| 'Armenian' Cucumber | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in hot weather | Pet-safe |
| 'Bright Lights' Swiss Chard | Direct sun (at least 4-6 hours) | Evenly moist, about 25 mm (1 inch) per week | Pet-safe |
| 'Castelfranco' Radicchio | Direct sun (at least 4-6 hours) | Evenly moist, about every 3-4 days; weekly in cool weather | Pet-safe |
| 'Cavolo Nero' Kale | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days; more in heat | Pet-safe |
| 'Chioggia' Beetroot | Direct sun (at least 4-6 hours) | Keep soil evenly moist, roughly 25 mm (1 inch) per week | Pet-safe |
| 'Crookneck' Summer Squash | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 2-3 days and daily in heat | Pet-safe |
| 'French Breakfast' Radish | Direct sun (at least 4-6 hours) | Consistent moisture, about 25 mm (1 inch) per week | Pet-safe |
| 'Golden' Beetroot | Direct sun (at least 4-6 hours) | Evenly moist, about 25 mm (1 inch) per week | Pet-safe |
| 'Lemon' Cucumber | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in warm weather | Pet-safe |
| 'Painted Mountain' Corn | Direct sun (at least 4-6 hours) | Deeply once or twice a week, about 25mm (1 inch) total, more in heat | Pet-safe |
| 'Paris Market' Carrot | Direct sun (at least 4-6 hours) | Even moisture, about 25 mm (1 inch) per week | Pet-safe |
| 'Red Russian' Kale | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 5-7 days | Pet-safe |
| 'Romanesco' Broccoli | Direct sun (at least 4-6 hours) | Deeply 1-2 times weekly; never let the soil dry out while curds are forming | Pet-safe |
| 'Watermelon' Radish | Direct sun (at least 4-6 hours) | Steady moisture, about 25 mm (1 inch) per week | Pet-safe |
| Abyssinian Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Acer capillipes | Bright indirect light (just back from a sunny window) | Water deeply weekly while establishing; supplement in summer droughts | Pet-safe |
| Acer griseum | Direct sun (at least 4-6 hours) | Water deeply weekly while establishing; supplement in summer droughts | Pet-safe |
| Acer palmatum 'Atropurpureum' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply through dry weather | Pet-safe |
| Acer palmatum 'Butterfly' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist, more often in pots and heat | Pet-safe |
| Acer rubrum 'Autumn Blaze' | Direct sun (at least 4-6 hours) | Weekly while establishing; deep watering in droughts thereafter | Pet-safe |
| Acer rubrum 'October Glory' | Direct sun (at least 4-6 hours) | Weekly while establishing; deep watering in dry spells thereafter | Pet-safe |
| Acorn Squash | Direct sun (at least 4-6 hours) | Every 2–3 days | Pet-safe |
| Adagio Maiden Grass | Direct sun (at least 4-6 hours) | Weekly for the first season; every 2–3 weeks once established | Pet-safe |
| Adolphe Audusson Camellia | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; keep consistently moist but not waterlogged | Pet-safe |
| Adriatic Bellflower | Bright indirect light (just back from a sunny window) | Weekly during spring and summer; minimal in winter | Pet-safe |
| Adzuki Bean | Direct sun (at least 4-6 hours) | Once or twice per week | 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 |
| 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 |
| African Blue Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in warm weather | Pet-safe |
| African Crossandra | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season, reducing to every 10–14 days in winter | Pet-safe |
| African feather grass | Direct sun (at least 4-6 hours) | Every 1–2 weeks once established; more frequently when newly planted | Pet-safe |
| African Moringa | Direct sun (at least 4-6 hours) | Every 7–10 days in active growth; reduce in cooler months | Pet-safe |
| African Oil Palm | Direct sun (at least 4-6 hours) | When the top 4-6 cm of soil is dry, roughly every 7-10 days in summer; every 14-21 days in winter | Pet-safe |
| African Tamarisk | Direct sun (at least 4-6 hours) | Low once established; moderate during establishment | Pet-safe |
| African Violet 'Blue Nile' | Bright indirect light (just back from a sunny window) | When the top of the soil feels barely dry, roughly every 5-7 days | Pet-safe |
| Afro Hard Rush | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water 1–2 times per week in warm weather | Pet-safe |
| Agastache 'Blue Fortune' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Agave Cactus | 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; very sparingly in winter | Pet-safe |
| Agave-Leaved Sea Holly | Direct sun (at least 4-6 hours) | Low — occasional deep watering during the first season, minimal thereafter | Pet-safe |
| Agnes Rose | Direct sun (at least 4-6 hours) | Deep watering once a week, more in drought or first season | Pet-safe |
| Aizoon Rosularia | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in spring and summer; rarely in winter | Pet-safe |
| Albert's Gold tree heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks in summer once established | Pet-safe |
| Alcantarea imperialis | Bright indirect light (just back from a sunny window) | Keep the central tank filled; water the mix when its top 4-5 cm is dry | Pet-safe |
| Alcantarea odorata | Bright indirect light (just back from a sunny window) | Keep the central tank filled; water the mix when its top 4-5 cm is dry | Pet-safe |
| Alexandria Alpine Strawberry | Bright indirect light (just back from a sunny window) | Every 2–3 days in active growth, less in winter | Pet-safe |
| Algerian Fir | Direct sun (at least 4-6 hours) | Low to moderate; highly drought-tolerant once established | Pet-safe |
| All Gold Lemon Balm | Medium indirect light (a couple of metres from a window) | Every 3–5 days; when top inch of soil feels dry | Pet-safe |
| Allegheny Chinkapin | Direct sun (at least 4-6 hours) | Water weekly through establishment; thereafter only in extended drought | Pet-safe |
| Allegheny serviceberry | Bright indirect light (just back from a sunny window) | Weekly during establishment; moderate once established | Pet-safe |
| 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 |
| Alphonse Karr Bamboo | Direct sun (at least 4-6 hours) | Regularly during summer, approximately every 5–7 days; reduce in cooler months as growth slows | Pet-safe |
| Alpine Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Alpine Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Alpine Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks when in growth (spring–summer); very sparingly in winter | Pet-safe |
| Altissimo Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the first season; established plants when the top 5 cm of soil is dry | Pet-safe |
| Amalia's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Daily to every other day; medium must stay damp but not sodden | Pet-safe |
| Amanus Oregano | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; monthly in winter | Pet-safe |
| Amazon Moonflower Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of substrate is dry, roughly every 7-10 days in the growing season; every 2-3 weeks in a cooler rest period | Pet-safe |
| Ambarella | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant when established | Pet-safe |
| America Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while establishing; mature plants when the top few centimetres of soil dry out | Pet-safe |
| American Basswood | Bright indirect light (just back from a sunny window) | Weekly during establishment; less once mature | Pet-safe |
| American Beachgrass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| American Chestnut | Direct sun (at least 4-6 hours) | Deep weekly soak in the first two seasons; established trees need water only in prolonged drought | Pet-safe |
| American Dunegrass | Direct sun (at least 4-6 hours) | Low; drought-tolerant | Pet-safe |
| American Lady Fern | Low light (north window or shaded room) | Every 2–3 days during active growth; less frequently in winter | Pet-safe |
| American Wall Fern | Medium indirect light (a couple of metres from a window) | Every 7–10 days when in growth; every 2–3 weeks in winter | Pet-safe |
| Ananas bracteatus | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, about every 7-10 days in growth, less in winter | Pet-safe |
| Ananas comosus 'Variegatus' | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, about every 7-10 days in growth, less in winter | Pet-safe |
| Anderson's Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Anderson's Holly Fern | Medium indirect light (a couple of metres from a window) | Twice weekly in the growing season, weekly in winter | Pet-safe |
| 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 |
| Angelina Stonecrop | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in summer; little to none in winter | Pet-safe |
| 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 |
| Anise hyssop | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Anjou pear | Direct sun (at least 4-6 hours) | Weekly during establishment, then every 10–14 days in summer | Pet-safe |
| Annual Phlox | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil evenly moist but not saturated | Pet-safe |
| Antirrhinum majus 'Rocket Red' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Antirrhinum majus 'Sonnet Pink' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Antirrhinum majus 'Twinny Peach' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Appalachian Barren Strawberry | Medium indirect light (a couple of metres from a window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Appalachian Blazing Star | Direct sun (at least 4-6 hours) | Every 2 weeks during establishment; essentially rain-fed once mature | Pet-safe |
| Aptos Blue Redwood | Direct sun (at least 4-6 hours) | Weekly when young; every 1–2 weeks when established | Pet-safe |
| Aquadulce Broad Bean | Direct sun (at least 4-6 hours) | Every 7-10 days; increase to every 5 days at flowering and pod swelling | Pet-safe |
| Arching Spider Orchid | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of the bark mix is dry, roughly every 7-10 days in summer | Pet-safe |
| Arendsii astilbe | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer; weekly otherwise | Pet-safe |
| Arikury Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| 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 |
| Aromatic Aster | Direct sun (at least 4-6 hours) | Water to establish, then rarely; very drought-tolerant | Pet-safe |
| Arp Rosemary | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season, less in winter | Pet-safe |
| Arp Rosemary | Direct sun (at least 4-6 hours) | When the top few centimetres of soil are dry, roughly every 7-10 days, less in cool weather | Pet-safe |
| Arrowwood Viburnum | Direct sun (at least 4-6 hours) | Weekly when young; established plants tolerate both moist and occasionally dry soil | Pet-safe |
| Arugula | Bright indirect light (just back from a sunny window) | Every 2–4 days; keep soil evenly moist | Pet-safe |
| Ashy Sunflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very drought-tolerant | 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 |
| Assai Palm | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in warm weather | Pet-safe |
| Assam Fan Palm | Direct sun (at least 4-6 hours) | Weekly in growing season, every 2–3 weeks in winter | Pet-safe |
| Aster 'October Skies' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Aster 'Raydon's Favorite' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Aster × frikartii 'Mönch' | Direct sun (at least 4-6 hours) | Water to establish, then moderately; water in prolonged dry spells | Pet-safe |
| Astilbe 'Deutschland' | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water every 3-5 days or as needed to prevent the top 2 cm of soil drying out | Pet-safe |
| Astilbe 'Fanal' | Medium indirect light (a couple of metres from a window) | Consistently moist — water whenever the top 2-3 cm of soil begins to dry, roughly every 3-5 days in summer | Pet-safe |
| Audray White globe amaranth | Direct sun (at least 4-6 hours) | Every 5–7 days; drought-tolerant once established | Pet-safe |
| Aureola Japanese Forest Grass | 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 in the growing season | Pet-safe |
| Australian Bangalow Palm | Direct sun (at least 4-6 hours) | Weekly during establishment; every 10–14 days once established in-ground | Pet-safe |
| Australian Cabbage Palm | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm of soil dries out, roughly every 10-14 days in active growth | Pet-safe |
| Australian Fan Palm | Bright indirect light (just back from a sunny window) | Weekly in the growing season; every 10–14 days in winter | Pet-safe |
| Australian Saltbush | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established | Pet-safe |
| Autumn Brilliance serviceberry | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once established | Pet-safe |
| Autumn Catchfly | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; reduce in winter | Pet-safe |
| Autumn heath | Direct sun (at least 4-6 hours) | Fortnightly during establishment; drought-tolerant once established | Pet-safe |
| Autumn King Carrot | Direct sun (at least 4-6 hours) | Even and moderate through the long season; water weekly, more in dry spells | Pet-safe |
| Autumn Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and early summer; taper to every 2–3 weeks in late summer | Pet-safe |
| Autumn Magic chokeberry | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Pet-safe |
| Autumn Moor Grass | Medium indirect light (a couple of metres from a window) | Every 10-14 days during establishment; drought-tolerant once established | Pet-safe |
| Autumn Olive | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly while young, rarely once established | Pet-safe |
| autumn red grass | Direct sun (at least 4-6 hours) | Every 7–14 days during the growing season; reduce in autumn and winter | Pet-safe |
| Autumn Sage | Direct sun (at least 4-6 hours) | Occasional once established; regular for first season | Pet-safe |
| Avalanche Reed Grass | Bright indirect light (just back from a sunny window) | Every 7-14 days; keep moderately moist in the growing season | Pet-safe |
| Ayabaca Masdevallia | Medium indirect light (a couple of metres from a window) | Every 2–3 days; keep medium consistently moist | Pet-safe |
| Azores Jasmine | Direct sun (at least 4-6 hours) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| 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 |
| Baby rubber plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-14 days in summer and every 2-3 weeks in winter | Pet-safe |
| Baby Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Baby Tears Plant | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist, watering every 3-5 days | Pet-safe |
| Baby's Tears | Bright indirect light (just back from a sunny window) | Every 2-4 days; keep soil consistently moist | Pet-safe |
| Bachelor's button | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Bacopa | Bright indirect light (just back from a sunny window) | Every 2–3 days in containers during warm weather; reduce in cooler conditions | Pet-safe |
| Bahia Earth Star | Bright indirect light (just back from a sunny window) | Water soil when top 2-3 cm is dry, roughly every 7-14 days | Pet-safe |
| Bahian Neoregelia | Direct sun (at least 4-6 hours) | Water sparingly; allow potting medium to dry between waterings and keep a small amount of water in the central cup | Pet-safe |
| Bailey Palm | Direct sun (at least 4-6 hours) | When the top 6-10 cm of soil is dry, roughly every 10-14 days in the growing season; every 4-6 weeks in winter | Pet-safe |
| Balkan Saxifrage | Direct sun (at least 4-6 hours) | Low — water at the base only; allow near-drying between waterings | Pet-safe |
| Balsam Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; naturally rainfall-sustained thereafter | Pet-safe |
| Bamboo Muhly | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter once established | Pet-safe |
| Bamboo Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days (keep soil evenly moist but never waterlogged) | Pet-safe |
| bamburanta | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| 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 |
| Barbados Maidenhair Fern | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep consistently moist | Pet-safe |
| Barbecue Rosemary | Direct sun (at least 4-6 hours) | Every 7–14 days during active growth, every 2–3 weeks when dormant | Pet-safe |
| Barbecue Rosemary | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days | 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 |
| Barrelier's Sage | Direct sun (at least 4-6 hours) | Weekly to establish, then fortnightly | Pet-safe |
| Barren Strawberry | Medium indirect light (a couple of metres from a window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Basket Bromeliad | Medium indirect light (a couple of metres from a window) | Tank every 5–7 days; soil every 10–14 days | Pet-safe |
| Basketgrass | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Batavian Lettuce | Bright indirect light (just back from a sunny window) | 2–3 times per week | Pet-safe |
| Beach Strawberry | Direct sun (at least 4-6 hours) | Low to moderate — drought-tolerant once established; water every 10–14 days in dry periods | Pet-safe |
| Beacon Silver Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–10 days; water more frequently in sunny or dry situations | Pet-safe |
| Beaked Hazelnut | Bright indirect light (just back from a sunny window) | Water every 7-14 days while establishing and in drought; established shrubs are fairly self-reliant | 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 |
| Bearded-Stem Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to partially dry between waterings) | Pet-safe |
| Beaucarnea Gracilis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Pet-safe |
| Beaucarnea Stricta | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and much less in winter | Pet-safe |
| Beauregard Sweet Potato | Direct sun (at least 4-6 hours) | Water deeply every 5-7 days; reduce to every 10-14 days as vines mature and in the final weeks before harvest | Pet-safe |
| beautiful feather grass | Direct sun (at least 4-6 hours) | Weekly in the first season; minimal once established | Pet-safe |
| 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-net Lepanthes | Medium indirect light (a couple of metres from a window) | Daily to every 2 days; never allow roots to dry out completely | Pet-safe |
| Beavertail Cactus | Direct sun (at least 4-6 hours) | Very sparingly when soil is bone dry, roughly every 3-4 weeks in summer; keep dry in winter | Pet-safe |
| Bee Balm 'Cambridge Scarlet' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Pet-safe |
| Bee Orchid | Bright indirect light (just back from a sunny window) | Low; drought-tolerant once established | Pet-safe |
| Bell heather | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2–3 weeks once established | Pet-safe |
| Bellina Moth Orchid | Bright indirect light (just back from a sunny window) | Roughly every 5-7 days; when potting media is nearly dry but not bone dry | Pet-safe |
| Benary's Giant Coral Zinnia | Direct sun (at least 4-6 hours) | Water at the base every 5-7 days, allowing the top 3-5 cm of soil to dry between waterings; overhead watering should be avoided | 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 |
| Beoley Gold heather | Direct sun (at least 4-6 hours) | Weekly during establishment; occasional watering once established in dry spells | Pet-safe |
| Berggarten Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; about every 7-10 days, less in cool weather | Pet-safe |
| Berry Smoothie Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Bertolonia maculata | Bright indirect light (just back from a sunny window) | Keep the mix evenly moist, watering when the top layer just starts to dry, roughly every 4-6 days | Pet-safe |
| Besom heath | Direct sun (at least 4-6 hours) | Weekly during establishment; largely self-sufficient once established | Pet-safe |
| Bidens ferulifolia 'Bidy Gonzales' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in containers during summer heat | Pet-safe |
| Bidens ferulifolia 'Campfire Fireburst' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in summer containers | Pet-safe |
| Big Bluestem | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; rainfall-sufficient once established in most of its native range | Pet-safe |
| Big 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 |
| Big-Flowered Catmint | Direct sun (at least 4-6 hours) | Every 7–10 days; allow soil surface to dry between waterings | Pet-safe |
| Bigcone Douglas Fir | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established | Pet-safe |
| Bigleaf Magnolia | Bright indirect light (just back from a sunny window) | Deeply twice weekly during establishment; weekly once established in dry periods | Pet-safe |
| Billbergia 'Fantasia' | Bright indirect light (just back from a sunny window) | Keep the central vase topped up; flush and refill every 1-2 weeks, water the mix when it dries | Pet-safe |
| Birchleaf Spirea | Direct sun (at least 4-6 hours) | Weekly until established; occasional watering in drought once mature | Pet-safe |
| Bird's Nest Bromeliad | Low light (north window or shaded room) | Refill central cup weekly; substrate every 10–14 days | Pet-safe |
| Bird's Nest Bromeliad | Medium indirect light (a couple of metres from a window) | Keep the central cup filled; water the compost lightly every 10-14 days | Pet-safe |
| Bird's Nest Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing; deep watering when the top 5 cm of soil is dry | Pet-safe |
| Birdcatcher Parlour Palm | Low light (north window or shaded room) | Every 10–14 days in summer, every 2–3 weeks in winter | Pet-safe |
| Biriba | Direct sun (at least 4-6 hours) | 2–3 times per week; do not allow soil to dry out | Pet-safe |
| Bisset's Bamboo | Direct sun (at least 4-6 hours) | Weekly during the growing season; every 2–3 weeks when dormant | Pet-safe |
| Bitternut Hickory | Direct sun (at least 4-6 hours) | Tolerates wet sites; water young trees every 7-10 days in dry spells | Pet-safe |
| Bitterroot | Direct sun (at least 4-6 hours) | Winter rains / early spring only; bone dry from June to October | Pet-safe |
| Black Ash | Direct sun (at least 4-6 hours) | High; requires consistently moist to wet soil | Pet-safe |
| Black Ball cornflower | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Black Bamboo | Direct sun (at least 4-6 hours) | Weekly when establishing; reduce once established | Pet-safe |
| Black crowberry | Bright indirect light (just back from a sunny window) | Moderately frequent; keep moist but not waterlogged | Pet-safe |
| Black Currant | Direct sun (at least 4-6 hours) | Moderate — 2–3 cm per week; increase during fruit swelling in June–July | Pet-safe |
| Black Gram | Direct sun (at least 4-6 hours) | Once or twice per week | Pet-safe |
| Black Hickory | Direct sun (at least 4-6 hours) | Very drought-tolerant once established; water young trees every 10-14 days in dry spells | Pet-safe |
| Black Knight scabiosa | Direct sun (at least 4-6 hours) | Once or twice weekly | Pet-safe |
| Black Medick | Direct sun (at least 4-6 hours) | Low to moderate | Pet-safe |
| Black Mulberry | Direct sun (at least 4-6 hours) | Water young trees weekly; established trees only in prolonged drought | Pet-safe |
| Black Pepper | Bright indirect light (just back from a sunny window) | Every 2–3 days when actively growing; allow the top 3–5 cm to dry slightly between waterings | Pet-safe |
| Black Prince Echeveria | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Black Prince snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil consistently moist | Pet-safe |
| Black Spanish Radish | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Black Spruce | Direct sun (at least 4-6 hours) | Consistent moisture; tolerates waterlogging — does not dry out between waterings | Pet-safe |
| Black-Headed Fountain Grass | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2 weeks once established | 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 |
| Blackberry 'Triple Crown' | Direct sun (at least 4-6 hours) | Deeply once a week, about 25 mm, more during fruit development | Pet-safe |
| Blackhaw Viburnum | Direct sun (at least 4-6 hours) | Weekly while establishing; established plants need water only in extended drought | Pet-safe |
| Blanc Double de Coubert Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Blanco's Sage | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | Pet-safe |
| Blanket flower | Direct sun (at least 4-6 hours) | Every 7–14 days once established; water young plants more frequently | 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 |
| Blonde Ambition Rush | Bright indirect light (just back from a sunny window) | Keep soil consistently moist to wet at all times | Pet-safe |
| Blonde Sedge | Bright indirect light (just back from a sunny window) | Moderate; drought-tolerant once established | Pet-safe |
| Blood Banana | Direct sun (at least 4-6 hours) | Roughly weekly in active growth; every 10-14 days in winter | Pet-safe |
| Blood-red Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; keep medium consistently lightly moist | Pet-safe |
| Bloodgood Japanese Maple | Bright indirect light (just back from a sunny window) | When the top 3–5 cm of soil is dry, roughly every 5–7 days in summer; weekly to fortnightly in autumn and spring | Pet-safe |
| Bloodleaf Plant | Bright indirect light (just back from a sunny window) | Every 7 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Blue Boy cornflower | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Blue Columnar Cactus | Direct sun (at least 4-6 hours) | When the top half of soil is dry, roughly every 10-14 days in summer; every 4-6 weeks in winter | Pet-safe |
| Blue Creeping Speedwell | Direct sun (at least 4-6 hours) | Moderate; allow the top few centimetres to dry between waterings | Pet-safe |
| Blue Dendrobium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 2–3 weeks in winter | Pet-safe |
| Blue Echeveria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Blue Giant Sequoia | Direct sun (at least 4-6 hours) | Deeply weekly for 3–5 years during establishment | Pet-safe |
| Blue Hair Grass | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; water sparingly | Pet-safe |
| Blue Heaven Little Bluestem | Direct sun (at least 4-6 hours) | Every 14-21 days once established; very drought-tolerant | Pet-safe |
| Blue Java Banana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-10 days depending on temperature | Pet-safe |
| Blue Latan Palm | Direct sun (at least 4-6 hours) | Every 7–10 days in growing season; less in winter | Pet-safe |
| Blue Latan Palm | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| Blue 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 Oat Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Blue Rabbit's Foot Fern | Bright indirect light (just back from a sunny window) | When the growing medium is nearly dry, roughly every 5-10 days in summer | Pet-safe |
| Blue Ridge Creeping Phlox | Medium indirect light (a couple of metres from a window) | Weekly in the first season; every 1–2 weeks once established | Pet-safe |
| Blue sedge | Bright indirect light (just back from a sunny window) | Water regularly until established; minimal thereafter | Pet-safe |
| Blue Spruce Sedum | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer, less in winter | Pet-safe |
| Blue Spruce Stonecrop | Direct sun (at least 4-6 hours) | Every 14-21 days in spring and summer; monthly or less in winter | Pet-safe |
| Blue Vanda | Direct sun (at least 4-6 hours) | Daily in warm months when roots silver over; every 2-3 days in cool, dim weather | Pet-safe |
| Blue-stemmed Polypody | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and summer; every 10–14 days in winter | Pet-safe |
| Blueberry 'Top Hat' | Direct sun (at least 4-6 hours) | Keep evenly moist; water 2-3 times weekly in summer, more in heat | Pet-safe |
| bluejoint reedgrass | Direct sun (at least 4-6 hours) | Keep consistently moist to wet; suited to boggy and seasonally flooded ground | Pet-safe |
| 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 |
| 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 |
| Bolus' Stomatium | Bright indirect light (just back from a sunny window) | Very sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Bonica Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | Pet-safe |
| 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 |
| Borden's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Border Forsythia | Direct sun (at least 4-6 hours) | Weekly during the first year, then only in prolonged drought | Pet-safe |
| Boston Fern | Medium indirect light (a couple of metres from a window) | Every 3–4 days in spring and summer; every 5–7 days in winter | Pet-safe |
| Boston Fern 'Fluffy Ruffles' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 3-5 days | Pet-safe |
| Bougainvillea 'Barbara Karst' | Direct sun (at least 4-6 hours) | Deeply but infrequently, only when the top 5 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| Bougainvillea 'San Diego Red' | Direct sun (at least 4-6 hours) | Deep soak only when the top 5 cm of soil dries, about every 7-14 days | Pet-safe |
| Bouquet Dill | Direct sun (at least 4-6 hours) | Every 3–5 days; water deeply when the top 2 inches of soil are dry | Pet-safe |
| Bow Bells Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; every 10–14 days in winter | Pet-safe |
| Bracteate Rhinephyllum | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring–summer; minimal in winter | Pet-safe |
| Bracted Aechmea | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Bracted Dendrobium | Bright indirect light (just back from a sunny window) | Freely when in active growth (every 2-4 days); reduce sharply to monthly in the dry winter rest | Pet-safe |
| Bracted Lipstick Plant | Bright indirect light (just back from a sunny window) | Water when the top 2–3 cm of mix has dried; roughly every 7 days in summer, every 10–14 days in winter | Pet-safe |
| Bracted Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in winter | Pet-safe |
| Brain Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in spring and summer; nearly dry through winter | Pet-safe |
| Brassavola digbyana | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; far less in winter rest, every 2-3 weeks | Pet-safe |
| Braun's Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days; keep evenly moist | Pet-safe |
| Braun's Holly Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days; maintain consistently moist but well-drained soil | Pet-safe |
| Brazilian Araucaria | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Brazilian Plume | Bright indirect light (just back from a sunny window) | Regularly — keep soil consistently moist but never waterlogged | Pet-safe |
| Brazilian Tree Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season, once a week in winter | Pet-safe |
| Breadnut | Direct sun (at least 4-6 hours) | Water young trees 2–3 times per week; established trees are moderately drought tolerant but benefit from weekly deep irrigation in dry seasons. | Pet-safe |
| Bressingham White Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days during the growing season; reduce in autumn and winter | Pet-safe |
| Brewer Spruce | Direct sun (at least 4-6 hours) | Moderate — water regularly during establishment; tolerates summer drought once established | Pet-safe |
| Bridal Wreath Spirea | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry, about weekly while establishing | Pet-safe |
| Bridal Wreath Spirea | Direct sun (at least 4-6 hours) | Every 7-10 days during dry spells; established plants are drought-tolerant | Pet-safe |
| Brilliantelse Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days; never allow to fully dry out | Pet-safe |
| Brilliantissima red chokeberry | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once established | Pet-safe |
| Bristle-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow top half of soil to dry) | Pet-safe |
| Bristly Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; medium kept consistently moist | Pet-safe |
| Bristol Ruby Weigela | Direct sun (at least 4-6 hours) | Every 7-10 days during dry spells; established plants cope with moderate drought | Pet-safe |
| British Yellowhead | Direct sun (at least 4-6 hours) | Once or twice per week; drought-tolerant once established | Pet-safe |
| Britten's Tiger Jaws | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season (late summer–autumn); minimal in winter and spring | Pet-safe |
| 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 |
| Brittle Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in warm months; every 4–5 days in winter | Pet-safe |
| Broad Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–4 days in the growing season; every 5–7 days in winter | Pet-safe |
| Broad-leaf Chain Orchid | Medium indirect light (a couple of metres from a window) | Every 5-7 days in growth; every 10-14 days in winter | Pet-safe |
| Broad-Leaved Lime | Bright indirect light (just back from a sunny window) | Weekly during establishment; supplemental watering in prolonged drought | Pet-safe |
| Broad-Leaved Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Pet-safe |
| Broad-leaved Thyme | Direct sun (at least 4-6 hours) | Every 7–14 days; minimal supplemental watering once established in the ground | Pet-safe |
