–10 days in the growing season | Mildly toxic to pets |
| White Egret Orchid | Bright indirect light (just back from a sunny window) | Keep consistently moist during active growth (spring–summer), roughly every 2-4 days | Pet-safe |
| White Freesia | Direct sun (at least 4-6 hours) | Moderate during active growth (autumn to spring); completely dry during summer dormancy | Pet-safe |
| White Juttadinteria | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (spring through autumn); very sparingly in winter | Mildly toxic to pets |
| White Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and autumn; once every 2–3 weeks in summer dry rest | Pet-safe |
| White Magic Flower | Bright indirect light (just back from a sunny window) | Keep evenly moist spring through autumn; withhold entirely in winter | Pet-safe |
| White Magic Grape Hyacinth | Direct sun (at least 4-6 hours) | Moderate in spring; dry from early summer through autumn | Mildly toxic to pets |
| White Marsh Marigold | Bright indirect light (just back from a sunny window) | Permanently moist to boggy; crown should sit just above water level | Mildly toxic to pets |
| White Marsh Marigold | Bright indirect light (just back from a sunny window) | Permanently moist to wet; boggy soil or shallow pondside | Mildly toxic to pets |
| White Rain Lily | Direct sun (at least 4-6 hours) | Regular moisture with periodic dry spells | Mildly 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 Tiger Jaws | Direct sun (at least 4-6 hours) | Every 14–21 days during the growing season (spring–autumn); once monthly or less in winter | Mildly toxic to pets |
| White Trout Lily | Medium indirect light (a couple of metres from a window) | Keep consistently moist while in growth (spring); reduce after dormancy | Mildly toxic to pets |
| White Young's Barrenwort | Medium indirect light (a couple of metres from a window) | Water weekly, or when the top 2 cm of soil dries, particularly during establishment; reduce frequency once settled | Mildly toxic to pets |
| White-Budded Sundew | Bright indirect light (just back from a sunny window) | Keep the tray permanently moist in the growing season; reduce in summer heat dormancy | Mildly toxic to pets |
| White-Flowered Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once a month or less from October to February | Pet-safe |
| White-haired Crown Cactus | Direct sun (at least 4-6 hours) | Weekly in summer; every 10–14 days in spring and autumn; once a month or none in winter | Pet-safe |
| White-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; reduce to monthly or less in winter | Pet-safe |
| White-pink Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; every 4-6 weeks or less in winter | Mildly toxic to pets |
| White-red Trichocentrum | Bright indirect light (just back from a sunny window) | When bark is nearly dry, every 6-9 days in growth; every 10-14 days in cooler, lower-light months | Pet-safe |
| White-Spined Thelocactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; suspend almost entirely in winter. | Pet-safe |
| Whitley's Speedwell | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; minimal in winter | Pet-safe |
| Wide Eye Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn to late winter; none in summer | Pet-safe |
| Wide-leaved Grape Hyacinth | Bright indirect light (just back from a sunny window) | Every 7–10 days in spring; dry over summer | Mildly toxic to pets |
| Wild Gazania | Direct sun (at least 4-6 hours) | Every 10–14 days (very drought-tolerant once established) | Mildly toxic to pets |
| Wild pansy | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil evenly moist but not wet | Pet-safe |
| Wild's Pincushion | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once every 3-4 weeks in winter | Pet-safe |
| Wilman's Ebracteola | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days during the spring-autumn growing season; very sparingly (once every 4-6 weeks) in winter | Pet-safe |
| Wilmot's Dinteranthus | Direct sun (at least 4-6 hours) | Autumn only (2 watering cycles); stop completely in spring while new leaves emerge; minimal in early winter | Pet-safe |
| Wilmot's Dinteranthus | Direct sun (at least 4-6 hours) | Every 3–5 weeks during autumn through early spring; completely dry June–August | Pet-safe |
| Wilson's Filmy Fern | Low light (north window or shaded room) | Continuously moist — fronds must never dry; maintain in a sealed humid enclosure with permanent moisture at the rhizomes | Mildly toxic to pets |
| Wimsett Brake Fern | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil feels dry, roughly every 7-10 days in summer | Pet-safe |
| Window Plant | Direct sun (at least 4-6 hours) | Every 3–4 weeks in spring and summer; minimal in winter | Pet-safe |
| Wine Cups Babiana | Direct sun (at least 4-6 hours) | Water during active growth (autumn to spring); cease completely once foliage yellows | Mildly toxic to pets |
| Winged Kacip Fatimah | Low light (north window or shaded room) | Water when the top 1–2 cm of medium begins to dry; approximately every 4–7 days depending on temperature and humidity | Mildly toxic to pets |
| Winged Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to dry almost fully between waterings) | Pet-safe |
| Winter Aconite | Medium indirect light (a couple of metres from a window) | Relies on natural rainfall; keep soil moist during active growth | Toxic to pets |
| 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 |
| Witteberg Cone Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn–winter; almost none in summer | Pet-safe |
| Wittig's Sophronitis | Bright indirect light (just back from a sunny window) | When the growing medium surface approaches dryness, roughly every 6-9 days | Pet-safe |
| 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 Forget-me-not | Medium indirect light (a couple of metres from a window) | Moderate; keep soil moist but well-drained | Pet-safe |
| Woodsia ilvensis | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days | Mildly toxic to pets |