| Broad-Petalled Cranesbill | Bright indirect light (just back from a sunny window) | Once or twice a week in the growing season; less in winter | Pet-safe |
| Broad-Sepal Gongora | Bright indirect light (just back from a sunny window) | Every 4–6 days during growth; every 10–14 days in winter | Pet-safe |
| Broadleaf Bamboo | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer, once per week in winter | Pet-safe |
| Broadleaf Stonecrop | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Pet-safe |
| 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 |
| Bronze Fennel | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly weekly in summer | Pet-safe |
| Broom Palm | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-14 days in the growing season | Pet-safe |
| Broomsedge Bluestem | Direct sun (at least 4-6 hours) | Rainfall sufficient; no supplemental irrigation needed once established | 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 |
| Brush Cherry | Bright indirect light (just back from a sunny window) | Weekly when young; every 10–14 days once established | Pet-safe |
| 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 |
| 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 longissimum | Bright indirect light (just back from a sunny window) | Water as the medium nears dryness, roughly every 2-4 days; more often when mounted in warm weather | Pet-safe |
| Bulbophyllum vaginatum | Bright indirect light (just back from a sunny window) | Water as the medium approaches dryness, around every 2-4 days; daily when mounted in heat | Pet-safe |
| Bulbous Trichodiadema | Direct sun (at least 4-6 hours) | Every 2–3 weeks during spring and summer; once a month or less in winter | Pet-safe |
| Bullate Nautilocalyx | Medium indirect light (a couple of metres from a window) | Every 2–4 days in the growing season; reduce to once weekly in autumn–winter | Pet-safe |
| Bunny ears cactus | Direct sun (at least 4-6 hours) | When the compost is fully dry, roughly every 2-3 weeks in spring and summer | Pet-safe |
| Burgundy Lace Japanese Painted Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season, reduce significantly in winter dormancy | Pet-safe |
| Burkwood Viburnum | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil dries, roughly weekly during establishment | Pet-safe |
| Burnet Rose | Direct sun (at least 4-6 hours) | Weekly during establishment; rarely once mature | Pet-safe |
| Burpless Cucumber | Direct sun (at least 4-6 hours) | Every 1-3 days, keeping the rootzone evenly moist; daily under glass in heat | Pet-safe |
| Burton's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; reduce to every 3–4 weeks in winter | Pet-safe |
| Bush Hoya | Bright indirect light (just back from a sunny window) | Roughly weekly in summer; every 10-14 days in winter | Pet-safe |
| Bush Muhly | Direct sun (at least 4-6 hours) | Every 14-21 days during establishment; essentially rainfall-dependent once established in suitable climates | Pet-safe |
| Bushgrass | Medium indirect light (a couple of metres from a window) | Moderate — water regularly to establish, then largely drought-tolerant | Pet-safe |
| Butterfield Holly Fern | Low light (north window or shaded room) | Every 7–14 days; much less in winter | Pet-safe |
| Butterfly Orchid | Bright indirect light (just back from a sunny window) | When the bark surface is nearly dry, every 7-10 days; never allow prolonged bone dryness | Pet-safe |
| Butterhead Lettuce | Bright indirect light (just back from a sunny window) | Every 2–3 days; daily in warm weather | Pet-safe |
| 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 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 |
| C.D. Eason bell heather | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once settled | Pet-safe |
| Cabada Palm | Direct sun (at least 4-6 hours) | Every 3–5 days when young; drought-tolerant once established | Pet-safe |
| Cabbage Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of the growing medium feel dry, roughly every 5-7 days in summer | Pet-safe |
| Cacti (general care) | Direct sun (at least 4-6 hours) | Soak when the mix is bone dry — roughly every 2-4 weeks in summer | Pet-safe |
| Calabrese Broccoli | Direct sun (at least 4-6 hours) | Water deeply and consistently; about weekly, more in heat | Pet-safe |
| Calathea 'Flamestar' | Bright indirect light (just back from a sunny window) | Roughly weekly; water when the top 2-3 cm (about 1 inch) of soil feels dry | Pet-safe |
| Calathea 'Flamestar' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil dries, roughly every 5-7 days in growth | Pet-safe |
| Calathea Bacillaris | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil starts to dry, roughly every 5-7 days in growth | Pet-safe |
| Calathea Cylindrica | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is just dry, roughly every 5-7 days in growth | Pet-safe |
| Calathea Dottie | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Calathea Freddie | Bright indirect light (just back from a sunny window) | When the top inch of soil is dry, roughly weekly in spring and summer and every 10-14 days in winter | Pet-safe |
| Calathea Leopardina | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Calathea Lietzei | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Calathea Loeseneri (Brazilian Star) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil dries, roughly every 5-7 days in growth | Pet-safe |
| Calathea Setosa | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Calathea White Star | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of soil is just dry, roughly every 5-7 days | Pet-safe |
| Calendula | Direct sun (at least 4-6 hours) | Moderate — roughly weekly once established | Pet-safe |
| Calendula 'Indian Prince' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Calendula 'Radio' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Calico Aster | Bright indirect light (just back from a sunny window) | Water to establish, then occasionally; tolerates dry soil | Pet-safe |
| California Fescue | Bright indirect light (just back from a sunny window) | Water every 10-14 days during the first growing season; established plants are summer-dormant and very drought-tolerant, needing little or no supplemental water | Pet-safe |
| California Giant Chain Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days; keep soil consistently moist but not waterlogged | Pet-safe |
| California Shield Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; reduce in winter | Pet-safe |
| California Sunset | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn/winter | Pet-safe |
| Callicarpa 'Pearl Glam' | Direct sun (at least 4-6 hours) | Water weekly during the first season; established plants are fairly drought-tolerant and need water mainly in dry spells | Pet-safe |
| Calypso Cilantro | Bright indirect light (just back from a sunny window) | Every 2–3 days, or when the top inch of soil is dry | Pet-safe |
| Camarosa Strawberry | Direct sun (at least 4-6 hours) | Daily to every 2 days in warm, dry conditions; every 3–4 days in cool weather | Pet-safe |
| Camas | Bright indirect light (just back from a sunny window) | Regular during spring growth; tolerates summer drought when dormant | Pet-safe |
| Cambria Orchid | Bright indirect light (just back from a sunny window) | When the surface of the mix begins to dry, roughly every 4-7 days | Pet-safe |
| Camellia 'Donation' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist in late summer | Pet-safe |
| Camellia 'Jury's Yellow' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply once or twice weekly in summer, especially during bud set | Pet-safe |
| Camellia 'Mine-no-Yuki' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days through the growing season | Pet-safe |
| Camellia 'Yuletide' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during active growth | Pet-safe |
| Campbell's Magnolia | Direct sun (at least 4-6 hours) | Every 7-10 days during the first three growing seasons; established trees need watering only during prolonged summer drought | Pet-safe |
| Camphor Catmint | Direct sun (at least 4-6 hours) | Every 10–14 days in growing season; monthly in winter | Pet-safe |
| Camphor Thyme | Direct sun (at least 4-6 hours) | Every 14–21 days; very drought-tolerant once established | Pet-safe |
| Camphor-leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Camu Camu | Bright indirect light (just back from a sunny window) | Every 2–4 days; keep consistently moist to wet | Pet-safe |
| Canary Island Date Palm | Direct sun (at least 4-6 hours) | Every 7-10 days in summer; roughly every 2-3 weeks in winter | Pet-safe |
| Canary Island Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; minimal in cool or wet periods | Pet-safe |
| Canary Island Sea Lavender | Direct sun (at least 4-6 hours) | Every 1–2 weeks in growth; monthly in winter | Pet-safe |
| Candelabra Sage | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season | Pet-safe |
| Candia Sulcorebutia | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; virtually none from October to March | Pet-safe |
| Candy Stripe Creeping Phlox | Direct sun (at least 4-6 hours) | Every 7–10 days during the establishment year; drought-tolerant thereafter | Pet-safe |
| 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 |
| Canyon Liveforever | Direct sun (at least 4-6 hours) | Every 2–3 weeks in winter/spring; minimal to none in summer | Pet-safe |
| Canyon Sage | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established | Pet-safe |
| Cape jewels | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 5–7 days in borders | Pet-safe |
| Caradonna Salvia | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Pet-safe |
| Caranday Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in dry season / winter | Pet-safe |
| Caraway | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant once established | Pet-safe |
| Caraway Thyme | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 7-14 days once established | Pet-safe |
| 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 |
| Carnarvon Fan Palm | Direct sun (at least 4-6 hours) | Weekly during active growth; every 2–3 weeks when established | Pet-safe |
| Carnauba Wax Palm | Direct sun (at least 4-6 hours) | When the top 5-10 cm of soil is dry, roughly every 10-14 days in the growing season; every 3-5 weeks in winter | Pet-safe |
| Carob | Direct sun (at least 4-6 hours) | When soil is dry well below the surface, every 1-3 weeks once established | Pet-safe |
| 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 Hemlock | Bright indirect light (just back from a sunny window) | Weekly during establishment; monthly deep watering once established in cool climates | Pet-safe |
| Carousel Little Bluestem | Direct sun (at least 4-6 hours) | Every 14-21 days during establishment; minimal once established | Pet-safe |
| Carpathian bellflower | Direct sun (at least 4-6 hours) | Every 5–7 days during active growth; moderate moisture needs | Pet-safe |
| Carpentaria Palm | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in warm weather | Pet-safe |
| Carrion Flower (Stapelia gigantea) | Direct sun (at least 4-6 hours) | Every 2-3 weeks in active growth (spring-autumn); keep nearly dry in winter | Pet-safe |
| Cas Guava | Direct sun (at least 4-6 hours) | Water deeply 2–3 times per week in the growing season; reduce to once weekly in winter. | Pet-safe |
| Cascade Purple Aubrieta | Direct sun (at least 4-6 hours) | Weekly during active growth; minimal in summer dormancy | Pet-safe |
| Cascadia trailing petunia | Direct sun (at least 4-6 hours) | Every 2-3 days in warm weather; check daily in summer heat | Pet-safe |
| Cast iron plant | Low light (north window or shaded room) | When the top 3 cm of soil is dry, every 10-14 days | Pet-safe |
| Catnip | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Caucasian Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Cavendish Banana | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water when the top 2-3 cm dries, often every 2-4 days in active growth | Pet-safe |
| 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 |
| Cecile Brunner Climbing Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while young; established plants are fairly drought-tolerant and need water mainly in dry spells | Pet-safe |
| Cedar Bay Cherry | Direct sun (at least 4-6 hours) | Water established plants once or twice per week; newly planted specimens require daily watering for the first 4–6 weeks. | Pet-safe |
| Cedros Island Liveforever | Direct sun (at least 4-6 hours) | Every 4–6 weeks in summer (dormant), every 2–3 weeks in winter–spring (active) | Pet-safe |
| Celeriac | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply 2-3 times per week, roughly 25-30 mm per week | Pet-safe |
| Celeriac 'Brilliant' | Direct sun (at least 4-6 hours) | Keep consistently moist, watering deeply 2-3 times a week, roughly 25 mm per week | Pet-safe |
| Celeriac 'Monarch' | Direct sun (at least 4-6 hours) | Keep soil constantly moist; about 2-3 cm weekly, more in heat — never allow it to dry out | Pet-safe |
| Celeriac 'Prinz' | Direct sun (at least 4-6 hours) | Keep soil constantly moist; about 2-3 cm of water weekly, more in heat — never let it dry out | Pet-safe |
| Celery | Direct sun (at least 4-6 hours) | Every 2–4 days; soil must remain consistently moist | Pet-safe |
| Celosia argentea var. cristata 'Chief Mix' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Centaurea 'Amethyst in Snow' | Direct sun (at least 4-6 hours) | Weekly through the first season; established clumps are drought-tolerant | Pet-safe |
| Central Australian Cabbage Palm | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry between waterings | Pet-safe |
| Central Australian Cabbage Palm | Direct sun (at least 4-6 hours) | Water deeply every 14-21 days; highly drought-tolerant once established | 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 |
| Ceropegia woodii f. variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Cettos Achimenes | Bright indirect light (just back from a sunny window) | Evenly moist during the growing season; completely dry during winter dormancy | Pet-safe |
| Chagual | Direct sun (at least 4-6 hours) | every 7–14 days in summer, rarely in winter | Pet-safe |
| Chain Pleurothallis | Bright indirect light (just back from a sunny window) | Every 2-3 days; do not allow to dry completely | Pet-safe |
| Chamaerops Humilis 'Vulcano' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 7-14 days in summer | Pet-safe |
| Chamaerops Humilis Cerifera | Direct sun (at least 4-6 hours) | When the top few cm of soil are dry; drought-tolerant once established | Pet-safe |
| 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 |
| Chantenay Carrot | Direct sun (at least 4-6 hours) | Every 3–5 days; good drought tolerance once established | Pet-safe |
| Chantenay Carrot | Direct sun (at least 4-6 hours) | Moderate and even; water weekly, more in dry spells once roots are swelling | Pet-safe |
| Chantilly Peach snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil evenly moist but not waterlogged | Pet-safe |
| Chaparensis Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in cooler seasons | Pet-safe |
| Charlotte Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat | Pet-safe |
| Chayote | Direct sun (at least 4-6 hours) | 2–3 times per week; keep consistently moist | Pet-safe |
| Cherokee Chief Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering; more in summer drought | Pet-safe |
| Cherry Belle Radish | Direct sun (at least 4-6 hours) | Every 2–3 days | Pet-safe |
| Cherry of the Río Grande | Direct sun (at least 4-6 hours) | Water thoroughly 2–3 times per week in summer; reduce to once every 7–10 days in winter. | Pet-safe |
| Chervil | Bright indirect light (just back from a sunny window) | Keep evenly moist; water every 2-4 days, more in warm spells | Pet-safe |
| Chestnut 'Colossal' | Direct sun (at least 4-6 hours) | Deep watering every 7-14 days through summer in dry climates | Pet-safe |
| Chickpea | Direct sun (at least 4-6 hours) | Every 7–14 days; deeply but infrequently | Pet-safe |
| Chicory | Direct sun (at least 4-6 hours) | Every 5–7 days once established; weekly during dry spells | Pet-safe |
| Chilean Bamboo | Bright indirect light (just back from a sunny window) | Weekly during establishment; twice weekly in dry summer heat | Pet-safe |
| Chilean Hard Fern | Medium indirect light (a couple of metres from a window) | Keep consistently moist — water when the top 1-2 cm of soil is dry, typically every 5-7 days indoors | 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 Arborvitae | Direct sun (at least 4-6 hours) | Moderate — water regularly until established; drought-tolerant once established | Pet-safe |
| Chinese astilbe | Medium indirect light (a couple of metres from a window) | Once or twice per week; more in hot weather | Pet-safe |
| Chinese Chestnut | Direct sun (at least 4-6 hours) | Water deeply every 7-14 days while establishing and through summer drought as nuts fill | Pet-safe |
| Chinese Douglas Fir | Direct sun (at least 4-6 hours) | Weekly when young; every 2 weeks once established | Pet-safe |
| Chinese Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (spring–summer); sparingly in winter | Pet-safe |
| Chinese Dwarf Bamboo | Medium indirect light (a couple of metres from a window) | Once or twice per week during the growing season; reduce in winter | Pet-safe |
| Chinese Hemlock | Bright indirect light (just back from a sunny window) | Every 1–2 weeks when young; every 2–3 weeks once established | Pet-safe |
| Chinese Holly Fern | Low light (north window or shaded room) | Every 6–10 days in summer, every 12–16 days in winter | Pet-safe |
| Chinese Larch | Direct sun (at least 4-6 hours) | Regular during establishment and growing season; reduced in dormancy | Pet-safe |
| Chinese Pistachio | Direct sun (at least 4-6 hours) | Weekly while establishing (first 1-2 years), then deep watering every 2-3 weeks in drought | Pet-safe |
| Chinese Timber Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in the shooting season (spring); weekly otherwise | Pet-safe |
| Chinese Tupelo | Bright indirect light (just back from a sunny window) | Regularly during establishment; once or twice a week in dry spells | Pet-safe |
| Chinese Weeping Cypress | Direct sun (at least 4-6 hours) | Regular during establishment; drought-tolerant once mature | Pet-safe |
| Chioggia Beet | Direct sun (at least 4-6 hours) | About 25 mm (1 in) per week, keeping soil evenly moist | Pet-safe |
| Chocolate Soldier episcia | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season, every 10–14 days in winter | Pet-safe |
| Chojuro Asian pear | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce to fortnightly in autumn and winter | Pet-safe |
| Christmas Jewels Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup weekly; water soil every 2–3 weeks | Pet-safe |
| Christmas Tree Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 14-21 days in the growing season and once a month or less in winter | Pet-safe |
| Chusan Palm | Bright indirect light (just back from a sunny window) | Weekly in summer, monthly in winter | Pet-safe |
| Cigarette Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through early spring; none or near-none in summer | Pet-safe |
| Cilician Fir | Direct sun (at least 4-6 hours) | Moderate; drought-tolerant once established | Pet-safe |
| Cinderella Miniature Rose | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water when the top 2-3 cm is dry, roughly twice weekly and more in heat | Pet-safe |
| Cinnamon Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in warm weather | Pet-safe |
| Cinnamon Bunny Ears | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 2-3 weeks in summer; nearly dry in winter | Pet-safe |
| Cinnamon Fern | Medium indirect light (a couple of metres from a window) | 2-3 times per week; keep consistently moist | Pet-safe |
| Cissus rhombifolia 'Ellen Danica' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Clamshell Orchid | Medium indirect light (a couple of metres from a window) | Every 5–7 days; allow the mix to almost dry before rewetting | Pet-safe |
| Clamshell Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; every 10–14 days in winter | Pet-safe |
| Clara Fan Palm | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is completely dry, roughly every 14-21 days in summer | Pet-safe |
| Clarke's Cranesbill | Bright indirect light (just back from a sunny window) | Regularly during establishment; once established, once a week in dry periods | Pet-safe |
| Clary Sage | Direct sun (at least 4-6 hours) | When soil is dry several centimetres down, roughly every 7-10 days once established | Pet-safe |
| Clasping Sage | Bright indirect light (just back from a sunny window) | Weekly to fortnightly | Pet-safe |
| Claw Sage | Direct sun (at least 4-6 hours) | Water when the top 3–5 cm of soil feels dry | Pet-safe |
| Cleft Phlox | Direct sun (at least 4-6 hours) | Every 10–14 days when establishing; monthly once established in dry periods | Pet-safe |
| Cleveland Sage | Direct sun (at least 4-6 hours) | Very infrequent after establishment — once monthly or less in summer | Pet-safe |
| Cliff African violet | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Cliff Date Palm | Direct sun (at least 4-6 hours) | Water when the top 4-5 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Cliff Holly Fern | Low light (north window or shaded room) | Every 7–14 days; allow top half of soil to dry between waterings | Pet-safe |
| Clouds of Perfume Woodland Phlox | Medium indirect light (a couple of metres from a window) | Weekly during the growing season; do not allow soil to dry out in summer | Pet-safe |
| Clowes' Miltonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of the mix feels dry, roughly every 5-7 days in summer | Pet-safe |
| Clumping Bamboo | Bright indirect light (just back from a sunny window) | Twice to three times per week during establishment; weekly once established | Pet-safe |
| Clumping Blue Bamboo | Bright indirect light (just back from a sunny window) | Consistently moist throughout the growing season; water every 5–7 days or as needed to keep soil from drying out | Pet-safe |
| Cluster-Headed Mezobromelia | Medium indirect light (a couple of metres from a window) | Keep central tank filled; water substrate when top inch is dry, approximately every 7-10 days | Pet-safe |
| Clustered 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 Mountain Mint | Bright indirect light (just back from a sunny window) | Moderate to high — prefers consistently moist soil | 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 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 |
| Cochinchina Lady Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; every 10–14 days in winter | Pet-safe |
| Cockscomb | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-6 days in summer | Pet-safe |
| Coconut Palm | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in heat, never letting it dry out fully | Pet-safe |
| Coconut Thyme | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Coin-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; reduce to every 2–3 weeks in winter | Pet-safe |
| Cole's Prostrate Hemlock | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks; do not allow soil to dry out | Pet-safe |
| Column Aubrieta | Direct sun (at least 4-6 hours) | Weekly during spring growth; very sparingly in summer | Pet-safe |
| Columnae Snow-in-Summer | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Columnar Douglas Fir | Direct sun (at least 4-6 hours) | Moderate during establishment; reduced once established | Pet-safe |
| Comb Speedwell | Direct sun (at least 4-6 hours) | Every 2–3 weeks; very drought-tolerant | Pet-safe |
| Comb-Spined 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; reduce to once every 5-6 weeks in winter | Pet-safe |
| Common Bamboo | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week; daily in hot or dry conditions | 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 Evening Primrose | Direct sun (at least 4-6 hours) | Every 10–14 days; highly tolerant of drought once established | Pet-safe |
| 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 Goldfish Plant | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry | Pet-safe |
| Common Heather | Direct sun (at least 4-6 hours) | Water weekly in dry spells for the first two seasons; established plants are moderately drought-tolerant | Pet-safe |
| Common Iceplant | Direct sun (at least 4-6 hours) | Regularly when young; sparingly once established | Pet-safe |
| Common immortelle | Direct sun (at least 4-6 hours) | Every 7–10 days; allow soil to dry between waterings | Pet-safe |
| Common Jasmine | Direct sun (at least 4-6 hours) | Water regularly while establishing and in dry spells; water when the top few cm of soil dries | Pet-safe |
| Common Lime | Direct sun (at least 4-6 hours) | Regular in first 2–3 years; occasional once established | Pet-safe |
| Common Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–4 days; keep soil evenly moist | Pet-safe |
| Common Mallow | Direct sun (at least 4-6 hours) | Low once established | Pet-safe |
| Common Polypody | Medium indirect light (a couple of metres from a window) | Every 10–14 days; tolerates extended dry periods once established | Pet-safe |
| Common Quaking Grass | Direct sun (at least 4-6 hours) | Rarely; drought-tolerant once established | Pet-safe |
| Common Saltmarsh Grass | Direct sun (at least 4-6 hours) | Tidal — periodic saltwater flooding | Pet-safe |
| Common Sea Lavender | Direct sun (at least 4-6 hours) | Low to moderate — drought-tolerant once established; tolerates periodic waterlogging | Pet-safe |
| Common Spike-rush | Direct sun (at least 4-6 hours) | Permanently aquatic to waterlogged; plant at 0–30 cm (0–12 in) water depth | Pet-safe |
| Common teasel | Direct sun (at least 4-6 hours) | Rarely needs supplemental watering once established; water seedlings regularly | Pet-safe |
| Common Tussock Grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; tolerates extended dry periods | Pet-safe |
| Commutatum Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Compact 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 Oregano | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 14–21 days in winter | Pet-safe |
| Compact Plume Japanese Cedar | Bright indirect light (just back from a sunny window) | Regularly throughout the growing season; reduce slightly in winter | Pet-safe |
| Compact Thyme | Direct sun (at least 4-6 hours) | Every 7–14 days outdoors; 10–14 days indoors | Pet-safe |
| Compacta Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days | Pet-safe |
| Compass Plant | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | Pet-safe |
| Compressed Peperomia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks (allow compost to dry substantially between waterings) | Pet-safe |
| Compton's Gibbaeum | Direct sun (at least 4-6 hours) | Every 2–4 weeks in autumn and spring (active growth); withheld or near-dry in summer and reduced in winter | Pet-safe |
| 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 |
| Congo cockatoo impatiens | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil evenly moist | Pet-safe |
| Constricted Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in summer heat; every 2–3 days in cooler months | Pet-safe |
| Cook Pine | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| 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 |
| 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 Bark Maple | Bright indirect light (just back from a sunny window) | When the top 3–5 cm of soil is dry, roughly every 5–7 days in summer; reduce in winter | Pet-safe |
| Coral bells | Medium indirect light (a couple of metres from a window) | Weekly during active growth; reduce in autumn and winter | Pet-safe |
| Coral Bells 'Caramel' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, around weekly in growth; more in heat and for containers | Pet-safe |
| Coral Bells 'Caramel' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil feels dry, roughly every 5-7 days during active growth | Pet-safe |
| Coral 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, roughly weekly in growth; more in heat and for container plants | Pet-safe |
| Coral Bells 'Palace Purple' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly in growth; more in heat and for container plants | Pet-safe |
| Coral Bells 'Palace Purple' | 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 Berry Bromeliad | Bright indirect light (just back from a sunny window) | Keep central cup filled; water soil every 2–3 weeks | Pet-safe |
| Coral Berry Bromeliad | Bright indirect light (just back from a sunny window) | Keep the central cup filled; water compost every 10-14 days | Pet-safe |
| Coreopsis 'Jethro Tull' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Coreopsis 'Limerock Ruby' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Coreopsis 'Mercury Rising' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Coreopsis 'Moonbeam' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly to establish, then sparingly | Pet-safe |
| Coreopsis 'Moonbeam' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days; very drought-tolerant once established | Pet-safe |
| Coreopsis 'Route 66' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Coreopsis 'Ruby Sunset' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Coreopsis 'Sienna Sunset' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Coreopsis 'Sunkiss' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Coreopsis 'Zagreb' | Direct sun (at least 4-6 hours) | Water to establish, then only in extended drought; drought-tolerant once settled | Pet-safe |
| Coreopsis grandiflora 'Early Sunrise' | Direct sun (at least 4-6 hours) | Water to establish, then only during drought; drought-tolerant once settled | Pet-safe |
| Cork-Stemmed Passionflower | Direct sun (at least 4-6 hours) | Once or twice a week until established; less once mature | Pet-safe |
| Corn-Leaf Pitcairnia | Medium indirect light (a couple of metres from a window) | every 5–7 days in summer, every 10–14 days in winter | Pet-safe |
| Cornelia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in heat | Pet-safe |
| Cornelian Cherry Dogwood | Direct sun (at least 4-6 hours) | Water weekly while establishing; drought-tolerant once mature | Pet-safe |
| Cornflower | Direct sun (at least 4-6 hours) | Low to moderate — water during establishment only | Pet-safe |
| Cornish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once settled | Pet-safe |
| Cornish Heath Mrs D.F. Maxwell | Direct sun (at least 4-6 hours) | Water weekly during dry spells, especially in the first two years | Pet-safe |
| Cornus kousa 'Miss Satomi' | Direct sun (at least 4-6 hours) | Water deeply weekly while establishing; supplement in dry spells | Pet-safe |
| Coryphantha macromeris | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; keep dry in winter | Pet-safe |
| Coryphantha vivipara | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; none in winter | Pet-safe |
| Cosmos | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Cosmos 'Sensation' | Direct sun (at least 4-6 hours) | Water young plants until established, then only in prolonged drought; drought-tolerant once rooted | Pet-safe |
| Cosmos bipinnatus 'Picotee' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cosmos bipinnatus 'Sensation White' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cosmos sulphureus 'Bright Lights' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cosmos sulphureus 'Klondike' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| Costa Rica Pitaya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 2-4 weeks in winter | Pet-safe |
| Costa Rican Goldfish Vine | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of mix has dried; every 5–8 days in summer, every 10–14 days in winter | Pet-safe |
| Cotton Candy Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Courgette | Direct sun (at least 4-6 hours) | Water generously and consistently; deeply every 2-3 days in summer | Pet-safe |
| Cowpea | Direct sun (at least 4-6 hours) | Once or twice per week during dry spells | Pet-safe |
| Cowslip Orchid | Bright indirect light (just back from a sunny window) | Lightly during autumn to spring growth; completely dry during summer dormancy | Pet-safe |
| Cramer's Amazon celosia | Direct sun (at least 4-6 hours) | Every 3–5 days | Pet-safe |
| Crataegus laevigata 'Paul's Scarlet' | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are very drought-tolerant | Pet-safe |
| Crataegus persimilis 'Prunifolia' | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are drought-tolerant | Pet-safe |
| Creeping broad-leaf sedge | Medium indirect light (a couple of metres from a window) | Keep evenly and consistently moist; never allow to dry out | Pet-safe |
| Creeping Coin Peperomia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; every 14–21 days in winter | Pet-safe |
| Creeping Globe Daisy | Direct sun (at least 4-6 hours) | Every 2–3 weeks when actively growing; minimal in winter | Pet-safe |
| Creeping Lemon Thyme | Direct sun (at least 4-6 hours) | When the top few cm of soil are dry, roughly every 7-10 days | Pet-safe |
| Creeping Little Bluestem | Direct sun (at least 4-6 hours) | Minimal once established; rainfall usually sufficient on native sites | Pet-safe |
| Creeping Rosemary | Direct sun (at least 4-6 hours) | Every 7–14 days; allow soil to dry out between waterings | Pet-safe |
| Creeping Savory | Direct sun (at least 4-6 hours) | Every 10–14 days during dry spells; minimal in winter | Pet-safe |
| Creeping Speedwell | Bright indirect light (just back from a sunny window) | Moderate; water when the top 2–3 cm of soil begins to dry | Pet-safe |
| Creeping Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days once established; minimal in cool seasons | Pet-safe |
| Creeping Thyme | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-14 days once established | Pet-safe |
| Creeping Winter Savory | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-12 days; less once established | Pet-safe |
| Crescent-Leaved Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–4 days during active growth; reduce to every 5–6 days in winter | Pet-safe |
| Crested Christmas Fern | Low light (north window or shaded room) | Every 7–10 days; allow top 2–3 cm to dry between waterings | Pet-safe |
| Crested Hart's Tongue Fern | Medium indirect light (a couple of metres from a window) | Weekly in the growing season, every 2–3 weeks in winter | Pet-safe |
| Crested Silver Lady Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days in spring and summer | Pet-safe |
| Cretan Date Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Crimean Linden | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2–3 weeks in dry summers once mature | Pet-safe |
| Crimson Portea | Bright indirect light (just back from a sunny window) | Weekly in growth; every 10–14 days in winter | Pet-safe |
| Crispum Hart's Tongue Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days; keep evenly moist | Pet-safe |
| 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 | Direct sun (at least 4-6 hours) | Frequently — keep soil consistently moist to wet | Pet-safe |
| Crossandra (firecracker flower) | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil starts to dry, often every 4-7 days in growth | Pet-safe |
| Crowberry | Direct sun (at least 4-6 hours) | Moderate; more frequent in first year, drought-tolerant once established | Pet-safe |
| Crown Bamboo | Bright indirect light (just back from a sunny window) | 2-3 times per week during growing season; weekly in cooler months | Pet-safe |
| Crown Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth; none from late autumn through winter | Pet-safe |
| Crown Staghorn Fern | Bright indirect light (just back from a sunny window) | Twice weekly in the growing season; once every 10–14 days in cooler months | Pet-safe |
| Crown Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Cryptanthus acaulis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Cryptanthus bromelioides | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly weekly | Pet-safe |
| Crystal Apple Cucumber | Direct sun (at least 4-6 hours) | Every 2-3 days, keeping soil evenly moist; daily in hot, dry weather | Pet-safe |
| Crystal White narrowleaf zinnia | Direct sun (at least 4-6 hours) | Every 5–7 days; drought tolerant once established | Pet-safe |
| Ctenanthe Compressa | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Ctenanthe Oppenheimiana 'Tricolor' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Cuban 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 |
| Cuban Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Cuban Petticoat Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; every 3-5 weeks in winter | Pet-safe |
| Cuban Royal Palm | Direct sun (at least 4-6 hours) | Every 5–7 days when young; established trees weekly or rely on rainfall | Pet-safe |
| Cucumber Tree Magnolia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks when established; more frequently during active growth in summer | Pet-safe |
| Cupcake Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Cupcakes Blush cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; drought tolerant once established | Pet-safe |
| Curiosity Plant | Direct sun (at least 4-6 hours) | When the mix is dry, about every 2-3 weeks in summer; minimal in winter | Pet-safe |
| Curly Kale | Direct sun (at least 4-6 hours) | Water deeply weekly; more in dry spells, every 4-7 days | Pet-safe |
| Curly Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days during growth; every 10–14 days during winter rest | Pet-safe |
| Curry plant | Direct sun (at least 4-6 hours) | Every 10–14 days; allow soil to dry between waterings | Pet-safe |
| Curved Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to dry between waterings) | Pet-safe |
| Cushaw Squash | Direct sun (at least 4-6 hours) | 1–2 times per week once established; more frequent during fruit set in very hot weather | Pet-safe |
| Cushion Draba | Direct sun (at least 4-6 hours) | Sparingly; soil must dry between waterings | Pet-safe |
| Cusp Blazing Star | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established; avoid irrigation in winter | Pet-safe |
| Custard Biriba | Direct sun (at least 4-6 hours) | 2–3 times per week in growing season; reduce in cooler months | Pet-safe |
| 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 coneflower | Direct sun (at least 4-6 hours) | Twice weekly during establishment; weekly or more in dry spells once established | Pet-safe |
| Cutleaf Fleabane | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; very little in winter | Pet-safe |
| Cutleaf Toothwort | Medium indirect light (a couple of metres from a window) | Moderate during the active growth period (March–May); none needed once dormant in summer. | Pet-safe |
| Cylindra Beetroot | Direct sun (at least 4-6 hours) | Keep evenly moist; water weekly, increasing in dry weather | Pet-safe |
| Cylindric Blazing Star | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; regular watering during establishment | Pet-safe |
| Cymbidium 'Red Beauty' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in winter | Pet-safe |
| Cymbidium 'Sarah Jean' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, about every 5-7 days, drier in winter | Pet-safe |
| Cymbidium 'Showgirl' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in winter | Pet-safe |
| Cymbidium devonianum | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; reduce to every 10-14 days in winter | Pet-safe |
| Cymbidium erythrostylum | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; every 10-14 days in winter | Pet-safe |
| Cymbidium Golden Elf 'Sundust' | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; every 10-14 days in cooler months | Pet-safe |
| Cyperus Sedge | Bright indirect light (just back from a sunny window) | Permanently wet; shallow water up to 15 cm deep | Pet-safe |
| Dahurian Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; minimal once established | Pet-safe |
| Daikon Radish | Direct sun (at least 4-6 hours) | Every 2–3 days (keep evenly moist) | Pet-safe |
| Daikon Radish | Direct sun (at least 4-6 hours) | Steady moisture, about 25 mm (1 inch) per week | Pet-safe |
| Dalit Durian | Direct sun (at least 4-6 hours) | Daily to every other day in dry spells; less frequent during rainy seasons | Pet-safe |
| Dalmatian Cranesbill | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; minimal in winter | Pet-safe |
| Dalstroem's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Daily misting or watering; roots must remain continuously moist but never waterlogged | Pet-safe |
| Danica Globe Arborvitae | Bright indirect light (just back from a sunny window) | Moderate — keep soil evenly moist, especially in heat | Pet-safe |
| Dark Beauty heather | Direct sun (at least 4-6 hours) | Weekly during the first season; as needed once established | Pet-safe |
| Dark Velvet Kohleria | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; every 10–14 days in winter | Pet-safe |
| Darley Dale heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Darley Dale Heath Furzey | Direct sun (at least 4-6 hours) | Water weekly in dry spells; reduce in winter unless the soil is very dry | Pet-safe |
| 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 |
| Dazzler cosmos | Direct sun (at least 4-6 hours) | Weekly until established; every 10–14 days once established | Pet-safe |
| Debbie Graptoveria | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| 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 |
| Deer Grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; monthly or less in cool months | Pet-safe |
| Delicata Squash | Direct sun (at least 4-6 hours) | Every 2–3 days (more in heat) | Pet-safe |
| 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 |
| Delta Vygie | Direct sun (at least 4-6 hours) | When the soil is fully dry, approximately every 10-14 days in the growing season; very sparingly once a month in winter | Pet-safe |
| Dendrobium phalaenopsis | Bright indirect light (just back from a sunny window) | When the mix is approaching dry, roughly every 5-7 days in growth | Pet-safe |
| Dense Trichodiadema | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn and spring flowering seasons; reduced to monthly or less in summer and winter | Pet-safe |
| Deparia acrostichoides | Low light (north window or shaded room) | Keep evenly moist; water when the top 2 cm starts to dry, roughly every 4-7 days in growth | Pet-safe |
| Desert Bromeliad | Direct sun (at least 4-6 hours) | every 14–21 days in summer, rarely in winter | Pet-safe |
| Desert Privet Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Deutzia 'Elegantissima' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season | Pet-safe |
| Deutzia gracilis | Direct sun (at least 4-6 hours) | Weekly in the first year, then during dry spells | Pet-safe |
| Deutzia scabra 'Plena' | Direct sun (at least 4-6 hours) | Weekly while establishing, then in dry spells | Pet-safe |
| Deutzia x elegantissima 'Rosealind' | Direct sun (at least 4-6 hours) | Weekly while establishing, then during droughts | Pet-safe |
| DeVoss Codonanthe | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow top 1–2 cm of medium to dry between waterings | Pet-safe |
| Dewberry | Direct sun (at least 4-6 hours) | Weekly in dry spells; fairly drought-tolerant once established | Pet-safe |
| Deyke's Wax Plant | Medium indirect light (a couple of metres from a window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Diablo Orange Cosmos | Direct sun (at least 4-6 hours) | When the top 3–5 cm of soil is dry, roughly every 7–10 days | Pet-safe |
| Diapensia-Like Saxifrage | Direct sun (at least 4-6 hours) | Very low — water sparingly in spring and summer; virtually none in winter | Pet-safe |
| Diascia 'Wink Coral Pink' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Diascia barberae 'Piccadilly' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Dill | Direct sun (at least 4-6 hours) | Twice-weekly watering | Pet-safe |
| Dilys Cranesbill | Medium indirect light (a couple of metres from a window) | Water once a week during dry spells; largely self-sufficient once established in UK conditions | Pet-safe |
| 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 puberulus | Direct sun (at least 4-6 hours) | Lightly in late-summer to autumn growth; near-dry the rest of the year | 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 |
| Disk Staghorn Fern | Bright indirect light (just back from a sunny window) | Soak when the root mass is dry, roughly every 10-14 days | Pet-safe |
| Dog Rose | Direct sun (at least 4-6 hours) | Weekly during the first growing season; rarely once established | Pet-safe |
| 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 Blazing Star | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; moderate during first season | Pet-safe |
| Dotted Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Double Click Cranberries Cosmos | Direct sun (at least 4-6 hours) | When the top 3–5 cm of soil is dry, roughly every 7 days in summer | Pet-safe |
| Double Click Snow Puff cosmos | Direct sun (at least 4-6 hours) | Weekly once established; more frequent in heat | Pet-safe |
| Double Knock Out Rose | Direct sun (at least 4-6 hours) | About 2.5 cm weekly, deep watering | Pet-safe |
| Doublefile Viburnum 'Mariesii' | Direct sun (at least 4-6 hours) | Deep soak when the top 5 cm of soil dries, roughly weekly in the first two seasons | Pet-safe |
| 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 Wax Plant | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; every 14-21 days in autumn and winter | Pet-safe |
| Downy Yellow Violet | Medium indirect light (a couple of metres from a window) | Regular; keep evenly moist | Pet-safe |
| Dragon-Head Bamboo | Medium indirect light (a couple of metres from a window) | Twice weekly during the growing season; weekly in cool, wet periods | Pet-safe |
| Dragon's Blood Stonecrop | Direct sun (at least 4-6 hours) | When soil is dry, about every 10-14 days in summer; minimal in winter | Pet-safe |
| Druce's Cranesbill | Bright indirect light (just back from a sunny window) | Water during establishment; once established largely drought-tolerant | Pet-safe |
| Drumstick Tree | Direct sun (at least 4-6 hours) | Weekly during active growth; monthly in cool/dry rest period | Pet-safe |
| Dryopteris affinis 'Cristata' | Low light (north window or shaded room) | Keep soil consistently moist; water deeply during dry spells, roughly weekly in summer | Pet-safe |
| Dryopteris championii | Low light (north window or shaded room) | Keep evenly moist; water deeply in dry spells, roughly weekly in summer heat | Pet-safe |
| Dryopteris goldiana | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Dryopteris tokyoensis | Low light (north window or shaded room) | Keep constantly moist to wet; never allow to dry out, watering as often as needed in summer | Pet-safe |
| Duke Blueberry | Direct sun (at least 4-6 hours) | Keep soil consistently moist, roughly every 2-4 days in summer; more in fruiting heat | Pet-safe |
| Durat's Air Plant | Bright indirect light (just back from a sunny window) | Mist thoroughly 2–3 times per week; a 20-minute soak once a week is sufficient in summer. Reduce to every 10–14 days in winter. | Pet-safe |
| Dutch medlar | Direct sun (at least 4-6 hours) | Regular until established; moderate thereafter | Pet-safe |
| Dutch Staghorn Fern | Bright indirect light (just back from a sunny window) | When the mount feels dry or the shield fronds are crisp, soak every 7-14 days in growing season | Pet-safe |
| Dwarf Alberta Spruce | Direct sun (at least 4-6 hours) | Every 5-7 days when establishing; deep soak when the top few cm of soil dry out | Pet-safe |
| Dwarf Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer, reduce in winter | Pet-safe |
| Dwarf Blue Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days when young; deep, infrequent watering once established | Pet-safe |
| Dwarf Cape Primrose | Bright indirect light (just back from a sunny window) | every 5–8 days in the growing season, every 10–14 days in winter | Pet-safe |
| Dwarf Caribbean gesneria | Bright indirect light (just back from a sunny window) | Every 4–7 days; do not allow to dry out | Pet-safe |
| Dwarf Cavendish Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil is dry, often every 2-4 days in active growth | Pet-safe |
| Dwarf Cedar of Lebanon | Direct sun (at least 4-6 hours) | Weekly when young; bi-weekly once established | Pet-safe |
| Dwarf 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 Fan Palm | Bright indirect light (just back from a sunny window) | Every 7–10 days during growing season; reduce to fortnightly in cooler months | Pet-safe |
| Dwarf Fernleaf Bamboo | Medium indirect light (a couple of metres from a window) | Once or twice per week during the growing season; reduce significantly in winter | Pet-safe |
| Dwarf 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 Greenstripe Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer, once per week in winter | Pet-safe |
| Dwarf Indigo Bush | Direct sun (at least 4-6 hours) | Establish with occasional deep watering for the first season; essentially no supplemental water needed once the taproot is developed | Pet-safe |
| Dwarf Korean Lilac | Direct sun (at least 4-6 hours) | Weekly while establishing, then every 1-2 weeks in dry spells | Pet-safe |
| Dwarf Lady's Mantle | Bright indirect light (just back from a sunny window) | Weekly during the growing season; established plants tolerate some drought | Pet-safe |
| Dwarf Lewisia | Direct sun (at least 4-6 hours) | Moderate during spring growth; completely dry in summer | Pet-safe |
| Dwarf nasturtium | Direct sun (at least 4-6 hours) | Every 7–10 days; allow soil to partially dry between waterings | 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 Sugar Palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; every 14 days in winter | Pet-safe |
| Dwarf 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 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 Whitestripe Bamboo | Bright indirect light (just back from a sunny window) | Consistently moist; water every 4–6 days during the growing season, reducing in autumn and winter | Pet-safe |
| Dwarf Windmill Palm | Direct sun (at least 4-6 hours) | Weekly while establishing; little supplemental water once mature | Pet-safe |
| Dyckia 'Cherry Cola' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, sparingly in winter | Pet-safe |
| Dyckia brevifolia | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Dyckia fosteriana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growth, rarely in winter | Pet-safe |
| Dyckia marnier-lapostollei | Direct sun (at least 4-6 hours) | When the soil is bone dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Dyckia velascana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growth, minimal in winter | Pet-safe |
| Dyer's Air Plant | Medium indirect light (a couple of metres from a window) | Daily misting plus weekly soak | Pet-safe |
| Dyer's 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 |
| Eared Abutilon | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season, every 10–14 days in winter | Pet-safe |
| Eared Sage | Bright indirect light (just back from a sunny window) | Weekly in summer, less in winter | Pet-safe |
| Earliglow Strawberry | Direct sun (at least 4-6 hours) | Every 2–3 days in active growth; weekly when dormant | Pet-safe |
| Early Goldenrod | Direct sun (at least 4-6 hours) | Low to moderate — drought-tolerant once established | 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 |
| East African Savory | Direct sun (at least 4-6 hours) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| East Himalayan Fir | Direct sun (at least 4-6 hours) | Regularly during establishment; drought-tolerant once mature | Pet-safe |
| Easter Egg Radish | Direct sun (at least 4-6 hours) | About 25 mm (1 in) per week, keeping soil constantly moist | 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 |
| Easter Lily Cactus Clump | 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 |
| Eastern Bee Balm | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 1–2 weeks once established | Pet-safe |
| Eastern Bee Balm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season | Pet-safe |
| Eastern Hemlock | Medium indirect light (a couple of metres from a window) | Weekly during establishment; regular moisture required long-term | Pet-safe |
| Eastern Prickly Pear | Direct sun (at least 4-6 hours) | Sparingly when soil is dry; established plants tolerate long drought, every 2-4 weeks at most in summer | Pet-safe |
| Eaton's Firecracker | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; minimal winter irrigation | Pet-safe |
| Echeveria | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer | Pet-safe |
| Echeveria 'Afterglow' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria 'Blue Atoll' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Chroma' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and much less in winter | Pet-safe |
| Echeveria 'Cubic Frost' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Dondo' | Direct sun (at least 4-6 hours) | When the soil is fully dry, around every 10-14 days in summer, sparingly in winter | Pet-safe |
| Echeveria 'Duchess of Nürnberg' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Ice Green' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Echeveria 'Lola' | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in the growing season; much less in winter | Pet-safe |
| Echeveria 'Lola' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Echeveria 'Meridian' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Echeveria 'Minima' | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 1-2 weeks in summer | Pet-safe |
| Echeveria 'Mira' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and rarely in winter | Pet-safe |
| Echeveria 'Neon Breakers' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria 'Orion' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Echeveria 'Perle d'Azur' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, much less in winter | Pet-safe |
| Echeveria 'Perle von Nurnberg' | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth; less in winter | Pet-safe |
| Echeveria 'Perle von Nürnberg' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Raindrops' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria 'Tarantula' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, much less in winter | Pet-safe |
| Echeveria 'Violet Queen' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria agavoides | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria agavoides 'Ebony' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria colorata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria gibbiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria harmsii | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria lilacina | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Pet-safe |
| Echeveria pallida | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and much less in winter | Pet-safe |
| Echeveria pulidonis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria setosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria shaviana | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Echeveria strictiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, sparingly in winter | Pet-safe |
| Echeveria subsessilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and monthly in winter | Pet-safe |
| Echidna Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 14-21 days in the growing season | Pet-safe |
| Echinacea 'After Midnight' | Direct sun (at least 4-6 hours) | Once or twice weekly during establishment; once every 10–14 days when fully established | Pet-safe |
| Echinacea 'Baby White Swan' | Direct sun (at least 4-6 hours) | Once or twice a week in year one; once every 10–14 days when established | Pet-safe |
| Echinacea 'Cheyenne Spirit' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly while establishing, then mainly in drought | Pet-safe |
| Echinacea 'Harvest Moon' | Direct sun (at least 4-6 hours) | Every 7-10 days once established; weekly during the first season | Pet-safe |
| Echinacea 'Magnus' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Pet-safe |
| Echinacea 'Pink Double Delight' | Direct sun (at least 4-6 hours) | Every 7-10 days once established; more frequently during the first growing season | 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 |
| Echinacea 'Ruby Star' | Direct sun (at least 4-6 hours) | Once or twice a week during the first growing season; deeply once a week or less when established | Pet-safe |
| Echinacea 'Tomato Soup' | Direct sun (at least 4-6 hours) | Once or twice a week during the first growing season; every 10–14 days once established | Pet-safe |
| Echinacea 'Virgin' | Direct sun (at least 4-6 hours) | Once or twice a week for the first growing season; once weekly to once every two weeks when established | Pet-safe |
| Echinacea 'White Swan' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly until established | Pet-safe |
| Echinocereus coccineus | Direct sun (at least 4-6 hours) | When soil is bone-dry in growth, roughly every 10-14 days; none over winter | Pet-safe |
| Echinocereus engelmannii | Direct sun (at least 4-6 hours) | When soil is fully dry in growing season, about every 10-14 days; keep dry in winter | Pet-safe |
| Echinocereus pectinatus | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Echinops bannaticus 'Taplow Blue' | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water new plants until settled | Pet-safe |
| Echinops ritro | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water new plants until rooted | Pet-safe |
| Echinops ritro 'Veitch's Blue' | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water young plants until rooted | Pet-safe |
| Echinopsis huascha | Direct sun (at least 4-6 hours) | Soak-and-dry; roughly every 10-14 days in active growth, none in winter | Pet-safe |
| Edamame | Direct sun (at least 4-6 hours) | Twice per week during pod fill; weekly otherwise | Pet-safe |
| 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 |
| Edith's Air Plant | Direct sun (at least 4-6 hours) | Every 2–3 days by misting | Pet-safe |
| Egerton's Swan Orchid | Bright indirect light (just back from a sunny window) | Water generously every 3-5 days during active growth; reduce to once every 2-3 weeks once leaves drop and cease almost entirely in mid-winter rest | Pet-safe |
| Eitape Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Elegant clarkia | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Pet-safe |
| 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 |
| Elephant bush | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Elephant Ears Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–14 days in summer; reduce to once a month or less in winter | Pet-safe |
| Elfin Thyme | Direct sun (at least 4-6 hours) | Every 10–21 days; established plants often need no supplemental watering outdoors | Pet-safe |
| Elfin Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days; extremely drought-tolerant once established | Pet-safe |
| Elijah Blue Fescue | Direct sun (at least 4-6 hours) | Every 10–14 days (established); weekly when newly planted | Pet-safe |
| Emerald Blue Creeping Phlox | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; drought-tolerant once established (second year onward) | Pet-safe |
| Emerald Queen Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days in spring and summer | Pet-safe |
| 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 |
| Encrusted Saxifrage | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; rarely in winter | Pet-safe |
| Engelmann Spruce | Direct sun (at least 4-6 hours) | Regular — keep soil consistently moist, especially in the first 3 years after planting | Pet-safe |
| Engelmann's Prickly Pear | Direct sun (at least 4-6 hours) | Deeply but infrequently when soil is dry, every 2-4 weeks in summer; keep dry in winter | Pet-safe |
| English Thyme | Direct sun (at least 4-6 hours) | Every 7–10 days when established; more frequently for newly planted specimens | Pet-safe |
| 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 |
| Episcia 'Moss Agate' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Episcia 'Silver Skies' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, about every 5-7 days | Pet-safe |
| Episcia reptans | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Erman's Birch | Direct sun (at least 4-6 hours) | Regular watering for first 2–3 years; occasional once established | Pet-safe |
| 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 |
| Escobar's Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep medium consistently moist | Pet-safe |
| Espostoa lanata | Direct sun (at least 4-6 hours) | When the top few centimetres are dry, about every 2 weeks in summer; sparingly in winter | Pet-safe |
| Espostoa melanostele | Direct sun (at least 4-6 hours) | When the upper soil is dry, about every 2 weeks in summer; sparingly in winter | Pet-safe |
| 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 |
| Eternal Flame Plant | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; every 10-14 days in winter | Pet-safe |
| European Ash | Direct sun (at least 4-6 hours) | Moderate; deep watering during drought in first 3 years | Pet-safe |
| European feather grass | Direct sun (at least 4-6 hours) | Weekly in the first growing season; only during extreme drought thereafter | Pet-safe |
| European Hazel 'Cosford' | Direct sun (at least 4-6 hours) | Water young plants every 7-10 days in dry weather; established bushes need water mainly during nut fill in summer | Pet-safe |
| European Hazel 'Nottingham Prolific' | Direct sun (at least 4-6 hours) | Water young bushes every 7-10 days when dry; established plants mainly need water during summer nut fill | Pet-safe |
| European Hazel 'Witchford' | Direct sun (at least 4-6 hours) | Water young plants every 7-10 days in dry weather; established bushes need water mainly during summer nut fill | Pet-safe |
| Eveline's Wax Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer, every 2–3 weeks in winter | Pet-safe |
| Evergold Japanese Sedge | Medium indirect light (a couple of metres from a window) | Every 5-7 days or when the top 2 cm of soil is dry | Pet-safe |
| Evergreen Huckleberry | Medium indirect light (a couple of metres from a window) | Moderate — water deeply every 7–10 days during dry periods | Pet-safe |
| evergreen miscanthus | Direct sun (at least 4-6 hours) | Every 7–14 days during the growing season; reduce but do not cease in mild winters | Pet-safe |
| Everlasting Sweet Pea | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant once mature | Pet-safe |
| Eyelash Sage | Bright indirect light (just back from a sunny window) | Every 7-10 days once established | Pet-safe |
| Fairy fan-flower | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 7–10 days in-ground once established | Pet-safe |
| 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 |
| Fanal astilbe | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer; weekly in cool or wet seasons | Pet-safe |
| Farewell-to-spring | Direct sun (at least 4-6 hours) | Every 7–10 days; reduce once established | Pet-safe |
| Feather Cactus | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; keep nearly dry in winter | Pet-safe |
| feather grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; minimal in winter | Pet-safe |
| feathertop grass | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2 weeks once established | Pet-safe |
| Feathery Air Plant | Bright indirect light (just back from a sunny window) | Mist lightly every 2–3 days in warm conditions; reduce to every 4–5 days in cooler weather. | Pet-safe |
| Feelin' Blue Deodar Cedar | Direct sun (at least 4-6 hours) | Weekly when young; monthly once established | Pet-safe |
| Female Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week in growing season; reduce significantly in dry or cooler periods | Pet-safe |
| Fennel-Leaved Sea Lavender | Direct sun (at least 4-6 hours) | Low to moderate — water to establish, then sparingly | Pet-safe |
| Fernleaf Dill | Direct sun (at least 4-6 hours) | Every 2–3 days; when top inch of soil feels dry | Pet-safe |
| Ferocactus glaucescens | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 14 days in summer; keep dry in winter | Pet-safe |
| Ferocactus schwarzii | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Few-flowered Abutilon | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; fortnightly in cooler months | Pet-safe |
| Few-flowered Neoregelia | Bright indirect light (just back from a sunny window) | Keep the central cup topped with water; allow potting medium or mount to dry slightly between waterings | Pet-safe |
| Few-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 |
| Field Chickweed | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; very sparingly in autumn and winter | Pet-safe |
| Field marigold | Direct sun (at least 4-6 hours) | Weekly during dry spells; self-sufficient once established | Pet-safe |
| Field Quesnelia | Bright indirect light (just back from a sunny window) | Tank every 7 days; soil every 10–14 days | Pet-safe |
| Field Sage | Direct sun (at least 4-6 hours) | Every 10-14 days once established; minimal in winter | Pet-safe |
| Field Wood Rush | Direct sun (at least 4-6 hours) | No supplemental watering needed in typical temperate climates; relies on natural rainfall | Pet-safe |
| Filbert 'Barcelona' | Direct sun (at least 4-6 hours) | Water young trees weekly; established trees need regular summer irrigation during nut fill, every 7-14 days in dry climates | Pet-safe |
| Filbert 'Ennis' | Direct sun (at least 4-6 hours) | Deep soak every 7-14 days in the first two seasons and during dry spells; established trees rarely need watering | Pet-safe |
| Filmy Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in summer, every 4–5 days in winter | Pet-safe |
| Finger Cactus | Direct sun (at least 4-6 hours) | When the soil has dried fully, roughly every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Fingered Sedge | Low light (north window or shaded room) | Moderate; keep moist but not waterlogged | Pet-safe |
| Fingertips | Bright indirect light (just back from a sunny window) | Every 2–3 weeks autumn through spring; minimal to none in summer | Pet-safe |
| Fire Alarm Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about weekly | Pet-safe |
| Fire 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 |
| Firefly heather | Direct sun (at least 4-6 hours) | Weekly during establishment; occasional deep watering once established | Pet-safe |