| Woodsia obtusa | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days | Mildly toxic to pets |
| Woolly Lip Fern | Bright indirect light (just back from a sunny window) | When the soil is completely dry, approximately every 14-21 days in summer, monthly in winter | Pet-safe |
| Woolly Sinningia | Bright indirect light (just back from a sunny window) | When top 2–3 cm of compost feels dry during growth | Pet-safe |
| Woolly Weingartia | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in the growing season; once monthly or less in winter. | Pet-safe |
| Woven Matucana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 10-14 days in summer | Pet-safe |
| Wulfen's Alyssum | Direct sun (at least 4-6 hours) | Every 14–21 days during growing season; very little in winter | Pet-safe |
| Yellow Archangel | Medium indirect light (a couple of metres from a window) | Every 7–14 days; drought-tolerant once established in shade | Mildly toxic to pets |
| Yellow Baby Toes | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active growth (autumn through spring); essentially none through summer dormancy | Pet-safe |
| Yellow Bird's Nest | Medium indirect light (a couple of metres from a window) | Maintain water in the central cup; water compost when mostly dry, roughly every 10-14 days | Pet-safe |
| Yellow Clintonia | Low light (north window or shaded room) | Twice weekly in dry spells; maintain even soil moisture throughout the growing season | Pet-safe |
| Yellow Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn; withhold entirely in summer | Pet-safe |
| Yellow Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer through early spring; fully dry throughout June–August | Pet-safe |
| Yellow Crocus | Direct sun (at least 4-6 hours) | Very low — water once at planting; rainfall sufficient during growth; completely dry in summer | Mildly toxic to pets |
| Yellow Fawnlily | Medium indirect light (a couple of metres from a window) | Consistently moist during active growth (late winter to late spring); minimal after dormancy | Mildly toxic to pets |
| Yellow Gesneria | Bright indirect light (just back from a sunny window) | Every 4–5 days during growth; reduce in cooler months | Mildly toxic to pets |
| Yellow Glacier Lily | Medium indirect light (a couple of metres from a window) | Regular during spring growth; reduce sharply after dormancy | Mildly toxic to pets |
| Yellow Heron's Bill | Direct sun (at least 4-6 hours) | Water sparingly every 10-14 days in summer; keep almost completely dry from late autumn to early spring | Mildly toxic to pets |
| Yellow Living Rock Cactus | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 21 days in summer; near-dry in winter | Pet-safe |
| Yellow Monanthes | Bright indirect light (just back from a sunny window) | Sparingly; roughly every 2–3 weeks during active growth (autumn–spring), barely at all in summer | Mildly toxic to pets |
| Yellow Mountain Saxifrage | Direct sun (at least 4-6 hours) | Every 2–4 days during the growing season; keep consistently moist | Pet-safe |
| Yellow Pimpernel | Medium indirect light (a couple of metres from a window) | High; keep consistently moist | Mildly toxic to pets |
| Yellow Promenaea | Medium indirect light (a couple of metres from a window) | Water when the potting medium is nearly dry at the surface but still faintly moist below, roughly every 5-8 days in summer and every 10-14 days in cooler months | Pet-safe |
| 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 Trillium | Medium indirect light (a couple of metres from a window) | Regular during spring growing season; reduced once foliage dies back in summer. | Mildly toxic to pets |
| Yellow Trout Lily | Medium indirect light (a couple of metres from a window) | Water regularly in spring; allow to dry naturally after dormancy sets in | Mildly 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 Whitlow Grass | Direct sun (at least 4-6 hours) | Low — allow soil to dry between waterings | Mildly toxic to pets |
| Yellow Whitlowgrass | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; minimal in winter | Pet-safe |
| Yellow 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 Woodland Violet | Medium indirect light (a couple of metres from a window) | Weekly; maintain evenly moist soil throughout spring and summer | Mildly toxic to pets |
| Yellow-scaled Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active winter growth; completely dry during summer dormancy | Toxic to pets |
| Yellow-Spike Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Yellow-White Maxillaria | Bright indirect light (just back from a sunny window) | Every 2–3 days in growth, every 4–5 days in winter | Pet-safe |
| Yokosca Lady Fern | Low light (north window or shaded room) | Every 2–3 days; keep soil moist to wet | Pet-safe |
| Yokosuka Lady Fern | Medium indirect light (a couple of metres from a window) | Twice weekly during the growing season; reduce in winter | Mildly toxic to pets |
| Zecher's Air Plant | Medium indirect light (a couple of metres from a window) | Soak 30 minutes twice weekly; mist 2-3 times per week between soaks | Pet-safe |
| Zehtner's Discocactus | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is completely dry, roughly every 10-14 days in summer; reduce to once every 4-6 weeks in winter | Pet-safe |
| Zehtner's Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; reduce to once every 3-4 weeks in winter | Pet-safe |
| Zois's Bellflower | Direct sun (at least 4-6 hours) | Low to moderate — water sparingly; allow to nearly dry between waterings | Mildly toxic to pets |
| Zomicarpella amazonica | Medium indirect light (a couple of metres from a window) | Keep evenly moist in growth, surface just drying; reduce while resting | Mildly toxic to pets |
| Zoys's Bellflower | Direct sun (at least 4-6 hours) | Allow soil to dry between waterings; very sparingly in winter | Pet-safe |
| 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 |