| Fireworks Globe Amaranth | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Fishbone Fern | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Fishhook Barrel | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep dry in winter | Pet-safe |
| Fishhook Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer; little to none from late autumn through winter | Pet-safe |
| Fishhook Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Fishtail Holly Fern | Low light (north window or shaded room) | Every 7–10 days; less in winter | Pet-safe |
| Fishtail Parlour Palm | Low light (north window or shaded room) | Every 7–10 days in spring and summer; every 14–21 days in autumn and winter | Pet-safe |
| Fishtail Sword Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days in warm weather; every 6–8 days in cooler months | Pet-safe |
| Fittonia albivenis 'Juanita' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil begins to dry, often every 3-5 days | Pet-safe |
| Fittonia albivenis 'Purple Vein' | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil just starts to dry, often every 3-5 days | Pet-safe |
| Fittonia albivenis 'Skeleton' | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil just begins to dry, often every 3-5 days | Pet-safe |
| 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 |
| Flame nasturtium | Bright indirect light (just back from a sunny window) | Water regularly to maintain consistent moisture, especially in spring and summer | Pet-safe |
| Flamingo Feather Celosia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 6-8 days | Pet-safe |
| Flanagan's Sage | Direct sun (at least 4-6 hours) | Every 10-14 days during the growing season; rarely in winter | Pet-safe |
| Flandria Blushing Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup weekly; water soil every 2–3 weeks | Pet-safe |
| Flat Sea Holly | Direct sun (at least 4-6 hours) | Low — water occasionally during the first growing season, then minimal | Pet-safe |
| Flat-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring and summer; reduce to every 14-21 days in winter | Pet-safe |
| Flat-Leaved 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 |
| Flat-Stem Wax Plant | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; less frequently in winter | Pet-safe |
| Flesh-coloured Habenaria | Bright indirect light (just back from a sunny window) | Every 3-5 days during active growth; completely dry during dormancy | Pet-safe |
| Flexuous Dancing Lady | Bright indirect light (just back from a sunny window) | When the top of the bark mix is dry, approximately every 7 days in summer and every 10-14 days in winter | Pet-safe |
| Flexuous Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter rest | Pet-safe |
| 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 |
| Florence Fennel | Direct sun (at least 4-6 hours) | Consistently moist, roughly every 2-3 days; never let it dry out | Pet-safe |
| Florence Fennel 'Orion' | Direct sun (at least 4-6 hours) | Keep evenly moist; deep watering 2-3 times weekly, increasing in hot, dry spells | Pet-safe |
| Florence Fennel 'Romanesco' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water deeply 2-3 times weekly in summer, more in heat | Pet-safe |
| Florence Fennel 'Zefa Fino' | Direct sun (at least 4-6 hours) | Every 3-5 days; never let the soil dry out | Pet-safe |
| Florida Columnea | Bright indirect light (just back from a sunny window) | When top 2–3 cm of mix dries | Pet-safe |
| Florida Silver Palm | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Flower Carpet Rose | Direct sun (at least 4-6 hours) | Deeply once a week in the growing season; more in containers or heat | Pet-safe |
| Flowering Dogwood 'Cherokee Chief' | Bright indirect light (just back from a sunny window) | Weekly deep watering, more in drought | Pet-safe |
| Fluffy Ruffle Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil feels barely moist, roughly every 5-7 days in summer | Pet-safe |
| Fly Bush | Direct sun (at least 4-6 hours) | Keep substrate consistently moist but not waterlogged; water every 2–4 days depending on conditions | Pet-safe |
| Fly-catching Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; allow the surface to barely begin to dry | Pet-safe |
| Flying Saucer Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly weekly to fortnightly in summer; keep nearly dry in winter | Pet-safe |
| Formosan Polypody | Medium indirect light (a couple of metres from a window) | Every 5–7 days in active growth; every 10–14 days in cooler months | Pet-safe |
| Forrests Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; very sparingly in winter | Pet-safe |
| Forsythia 'Lynwood Gold' | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in extended dry spells | Pet-safe |
| Forsythia 'Show Off' | Direct sun (at least 4-6 hours) | Weekly to establish, then mainly during dry spells | Pet-safe |
| Fortune's Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Fortune's Holly Fern | Low light (north window or shaded room) | When the top 2-3 cm of soil feels dry, roughly every 7-10 days in summer and every 10-14 days in winter | Pet-safe |
| Foster's Basket Bromeliad | Medium indirect light (a couple of metres from a window) | Tank every 5–7 days; soil every 10–14 days | Pet-safe |
| Foster's Neoregelia | 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 |
| Fountain Bamboo | Medium indirect light (a couple of metres from a window) | Twice weekly during the growing season; once weekly in cool periods | Pet-safe |
| Four-Leaf Pinyon | Direct sun (at least 4-6 hours) | Sparingly; deep soak monthly or less once established | Pet-safe |
| Four-stamen Tamarisk | Direct sun (at least 4-6 hours) | Moderate to low; drought-tolerant once established | Pet-safe |
| Fragrans Maidenhair Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist at all times, often every 2-4 days | Pet-safe |
| Fragrant Agrimony | Direct sun (at least 4-6 hours) | Every 7-10 days; allow the top 3-4 cm of soil to dry between waterings | Pet-safe |
| Fragrant Stanhopea | Bright indirect light (just back from a sunny window) | Daily or near-daily during active growth; reduce to every 2–3 days in winter | Pet-safe |
| Fragrant Stomatium | Bright indirect light (just back from a sunny window) | Sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| 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 |
| Frau Dagmar Hartopp Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant once settled | Pet-safe |
| Fred Ives | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in winter | Pet-safe |
| French Climbing Bean | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, approximately every 5-7 days | Pet-safe |
| French Tamarisk | Direct sun (at least 4-6 hours) | Moderate; drought-tolerant once established | Pet-safe |
| 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 |
| Friedrich's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn; none during summer dormancy | Pet-safe |
| Friendship Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-9 days | Pet-safe |
| Fringed Coreopsis | Direct sun (at least 4-6 hours) | Every 1–2 weeks once established; more frequently when young | Pet-safe |
| Fringed Houseleek | Direct sun (at least 4-6 hours) | Low — water sparingly, allowing soil to dry fully | Pet-safe |
| Fritschs Pouch Flower | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce in winter to every 10–14 days | Pet-safe |
| Fritz Luth Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in spring and summer; every 3–5 days in winter | Pet-safe |
| Fritz Luth Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in growing season; every 4–5 days in winter | Pet-safe |
| Front Range Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal in winter | Pet-safe |
| frost grass | Medium indirect light (a couple of metres from a window) | Weekly or whenever the top 2–3 cm of soil dries out; reduce in autumn and winter | Pet-safe |
| Frosted Curls Sedge | Bright indirect light (just back from a sunny window) | Weekly, or when top 2-3 cm of soil is dry | Pet-safe |
| Frosty Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the surface just begins to dry, often 2-3 times per week | Pet-safe |
| Fuchsia 'Annabel' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost are dry, roughly every 5-7 days in summer | Pet-safe |
| Fuchsia 'Beacon' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost are dry, roughly every 7-10 days in summer | Pet-safe |
| Fuchsia 'Cardinal Farges' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil are dry, roughly every 8-12 days when established | Pet-safe |
| Fuchsia 'Mrs Popple' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost is dry, roughly every 3-5 days during active growth | Pet-safe |
| Fuchsia 'Swingtime' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Full Moon Maple | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly weekly in summer | Pet-safe |
| 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 |
| Furzey Darley Dale heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Garden Catmint | Direct sun (at least 4-6 hours) | Every 7–14 days | Pet-safe |
| Garden Pea | Direct sun (at least 4-6 hours) | Weekly, increasing markedly once flowering and pod-filling begin | Pet-safe |
| Gasteria Acinacifolia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Armstrongii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Batesiana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Glomerata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Nitida | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Obliqua | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Pillansii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 3 weeks in growth | Pet-safe |
| Gasteria Pulchra | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Rawlinsonii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gaura 'Siskiyou Pink' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days during the growing season | Pet-safe |
| Genovese Basil | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, roughly every 2-4 days | Pet-safe |
| Gentian Speedwell | Bright indirect light (just back from a sunny window) | Once a week in dry conditions; the plant tolerates moderate drought once established | Pet-safe |
| Gentle Hermione Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week during the growing season; more in heat | Pet-safe |
| Georgia Blue Speedwell | Direct sun (at least 4-6 hours) | Moderate; water when the top 2–3 cm of soil dries out | Pet-safe |
| Geranium 'Johnson's Blue' | Direct sun (at least 4-6 hours) | Water to establish in the first season; thereafter when the top few cm of soil is dry, roughly weekly in dry spells | Pet-safe |
| Geranium macrorrhizum | Medium indirect light (a couple of metres from a window) | Water to establish; afterwards only in extended drought, roughly every 1-2 weeks if very dry | Pet-safe |
| Germander Speedwell | Medium indirect light (a couple of metres from a window) | Moderate — keep soil consistently moist, especially in summer | Pet-safe |
| Gertrude Jekyll Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season; more in heat or sandy soil | Pet-safe |
| 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 |
| Ghost Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season, reduce in winter | Pet-safe |
| Ghost Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and monthly or less in winter | Pet-safe |
| Giant Bamboo | Direct sun (at least 4-6 hours) | Frequently; requires abundant moisture year-round | Pet-safe |
| Giant Chalk Dudleya | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer, monthly or less in winter | Pet-safe |
| Giant Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering for young trees; deep watering in droughts for mature specimens | Pet-safe |
| Giant Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–4 days in active growth; every 5–7 days in winter | Pet-safe |
| Giant Sacaton | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent during establishment | Pet-safe |
| Giant Snowflake Bacopa | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of potting mix feels dry, roughly every 3-5 days in warm weather | Pet-safe |
| Giant Thorny Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during the growing season; reduce in the dry season | Pet-safe |
| Giant Timber Bamboo | Direct sun (at least 4-6 hours) | Deeply 2-3 times per week; more frequently in hot weather or during shooting season | Pet-safe |
| Giant Vriesea | Bright indirect light (just back from a sunny window) | Flush cup weekly; water medium every 2 weeks | Pet-safe |
| Giant Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Gireoud's Brassia | Bright indirect light (just back from a sunny window) | Every 3–4 days during active growth; reduce to weekly or less in cooler months | Pet-safe |
| Gladiolus-Flowered Werauhia | Bright indirect light (just back from a sunny window) | Refill the central tank weekly; water the growing medium every 1-2 weeks | Pet-safe |
| Glandular 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 |
| Glaucous Sedge | Medium indirect light (a couple of metres from a window) | Low to moderate — drought-tolerant when established | Pet-safe |
| Glaziou's Fuchsia | Bright indirect light (just back from a sunny window) | Water freely in growth; reduce in winter | Pet-safe |
| Gleditsia triacanthos 'Sunburst' | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are notably drought-tolerant | Pet-safe |
| Gleditsia triacanthos f. inermis | Direct sun (at least 4-6 hours) | Water weekly for the first two seasons; established trees are highly drought-tolerant | Pet-safe |
| Globe amaranth | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant once established | Pet-safe |
| Globe candytuft | Direct sun (at least 4-6 hours) | Every 7–10 days; keep evenly moist but not waterlogged | Pet-safe |
| Globe-Flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–5 weeks in winter | Pet-safe |
| Glory of 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 |
| Glossy Abelia | Direct sun (at least 4-6 hours) | Regularly during the first growing season; occasional deep watering once established | Pet-safe |
| Gmelin's Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Pet-safe |
| Goat's Horn Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep dry from late autumn through winter | Pet-safe |
| Goat's 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 majestica 'Whitestar' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, typically every 5-7 days | Pet-safe |
| Goeppertia Pluriplicata | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Goeppertia Roseopicta Illustris | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Goeppertia White Fusion | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Gold Dust Alyssum | Direct sun (at least 4-6 hours) | Fortnightly to monthly once established (very drought-tolerant) | Pet-safe |
| Gold Haze heather | Direct sun (at least 4-6 hours) | Weekly during first season; occasional watering once established | Pet-safe |
| Golden Alexanders | Bright indirect light (just back from a sunny window) | Weekly or as needed to keep soil moist | Pet-safe |
| Golden Apple | Direct sun (at least 4-6 hours) | Every 7–14 days; moderate drought tolerance when established | Pet-safe |
| Golden Ash | Direct sun (at least 4-6 hours) | Moderate; regular deep watering when establishing | Pet-safe |
| Golden Bamboo | Direct sun (at least 4-6 hours) | Weekly when establishing; drought-tolerant once established | Pet-safe |
| Golden Bantam Sweetcorn | Direct sun (at least 4-6 hours) | Water deeply every 5-7 days during active growth; increase to every 2-3 days during silking, tasselling, and cob swelling | Pet-safe |
| Golden Barrel 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 |
| Golden Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Pet-safe |
| Golden Cliff Stonecrop | Direct sun (at least 4-6 hours) | Every 10–14 days in spring and autumn; monthly in summer; very sparingly in winter | Pet-safe |
| Golden currant | Direct sun (at least 4-6 hours) | Every 10–14 days once established; deeply | Pet-safe |
| 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 everlasting | Direct sun (at least 4-6 hours) | Every 7–10 days once established; reduce in autumn | Pet-safe |
| golden fescue | Direct sun (at least 4-6 hours) | Low; water every 10–14 days during the growing season, less in winter | Pet-safe |
| Golden Goddess Bamboo | Direct sun (at least 4-6 hours) | Twice weekly during dry periods in summer; reduce to weekly or less in cooler seasons | Pet-safe |
| Golden Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks (allow soil to dry completely between waterings) | Pet-safe |
| Golden Japanese Sweet Flag | Medium indirect light (a couple of metres from a window) | Keep constantly moist; tolerate standing water | Pet-safe |
| Golden Jubilee Anise Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days once established; more frequent for newly planted specimens | Pet-safe |
| Golden Kiwi | Direct sun (at least 4-6 hours) | Water deeply and consistently through the growing season, never allowing summer drought | 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 Lemon Thyme | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; less in winter | Pet-safe |
| Golden Malayan Dwarf Coconut | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in heat, never drying out fully | Pet-safe |
| golden mosaic plant | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Golden Oregano | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| Golden Polypody | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and summer; every 10–14 days in autumn and winter | Pet-safe |
| Golden Polypody Fern | 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 |
| 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 Sage | Direct sun (at least 4-6 hours) | When the soil is dry a few centimetres down, roughly every 7-14 days; far less in winter | Pet-safe |
| Golden Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–4 weeks when established; very little in winter | Pet-safe |
| Golden Sedum | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Golden 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 Torch Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about weekly to fortnightly in summer; keep dry in winter | Pet-safe |
| Golden-Edged Cymbidium | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, about every 5-7 days, drier in winter | Pet-safe |
| Golden-flowered Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; minimally in winter | Pet-safe |
| Golden-Hair Bamboo | Bright indirect light (just back from a sunny window) | Twice per week in growing season; once per week or less in winter | Pet-safe |
| Golden-spike Disa | Bright indirect light (just back from a sunny window) | Keep consistently moist throughout the year, roughly every 2-4 days | Pet-safe |
| Goldfinger Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil is dry, every 2-4 days in active growth | Pet-safe |
| Gomphrena globosa 'QIS Pink' | Direct sun (at least 4-6 hours) | Water deeply once a week; let soil dry between waterings | Pet-safe |
| Goumi | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; regularly while young, then only in dry spells | Pet-safe |
| Governor Plum | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10–14 days; very drought-tolerant once established | Pet-safe |
| Graceful Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days in summer; every 4–5 days in winter | Pet-safe |
| Grand Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once mature | Pet-safe |
| Grandidier's Baobab | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; virtually none in autumn–winter dormancy | Pet-safe |
| Grape-Scented Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Graptopetalum amethystinum | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 12-16 days in summer, sparingly in winter | Pet-safe |
| Graptopetalum macdougallii | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 12-16 days in summer, minimal in winter | Pet-safe |
| Graptopetalum pentandrum | Direct sun (at least 4-6 hours) | Every 2-3 weeks (less in winter) | Pet-safe |
| Graptopetalum rusbyi | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Graptosedum 'Francesco Baldi' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Graptosedum 'Vera Higgins' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Graptoveria '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 '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-leaf Disa | Bright indirect light (just back from a sunny window) | Keep consistently moist year-round, roughly every 2-3 days in summer | Pet-safe |
| Grassy Arrowhead | Direct sun (at least 4-6 hours) | Permanently aquatic; grow in standing water 5–30 cm (2–12 in) deep | Pet-safe |
| Gray Birch | Direct sun (at least 4-6 hours) | Moderate; tolerates drier conditions than most birches once established | Pet-safe |
| Gray Goldenrod | Direct sun (at least 4-6 hours) | Very drought-tolerant; supplemental water rarely needed | Pet-safe |
| Gray Organ Pipe | Direct sun (at least 4-6 hours) | When the top half of soil is dry, roughly every 10-14 days in summer; very infrequently in winter | Pet-safe |
| Gray's sedge | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water every 2–4 days in dry weather | Pet-safe |
| Great Wood Rush | Medium indirect light (a couple of metres from a window) | Low to moderate; established plants rarely need supplemental watering in temperate climates | Pet-safe |
| Greater Coreopsis | Bright indirect light (just back from a sunny window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Greater Knapweed | Direct sun (at least 4-6 hours) | Rarely needed once established; water new plants occasionally through their first summer | Pet-safe |
| Greater Plantain | Direct sun (at least 4-6 hours) | Every 7-14 days; extremely drought-tolerant once established | Pet-safe |
| Greater Pyramidal Saxifrage | Direct sun (at least 4-6 hours) | Every 10–14 days during the growing season; very sparingly in winter | Pet-safe |
| Greek Bush Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Greek Fir | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; rarely needed once mature | Pet-safe |
| Greek Sage | Direct sun (at least 4-6 hours) | Low; water when the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Green Ash | Direct sun (at least 4-6 hours) | Weekly when establishing; drought-tolerant once mature | 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 Glaucous Bamboo | Direct sun (at least 4-6 hours) | Twice weekly during establishment; every 7–14 days once mature | Pet-safe |
| Green Moor Grass | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks during establishment; largely self-sufficient once established | Pet-safe |
| Green Panda Bamboo | Bright indirect light (just back from a sunny window) | Twice weekly during establishment and dry spells; weekly once established | Pet-safe |
| Green 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 Shiso | Bright indirect light (just back from a sunny window) | Every 2–3 days; keep consistently moist | Pet-safe |
| Green-flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–12 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Green-spotted Billbergia | Bright indirect light (just back from a sunny window) | Keep central cup lightly filled; water substrate every 1-2 weeks | Pet-safe |
| Green-Spotted Neoregelia | Bright indirect light (just back from a sunny window) | Refresh central cup every 5–7 days; soil every 2–3 weeks | Pet-safe |
| Greene's Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during active growth (autumn–spring); very little to none in summer | Pet-safe |
| Greenspire Linden | Direct sun (at least 4-6 hours) | Moderate; deep watering during establishment and drought | Pet-safe |
| Greenstem Forsythia | Direct sun (at least 4-6 hours) | Weekly while establishing, then drought-tolerant | Pet-safe |
| Grefsheim Spirea | Direct sun (at least 4-6 hours) | Weekly until established; reduce to occasional watering in drought | Pet-safe |
| Grey Goldenrod | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Pet-safe |
| Grey Moor Grass | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Grey Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; drought-tolerant once established | Pet-safe |
| Grey Saltbush | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment, then minimal | Pet-safe |
| Grey sedge | Medium indirect light (a couple of metres from a window) | Occasional once established; more frequent in full sun or sandy soil | Pet-safe |
| Grey Speedwell | Direct sun (at least 4-6 hours) | Every 14–21 days during growing season; barely any in winter | Pet-safe |
| Grey-Headed Coneflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; drought-tolerant | Pet-safe |
| 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 |
| Guadua Bamboo | Direct sun (at least 4-6 hours) | Frequently during establishment; moderate once mature | Pet-safe |
| Guariroba Palm | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| Gumbo Limbo | Direct sun (at least 4-6 hours) | Weekly when newly planted; once established, drought-tolerant and needs watering only during prolonged dry spells | Pet-safe |
| 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 |
| Guppy's Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in active growth; every 3–4 weeks in winter | Pet-safe |
| Guriri Palm | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| 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 'Orangeade' | Bright indirect light (just back from a sunny window) | Keep the central cup topped up; flush and refill every 1-2 weeks | Pet-safe |
| Guzmania monostachia | Bright indirect light (just back from a sunny window) | Maintain water in the central cup; flush and refill every 1-2 weeks | Pet-safe |
| Guzmania wittmackii | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Gymnocalycium andreae | Bright indirect light (just back from a sunny window) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Gymnocalycium denudatum | Bright indirect light (just back from a sunny window) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Gyoku-ryu Mondo Grass | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days in growth | Pet-safe |
| H.E. Beale heather | Direct sun (at least 4-6 hours) | Weekly during first season; monthly or as needed once established | Pet-safe |
| Hair sedge | Bright indirect light (just back from a sunny window) | Regular watering to maintain even moisture; reduce slightly in winter | Pet-safe |
| Hairy alumroot | Medium indirect light (a couple of metres from a window) | Once or twice per week during active growth; less in winter | Pet-safe |
| Hairy Beardtongue | Bright indirect light (just back from a sunny window) | Every 1–2 weeks once established; more frequent when newly planted | Pet-safe |
| Hairy Coreopsis | Direct sun (at least 4-6 hours) | Low to moderate; water during establishment, then as needed during drought | Pet-safe |
| Hairy Houseleek | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; once a month or less in winter | Pet-safe |
| Hairy Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season; sparingly in winter | Pet-safe |
| Hairy Mallow | Direct sun (at least 4-6 hours) | Every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Hairy Parakohleria | Medium indirect light (a couple of metres from a window) | Every 5–7 days during active growth; reduce to every 10–14 days in cooler months | Pet-safe |
| Hairy Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow soil to nearly dry between waterings) | Pet-safe |
| Hairy Rock Jasmine | Direct sun (at least 4-6 hours) | Sparingly; dry conditions preferred especially in winter | Pet-safe |
| Hairy Slipper Orchid | Medium indirect light (a couple of metres from a window) | Every 5–7 days year-round | Pet-safe |
| Hairy Stonecrop | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; minimal in winter | Pet-safe |
| Hairy Woodrush | Low light (north window or shaded room) | Every 7–10 days during the growing season | Pet-safe |
| Hairy-Cupped Coelogyne | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; every 10–14 days in winter | Pet-safe |
| Hairy-fruited Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; very little in winter | Pet-safe |
| Hairy-tongued Restrepia | Medium indirect light (a couple of metres from a window) | Every 2–4 days; medium stays lightly moist | Pet-safe |
| Halesia carolina | Bright indirect light (just back from a sunny window) | Weekly while establishing; regular watering in dry spells | Pet-safe |
| Halesia monticola | Bright indirect light (just back from a sunny window) | Weekly while establishing; regular watering in dry spells | Pet-safe |
| Hall's Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water in autumn (September–November) only; completely dry in winter and summer | Pet-safe |
| Hameln Dwarf Fountain Grass | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, about weekly while establishing; drought-tolerant once settled | Pet-safe |
| Hameln Fountain Grass | Direct sun (at least 4-6 hours) | Weekly for the first season; every 2 weeks once established | Pet-safe |
| Hamilton's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in autumn and winter | Pet-safe |
| Hammock Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season, every 10–14 days in winter | Pet-safe |
| Hand-Bearing Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Hansa Rose | Direct sun (at least 4-6 hours) | Water weekly while establishing; drought-tolerant once settled | Pet-safe |
| Happy Bean Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in spring/summer; every 4–6 weeks in winter | Pet-safe |
| Hardy Chinese Windmill Palm | Direct sun (at least 4-6 hours) | Weekly while establishing; established garden plants need little extra water | Pet-safe |
| Hare's Foot Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Hare's Tail Grass | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| Harebell | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Pet-safe |
| Haricot Vert | Direct sun (at least 4-6 hours) | Every 2–3 days; daily in heat above 30 °C | Pet-safe |
| Hartford Climbing Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in active growth | Pet-safe |
| Hasse's Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); virtually none in summer | Pet-safe |
| 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 |
| Hautbois Strawberry | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow top 2 cm to dry between waterings | Pet-safe |
| Haworthia | Bright indirect light (just back from a sunny window) | When the soil is dry, every 2-3 weeks | Pet-safe |
| Haworthia Bayeri | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Haworthia cooperi var. truncata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Pet-safe |
| Haworthia Emelyae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Herbacea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Lockwoodii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Magnifica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Mucronata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Pygmaea | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Haworthia Springbokvlakensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Tessellata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Venosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthiopsis Viscosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Hawthorn | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly while young, rarely once established | Pet-safe |
| Headed Thyme | Direct sun (at least 4-6 hours) | Every 14–28 days; little to no supplemental watering once established outdoors | Pet-safe |
| Heart-leaved Blechnum | Medium indirect light (a couple of metres from a window) | Twice a week in summer, once a week in cooler months | Pet-safe |
| Heart-leaved Globe Daisy | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; very sparingly in winter | Pet-safe |
| Heart-Lipped Brassavola | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; reduce to every 7–10 days in cooler months | Pet-safe |
| Heartleaf Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; reduce significantly in winter | Pet-safe |
| Heartleaf Foamflower | Medium indirect light (a couple of metres from a window) | Regular; keep consistently moist | Pet-safe |
| Heartleaf Golden Alexanders | Bright indirect light (just back from a sunny window) | Every 1–2 weeks once established; more frequently in the first season | Pet-safe |
| Heartleaf Hornbeam | Medium indirect light (a couple of metres from a window) | Moderate; water regularly when young; maintain consistent moisture | Pet-safe |
| Heath Speedwell | Bright indirect light (just back from a sunny window) | Low to moderate — allow soil to partially dry between waterings | Pet-safe |
| Heath-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Heather | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Pet-safe |
| Heavy Metal Switchgrass | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2–3 weeks once established | Pet-safe |
| Hedge Bamboo | Bright indirect light (just back from a sunny window) | 2-3 times per week; daily in summer heat or in containers | Pet-safe |
| Hedgehog Fescue | Direct sun (at least 4-6 hours) | Every 14–21 days when established; very sparingly in winter | Pet-safe |
| Hedgerow Cranesbill | Bright indirect light (just back from a sunny window) | Low to moderate; water only to establish, then drought-tolerant | Pet-safe |
| Heldreich's Sage | Direct sun (at least 4-6 hours) | Occasional; drought-tolerant once established | Pet-safe |
| Helianthus salicifolius | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm of soil is dry, roughly every 7-10 days; drought-tolerant once established | Pet-safe |
| Helmet-Shaped Gongora | Bright indirect light (just back from a sunny window) | Every 4–6 days when actively growing; reduce to every 10–14 days in winter | Pet-safe |
| 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 |
| Hemp-leaved Marshmallow | Direct sun (at least 4-6 hours) | Weekly when establishing; every 10–14 days once established | Pet-safe |
| Henry's Lime | Bright indirect light (just back from a sunny window) | Weekly during establishment; deep watering every 2–3 weeks in dry periods | Pet-safe |
| Herb garden | Direct sun (at least 4-6 hours) | Depends on the herb | 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 |
| Heritage River Birch | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the first 2 years; established trees prefer consistently moist soil | Pet-safe |
| Hernandez-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in autumn and winter | Pet-safe |
| Herrenhausen Oregano | Direct sun (at least 4-6 hours) | Every 10–14 days when established; more frequently for young plants | Pet-safe |
| Heuchera 'Hollywood' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Heuchera 'Midnight Rose' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Heuchera 'Mocha' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Heuchera 'Northern Exposure Amber' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Heuchera 'Pewter Moon' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Heuchera 'Purple Petticoats' | 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 |
| Heucherella Brass Lantern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | Pet-safe |
| Heucherella Stoplight | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water deeply once or twice a week in dry spells | Pet-safe |
| Heucherella Sunrise Falls | Medium indirect light (a couple of metres from a window) | Keep evenly moist; in containers and baskets water more often, even daily in summer heat | Pet-safe |
| Heucherella Sweet Tea | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water deeply once or twice a week in dry weather | Pet-safe |
| Heuffel's Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; rarely in winter | Pet-safe |
| Hibiscus syriacus 'Aphrodite' | Direct sun (at least 4-6 hours) | Weekly while establishing; every 10-14 days once mature unless rainfall is sparse | Pet-safe |
| Hibiscus syriacus 'Blue Bird' | Direct sun (at least 4-6 hours) | Water weekly during the first two seasons and in summer droughts; established plants are moderately drought-tolerant | Pet-safe |
| Hibiscus syriacus 'Helene' | Direct sun (at least 4-6 hours) | Water weekly while establishing and during summer drought; moderately drought-tolerant once mature | Pet-safe |
| Hibiscus syriacus 'Minerva' | Direct sun (at least 4-6 hours) | Water weekly during establishment and summer drought; moderately drought-tolerant once established | Pet-safe |
| Hildebrands Basket Vine | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of the potting mix has dried out, roughly every 5–8 days in summer | Pet-safe |
| Hildebrandt Ravenea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Hill Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Hillii Staghorn Fern | Bright indirect light (just back from a sunny window) | Soak when the mount is nearly dry, roughly weekly in summer and every 2-3 weeks in winter | Pet-safe |
| Hindu rope plant | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days in growth | Pet-safe |
| Hindu Rope Plant | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of compost is dry, roughly every 10-14 days in summer | Pet-safe |
| Hindu Rope Plant | Bright indirect light (just back from a sunny window) | When the mix is mostly dry, every 10-14 days or longer | Pet-safe |
| Hinnonmäki Red Gooseberry | Direct sun (at least 4-6 hours) | Water deeply once or twice weekly in dry weather, prioritising the fruit-swelling period | Pet-safe |
| Hoary Plantain | Direct sun (at least 4-6 hours) | Rarely; established plants are drought-tolerant | Pet-safe |
| Hollow Joe Pye Weed | Direct sun (at least 4-6 hours) | Keep soil reliably moist; water weekly or more during dry weather | Pet-safe |
| Hollow-Corolla Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–20 days in summer, very sparingly in winter | Pet-safe |
| Holly Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Hollyhock | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce in autumn and winter | Pet-safe |
| Holy Basil (Tulsi) | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in warm weather | Pet-safe |
| Honeoye Strawberry | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in summer | Pet-safe |
| Honeoye Strawberry | Direct sun (at least 4-6 hours) | Every 2–3 days in active growth; weekly in dormancy | Pet-safe |
| Hooded Maxillaria | Medium indirect light (a couple of metres from a window) | Every 5–7 days year-round; slight reduction in winter | Pet-safe |
| Hooker's Inula | Bright indirect light (just back from a sunny window) | 2 times per week; tolerates periodic damp conditions | Pet-safe |
| Hoop Pine | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| 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 |
| Hosui Asian pear | Direct sun (at least 4-6 hours) | Weekly during growing season, fortnightly when dormant | 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 |
| Hoya | Bright indirect light (just back from a sunny window) | When the soil is mostly dry, every 10-14 days | Pet-safe |
| Hoya 'Mathilde' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya Australis | Bright indirect light (just back from a sunny window) | when top 2-3 cm of soil dries | Pet-safe |
| Hoya Bella | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Bella 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-9 days in growth | Pet-safe |
| Hoya Bilobata | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; about every 2 weeks in winter | Pet-safe |
| Hoya Cagayanensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Carnosa 'Rubra' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya caudata (Sumatra) | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in growth; every 2-3 weeks in winter | Pet-safe |
| Hoya Compacta | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Hoya Compacta 'Regalis' | Bright indirect light (just back from a sunny window) | When the mix is dry to 4-5 cm down, about every 10-14 days | Pet-safe |
| Hoya Coriacea | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya curtisii | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; every 10-14 days in autumn and winter | Pet-safe |
| Hoya Davidcummingii | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days | Pet-safe |
| Hoya Diptera | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of the mix is dry, roughly every 6-10 days in growth | Pet-safe |
| Hoya Engleriana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 6-9 days in growth | Pet-safe |
| Hoya Flagellata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Gracilis | Bright indirect light (just back from a sunny window) | When the mix is nearly or fully dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Greenii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya heuschkeliana | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Incrassata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Lambii | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Linearis | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Meliflua | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Memoria (Gracilis) | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring/summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Mitrata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Neoguineensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Onychoides | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Pachyclada | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Pallida | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-9 days in growth | Pet-safe |
| Hoya Parviflora | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Patella | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-9 days in growth | Pet-safe |
| Hoya Paxtonii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Pentaphlebia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Picta | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya polyneura (Fishtail Hoya) | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Pubescens | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Pubicalyx 'Black Dragon' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Pubicalyx 'Pink Silver' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, about every 7-12 days in growth | Pet-safe |
| Hoya Pubicalyx 'Red Buttons' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, about every 7-12 days in growth | Pet-safe |
| Hoya Pubicalyx 'Royal Hawaiian Purple' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Pubicalyx 'Silver Pink' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Rebecca | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of the mix is dry, roughly every 6-10 days in growth | Pet-safe |
| Hoya Rigida | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Rosita | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Hoya Scortechinii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya sigillatis | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 1-2 inches (3-5 cm) of mix dry out first | Pet-safe |
| Hoya Siikfongensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Spartioides | Bright indirect light (just back from a sunny window) | When the mix is nearly dry throughout, roughly every 12-18 days | Pet-safe |
| Hoya Sunrise | Bright indirect light (just back from a sunny window) | When the top of the mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Surigaoensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days | Pet-safe |
| Hoya Vitellinoides | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Vitiensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Huang Qi | Direct sun (at least 4-6 hours) | Every 10–14 days once established; drought-tolerant | Pet-safe |
| Hubbard Squash | Direct sun (at least 4-6 hours) | 2–3 times per week during active growth; reduce as fruit nears maturity | Pet-safe |
| 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 |
| Hunchback Gymnocalycium | 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; every 3-4 weeks in winter | Pet-safe |
| Hungarian Barren Strawberry | Medium indirect light (a couple of metres from a window) | Low; drought-tolerant once established | Pet-safe |
| Hylotelephium 'Autumn Joy' | Direct sun (at least 4-6 hours) | Roughly every 10-14 days in its first season; established plants rarely need watering | Pet-safe |
| Hylotelephium 'Purple Emperor' | Direct sun (at least 4-6 hours) | Every 10-14 days when young; established plants need little to no watering | Pet-safe |
| Hylotelephium spectabile 'Brilliant' | Direct sun (at least 4-6 hours) | Every 10-14 days while establishing; mature clumps rely on rainfall | Pet-safe |
| Hylotelephium telephium 'Munstead Dark Red' | Direct sun (at least 4-6 hours) | Every 10-14 days while establishing; mature plants are largely self-reliant | Pet-safe |
| Hypoestes phyllostachya 'Carmina' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Confetti Pink' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Splash Select Pink' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Splash Select White' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Hypoestes phyllostachya 'Wit' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, often every 4-7 days | Pet-safe |
| Iberian Cranesbill | Bright indirect light (just back from a sunny window) | Weekly in spring and summer; occasional in autumn | Pet-safe |
| Ice Cream Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil dries, every 2-4 days in warm growth | Pet-safe |
| Ice Dance Japanese Sedge | Low light (north window or shaded room) | Every 7-10 days or when the top 3-4 cm of soil is dry | Pet-safe |
| Ice Plant | Direct sun (at least 4-6 hours) | Every 10-14 days during establishment; mature clumps rely on rainfall | Pet-safe |
| Iceberg Lettuce | Direct sun (at least 4-6 hours) | Keep soil consistently moist, watering every 1-2 days in warm weather | Pet-safe |
| Iceberg Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Idaho fescue | Direct sun (at least 4-6 hours) | Very low; water every 2–3 weeks during the first season; monthly or less once established | Pet-safe |
| Illinois Tick Trefoil | Direct sun (at least 4-6 hours) | Deep watering every 10–14 days during the first growing season; drought-tolerant once established | Pet-safe |
| Imbricate Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days; do not allow compost to dry out | Pet-safe |
| Imbricate Sword Fern | Low light (north window or shaded room) | Every 5–7 days in summer, every 10–14 days in winter | Pet-safe |
| Immersed Stelis | Medium indirect light (a couple of metres from a window) | Daily misting for mounted specimens; every 2 days for potted plants | Pet-safe |
| Impatiens balsamina | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Imperator Carrot | Direct sun (at least 4-6 hours) | Every 3–4 days; deep, infrequent watering encourages deep root growth | Pet-safe |
| Imperial Bromeliad | Direct sun (at least 4-6 hours) | Water sparingly; allow potting medium to almost completely dry between waterings | Pet-safe |
| Indian Blanket | Direct sun (at least 4-6 hours) | Every 1–2 weeks; drought-tolerant once established | Pet-safe |
| Indian Elecampane | Bright indirect light (just back from a sunny window) | 2 times per week; reduce in winter when dormant | Pet-safe |
| Indian Fig Opuntia | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | Pet-safe |
| indian grass | Direct sun (at least 4-6 hours) | Rarely once established; water during the first growing season to aid establishment | 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 Jujube | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7–14 days; very drought-tolerant once established | Pet-safe |
| Indian Shot | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Indian Summer black-eyed Susan | Direct sun (at least 4-6 hours) | Weekly; allow the top 2–3 cm of soil to dry slightly between waterings | Pet-safe |
| Indian Summer Raspberry | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days, more in fruiting heat | Pet-safe |
| Indian Timber Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during the growing season; reduce in winter | Pet-safe |
| 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 |
| Intermediate Polypody | Medium indirect light (a couple of metres from a window) | Every 7–10 days in active growth (autumn–spring); reduce to every 2–3 weeks in summer | Pet-safe |
| Invicta Gooseberry | Direct sun (at least 4-6 hours) | Keep soil evenly moist; deep-water weekly in dry spells, especially while fruit is swelling | Pet-safe |
| Iridescent Bamboo | Direct sun (at least 4-6 hours) | Twice weekly in spring and summer; weekly in autumn; fortnightly in winter | Pet-safe |
| Irish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Isabel Chan's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in winter | Pet-safe |
| Island Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in active season (October–April); none to minimal in summer | Pet-safe |
| Italian aster | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; drought-tolerant in summer | Pet-safe |
| Italian Oregano | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 7-10 days once established | Pet-safe |
| Itsy Bitsy Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Ivory Cane Palm | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| 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 |
| Jaboticaba | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep consistently moist but not waterlogged | Pet-safe |
| Jamaican Tall Coconut | Direct sun (at least 4-6 hours) | Keep consistently moist; water every 3-5 days in heat, never drying out fully | Pet-safe |
| Japanese Arborvitae | Direct sun (at least 4-6 hours) | Regular — keep soil evenly moist; do not allow to dry out completely | Pet-safe |
| Japanese astilbe | Medium indirect light (a couple of metres from a window) | Twice per week in active growth; weekly in cooler seasons | Pet-safe |
| Japanese Big-Leaf Magnolia | Bright indirect light (just back from a sunny window) | Weekly during dry periods; established trees are moderately drought-tolerant | Pet-safe |
| Japanese Brake Fern | Medium indirect light (a couple of metres from a window) | Every 4–6 days in the growing season; every 7–10 days in winter | Pet-safe |
| Japanese Camellia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist in late summer | Pet-safe |
| Japanese Camellia 'Nuccio's Pearl' | Bright indirect light (just back from a sunny window) | About weekly, more in heat and during budding; water when the top 3-5 cm of soil is dry | Pet-safe |
| Japanese Catmint | Medium indirect light (a couple of metres from a window) | Every 5–7 days; do not allow to dry out completely | Pet-safe |
| Japanese Chain Fern | Medium indirect light (a couple of metres from a window) | Every 4–6 days in summer, every 8–12 days in winter | Pet-safe |
| Japanese Chestnut | Direct sun (at least 4-6 hours) | Water deeply every 7-14 days while establishing and during summer drought as nuts develop | Pet-safe |
| Japanese Cornel Dogwood | Direct sun (at least 4-6 hours) | Regular watering while establishing; drought-tolerant once mature | Pet-safe |
| Japanese Dunce Cap | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; reduce significantly in winter dormancy | Pet-safe |
| Japanese Holly Fern | Low light (north window or shaded room) | Every 7–10 days; allow top 2–3 cm of soil to dry between waterings | Pet-safe |
| Japanese Maple 'Dissectum' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, often weekly in summer | Pet-safe |
| Japanese Maple 'Osakazuki' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, around weekly in dry weather | Pet-safe |
| Japanese Maple 'Sango Kaku' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly weekly in dry spells | Pet-safe |
| Japanese Rose | Direct sun (at least 4-6 hours) | Weekly while young, then drought-tolerant once established | Pet-safe |
| Japanese Shield Fern | Medium indirect light (a couple of metres from a window) | Regular; keep soil evenly moist | Pet-safe |
| Japanese Spirea | Direct sun (at least 4-6 hours) | Once per week while establishing; drought-tolerant when established | Pet-safe |
| Japanese Spirea 'Goldflame' | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry, about weekly while establishing | Pet-safe |
| Japanese Sweet Potato | Direct sun (at least 4-6 hours) | Moderate; about 25 mm (1 in) per week, tapering off near harvest | Pet-safe |
| Japanese Tassel Fern | Medium indirect light (a couple of metres from a window) | Regular; maintain consistent moisture | Pet-safe |
| Japanese Timber Bamboo | Direct sun (at least 4-6 hours) | Frequent during establishment; moderate once established | Pet-safe |
| Japanese Tree Lilac 'Ivory Silk' | Direct sun (at least 4-6 hours) | Weekly deep soakings for the first two years, then during droughts | Pet-safe |
| Japanese Witch Hazel | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days in the growing season | Pet-safe |
| Jasminum beesianum | Direct sun (at least 4-6 hours) | Keep evenly moist while establishing; water in prolonged dry spells once mature | Pet-safe |
| Jasminum mesnyi | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Jasminum nudiflorum | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry out, about every 7-10 days while establishing | Pet-safe |
| Java Plum | Direct sun (at least 4-6 hours) | Water regularly when young; established trees are drought-tolerant and flood-tolerant. | Pet-safe |
| Jean's Dilly Spruce | Bright indirect light (just back from a sunny window) | Regular; do not allow to dry out completely, especially in warm weather | Pet-safe |
| Jelly Palm | Direct sun (at least 4-6 hours) | Weekly when young; established palms rely largely on rainfall in temperate climates | Pet-safe |
| Jenkins Fan Palm | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil feels dry | Pet-safe |
| Jerusalem Artichoke | Direct sun (at least 4-6 hours) | Every 1–2 weeks; drought-tolerant once established | Pet-safe |
| Jerusalem Artichoke | Direct sun (at least 4-6 hours) | Weekly in dry spells, every 7-14 days; otherwise relies largely on rainfall | Pet-safe |
| Jerusalem Artichoke 'Red Fuseau' | Direct sun (at least 4-6 hours) | Water regularly through summer, especially as tubers bulk up in late season | 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 |
| Jewel Strawberry | Direct sun (at least 4-6 hours) | Every 2–3 days in warm growing season; weekly in dormancy | Pet-safe |
| Jewel Sweet Potato | Direct sun (at least 4-6 hours) | Water deeply every 5-7 days; taper off to every 10-14 days in the final 3-4 weeks before harvest | Pet-safe |
| Johann's Neoregelia | Bright indirect light (just back from a sunny window) | Top up central cup every 5–7 days; soil every 2–3 weeks | Pet-safe |
| Johannes Cape Primrose | Medium indirect light (a couple of metres from a window) | Every 5-8 days in active growth; every 2-3 weeks in winter | Pet-safe |
| Joseph's Coat Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Joseph's Lepanthes | Medium indirect light (a couple of metres from a window) | Every 7–10 days (potted); near-daily misting if mounted | Pet-safe |
| Jubilee Celebration Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Juniper-leaved Thrift | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; very sparingly in winter | Pet-safe |
| Jupiter's Distaff | Medium indirect light (a couple of metres from a window) | Regularly in dry spells, especially in sun | Pet-safe |
| Kalamata olive | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; minimal in winter | Pet-safe |
| Kamchatka Stonecrop | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days; very infrequently once established | Pet-safe |
| Kangaroo Vine | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Pet-safe |
| Karl Foerster Feather Reed Grass | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, roughly weekly; tolerant of occasional wet ground | Pet-safe |
| Karl Foerster Feather Reed Grass | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks once established | Pet-safe |
| Karl Foerster Reed Grass | Bright indirect light (just back from a sunny window) | Every 7-14 days during the first season; established plants need water only in prolonged drought | Pet-safe |
| Karley Rose Oriental Fountain Grass | Direct sun (at least 4-6 hours) | Weekly in the first season, then moderate watering during dry periods | Pet-safe |
| Kauri | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring/summer; reduce to every 10–14 days in winter | Pet-safe |
| Kenneally's Sundew | Bright indirect light (just back from a sunny window) | Standing tray (growing season); minimal (dry rest) | Pet-safe |
| Kentia palm | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, every 10-14 days | Pet-safe |
| Kentucky Wonder Pole Bean | Direct sun (at least 4-6 hours) | Every 2–3 days during active growth; increase during pod fill | Pet-safe |
| Khirni | Direct sun (at least 4-6 hours) | Every 7–14 days when young; drought-tolerant once established | Pet-safe |
| Kidney Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days during active growth; every 6–8 days in winter | Pet-safe |
| Kiftsgate Rose | Direct sun (at least 4-6 hours) | Deep weekly soak while establishing; little needed once mature | Pet-safe |
| King George aster | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; rarely needs irrigation in UK climates | Pet-safe |
| King Size Scarlet everlasting | Direct sun (at least 4-6 hours) | Every 7–10 days; water deeply then let soil partially dry | Pet-safe |
| Kniphofia 'Alcazar' | Direct sun (at least 4-6 hours) | Weekly while establishing and during summer drought; minimal once mature | Pet-safe |
| Kniphofia 'Bees' Sunset' | Direct sun (at least 4-6 hours) | Weekly while establishing and during drought; little once mature | Pet-safe |
| Kniphofia 'Little Maid' | Direct sun (at least 4-6 hours) | Weekly while establishing and in summer drought; sparing once settled | Pet-safe |
| Kniphofia 'Tawny King' | Direct sun (at least 4-6 hours) | Weekly during the first season and in summer drought; established clumps need little once settled | Pet-safe |
| Kniphofia triangularis | Direct sun (at least 4-6 hours) | Every 10-14 days once established, when soil is dry | Pet-safe |
| Kniphofia uvaria | Direct sun (at least 4-6 hours) | Water regularly through the first season, then mainly in summer dry spells once established | Pet-safe |
| Knotted Clover | Direct sun (at least 4-6 hours) | Low; drought-tolerant | Pet-safe |
| Kobus Magnolia | Direct sun (at least 4-6 hours) | Weekly when establishing; once established, natural rainfall is often sufficient except during prolonged drought | Pet-safe |
| Kohlrabi | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 4-7 days | Pet-safe |
| Kohlrabi 'Winner' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil dries, about every 3-5 days; target roughly 2.5 cm of water weekly | Pet-safe |
| Korean feather reed grass | Bright indirect light (just back from a sunny window) | Water deeply 1-2 times weekly; keep soil consistently moist but not waterlogged | Pet-safe |
| Korean Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; moderately drought-tolerant once mature | Pet-safe |
| Korean Pine | Direct sun (at least 4-6 hours) | Keep young trees evenly moist; water established trees in prolonged drought | Pet-safe |
| Korean Spice Viburnum | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry, about weekly while establishing | Pet-safe |
| Kotschyan Aerangis | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; every 10-14 days during winter rest | Pet-safe |
| Kousa Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering while establishing | Pet-safe |
| Kucynjak's Columnea | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Kuma Bamboo Grass | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season, reduce in winter | Pet-safe |
| Kupper's Werauhia | Bright indirect light (just back from a sunny window) | Refill tank weekly; water substrate every 1-2 weeks when top layer is dry | Pet-safe |
| Labrador violet | Medium indirect light (a couple of metres from a window) | Every 5–7 days; keep consistently moist | Pet-safe |
| 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 Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil starts to dry, roughly every 3-5 days indoors | Pet-safe |
| Lady Finger Banana | Direct sun (at least 4-6 hours) | Keep consistently moist; water when the top 2-3 cm of soil dries, roughly every 2-4 days in warm growth | Pet-safe |
| Lady Finger Cactus | Direct sun (at least 4-6 hours) | Roughly every 2-3 weeks in summer; far less in winter | Pet-safe |
| Lady of the Night | Bright indirect light (just back from a sunny window) | 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 |
| Ladybird Scarlet cosmos | Direct sun (at least 4-6 hours) | Weekly; allow soil surface to dry between waterings | Pet-safe |
| Laelia anceps | Bright indirect light (just back from a sunny window) | Every 5-7 days when growing; reduce sharply through winter rest | Pet-safe |
| Laelia purpurata | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; less in the cooler rest, every 10-14 days | Pet-safe |
| Laelia rubescens | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; very sparingly in the long dry rest | Pet-safe |
| Laguna Beach Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days from autumn through spring; withhold almost entirely in summer | Pet-safe |
| Lamellate Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; every 3–4 days in cooler months | Pet-safe |
| Lance Brassia | Bright indirect light (just back from a sunny window) | Once or twice per week in active growth; reduce to every 10–14 days in cooler months | Pet-safe |
| Lance-leaf Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days in winter and spring (active season); withhold almost entirely in summer | Pet-safe |
| Lance-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Lance-leaf Stelis | Medium indirect light (a couple of metres from a window) | Every 2–3 days; never allow the medium to dry completely | Pet-safe |
| Lanceleaf Coreopsis | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly to establish, then rarely | Pet-safe |
| Langsat | Bright indirect light (just back from a sunny window) | 2–3 times per week; more frequently in dry season | Pet-safe |
| Lansberg's Restrepia | Bright indirect light (just back from a sunny window) | Every 2-4 days; evenly moist but not waterlogged | Pet-safe |
| Larch-leaved Sandwort | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; minimal in winter | Pet-safe |
| large blue fescue | Direct sun (at least 4-6 hours) | Low to moderate; water every 7–10 days during active growth, monthly once established | Pet-safe |
| Large Chain Orchid | Bright indirect light (just back from a sunny window) | Every 5-7 days during active growth; reduce to every 10-14 days in winter | 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 Bellwort | Medium indirect light (a couple of metres from a window) | Moderate; water regularly during spring and early summer growth. Established plants tolerate summer drought. | Pet-safe |
| Large-Flowered 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 Stanhopea | Bright indirect light (just back from a sunny window) | Frequently during growing season; reduce by half in winter | Pet-safe |
| Large-Leaf Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Large-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; much less in winter | Pet-safe |
| Large-Leaved Drymonia | Medium indirect light (a couple of metres from a window) | Every 5–8 days; allow top 2 cm to dry slightly between waterings | Pet-safe |
| Large-leaved Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days; adjust based on temperature and pot size | Pet-safe |
| Large-Spike Peperomia | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks (allow top half to two-thirds of soil to dry) | Pet-safe |
| large-stalked sinningia | Bright indirect light (just back from a sunny window) | Every 7–14 days in active growth; withhold through dormancy | Pet-safe |
| Large-Vein Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days during the growing season; every 3–4 weeks in winter | Pet-safe |
| 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 |
| Laurustinus Viburnum | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry; weekly while establishing, then occasional | Pet-safe |
| Lauterbach's Fan Palm | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in cooler months | Pet-safe |
| Lawes' Dendrobium | Bright indirect light (just back from a sunny window) | Freely in the growing season (every 2-4 days); reduce to very minimal in the dry winter rest | Pet-safe |
| Lawi Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in autumn and winter | Pet-safe |
| Lead Plant | Direct sun (at least 4-6 hours) | Deeply once every 2–3 weeks during the first growing season; essentially no supplemental irrigation once established | Pet-safe |
| Leaf Celery | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil consistently moist | 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 |
| Lebanese Oregano | Direct sun (at least 4-6 hours) | Every 10–14 days when established; weekly for plants in containers during summer | Pet-safe |
| 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 Ice Plant | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in spring-summer; very sparingly in winter (once every 3-4 weeks) | 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 |
| Lemon Basil | Direct sun (at least 4-6 hours) | Every 2–3 days in warm conditions | Pet-safe |
| Lemon Basil | Direct sun (at least 4-6 hours) | Every 2–3 days during active growth | Pet-safe |
| Lemon Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-3 days in warm weather | Pet-safe |
| 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 Catnip | Direct sun (at least 4-6 hours) | Every 7–10 days once established; more frequent for new transplants | Pet-safe |
| Lemon Thyme | Direct sun (at least 4-6 hours) | Every 7–14 days once established; more frequently in summer heat | Pet-safe |
| Lemon Thyme | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 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 |
| Lentil | Direct sun (at least 4-6 hours) | Every 7–10 days; reduce at maturity | Pet-safe |
| Lettuce Leaf Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in warm weather | Pet-safe |
| Levant Sage | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season once established; infrequently in winter | Pet-safe |
| Liatris spicata | Direct sun (at least 4-6 hours) | When the top 3-4 cm is dry; roughly weekly while establishing | Pet-safe |
| Liatris spicata 'Kobold' | Direct sun (at least 4-6 hours) | When the top 3-4 cm is dry; about weekly while establishing | Pet-safe |
| Lichang Chirita | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Licorice Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Licuri Palm | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days or less | Pet-safe |
| Light Prince Goldfish Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and summer; every 10–14 days in autumn and winter | Pet-safe |
| Lilac Sage | Bright indirect light (just back from a sunny window) | Water when the top 5 cm of soil is dry | Pet-safe |
| Liliana's Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Lime Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Lincoln Pea | Direct sun (at least 4-6 hours) | Every 2–3 days; increase to daily during pod fill | Pet-safe |
| Linden-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow soil to partially dry) | Pet-safe |
| Lindley's Barkeria | Bright indirect light (just back from a sunny window) | Freely every 5-7 days in active growth; almost completely dry (once every 3-4 weeks) from leaf drop until new growth emerges | 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 Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 7-10 days in growth | Pet-safe |
| Liquorice Blue Korean Mint | Direct sun (at least 4-6 hours) | Every 5–7 days; reduce in winter | Pet-safe |
| Liriodendron tulipifera | Direct sun (at least 4-6 hours) | Deep soak weekly in the first two or three growing seasons, then rely on rainfall | Pet-safe |
| Lithops Divergens | Direct sun (at least 4-6 hours) | Only in autumn and spring growth, sparingly when soil is bone dry; no water during summer or mid-winter rest | Pet-safe |
| Lithops Julii | Bright indirect light (just back from a sunny window) | During spring and autumn growth only, roughly every 2-3 weeks; none in summer or winter | Pet-safe |
| Lithops Optica 'Rubra' | Bright indirect light (just back from a sunny window) | Sparingly in spring and autumn, every 2-3 weeks; withhold entirely in summer and winter | Pet-safe |
| Lithops Pseudotruncatella | Direct sun (at least 4-6 hours) | Very infrequently, following the seasonal cycle rather than a fixed schedule | Pet-safe |
| Lithops Salicola | Bright indirect light (just back from a sunny window) | Only during active growth (autumn and spring), roughly every 2-3 weeks; none in summer or deep winter | Pet-safe |
| Little Bluestem | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; minimal once established | Pet-safe |
| Little Bunny Fountain Grass | Direct sun (at least 4-6 hours) | Weekly while establishing in the first season, then only during prolonged drought | Pet-safe |
| Little Gem Lettuce | Direct sun (at least 4-6 hours) | Keep soil consistently moist, watering every 1-2 days in warm weather | Pet-safe |
| Little Gem Magnolia | Direct sun (at least 4-6 hours) | Weekly while establishing (1–3 years); deep watering in summer drought thereafter | Pet-safe |
| Little Leather Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep roots evenly moist | Pet-safe |
| little silver spider grass | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; reduce significantly in winter | Pet-safe |
| Living 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 |
| Livistona Decipiens | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Lobed Tickseed | Bright indirect light (just back from a sunny window) | Low to moderate; drought-tolerant but benefits from occasional watering | Pet-safe |
| Lobster Flower | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; monthly or less in winter | Pet-safe |
| Loch Ness Blackberry | Direct sun (at least 4-6 hours) | Water deeply during dry spells, especially while flowering and swelling fruit; aim for consistently moist soil | Pet-safe |
| London Pride | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; less in winter | Pet-safe |
| London Pride | Medium indirect light (a couple of metres from a window) | Weekly during dry spells; little additional watering needed in temperate climates | Pet-safe |
| Long Spider Orchid | Bright indirect light (just back from a sunny window) | Every 3–4 days in active growth; every 2–3 weeks in winter | Pet-safe |
| Long-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-Haired Zygopetalum | Bright indirect light (just back from a sunny window) | Every 3–4 days in growth, reduce to weekly in winter | Pet-safe |
| Long-leaf Parlor Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; reduce to every 10–14 days in winter | Pet-safe |
| Long-leaf Parlour Palm | Medium indirect light (a couple of metres from a window) | Every 10–14 days in summer, every 2–3 weeks in winter | Pet-safe |
| Long-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season, monthly in winter | Pet-safe |
| Long-Leaved Pachyphytum | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; every 4–6 weeks in autumn and winter | Pet-safe |
| Long-leaved speedwell | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in winter | Pet-safe |
| Long-Petaled Deuterocohnia | 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 | Pet-safe |
| Long-stamen Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Long-Stemmed Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days; allow soil to dry fully | Pet-safe |
| 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 |
| Longleaf Phlox | Direct sun (at least 4-6 hours) | Every 14–21 days when establishing; minimal supplemental water once established | Pet-safe |
| Loranthus-leaf Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 2-3 days; keep evenly moist | Pet-safe |
| Lorentz's Deuterocohnia | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 14-21 days in the growing season; minimal in winter | Pet-safe |
| Loscosi's Thyme | Direct sun (at least 4-6 hours) | Very low — drought-tolerant; water only during establishment | Pet-safe |
| Lotax Dragon Orchid | Medium indirect light (a couple of metres from a window) | Every 2–3 days; never fully dry | Pet-safe |
| Loulu Palm | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| Loving Touch Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in summer | Pet-safe |
| Lowbush Blueberry | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-6 days; tolerates short dry spells once established | Pet-safe |
| 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 |
| Lungwort 'Bertram Anderson' | Medium indirect light (a couple of metres from a window) | Every 7-10 days; somewhat more drought-tolerant than other pulmonarias but still prefers consistent moisture | Pet-safe |
| Luzon Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; reduce slightly in cooler months | Pet-safe |
| Ly's Wax Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Lycaste skinneri | Bright indirect light (just back from a sunny window) | Every 5-7 days in active growth; reduce sharply after leaf drop, roughly every 2-3 weeks in winter rest | Pet-safe |
| Lydian Stonecrop | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Pet-safe |
| Lyme Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Macarthur Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days during growing season; reduce in cooler months | Pet-safe |
| Macho Fern | Medium indirect light (a couple of metres from a window) | Every 2–4 days in summer; every 5–7 days in winter | Pet-safe |
| Madagascar Feather Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in warm conditions; every 10–14 days in cooler periods | Pet-safe |
| Madame Alfred Carriere Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly when establishing; mature plants when the top few centimetres of soil dry, and they tolerate some drought | Pet-safe |
| Madame Butterfly snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; keep evenly moist | Pet-safe |
| Madame Lemoine Lilac | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days; established plants are drought-tolerant | Pet-safe |
| 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 |
| Madonna White Snapdragon | Direct sun (at least 4-6 hours) | When the top 2–3 cm of soil is dry, roughly every 5–7 days | Pet-safe |
| Magdalene Angraecum | Bright indirect light (just back from a sunny window) | Regular watering spring–autumn; reduce markedly in winter | Pet-safe |
| magic star stromanthe | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Magnificent Columnea | Bright indirect light (just back from a sunny window) | Every 4–7 days during active growth; every 10–14 days in winter | Pet-safe |
| Magnolia 'Elizabeth' | Direct sun (at least 4-6 hours) | Weekly during the first few years and in summer droughts | Pet-safe |
| Magnolia 'Jane' | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the first two years, then during dry spells | Pet-safe |
| Magnolia 'Susan' | Direct sun (at least 4-6 hours) | Keep moist while establishing; water deeply weekly in dry spells for the first few years | Pet-safe |
| Magnolia grandiflora 'Gallissonnière' | Direct sun (at least 4-6 hours) | Weekly deep watering in the first 2-3 years, then only during prolonged dry spells | Pet-safe |
| Magnolia wilsonii | Bright indirect light (just back from a sunny window) | Weekly while establishing and during dry summer spells | Pet-safe |
| Mahonia aquifolium Apollo | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly through the first year then occasionally | Pet-safe |
| Mahonia Charity | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly to establish then chiefly during droughts | Pet-safe |
| Mahonia Pinnacle | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly through the first year then occasionally | Pet-safe |
| Mahonia repens | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly to establish then rarely | Pet-safe |
| Mahonia Soft Caress | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, about weekly and more attentively than spinier mahonias | Pet-safe |
| Mahonia Winter Sun | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly while establishing then only in dry spells | Pet-safe |
| Maiden Grass | Direct sun (at least 4-6 hours) | Weekly during the first growing season; every 2–3 weeks once established | Pet-safe |
| Maidenhair fern | Medium indirect light (a couple of metres from a window) | Keep evenly moist — often every 2-3 days | Pet-safe |
| Maire's fescue | Direct sun (at least 4-6 hours) | Low; water every 2–3 weeks during dry spells; once established, relies on natural rainfall in most temperate climates | Pet-safe |
| Malepartus silver grass | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in autumn; minimal in winter | Pet-safe |
| Maltese cross | Direct sun (at least 4-6 hours) | Every 5–7 days in the growing season; less in cool or wet periods | Pet-safe |
| 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 |
| Mandianum Blue Star Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in the growing season | Pet-safe |
| Mangel-wurzel | Direct sun (at least 4-6 hours) | Every 5–7 days when established; more frequently in dry spells | Pet-safe |
| Manna Ash | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Many Fingers | Direct sun (at least 4-6 hours) | Every 2 weeks in spring and summer; every 4–6 weeks in autumn and winter | Pet-safe |
| Many-Flowered Air Plant | Bright indirect light (just back from a sunny window) | Mist 1–2 times per week, or a 20-minute soak every 1–2 weeks | Pet-safe |
| many-flowered cape primrose | Medium indirect light (a couple of metres from a window) | Every 10–14 days; allow soil to dry between waterings | Pet-safe |
| Many-haired Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; almost dry in winter | Pet-safe |
| Many-Headed Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and essentially none in winter | 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 Liveforever | Direct sun (at least 4-6 hours) | Every 2–3 weeks autumn through late spring; none in summer | Pet-safe |
| Manzanilla olive | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; minimal in winter | Pet-safe |
| Mapu Fan Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Mara des Bois Strawberry | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Marble Bromeliad | Bright indirect light (just back from a sunny window) | Refresh central cup weekly; water soil every 2–3 weeks | Pet-safe |
| Marble Houseleek | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; once a month or less in winter | Pet-safe |
| Marbled Living 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 |
| Marcgrave's Nidularium | Medium indirect light (a couple of metres from a window) | Weekly cup refill; medium kept lightly moist | Pet-safe |
| Marginal Wood Fern | Low light (north window or shaded room) | Keep evenly moist while establishing; water deeply during droughts, about every 7-10 days in dry summers | Pet-safe |
| 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 |
| Marketmore Cucumber | Direct sun (at least 4-6 hours) | Every 2-3 days to keep soil consistently moist; more often in heat | Pet-safe |
| Marmalade Heuchera | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Marram Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant | Pet-safe |
| Marshall's Thunia | Bright indirect light (just back from a sunny window) | Water freely every 2-4 days during vigorous summer growth; reduce sharply from autumn as leaves yellow, then keep almost dry (monthly) through winter dormancy | Pet-safe |
| Martius Fan Palm | Direct sun (at least 4-6 hours) | Weekly during establishment; once established, every 2–3 weeks depending on rainfall | Pet-safe |
| Martius's Brassavola | Bright indirect light (just back from a sunny window) | Every 5–7 days during growing season; reduce in winter after flowering | Pet-safe |
| Masdevallia Angel Frost | Medium indirect light (a couple of metres from a window) | Keep evenly moist year-round, watering about every 2-4 days so the medium never dries out | Pet-safe |
| Masdevallia coccinea | Medium indirect light (a couple of metres from a window) | Keep evenly moist all year, watering about every 2-4 days so the medium never dries fully | Pet-safe |
| Masdevallia tovarensis | Medium indirect light (a couple of metres from a window) | Keep evenly moist throughout the year, watering roughly every 2-4 days so the medium stays damp | Pet-safe |
| Masdevallia veitchiana | Medium indirect light (a couple of metres from a window) | Keep roots evenly moist year-round; water roughly every 2-4 days so the mix never fully dries | Pet-safe |
| Masters' Larch | Direct sun (at least 4-6 hours) | Weekly during first 2 years; monthly once established | Pet-safe |
| Matted Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks; very sparingly in winter | Pet-safe |
| Matthiola incana 'Katz Sakura' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water every 3-5 days, more in heat | Pet-safe |
| Maudiae Slipper Orchid | Low light (north window or shaded room) | Every 5–7 days | Pet-safe |
| Maughan's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–4 weeks in autumn growth phase; none during summer dormancy | Pet-safe |
| Maury's Air Plant | Direct sun (at least 4-6 hours) | Mist or soak every 10–14 days | Pet-safe |
| Maximilian Sunflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal supplemental irrigation needed | Pet-safe |
| May Night Salvia | Direct sun (at least 4-6 hours) | When top 3-5 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| Mayhaw | Direct sun (at least 4-6 hours) | Keep soil consistently moist, especially while fruit is sizing | Pet-safe |
| Meadow Blazing Star | Direct sun (at least 4-6 hours) | Keep evenly moist to medium; water during dry spells | Pet-safe |
| meadow fountain grass | Direct sun (at least 4-6 hours) | Weekly when new; every 2–3 weeks once established | Pet-safe |
| Meadow Oat Grass | Direct sun (at least 4-6 hours) | Low; very drought-tolerant | Pet-safe |
| Mealy-cup Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days when young; every 10-14 days once established | Pet-safe |
| Mealycup Sage 'Victoria Blue' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; roughly weekly, less once established | Pet-safe |
| Mediterranean Fan Palm | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Mediterranean feather grass | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; minimal in winter | Pet-safe |
| Medusa Orchid | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water every 2-4 days, more in heat | Pet-safe |
| 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 |
| Meech's Prolific quince | Direct sun (at least 4-6 hours) | Weekly during summer; reduce from early autumn | Pet-safe |
| 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 |
| Merlot Lettuce | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 3-5 days | 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 Aechmea | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); refresh central tank monthly | Pet-safe |
| Mexican Blue Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; reduce to every 3-4 weeks in winter | Pet-safe |
| Mexican Fence Post Cactus | Direct sun (at least 4-6 hours) | When the top half of soil is dry, roughly every 10-14 days in summer; every 4-6 weeks in winter | Pet-safe |
| Mexican Fleabane | Direct sun (at least 4-6 hours) | Every 10–14 days during active growth; minimal once established | Pet-safe |
| Mexican Hat | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very drought-tolerant | Pet-safe |
| Mexican Lime Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and every 4-6 weeks in winter | Pet-safe |
| 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 Pinyon | Direct sun (at least 4-6 hours) | Sparingly; deep but infrequent watering, then largely rainfall-dependent | Pet-safe |
| Mexican Sage | Direct sun (at least 4-6 hours) | Weekly during active growth | Pet-safe |
| Mexican Snowball | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly in winter | Pet-safe |
| Mexican zinnia | Direct sun (at least 4-6 hours) | Once or twice weekly; allow the top 2–3 cm of soil to dry between waterings | Pet-safe |
| Meyer's Cape Primrose | Bright indirect light (just back from a sunny window) | Every 10-14 days in growth; every 4-6 weeks in winter | Pet-safe |
| Meyer's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer (August/September) through autumn; withheld completely from May to August | Pet-safe |
| Middendorf Weigela | Bright indirect light (just back from a sunny window) | Every 7 days during dry periods; keep evenly moist but not waterlogged | Pet-safe |
| Mignonette | Direct sun (at least 4-6 hours) | Every 5–7 days; do not allow to dry out completely | Pet-safe |
| Mignonette Alpine Strawberry | Bright indirect light (just back from a sunny window) | Every 2–3 days in growing season; weekly in cool or dormant periods | Pet-safe |
| Mignonette Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Milky bellflower | Direct sun (at least 4-6 hours) | Weekly during dry periods; moderate water requirements | Pet-safe |
| Milky Way Kousa Dogwood | Bright indirect light (just back from a sunny window) | Weekly while establishing; deep watering in summer drought | Pet-safe |
| 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 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 |
| Min Fir | Direct sun (at least 4-6 hours) | Regularly during establishment; moderate thereafter | Pet-safe |
| Miniature Cone Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days during active growth (autumn–spring); completely dry through summer dormancy | Pet-safe |
| Miniature Desert Rose | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Pet-safe |
| Miniature Pumpkin | Direct sun (at least 4-6 hours) | Every 2–3 days | Pet-safe |
| Miniature Sugar Palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; every 14 days in winter | Pet-safe |
| 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 |
| Miss Grace Dawn Redwood | Direct sun (at least 4-6 hours) | Weekly or more in dry periods; tolerates wet soils | Pet-safe |
| Miss Willmott's Ghost | Direct sun (at least 4-6 hours) | Low — once established, water only during prolonged drought | 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 |
| Mister Lincoln Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Mizuna | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Mockernut Hickory | Direct sun (at least 4-6 hours) | Water young trees in dry spells; mature trees are drought-tolerant | Pet-safe |
| Modoc Cypress | Direct sun (at least 4-6 hours) | Minimal once established; drought-tolerant | Pet-safe |
| Monarch Birch | Direct sun (at least 4-6 hours) | Regular watering for first 2–3 years; moderate once established | Pet-safe |
| Mondo Grass | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Mongolian Linden | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks in dry summers | Pet-safe |
| Monk's Hood Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in the growing season; keep dry in winter | Pet-safe |
| Monk's Hood Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 10-14 days in summer; every 4-6 weeks or less in winter | 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 |
| Monkey Jack | Direct sun (at least 4-6 hours) | Water young trees 2–3 times per week; established trees are moderately drought-tolerant and generally managed on natural rainfall in tropical climates. | Pet-safe |
| Monstrose Apple Cactus | Direct sun (at least 4-6 hours) | When the mix is dry, roughly every 10-14 days in summer; minimal in winter | Pet-safe |
| Montezuma Cypress | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water deeply every 7-14 days, more frequently in heat | Pet-safe |
| 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 |
| Moonstones | Bright indirect light (just back from a sunny window) | Every 2 to 3 weeks in active growth; roughly monthly or less in winter | Pet-safe |
| Moor Witch Purple Moor Grass | Bright indirect light (just back from a sunny window) | Moderate to frequent — prefers reliably moist soil; dislikes drought | Pet-safe |
| Moore's Blechnum | Medium indirect light (a couple of metres from a window) | Every 5–7 days in summer, every 10–14 days in winter | Pet-safe |
| Moore's Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Morell's Billbergia | Bright indirect light (just back from a sunny window) | Keep central cup filled; water substrate every 1-2 weeks | Pet-safe |
| Morning Light Maiden Grass | Direct sun (at least 4-6 hours) | Weekly for the first growing season; every 2–3 weeks once established | Pet-safe |
| Moroccan Sea Holly | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established, water sparingly in winter | Pet-safe |
| 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 |
| Mosaic Bromeliad | Medium indirect light (a couple of metres from a window) | Top up the central urn weekly; water the potting mix every 2–3 weeks | Pet-safe |
| Mosaic Vase Plant | Medium indirect light (a couple of metres from a window) | Keep urn filled; water medium every 10–14 days | Pet-safe |
| Moso Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in the growing season; weekly in winter | Pet-safe |
| Mosquito Plant | Direct sun (at least 4-6 hours) | Every 7–14 days once established; more frequent when young | Pet-safe |
| Moss Phlox | Direct sun (at least 4-6 hours) | Moderate — water during establishment and dry spells | Pet-safe |
| Moss-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Mother of Hundreds | Direct sun (at least 4-6 hours) | Every 10-14 days in spring-summer when the top 3 cm of soil is dry; every 4-6 weeks in autumn and winter | Pet-safe |
| Moudry Black Fountain Grass | Direct sun (at least 4-6 hours) | Weekly during establishment, then occasional deep watering in dry spells | Pet-safe |
| Mountain Alyssum | Direct sun (at least 4-6 hours) | Every 14–21 days during growth; minimal in winter | Pet-safe |
| Mountain Bluebells | Bright indirect light (just back from a sunny window) | Water deeply 2–3 times per week; does not tolerate drying out | Pet-safe |
| Mountain Cornflower | Direct sun (at least 4-6 hours) | Weekly in the first season; established plants are drought-tolerant and rarely need watering | Pet-safe |
| Mountain Desert Sage | Direct sun (at least 4-6 hours) | Very low once established; xeric to moderate | Pet-safe |
| Mountain Everlasting | Direct sun (at least 4-6 hours) | Every 2–3 weeks during growing season; minimal in winter | Pet-safe |
| Mountain Hemlock | Direct sun (at least 4-6 hours) | Weekly during establishment; relies on rainfall and snowmelt once established | Pet-safe |
| Mountain Lemon Thyme | Direct sun (at least 4-6 hours) | Low — water sparingly; drought-tolerant once established | Pet-safe |
| Mountain Phlox | Medium indirect light (a couple of metres from a window) | Weekly; allow the top 2–3 cm of soil to dry between waterings | Pet-safe |
| Mountain Sandwort | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Pet-safe |
| Mountain Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season, every 14–21 days in winter | Pet-safe |
| Mourning Holly Fern | Low light (north window or shaded room) | Every 5–7 days in the growing season, every 10–14 days in winter | Pet-safe |
| Mouse-Tail Air Plant | Bright indirect light (just back from a sunny window) | Mist or soak every 10–14 days | Pet-safe |
| Mrs D.F. Maxwell Cornish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Muir's Rhinephyllum | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring–summer; minimal in winter | Pet-safe |
| Muir's Sage | Direct sun (at least 4-6 hours) | Low; drought tolerant once established | Pet-safe |
| Mulberry 'Shangri-La' | Direct sun (at least 4-6 hours) | Every 5-10 days in growth, more often in containers; drought-tolerant once established in ground | Pet-safe |
| Mulberry Illinois Everbearing | Direct sun (at least 4-6 hours) | Water deeply weekly while establishing; mature trees need water only in extended drought | Pet-safe |
| Mung Bean | Direct sun (at least 4-6 hours) | Once or twice per week | Pet-safe |
| Musk Mallow | Direct sun (at least 4-6 hours) | Low to moderate once established | Pet-safe |
| Myretoun Ruby winter heath | Direct sun (at least 4-6 hours) | Weekly for new plants in the first season; every 2–3 weeks for established plants during dry spells | Pet-safe |
| Nahoum's Alcantarea | Direct sun (at least 4-6 hours) | Refill the central tank every 7-10 days; water substrate sparingly — only when completely dry | Pet-safe |
| Naked Bamboo | Medium indirect light (a couple of metres from a window) | 2-3 times per week in growing season; reduce in winter | Pet-safe |
| Namaqualand Cheiridopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn through early spring; completely dry June–August | Pet-safe |
| Namaqualand Sage | Direct sun (at least 4-6 hours) | Low; sparingly once established | Pet-safe |
| Nance | Direct sun (at least 4-6 hours) | Every 14–21 days; highly drought-tolerant when established | Pet-safe |
| Nandina Liriope | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Nantes Carrot | Direct sun (at least 4-6 hours) | Every 2–3 days; Nantes types are less drought-tolerant than Danvers | Pet-safe |
| Napa Cabbage 'Bilko' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil dries, about every 2-4 days; provide roughly 2.5-4 cm of water weekly | Pet-safe |
| Napa Cabbage 'Blues' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil dries, about every 2-4 days; roughly 2.5-4 cm of water weekly | Pet-safe |
| Napa Cabbage 'Minuet' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil dries, about every 2-4 days; roughly 2.5-4 cm of water weekly | Pet-safe |
| Narrow Holly Fern | Medium indirect light (a couple of metres from a window) | Every 7–14 days; drought-tolerant once established | Pet-safe |
| narrow small-reed | Direct sun (at least 4-6 hours) | Keep constantly moist to wet; suited to boggy, saturated, or seasonally flooded soils | Pet-safe |
| Narrow-Leaf Coneflower | Direct sun (at least 4-6 hours) | Water to establish in year one, then only in prolonged drought | Pet-safe |
| Narrow-Leaf Fountain Bamboo | Medium indirect light (a couple of metres from a window) | 2-3 times per week in warm months; weekly in cool weather | Pet-safe |
| Narrow-leaf Zinnia | Direct sun (at least 4-6 hours) | When top 3-4 cm of soil is dry, roughly every 5-10 days | Pet-safe |
| Narrow-Leaved Ash | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Narrow-Leaved Evening Primrose | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Narrow-leaved Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Narrow-Leaved Spleenwort | Low light (north window or shaded room) | Every 2–3 days in warm months; reduce in winter | Pet-safe |
| Narrowleaf Mountain Mint | Direct sun (at least 4-6 hours) | Low to moderate — drought-tolerant once established | Pet-safe |
| 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 |
| Nasturtium | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Nasturtium 'Alaska' | Direct sun (at least 4-6 hours) | Water to establish, then moderately; let the top dry between waterings, about weekly unless dry | Pet-safe |
| Nasturtium 'Empress of India' | Direct sun (at least 4-6 hours) | Water until established, then moderately; let the surface dry between, roughly weekly unless dry | Pet-safe |
| Natai Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in warm conditions; every 14 days in cooler periods | Pet-safe |
| Natal Plum Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days in growth | Pet-safe |
| 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 |
| Neanthe Bella Palm | Low light (north window or shaded room) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Nearly Wild Rose | Direct sun (at least 4-6 hours) | Deeply once a week, more in heat | Pet-safe |
| Neat Bulbophyllum | Medium indirect light (a couple of metres from a window) | Every 4–6 days; mounted plants may need more frequent misting | Pet-safe |
| 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 |
| Nemesia 'Sunsatia Cranberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Nemesia strumosa 'Poetry Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Nepenthes 'Miranda' | Bright indirect light (just back from a sunny window) | Keep media constantly moist; water every 2-4 days with mineral-free water | Pet-safe |
| Nepenthes ampullaria | Bright indirect light (just back from a sunny window) | Keep the medium constantly moist, watering every 2-3 days; it likes more water than highland species | Pet-safe |
| Nepenthes rajah | Bright indirect light (just back from a sunny window) | Keep the medium evenly moist at all times, watering every 2-4 days so it never dries out | Pet-safe |
| Nepenthes truncata | Bright indirect light (just back from a sunny window) | Keep the medium evenly moist, watering every 2-4 days so it never fully dries | Pet-safe |
| Nerved Catmint | Direct sun (at least 4-6 hours) | Every 7–10 days in the growing season; much less in winter | 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 |
| 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 |
| Netted Chain Fern | Low light (north window or shaded room) | Freely — keep soil moist to seasonally wet | Pet-safe |
| Nettleleaf Giant Hyssop | Direct sun (at least 4-6 hours) | Every 5–7 days in the growing season; less in winter | Pet-safe |
| Nevada Bitterroot | Direct sun (at least 4-6 hours) | Moderate in spring; completely dry in summer dormancy | Pet-safe |
| New Dawn Rose | Direct sun (at least 4-6 hours) | Deeply once a week in the growing season; more during establishment or drought | Pet-safe |
| New England Aster 'Purple Dome' | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply during dry spells, about weekly | Pet-safe |
| New Guinea Impatiens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 1-3 days in warm weather | Pet-safe |
| New Mexico Giant Hyssop | Direct sun (at least 4-6 hours) | Every 7–14 days once established | Pet-safe |
| New York aster | Direct sun (at least 4-6 hours) | Weekly during the growing season; less frequent once established in cool climates | Pet-safe |
| New Zealand Spinach | Direct sun (at least 4-6 hours) | Once or twice per week | Pet-safe |
| New Zealand Tree Fern | Bright indirect light (just back from a sunny window) | Consistently moist — water 2-3 times per week during dry spells in the growing season | Pet-safe |
| New Zealand Tree Fuchsia | Bright indirect light (just back from a sunny window) | Regular — consistent moisture | Pet-safe |
| Nicaraguan Columnea | Bright indirect light (just back from a sunny window) | Every 5–8 days in growing season; every 10–14 days in winter | Pet-safe |
| Night Sky Petunia | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of compost feels dry, typically every 2-4 days in warm weather; containers may need daily watering in midsummer heat | Pet-safe |
| Nihoa Palm | Direct sun (at least 4-6 hours) | When the top 5-7 cm of soil is dry, roughly every 10-21 days | Pet-safe |
| Nikko Fir | Direct sun (at least 4-6 hours) | Weekly when establishing; reduced once established | Pet-safe |
| Nile Sage | Bright indirect light (just back from a sunny window) | Moderate; consistent moisture preferred | Pet-safe |
| Ninja Foamflower | Medium indirect light (a couple of metres from a window) | Every 5–7 days; increase in warm or dry periods | Pet-safe |
| Noble Carrion Flower | Bright indirect light (just back from a sunny window) | Every 14–21 days in the growing season; once monthly or less in winter | Pet-safe |
| Noble Cymbidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; every 10–14 days in winter | Pet-safe |
| Noble Fir | Direct sun (at least 4-6 hours) | Regular watering during establishment; naturally sustained by Pacific Northwest rainfall | Pet-safe |
| Nodding Sage | Direct sun (at least 4-6 hours) | Low to moderate; allow soil to dry between waterings | Pet-safe |
| Nootka Cypress | Direct sun (at least 4-6 hours) | Regularly during establishment; tolerates wet or dry once mature | Pet-safe |
| Nordmann Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; relies on rainfall once established | Pet-safe |
| Northern Blazing Star | Direct sun (at least 4-6 hours) | Every 1-2 weeks once established; more often during establishment | Pet-safe |
| Northern Japanese Hemlock | Bright indirect light (just back from a sunny window) | Weekly during growing season; less in winter | Pet-safe |
| Northern Maidenhair Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days | Pet-safe |
| Northern Needleleaf Air Plant | Bright indirect light (just back from a sunny window) | Soak once a week; mist every 2–3 days | Pet-safe |
| Northline saskatoon | Direct sun (at least 4-6 hours) | Weekly during dry periods; moderate once established | Pet-safe |
| Northwind Switchgrass | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks when mature | Pet-safe |
| 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 |
| Nottingham medlar | Direct sun (at least 4-6 hours) | Regular during the first 2 years; moderate once established | Pet-safe |
| Novak's Air Plant | Bright indirect light (just back from a sunny window) | Mist thoroughly 2–3 times per week in warm conditions; reduce to once per week in cool, low-humidity winters. | Pet-safe |
| Nude Sheath Bamboo | Direct sun (at least 4-6 hours) | Weekly during the growing season; every 2–3 weeks when dormant | Pet-safe |
| Nummularioides Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-10 days in the growing season; roughly every 2 weeks in winter | Pet-safe |
| Oak Leaf Lettuce | Direct sun (at least 4-6 hours) | Keep evenly moist; water every 2-3 days, more in heat | Pet-safe |
| Obscura Wax Plant | Bright indirect light (just back from a sunny window) | Every 10-14 days in growth; every 2-3 weeks in winter | Pet-safe |
| Ochre Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to once every 2–3 weeks in winter rest | Pet-safe |
| October Daphne | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; minimal in winter dormancy | Pet-safe |
| Ohio Goldenrod | Direct sun (at least 4-6 hours) | Moderate to high — keep soil consistently moist | Pet-safe |
| Okinawan Sweet Potato | Direct sun (at least 4-6 hours) | Moderate; about 25 mm (1 in) per week, less near harvest | Pet-safe |
| Oklahoma Salmon zinnia | Direct sun (at least 4-6 hours) | Every 3–5 days; adjust for rainfall and temperature | Pet-safe |
| Okra | Direct sun (at least 4-6 hours) | Weekly deep watering | Pet-safe |
| 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 Cactus | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, very little in winter | Pet-safe |
| Old Man Palm | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Old Man 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 |
| old-fashioned weigela | Direct sun (at least 4-6 hours) | Weekly during the first growing season; once or twice per month during dry spells when established | Pet-safe |
| Olive 'Arbequina' | Direct sun (at least 4-6 hours) | When the top few cm of soil are dry; deep then allow to dry | 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 Tree | Direct sun (at least 4-6 hours) | When the top few cm of soil dry out; deep but infrequent watering | Pet-safe |
| Oliver's impatiens | Medium indirect light (a couple of metres from a window) | Every 4–7 days; moderate and consistent | Pet-safe |
| Onward pear | Direct sun (at least 4-6 hours) | Weekly in dry spells during growing season | Pet-safe |
| 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 coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Orange New Zealand sedge | Bright indirect light (just back from a sunny window) | Regular watering until established; moderate thereafter | Pet-safe |
| Orange Stonecrop | Direct sun (at least 4-6 hours) | Every 10-14 days when establishing; virtually rain-fed once mature | Pet-safe |
| Oregano | Direct sun (at least 4-6 hours) | When the top 2 cm is dry, every 7-10 days | 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 |
| Oreocereus trollii | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Oriental Chain Fern | Medium indirect light (a couple of metres from a window) | Regularly — keep soil consistently moist | Pet-safe |
| oriental fountain grass | Direct sun (at least 4-6 hours) | Every 10–14 days once established; more frequent during establishment | Pet-safe |
| Oriental Hornbeam | Direct sun (at least 4-6 hours) | Low once established; water during first 2 seasons only | Pet-safe |
| 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 |
| Orssich's Holiday 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 every 2-3 weeks during the autumn rest | Pet-safe |
| 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 |
| Osmunda spectabilis | Medium indirect light (a couple of metres from a window) | Keep wet to consistently moist at all times; water whenever the surface is not damp | Pet-safe |
| Ospina's Vriesea | Bright indirect light (just back from a sunny window) | Keep cup filled; flush weekly; medium every 2 weeks | Pet-safe |
| Osteospermum 'Akila Daisy White' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 4-7 days | Pet-safe |
| Osteospermum 'Sunny Serena White' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Osteospermum 'Voltage Yellow' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Ostrich Fern | Low light (north window or shaded room) | Keep consistently moist; water whenever the surface starts to dry, often every 3-5 days in growth | 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 |
| Overdam Feather Reed Grass | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks once established | Pet-safe |
| 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 |
| Ozark Beauty Strawberry | Direct sun (at least 4-6 hours) | Every 2–3 days in warm weather; every 4–5 days in cool weather | Pet-safe |
| Pacaya Palm | Medium indirect light (a couple of metres from a window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Pachyphytum bracteosum | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| Pachyphytum compactum | Direct sun (at least 4-6 hours) | When soil is bone dry, about every 2 weeks in growth and rarely in winter | Pet-safe |
| Pachyphytum glutinicaule | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, very sparingly in winter | Pet-safe |
| Pachyphytum hookeri | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Pachyphytum werdermannii | Direct sun (at least 4-6 hours) | When soil is bone dry, roughly every 2 weeks in growth, rarely in winter | Pet-safe |
| Pachyveria 'Clavifolia' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| Pachyveria 'Exotica' | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in growth, minimal in winter | Pet-safe |
| Pachyveria 'Powder Puff' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Pachyveria 'Powder Puff' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, sparingly in winter | Pet-safe |
| Pacific Dogwood | Bright indirect light (just back from a sunny window) | Regular deep watering, especially in summer; do not let the root zone dry out | Pet-safe |
| Pacific Maid Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–3 days; keep evenly moist | Pet-safe |
| Pacific Silver Fir | Bright indirect light (just back from a sunny window) | Regularly during establishment; relies on natural rainfall when mature | Pet-safe |
| Padang Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in growth; every 3–4 weeks in winter | Pet-safe |
| Pagoda Dogwood | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply weekly in the first two seasons and during droughts | Pet-safe |
| Painted Columnea | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in winter | Pet-safe |
| Painted 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 |
| Pak Choi | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil is dry, often every 2-4 days | Pet-safe |
| 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 Purple Coneflower | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry; weekly while establishing, then rarely | Pet-safe |
| Pale Silver Skin Plant | Direct sun (at least 4-6 hours) | Every 2–4 weeks in late summer through autumn (active growth into flowering); water sparingly in spring; completely withheld mid-summer | Pet-safe |
| Pale Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more frequent in first season | Pet-safe |
| Pale-Leaved Sunflower | Direct sun (at least 4-6 hours) | Weekly until established, then every 1-2 weeks | Pet-safe |
| palm sedge | Medium indirect light (a couple of metres from a window) | Consistently moist; water whenever the top 2 cm of soil dries | Pet-safe |
| Palm sedge | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the top 1–2 cm of soil dries out | Pet-safe |
| Palmarosa | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-10 days depending on temperature | Pet-safe |
| Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; thereafter only in prolonged drought | Pet-safe |
| Paper Birch | Direct sun (at least 4-6 hours) | Weekly in the first 3 years; every 10–14 days once established, more in summer heat | Pet-safe |
| Paper Spine Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer and roughly monthly or less in winter | Pet-safe |
| 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 |
| Paris Market Carrot | Direct sun (at least 4-6 hours) | Every 2–3 days in dry weather; weekly when cool | Pet-safe |
| Parrot Feather Bromeliad | Bright indirect light (just back from a sunny window) | Keep cup filled; medium watering every 2 weeks | Pet-safe |
| Partridgeberry | Low light (north window or shaded room) | Keep soil evenly moist; water when the top 1–2 cm begins to dry | Pet-safe |
| Pat Austin Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in hot, dry spells | Pet-safe |
| Paul's Himalayan Musk Rose | Direct sun (at least 4-6 hours) | Deep soak weekly through the first two growing seasons; established plants rarely need watering | Pet-safe |
| Peacock fern | Low light (north window or shaded room) | Keep the substrate evenly moist at all times — never let it dry out | Pet-safe |
| 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 |
| Pecan 'Caddo' | Direct sun (at least 4-6 hours) | Deeply 1-2 times weekly in summer, increasing during kernel fill | Pet-safe |
| Pecan 'Desirable' | Direct sun (at least 4-6 hours) | Deeply 1-2 times weekly through summer; up to 350+ litres per mature tree in peak nut-fill | Pet-safe |
| Pecan 'Elliot' | Direct sun (at least 4-6 hours) | Deeply 1-2 times weekly in summer, more during late-summer kernel fill | Pet-safe |
| Pecan 'Oconee' | Direct sun (at least 4-6 hours) | Water young trees deeply weekly; mature trees need deep irrigation during nut fill (late summer) in dry spells, roughly weekly soaks | Pet-safe |
| Pecan 'Pawnee' | Direct sun (at least 4-6 hours) | Deeply 1-2 times weekly in summer, increasing during August-September kernel fill | Pet-safe |
| Pecan 'Sumner' | Direct sun (at least 4-6 hours) | Deeply 1-2 times weekly in summer, more during August-October kernel fill | Pet-safe |
| Peculiar Cheiridopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn–spring; none in summer | Pet-safe |
| Pedalai | Direct sun (at least 4-6 hours) | Water 3–4 times per week for young trees; established trees in ground need weekly deep irrigation supplemented by natural rainfall. | Pet-safe |
| Pellionia daveauana | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, often every 4-7 days | Pet-safe |
| Pelotazo Mallow | Direct sun (at least 4-6 hours) | Every 10–21 days in summer; monthly or less in winter | Pet-safe |
| Peltate-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days during the growing season; every 3–4 weeks in winter | Pet-safe |
| Pemba Palm | Bright indirect light (just back from a sunny window) | Every 4–6 days in warm months; reduce to every 10–14 days in cooler periods | Pet-safe |
| Pencilled Cranesbill | Medium indirect light (a couple of metres from a window) | Occasional watering during establishment; largely self-sufficient once established | Pet-safe |
| Penisetum massaicum Red Bunny Tails | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about weekly; more often in pots and heat | Pet-safe |
| Penny Mountain Thyme | Direct sun (at least 4-6 hours) | Every 7–14 days once established; drought-tolerant | Pet-safe |
| Peperomia | Medium indirect light (a couple of metres from a window) | When the soil is almost fully dry, every 10-14 days | Pet-safe |
| Peperomia 'Napoli Nights' | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia 'Peppermill' | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia 'Rana Verde' | Bright indirect light (just back from a sunny window) | When top 2-3 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia 'Watermelon' (Ginny hybrid) | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia albovittata | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia angulata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia argyreia 'Soccer Ball' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia arifolia | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia asperula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days | Pet-safe |
| Peperomia clusiifolia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia columella | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-21 days in growth | Pet-safe |
| Peperomia crassifolia | Bright indirect light (just back from a sunny window) | When top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia deppeana | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia dolabriformis | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 14-21 days | Pet-safe |
| Peperomia ecklonii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia emarginella | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is just drying, about every 5-9 days | Pet-safe |
| Peperomia graveolens 'Ruby Glow' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-18 days | Pet-safe |
| Peperomia magnoliifolia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia magnoliifolia 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 8-13 days | Pet-safe |
| Peperomia nitida 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia obtusifolia 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia Pepperspot | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 7-12 days | Pet-safe |
| Peperomia pereskiifolia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia Rosso | Bright indirect light (just back from a sunny window) | When the soil is 50-75% dry, roughly every 10-14 days | Pet-safe |
| Peperomia scandens | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia serpens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia tetragona | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia tetraphylla | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia trifolia | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia verticillata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Perennial Candytuft | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Pereskia-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Perez 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 |
| Perez's Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established; less in winter | Pet-safe |
| Perfoliate Bellwort | Medium indirect light (a couple of metres from a window) | Moderate in spring; established plants are drought-tolerant once dormant. | Pet-safe |
| Perplexing 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 Carpet zinnia | Direct sun (at least 4-6 hours) | Every 5–7 days; highly drought tolerant once established | Pet-safe |
| Persian Catmint | Direct sun (at least 4-6 hours) | Every 7–14 days; less in cooler seasons | Pet-safe |
| Peruvian Apple Cactus | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Pet-safe |
| Peruvian 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 |
| Peruvian zinnia | Direct sun (at least 4-6 hours) | Once or twice weekly; allow the top 3 cm of soil to dry between waterings | Pet-safe |
| Petiole Sundew | Bright indirect light (just back from a sunny window) | Wet tray (October–March in Australia / spring–autumn in cultivation); reduced watering (cooler months) | Pet-safe |
| Petunia 'Supertunia Royal Velvet' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, frequently daily for containers in summer | Pet-safe |
| Petunia 'Supertunia Vista Bubblegum' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, often daily for containers in summer heat | Pet-safe |
| Petunia axillaris | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry; avoid both drought and waterlogging | Pet-safe |
| Peyote-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 |
| Pheasant's Tail Grass | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; minimal in winter | Pet-safe |
| Phegopteris connectilis | Low light (north window or shaded room) | Keep soil evenly moist; water when the top 1-2 cm begins to dry, roughly every 4-6 days in growth | Pet-safe |
| Phegopteris hexagonoptera | Low light (north window or shaded room) | Keep consistently moist; water when the surface starts to dry, about every 4-6 days during growth | Pet-safe |
| Phlomis-Like Sage | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Phlox drummondii 'Intensia Cabernet' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Phlox maculata 'Alpha' | Direct sun (at least 4-6 hours) | Keep evenly moist; water deeply 1-2 times weekly in dry spells, more in heat | Pet-safe |
| Phlox paniculata 'Starfire' | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water deeply about weekly, more in heat and drought | Pet-safe |
| Phlox subulata 'Emerald Blue' | Direct sun (at least 4-6 hours) | Water when soil is dry; drought-tolerant once established | Pet-safe |
| Phragmipedium Eric Young | Bright indirect light (just back from a sunny window) | Keep evenly moist at all times; water every 2-4 days or stand the pot in 1-2 cm of water | Pet-safe |
| Pickle Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks; reduce to monthly or less in winter | Pet-safe |
| Picual olive | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; essentially none in winter dormancy | Pet-safe |
| Pignut Hickory | Direct sun (at least 4-6 hours) | Deep watering every 7-14 days while establishing; drought-tolerant once mature | 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 pubescens | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pilea pumila | Medium indirect light (a couple of metres from a window) | Keep consistently moist; check every 2-4 days | Pet-safe |
| Pilea serpyllacea | Bright indirect light (just back from a sunny window) | When the surface just begins to dry, roughly every 4-7 days | Pet-safe |
| 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 |
| Pincushion flower | Direct sun (at least 4-6 hours) | Once or twice weekly | Pet-safe |
| Pineapple Bromeliad | Bright indirect light (just back from a sunny window) | every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Pineapple guava | Direct sun (at least 4-6 hours) | Weekly during growing season; reduce 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) | Every 2–3 weeks (soil); replenish central cup every 2–4 weeks | 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 |
| Pineleaf Penstemon | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; rarely in winter | Pet-safe |
| Pinemat manzanita | Direct sun (at least 4-6 hours) | Low to moderate; allow soil to dry between waterings once established | Pet-safe |
| Ping Pong Purple globe amaranth | Direct sun (at least 4-6 hours) | Every 5–7 days; allow soil surface to dry slightly | Pet-safe |
| Pink Cascade Tamarisk | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Pink Coreopsis | Direct sun (at least 4-6 hours) | Moderate to high; keep soil evenly moist | Pet-safe |
| Pink Deutzia | Direct sun (at least 4-6 hours) | Every 7-10 days during dry periods; drought-tolerant once established | Pet-safe |
| Pink Dragon Fruit | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Pink Flowering Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering; increase in summer heat | Pet-safe |
| Pink Knock Out Rose | Direct sun (at least 4-6 hours) | About 2.5 cm of water weekly, deep soak | Pet-safe |
| Pink Lemonade Blueberry | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil begins to dry, roughly every 2-4 days in summer | Pet-safe |
| Pink Muhly Grass | Direct sun (at least 4-6 hours) | Every 10-14 days during the first growing season; minimal supplemental irrigation once established | Pet-safe |
| Pink Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; afterwards only in prolonged drought | Pet-safe |
| Pink Panther episcia | Bright indirect light (just back from a sunny window) | Allow the top centimetre of soil to dry before watering — approximately every 5–7 days in the growing season. | Pet-safe |
| Pink Panther Restrepia | Medium indirect light (a couple of metres from a window) | Every 1–2 days; allow the medium to approach dryness but not fully dry | Pet-safe |
| Pink Pewter Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–10 days; increase in dry or sunny spells | Pet-safe |
| Pink Pussytoes | Direct sun (at least 4-6 hours) | Low; water only when soil is completely dry | Pet-safe |
| Pink Velvet Banana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Pink Vygie | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is fully dry, roughly every 7-14 days in spring-summer; very sparingly in winter (once monthly or less) | Pet-safe |
| Pinto Bean | Direct sun (at least 4-6 hours) | Every 3–4 days during growth; taper off during pod-drying phase | Pet-safe |
| Pinyon Pine | Direct sun (at least 4-6 hours) | Water young trees occasionally to establish; mature trees need virtually no irrigation | Pet-safe |
| Piper's Bellflower | Direct sun (at least 4-6 hours) | Sparingly; allow near-drying between waterings | Pet-safe |
| Pirri-Pirri Bur | Direct sun (at least 4-6 hours) | Fortnightly once established; drought-tolerant | Pet-safe |
| Pistachio 'Kerman' | Direct sun (at least 4-6 hours) | Deep soak every 10-14 days in summer once established, none in dormancy | Pet-safe |
| Pitton's Houseleek | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | 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 |
| Plains Coreopsis | Direct sun (at least 4-6 hours) | Low; once established, water only during prolonged drought | Pet-safe |
| Plantain-leaved Pussytoes | Bright indirect light (just back from a sunny window) | Low; drought-tolerant once established | Pet-safe |
| Plantain-Leaved Sedge | Low light (north window or shaded room) | Keep soil consistently moist; do not allow to dry out | Pet-safe |
| Plastic Plant Orchid | Bright indirect light (just back from a sunny window) | Every 4–7 days in growth; every 10–14 days in winter | Pet-safe |
| Playboy Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | Pet-safe |
| Pleasant Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn growth; none in summer | 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 |
| Plover Eggs | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (spring–autumn); once a month or less in winter | Pet-safe |
| Plumed cockscomb | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Plumed Palm | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; every 10–14 days in cooler months | Pet-safe |
| Plumose Shield Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Pohl's Air Plant | Bright indirect light (just back from a sunny window) | Soak for 20–30 minutes once per week, or mist thoroughly 2–3 times per week; reduce frequency in cool winter months. | Pet-safe |
| Point Reyes bearberry | Direct sun (at least 4-6 hours) | Low once established; water weekly for the first 1–2 seasons | Pet-safe |
| Pointed-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Pointed-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Poker alumroot | Bright indirect light (just back from a sunny window) | Every 7–14 days once established; more frequent when young | Pet-safe |
| Polka Dot 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 |
| Polynesian Davallia | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer, every 10–14 days in winter | Pet-safe |
| Polypody Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of medium is dry, roughly every 7-10 days | Pet-safe |
| Polystichum neolobatum | Low light (north window or shaded room) | Keep consistently moist; water every 5-7 days in dry conditions | Pet-safe |
| Polystichum setiferum 'Divisilobum' | Low light (north window or shaded room) | Keep evenly moist; water deeply during dry spells, roughly weekly in summer | Pet-safe |
| Ponytail palm | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 2-3 weeks | Pet-safe |
| Portugal quince | Direct sun (at least 4-6 hours) | Weekly in dry spells during the growing season; drought-tolerant once established | Pet-safe |
| Portuguese heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2 weeks in the first summer; drought-tolerant once established | Pet-safe |
| 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 |
| PowWow Wild Berry coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2 weeks once established in dry spells | Pet-safe |
| Prairie Azure Sage | Direct sun (at least 4-6 hours) | Fortnightly once established | Pet-safe |
| Prairie Blazing Star | Direct sun (at least 4-6 hours) | Moderate; weekly during establishment; drought-tolerant once established | Pet-safe |
| Prairie Coreopsis | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Prairie Dock | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | Pet-safe |
| Prairie Gentian | Direct sun (at least 4-6 hours) | Low — drought tolerant once established | Pet-safe |
| Prairie Goldenrod | Direct sun (at least 4-6 hours) | Low — water only to establish; drought-tolerant once rooted | Pet-safe |
| Prairie Heart-Leaved Aster | Direct sun (at least 4-6 hours) | Low to moderate — drought tolerant | Pet-safe |
| Prairie June Grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; withhold water during summer dormancy | Pet-safe |
| Prairie Penstemon | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly during establishment | Pet-safe |
| Prairie Sky Switchgrass | Direct sun (at least 4-6 hours) | Weekly during first season; every 2–3 weeks once established | Pet-safe |
| Prairie Violet | Bright indirect light (just back from a sunny window) | Fortnightly or less once established; drought-tolerant | Pet-safe |
| 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 |
| Prickly Crossandra | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; reduce to every 10–14 days in winter | Pet-safe |
| Prickly 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 |
| Prickly Pear Cactus | Direct sun (at least 4-6 hours) | Deeply but infrequently when soil is dry, every 2-4 weeks in the growing season; keep nearly dry in winter | Pet-safe |
| Prickly Shield Fern | Medium indirect light (a couple of metres from a window) | Weekly; drought-tolerant once established | Pet-safe |
| Pride of Rochester Deutzia | Direct sun (at least 4-6 hours) | Every 7-10 days during dry spells; drought-tolerant once established | Pet-safe |
| Prima Donna Magic Flower | Bright indirect light (just back from a sunny window) | Every 3–5 days during active growth; withhold entirely during dormancy | Pet-safe |
| Primrose-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 |
| 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 |
| Prism-fruit Prosthechea | Bright indirect light (just back from a sunny window) | When the top of the bark dries, roughly every 7-10 days in growth; every 10-14 days in winter | Pet-safe |
| Profusion orange zinnia | Direct sun (at least 4-6 hours) | Every 5–7 days once established; more frequently in pots or extreme heat | Pet-safe |
| 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 |
| Prosperity Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season, more in heat | Pet-safe |
| Prostrate Rosemary | Direct sun (at least 4-6 hours) | When the top few centimetres are dry, roughly every 7-10 days, less in cool spells | Pet-safe |
| Prostrate Speedwell | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Pet-safe |
| Psyllium | Direct sun (at least 4-6 hours) | Every 5-7 days; allow top 2-3 cm to dry between waterings | 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 |
| Pumila Dwarf Pampas Grass | Direct sun (at least 4-6 hours) | Weekly during establishment; afterwards only in drought | Pet-safe |
| Pumila Norway Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing; deep soak when the top 5 cm of soil dries | Pet-safe |
| Punting-Pole Bamboo | Direct sun (at least 4-6 hours) | Once or twice per week during growing season; less frequent in winter | Pet-safe |
| Purity cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; highly drought tolerant once established | Pet-safe |
| Purple Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist sparingly 1–2 times weekly | Pet-safe |
| Purple Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in warm weather | Pet-safe |
| Purple chokeberry | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Pet-safe |
| 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 Coneflower | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; about weekly while establishing, then only in drought | Pet-safe |
| Purple Fingers | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through early spring; none in summer | Pet-safe |
| Purple Garden Sage | Direct sun (at least 4-6 hours) | Low; allow soil to dry between waterings | Pet-safe |
| Purple Heartleaf Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days during active growth; minimal in winter | Pet-safe |
| Purple Love Grass | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent during the first growing season | Pet-safe |
| Purple Moor Grass | Bright indirect light (just back from a sunny window) | Regular; do not allow to dry out completely | Pet-safe |
| 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 Needlegrass | Direct sun (at least 4-6 hours) | Very low; summer-dry, winter-wet cycle | Pet-safe |
| Purple Passion Plant | Bright indirect light (just back from a sunny window) | Every 7 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Purple Poppy Mallow | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; deeply drought-tolerant | Pet-safe |
| Purple Prickly Pear | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and almost never in winter | Pet-safe |
| Purple Royal Fern | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist to wet; may need watering every 2-3 days in summer heat | Pet-safe |
| Purple Ruffles Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Purple Sage | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days once established | 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 |
| Purple Sweet Potato | Direct sun (at least 4-6 hours) | Moderate; about 25 mm (1 in) per week, less near harvest | Pet-safe |
| Purple Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more in active growth | Pet-safe |
| Purple Waffle Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil consistently moist | Pet-safe |
| Purple-leafed Clover | Direct sun (at least 4-6 hours) | Weekly during dry periods; tolerates brief dry spells once established | Pet-safe |
| Pussy Ears Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days; allow the top half of the soil to dry out between waterings | Pet-safe |
| Pygmy Bamboo | Bright indirect light (just back from a sunny window) | 2–3 times per week in growing season, once per week in winter | Pet-safe |
| Pygmy Cactus | Bright indirect light (just back from a sunny window) | When soil is dry, about every 7-10 days in growth; keep dry in winter | Pet-safe |
| Pygmy Date Palm | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth; reduce in winter | Pet-safe |
| Pyrenean Ramonda | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season; minimal in winter | Pet-safe |
| QIS Mix statice | Direct sun (at least 4-6 hours) | Every 7–10 days when actively growing; reduce in cool or wet weather | Pet-safe |
| Quedlinburg Lemon Balm | Bright indirect light (just back from a sunny window) | Every 4–6 days; allow top 2–3 cm to dry | Pet-safe |
| Queen Elizabeth Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly, when the top few centimetres of soil are dry | Pet-safe |
| Queen of Sweden Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | Pet-safe |
| Queen of the Night Cereus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer and every 4-6 weeks in winter | Pet-safe |
| Queen Pineapple | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil is dry, about every 7-10 days | Pet-safe |
| Queeny Lime Orange zinnia | Direct sun (at least 4-6 hours) | Every 3–5 days in warm weather; reduce in cool spells | Pet-safe |
| 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 |
| Quesnel's Bromeliad | Bright indirect light (just back from a sunny window) | Top up tank every 5–7 days; soil every 10–14 days | Pet-safe |
| Quila Bamboo | Medium indirect light (a couple of metres from a window) | Weekly to twice weekly during growing season; reduce in winter | Pet-safe |
| Rabbiteye Blueberry | Direct sun (at least 4-6 hours) | Moderate — 2–3 cm per week during establishment and fruiting | Pet-safe |
| Rabbiteye Blueberry | Direct sun (at least 4-6 hours) | Water deeply during establishment and fruiting; once settled it tolerates short dry spells better than highbush blueberries | Pet-safe |
| Raceme catmint | Direct sun (at least 4-6 hours) | Every 7–14 days; very drought-tolerant once established | Pet-safe |
| Racine's Vriesea | Bright indirect light (just back from a sunny window) | Refresh cup every 7–10 days; medium every 2 weeks | Pet-safe |
| Radicalis Palm | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 14–21 days in winter | Pet-safe |
| Rainbow Chard | Direct sun (at least 4-6 hours) | Every 3–5 days; more frequently in hot weather or containers | Pet-safe |
| Rainbow Chard | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days in summer | 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 |
| Rainforest Plum | Bright indirect light (just back from a sunny window) | Water 2–3 times per week in the growing season; once every 7–10 days in cooler months. | Pet-safe |
| Rattlesnake plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is just dry, roughly every 5-7 days in summer and every 10-14 days in winter | Pet-safe |
| Rattlesnake Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring/summer; every 10–14 days in autumn/winter | Pet-safe |
| Ravenea Glauca | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| 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 Banana | Direct sun (at least 4-6 hours) | Keep evenly moist; water when the top 2-3 cm of soil is dry, every 2-4 days in active growth | Pet-safe |
| Red Bee Balm | Bright indirect light (just back from a sunny window) | Every 1–2 weeks once established; more frequent during establishment | Pet-safe |
| Red Cabbage | Direct sun (at least 4-6 hours) | Water deeply and regularly; about weekly, more when hearting | Pet-safe |
| Red Creeping Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days once established; more frequent watering for new plantings | Pet-safe |
| Red Dragon Fruit | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; monthly in winter | Pet-safe |
| Red Feather Clover | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Red Fescue | Bright indirect light (just back from a sunny window) | Infrequent — drought-tolerant once established | Pet-safe |
| Red Fir | Direct sun (at least 4-6 hours) | Regular moisture; does not tolerate summer drought well | Pet-safe |
| Red Ginger | Bright indirect light (just back from a sunny window) | Every 3–5 days in the growing season; reduce in cooler months | Pet-safe |
| Red Groove Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| red head fountain grass | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; reduce in autumn; minimal in winter | Pet-safe |
| Red Huckleberry | Medium indirect light (a couple of metres from a window) | Moderate — keep moist but not waterlogged; water every 7–14 days in dry periods | Pet-safe |
| Red Inca Passionflower | Direct sun (at least 4-6 hours) | Every 3–5 days; keep consistently moist but not waterlogged | Pet-safe |
| Red Latan Palm | Direct sun (at least 4-6 hours) | Every 7–14 days; allow soil to partially dry between waterings | Pet-safe |
| Red Latan Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Red Margin Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during establishment; weekly once mature | Pet-safe |
| Red Mombin | Direct sun (at least 4-6 hours) | Every 10–21 days; drought-tolerant when established | Pet-safe |
| Red Mulberry | Direct sun (at least 4-6 hours) | Every 7-10 days when young; moderate drought tolerance once established | Pet-safe |
| Red Nerve Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil evenly moist | Pet-safe |
| Red Osier Dogwood | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | Pet-safe |
| Red Polka Dot Plant | Bright indirect light (just back from a sunny window) | Every 5–7 days; slightly less in winter | Pet-safe |
| Red Ray Switchgrass | Direct sun (at least 4-6 hours) | Every 1-2 weeks when established | Pet-safe |
| Red Sentinel Astilbe | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water every 3-5 days in summer, more in heat or containers | Pet-safe |
| Red Spruce | Direct sun (at least 4-6 hours) | Weekly in dry periods; naturally receives adequate moisture in humid northeastern climates | Pet-safe |
| Red Star Cluster | Direct sun (at least 4-6 hours) | Every 5–7 days; allow top 2–3 cm of soil to dry | Pet-safe |
| Red Stem Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Red Torch Cleistocactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Red Twig Dogwood 'Arctic Fire' | Direct sun (at least 4-6 hours) | Keep consistently moist; tolerates wet soil | Pet-safe |
| Red Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more frequent in first season | Pet-safe |
| Red Vygie | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is fully dry, roughly every 7-14 days in spring-summer; monthly or less in winter | Pet-safe |
| Red-bristled Dragon Orchid | Medium indirect light (a couple of metres from a window) | Every 2–3 days; roots must not dry out | Pet-safe |
| Red-fingered Vriesea | Bright indirect light (just back from a sunny window) | Refill cup every 7 days; flush every 3–4 weeks | Pet-safe |
| Red-fleshed Durian | Direct sun (at least 4-6 hours) | Daily watering in dry periods; 3–4 times per week when humidity is high | Pet-safe |
| Red-petal Lepanthes | Medium indirect light (a couple of metres from a window) | Daily misting or watering every 1-2 days; never allow to dry | Pet-safe |
| Red-Topped Sage | Direct sun (at least 4-6 hours) | Water when the top 3 cm of soil feels dry | Pet-safe |
| Reddish Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to dry out fully) | Pet-safe |
| Regal Staghorn Fern | Bright indirect light (just back from a sunny window) | When the shield fronds feel dry to the touch or the mounted board is very light, soak every 7-14 days | Pet-safe |
| Regel's Nidularium | Medium indirect light (a couple of metres from a window) | Weekly cup refill; medium barely moist | Pet-safe |
| Regel's Sage | Direct sun (at least 4-6 hours) | Moderate; approximately 2.5 cm (1 inch) per week | Pet-safe |
| Reichenbach's Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist 2–3 times weekly | Pet-safe |
| Reichenbach's Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in warm weather; every 2–3 days in cooler months | Pet-safe |
| Reinwardtii Haworthia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| 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 |
| Related Columnea | Medium indirect light (a couple of metres from a window) | When top 2–3 cm of mix dries | Pet-safe |
| Renny Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| 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 |
| Resurrection Gesneriad | Medium indirect light (a couple of metres from a window) | Once a week in the growing season; sparingly in winter | Pet-safe |
| Rhipsalis 'Cashero' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| Rhombus-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; every 3–4 weeks in winter | Pet-safe |
| Ribbon Bush | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; reduce to every 14 days in winter rest | Pet-safe |
| Riberry | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 10–14 days for mature plants in mild conditions | Pet-safe |
| Ribwort Plantain | Direct sun (at least 4-6 hours) | Every 7-14 days; very drought-tolerant once established | Pet-safe |
| Ric Rac Cactus | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of compost is dry, roughly every 7-10 days in summer | Pet-safe |
| Richard's Thyme | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Ridge Gourd | Direct sun (at least 4-6 hours) | Every 1–2 days in warm weather; deep, consistent moisture | Pet-safe |
| Ridley's Hohenbergia | Bright indirect light (just back from a sunny window) | Tank weekly; soil every 10–14 days | Pet-safe |
| Ridley's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Rigid Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; almost none in winter | Pet-safe |
| Rigid Goldenrod | Direct sun (at least 4-6 hours) | Low — drought tolerant once established | Pet-safe |
| 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 |
| Rise 'n' Shine Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, around every 2-4 days in summer | Pet-safe |
| river clog plant | Bright indirect light (just back from a sunny window) | Every 6–9 days in spring–summer, every 10–14 days in winter | Pet-safe |
| Robert Chapman heather | Direct sun (at least 4-6 hours) | Regular watering for the first season; drought-tolerant once established | Pet-safe |
| Robin Hill serviceberry | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Rochford Holly Fern | Low light (north window or shaded room) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Rochford's Holly Fern | Low light (north window or shaded room) | Every 7–10 days; less in winter | Pet-safe |
| Rock Candytuft | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Pet-safe |
| Rock Cress | Direct sun (at least 4-6 hours) | Low; water only when soil has dried out, roughly every 10–14 days in summer | Pet-safe |
| Rock 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 Palm | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 2-3 weeks in winter | Pet-safe |
| Rock Polypody | Medium indirect light (a couple of metres from a window) | Low to moderate — allow to dry slightly between waterings | Pet-safe |
| Rock Speedwell | Bright indirect light (just back from a sunny window) | Once every 7–10 days during the growing season; reduce markedly in winter. | Pet-safe |
| Rock Thyme | Direct sun (at least 4-6 hours) | Low — water only when the soil is completely dry | Pet-safe |
| Rocket candytuft | Direct sun (at least 4-6 hours) | Every 7–14 days; keep moist during establishment, reduce once rooted | Pet-safe |
| Rocket Mixed snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; maintain consistent soil moisture | Pet-safe |
| Rocky Mountain Douglas Fir | Direct sun (at least 4-6 hours) | Moderate during establishment; drought-tolerant once established | 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 |
| 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 |
| Rolfe's Masdevallia | Medium indirect light (a couple of metres from a window) | Every 1–2 days in summer; every 2–3 days in winter | Pet-safe |
| Roller Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; minimal in winter | Pet-safe |
| Rollers Houseleek | Direct sun (at least 4-6 hours) | Every 14-21 days in spring and summer; barely at all in winter | Pet-safe |
| Romaine Lettuce | Direct sun (at least 4-6 hours) | Every 2–4 days; more frequently in warm weather | Pet-safe |
| Roosevelt Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days in the growing season, less in winter | Pet-safe |
| Rose campion | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Rose of Sharon 'Blue Bird' | Direct sun (at least 4-6 hours) | Weekly while establishing, then during dry or hot spells | Pet-safe |
| Rose of Sharon 'Diana' | Direct sun (at least 4-6 hours) | Weekly to establish, then during dry and hot periods | Pet-safe |
| Rose Pincushion Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in spring and summer; little to none in winter | Pet-safe |
| Rose 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 |
| Rosebay Willowherb | Direct sun (at least 4-6 hours) | Minimal once established; tolerates both dry and wet soils | Pet-safe |
| Roselle | Direct sun (at least 4-6 hours) | Regularly; 2.5–5 cm (1–2 in) per week | Pet-safe |
| Rosemary | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Rosemary | Direct sun (at least 4-6 hours) | Every 7–14 days; allow soil to dry out significantly between waterings | Pet-safe |
| Roseraie de l'Hay Rose | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once settled | Pet-safe |
| Rosinweed | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| 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 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 |
| Rough Blazing Star | Direct sun (at least 4-6 hours) | Water to establish, then only during extended drought | Pet-safe |
| Rough Coelogyne | Bright indirect light (just back from a sunny window) | Every 3–5 days in active growth; reduce slightly in winter | Pet-safe |
| Rough Columnea | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; every 10–14 days in winter | Pet-safe |
| Rough Coneflower | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Rough Hawk's-beard | Direct sun (at least 4-6 hours) | Low — drought-tolerant, especially in the rosette year | Pet-safe |
| Rough Hawkbit | Direct sun (at least 4-6 hours) | Low — requires water only during prolonged summer drought | Pet-safe |
| Rough Marshmallow | Direct sun (at least 4-6 hours) | Minimal once established; water seedlings weekly until rooted | Pet-safe |
| Rough Pellionia | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; reduce to every 10–14 days in winter | Pet-safe |
| Round Melon | Direct sun (at least 4-6 hours) | Every 2–3 days; consistent moisture especially during fruiting | Pet-safe |
| Round-Leaf Calathea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growing season; every 10–14 days in winter | Pet-safe |
| Round-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow top 2–3 cm to dry) | Pet-safe |
| Round-leaf Rosularia | Direct sun (at least 4-6 hours) | Every 14–21 days during spring and summer; minimal in winter | Pet-safe |
| Roundhead Prairie Clover | Direct sun (at least 4-6 hours) | Once established, water deeply every 2–3 weeks in summer; no supplemental water needed once the taproot is mature | Pet-safe |
| Rowlee's Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 1–2 days in summer; every 2–4 days in cooler months | Pet-safe |
| Royal Blue Aubrieta | Direct sun (at least 4-6 hours) | Weekly in spring and autumn; infrequently in summer | Pet-safe |
| Royal medlar | Direct sun (at least 4-6 hours) | Regular during establishment; moderate once mature | Pet-safe |
| Royal Purple Lilyturf | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Royal Star Magnolia | Direct sun (at least 4-6 hours) | Weekly while young; in summer droughts for established shrubs | Pet-safe |
| Rubenza cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; drought tolerant once established | Pet-safe |
| Ruby Cascade Peperomia | Bright indirect light (just back from a sunny window) | Roughly every 10-14 days; let the top 2-3 cm dry out first | Pet-safe |
| Ruby Glow Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in spring/summer; every 4–6 weeks in winter | Pet-safe |
| Ruby Glow Peperomia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Rudbeckia 'Goldsturm' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days; very drought-tolerant once established | Pet-safe |
| Rudbeckia 'Pot of Gold' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Rudbeckia 'Prairie Sun' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Ruffled Echeveria | Bright indirect light (just back from a sunny window) | When the soil dries fully, roughly every 10-14 days in growth | Pet-safe |
| Rugosa Rose | Direct sun (at least 4-6 hours) | weekly when establishing, monthly once established | Pet-safe |
| Rumberry | Direct sun (at least 4-6 hours) | When the top 3–5 cm of soil is dry, roughly every 7–10 days; very drought-tolerant once mature | Pet-safe |
| Running serviceberry | Bright indirect light (just back from a sunny window) | Weekly during establishment; monthly or as needed once established | Pet-safe |
| Running Tapestry Foamflower | Medium indirect light (a couple of metres from a window) | Every 5–7 days; more during summer drought | Pet-safe |
| 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 |
| Russian Olive | Direct sun (at least 4-6 hours) | Low; highly drought-tolerant | Pet-safe |
| Rustica Rubra magnolia | Direct sun (at least 4-6 hours) | Regularly when young; moderate once established | Pet-safe |
| Rusty 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 |
| Sabal Bermudana | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Sabal Mexicana | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| 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 |
| Sage | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 7-14 days | Pet-safe |
| Salad Burnet | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Salal | Low light (north window or shaded room) | Moderate; established plants are drought-tolerant but prefer moist conditions | Pet-safe |
| Salmon Queen scabiosa | Direct sun (at least 4-6 hours) | Every 5–7 days in active growth; reduce in cool spells | Pet-safe |
| Salvia 'Hot Lips' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly while establishing, then infrequently | Pet-safe |
| Salvia 'May Night' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; roughly weekly, less once established | Pet-safe |
| Salvia × sylvestris 'Blauhügel' | Direct sun (at least 4-6 hours) | When top 3-5 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| Salvia nemorosa 'Ostfriesland' | Direct sun (at least 4-6 hours) | When top 3-5 cm of soil is dry, about every 7-10 days once established | Pet-safe |
| Salvia splendens 'Vista Red' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer heat | Pet-safe |
| Salvia verticillata 'Purple Rain' | Direct sun (at least 4-6 hours) | When top 3-5 cm of soil is dry, about every 7-10 days once established | Pet-safe |
| Samaipatensis Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer; sparing in winter | Pet-safe |
| San Diego Sage | Direct sun (at least 4-6 hours) | Low; drought tolerant once established | Pet-safe |
| San Gabriel Mountains Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks autumn through spring; none or minimal in summer | Pet-safe |
| San Jose Hesper Palm | Direct sun (at least 4-6 hours) | Every 2–3 weeks during growth; monthly or less when established | Pet-safe |
| San Jose Hesper Palm | Direct sun (at least 4-6 hours) | When the top 5-7 cm of soil is dry, roughly every 10-14 days in the growing season; every 3-4 weeks in winter | Pet-safe |
| Sand Bluestem | Direct sun (at least 4-6 hours) | Minimal — seasonal rainfall only in most settings | Pet-safe |
| 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 Lovegrass | Direct sun (at least 4-6 hours) | When the top 4-6 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Sand Phlox | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; drought-tolerant | Pet-safe |
| Sand Sedge | Direct sun (at least 4-6 hours) | Very infrequent — drought-adapted | Pet-safe |
| Sander's Maxillaria | Bright indirect light (just back from a sunny window) | Every 4–6 days year-round; never allow to fully dry out | Pet-safe |
| Sander's Vanda | Direct sun (at least 4-6 hours) | Daily in warmth; every 2-3 days when cool and dim | Pet-safe |
| Sandy Sulcorebutia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; very sparingly or not at all in winter | Pet-safe |
| Sanguine Coneflower | Direct sun (at least 4-6 hours) | Weekly during first season; every 3–4 weeks once established | Pet-safe |
| Sanguisorba 'Tanna' | Direct sun (at least 4-6 hours) | Keep soil moist but not waterlogged; water every 4-7 days in dry weather | Pet-safe |
| Sanguisorba officinalis | Direct sun (at least 4-6 hours) | Keep soil moist; water every 4-7 days in dry spells | Pet-safe |
| Santa Rita Prickly Pear | Direct sun (at least 4-6 hours) | Sparingly when soil is fully dry, about every 3-4 weeks in summer; nearly none in winter | Pet-safe |
| Sanvitalia procumbens 'Mandarin Orange' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer containers | Pet-safe |
| Sanvitalia procumbens 'Sunvy Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-4 days in summer containers | Pet-safe |
| Sapphire Tower | Direct sun (at least 4-6 hours) | every 7–10 days in the growing season, every 21–28 days in winter | Pet-safe |
| Sarcochilus ceciliae | Bright indirect light (just back from a sunny window) | Water every 2-4 days in growth, allowing the medium to approach dryness between waterings | Pet-safe |
| Sarcochilus falcatus | Bright indirect light (just back from a sunny window) | Water every 2-3 days, keeping the roots moist but well aired | Pet-safe |
| Sarcochilus hartmannii | Bright indirect light (just back from a sunny window) | Water every 2-4 days, keeping the medium damp but never waterlogged | Pet-safe |
| Saucer Magnolia | Direct sun (at least 4-6 hours) | Weekly while establishing, then during dry spells | Pet-safe |
| Saucer Magnolia | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 10–14 days once mature in dry spells | Pet-safe |
| Saunders' Billbergia | Medium indirect light (a couple of metres from a window) | Refill the central cup every 7-10 days; water the medium only when the top 3 cm is completely dry, roughly every 14-21 days | Pet-safe |
| Saunders' Vriesea | Bright indirect light (just back from a sunny window) | Keep cup filled; medium dry-down every 2–3 weeks | Pet-safe |
| Savory of Crete | Direct sun (at least 4-6 hours) | Every 10–14 days when established; every 5–7 days for seedlings or new transplants | Pet-safe |
| Savoy Cabbage | Direct sun (at least 4-6 hours) | Water deeply and regularly; about weekly, more while hearting | Pet-safe |
| Sawtooth Sunflower | Direct sun (at least 4-6 hours) | Weekly when young; every 1-2 weeks when established | Pet-safe |
| Scabiosa columbaria 'Butterfly Blue' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries; about weekly in the growing season | Pet-safe |
| Scabrosa Rugosa Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant afterwards | Pet-safe |
| Scaly Blazing Star | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought | Pet-safe |
| Scaly-stem Columnea | Bright indirect light (just back from a sunny window) | Every 5–8 days in summer, every 10–14 days in winter | Pet-safe |
| Scaly-Stemmed Holly Fern | Low light (north window or shaded room) | Every 5–8 days in growing season, every 10–14 days in winter | Pet-safe |
| Scarlet Ball Cactus | Direct sun (at least 4-6 hours) | When the mix is dry, about every 10-14 days in growth; sparingly in winter | Pet-safe |
| Scarlet Bidi-Bidi | Direct sun (at least 4-6 hours) | Fortnightly once established; drought-tolerant | Pet-safe |
| Scarlet Cleistocactus | Bright indirect light (just back from a sunny window) | When the soil is dry, about every 7-10 days in summer; sparing in winter | Pet-safe |
| Scarlet Drymonia | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter. | Pet-safe |
| Scarlet Emperor Runner Bean | Direct sun (at least 4-6 hours) | Every 5-7 days; more frequently during flowering and pod fill when soil is dry 3 cm down | Pet-safe |
| Scarlet Freesia | Direct sun (at least 4-6 hours) | Low to moderate during active growth; dry during summer dormancy | Pet-safe |
| Scarlet Giant Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days until established; every 14 days or less once established | Pet-safe |
| Scarlet Maxillaria | Bright indirect light (just back from a sunny window) | Every 2–3 days in growth, reduce slightly in winter | Pet-safe |
| Scarlet Star Bromeliad | Medium indirect light (a couple of metres from a window) | Fill the central urn weekly; water the potting mix every 2–3 weeks, allowing it to approach dryness between applications | Pet-safe |
| 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 |
| Schiede's goldfish plant | Medium indirect light (a couple of metres from a window) | Water when the top 2 cm of soil dries out — approximately every 7–10 days in summer, every 10–14 days in winter. | Pet-safe |
| Schlumbergera 'White Christmas' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Scrub Palmetto | Direct sun (at least 4-6 hours) | Rarely after establishment — every 3–6 weeks in extended dry spells | Pet-safe |
| Scurfy Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; once every 2–3 weeks during summer dry rest | Pet-safe |
| Sea Beet | Direct sun (at least 4-6 hours) | Water sparingly once established; roughly every 10-14 days in summer | Pet-safe |
| Sea Campion | Direct sun (at least 4-6 hours) | Every 1–2 weeks; drought-tolerant once established | 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 Rocket | Direct sun (at least 4-6 hours) | Sparingly — drought-tolerant once established | Pet-safe |
| Sea Sandwort | Direct sun (at least 4-6 hours) | Infrequently — allow soil to dry between waterings | Pet-safe |
| 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 |
| Seabeach Sandwort | Direct sun (at least 4-6 hours) | Infrequently — highly drought-tolerant once established | Pet-safe |
| Seascape Strawberry | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 2-4 days; daily for baskets in heat | Pet-safe |
| Seascape Strawberry | Direct sun (at least 4-6 hours) | Every 1–2 days in warm, dry weather; every 3–5 days in cool or coastal conditions | Pet-safe |
| Sedum | Direct sun (at least 4-6 hours) | When the soil is dry, every 10-14 days for potted plants | Pet-safe |
| Sedum 'Autumn Joy' | Direct sun (at least 4-6 hours) | When soil is dry several centimeters down, roughly every 10-14 days | Pet-safe |
| Sedum 'Matrona' | Direct sun (at least 4-6 hours) | When soil is dry a few centimeters down, roughly every 10-14 days | Pet-safe |
| Sedum clavatum | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer | Pet-safe |
| Sedum hernandezii | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, very sparingly in winter | Pet-safe |
| Sedum palmeri | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Sedum spectabile 'Iceberg' | Direct sun (at least 4-6 hours) | When soil is dry a few centimeters down, about every 10-14 days | Pet-safe |
| Sedum telephium 'Purple Emperor' | Direct sun (at least 4-6 hours) | When soil is dry a few centimeters down, about every 10-14 days | Pet-safe |
| Sekete's Restrepia | Bright indirect light (just back from a sunny window) | Every 2-4 days; keep evenly moist | Pet-safe |
| Selfheal | Medium indirect light (a couple of metres from a window) | Once to twice weekly; keep soil consistently 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 |
| Senegal Date Palm | Direct sun (at least 4-6 hours) | Water deeply every 7-14 days in active growth; more drought-tolerant once established | Pet-safe |
| Senita Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Pet-safe |
| Sensation Mix Cosmos | Direct sun (at least 4-6 hours) | When the top 3–5 cm of soil is dry, roughly every 7–10 days once established | Pet-safe |
| Sensation Mixed cosmos | Direct sun (at least 4-6 hours) | Once or twice weekly until established; then only during prolonged dry spells | Pet-safe |
| Sensation Mixed cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; very drought tolerant once established | Pet-safe |
| Seravshan Hyssop | Direct sun (at least 4-6 hours) | Every 10–14 days once established; more frequent when newly planted | Pet-safe |
| Sessile Elatostema | Low light (north window or shaded room) | Every 3–5 days; substrate should remain consistently moist | Pet-safe |
| Sessile-Leaf Tick Trefoil | Bright indirect light (just back from a sunny window) | Water every 10–14 days during establishment; once established it is drought-tolerant in typical dry woodland and upland conditions | Pet-safe |
| 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 |
| Shadow Adromischus | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks in the active season; monthly in winter | Pet-safe |
| Shagbark Hickory | Direct sun (at least 4-6 hours) | Water young trees weekly in dry spells; mature trees are drought-tolerant | Pet-safe |
| Shagbark manzanita | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; more frequent during the first 2 years | Pet-safe |
| Shaggy 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 |
| Shaggy Wood Fern | Medium indirect light (a couple of metres from a window) | Regular; keep moist but not waterlogged | 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 |
| Sharp-fruited Abutilon | Direct sun (at least 4-6 hours) | Every 7–10 days when young; fortnightly once established | Pet-safe |
| Sharp-Lobed Shield Fern | Medium indirect light (a couple of metres from a window) | Every 7–10 days; reduce in winter | Pet-safe |
| Sharp-tipped Lepanthes | Medium indirect light (a couple of metres from a window) | Daily or every 2 days; keep roots consistently moist | Pet-safe |
| sheep'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 |
| Sheep's Fescue | Direct sun (at least 4-6 hours) | Established plants are very drought-tolerant; water only during severe prolonged drought, roughly every 14-21 days in dry conditions | Pet-safe |
| Shenandoah Switchgrass | Direct sun (at least 4-6 hours) | Weekly during establishment (first season); monthly or as needed once established | Pet-safe |
| Shield Sundew | Direct sun (at least 4-6 hours) | Tray-water during active growth (autumn–spring); completely dry in summer. | Pet-safe |
| Shingle Plant Hoya | Bright indirect light (just back from a sunny window) | When the mix is almost completely dry, roughly every 10-14 days in summer | Pet-safe |
| Shining Bush Peperomia | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; every 10–14 days in winter | Pet-safe |
| 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 Nidularium | Medium indirect light (a couple of metres from a window) | Refill central cup weekly; substrate every 10–14 days | Pet-safe |
| Shining Thyme | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Shinseiki Asian pear | Direct sun (at least 4-6 hours) | Weekly during the growing season, reduced in winter dormancy | Pet-safe |
| Shiny Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Pet-safe |
| Shoestring Fern | Low light (north window or shaded room) | Keep the mount or medium consistently moist; mist or water every 2-4 days | Pet-safe |
| Shooting Star Hoya | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-9 days in growth | Pet-safe |
| Short-Frond Lady Fern | Low light (north window or shaded room) | Every 2–3 days; keep consistently moist | Pet-safe |
| Short-leaved Deuterocohnia | Direct sun (at least 4-6 hours) | Every 2 weeks in summer; monthly or less in winter | Pet-safe |
| 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 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 Border Forsythia | Direct sun (at least 4-6 hours) | Every 7-14 days during dry spells; very drought-tolerant once established | Pet-safe |
| Showy Corytoplectus | Bright indirect light (just back from a sunny window) | Every 5–7 days in the growing season; reduce to every 10–14 days in winter. | Pet-safe |
| Showy Cranesbill | Bright indirect light (just back from a sunny window) | Weekly during spring and summer; minimal in autumn and winter | Pet-safe |
| Showy Goldenrod | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water in extended dry spells only | Pet-safe |
| Showy Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; once every 2–4 weeks during dry rest | Pet-safe |
| Showy Tick Trefoil | Direct sun (at least 4-6 hours) | Water weekly to every 10 days during dry spells in the first season; once established, tolerates moderate drought but prefers consistently moist soil | Pet-safe |
| Shrimp Plant | Bright indirect light (just back from a sunny window) | When the top 2–3 cm (1 in) of compost dries out | 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 |
| Shrubby Indian Mallow | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; monthly or as needed in winter | Pet-safe |
| Siberian Bugloss 'Hadspen Cream' | Medium indirect light (a couple of metres from a window) | Every 5-7 days during the growing season; reduce in winter | Pet-safe |
| Siberian Fir | Direct sun (at least 4-6 hours) | Moderate; relies on snowmelt and seasonal rain | Pet-safe |
| Siberian Ginseng | Medium indirect light (a couple of metres from a window) | Every 7–14 days; moderate moisture | Pet-safe |
| Siberian Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; low once established | Pet-safe |
| Siberian Pine | Direct sun (at least 4-6 hours) | Keep young trees moist; water established trees in extended drought only | Pet-safe |
| Siebold's Magnolia | Bright indirect light (just back from a sunny window) | Weekly throughout the growing season; reduce in winter | Pet-safe |
| Siebold's Wood Fern | Medium indirect light (a couple of metres from a window) | Moderate; allow slight drying between waterings once established | Pet-safe |
| Sierra 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 |
| Sikkim Larch | Direct sun (at least 4-6 hours) | Weekly during establishment, less once established | Pet-safe |
| Silkworm Mulberry | Direct sun (at least 4-6 hours) | Weekly during establishment; every 10–14 days once established | Pet-safe |
| Silky Aster | Direct sun (at least 4-6 hours) | Low — drought tolerant | Pet-safe |
| Silky Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 10–14 days in growth; very sparingly in winter | Pet-safe |
| silky thread grass | Direct sun (at least 4-6 hours) | Once established, water only during extended drought; every 2–3 weeks in hot, dry summers | Pet-safe |
| 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 Brake Fern | Medium indirect light (a couple of metres from a window) | Twice weekly in summer; weekly in winter | Pet-safe |
| Silver Cluster Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in growth; withhold in winter | Pet-safe |
| Silver Cup Annual Mallow | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Silver Date Palm | Direct sun (at least 4-6 hours) | Every 7–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Silver Date Palm | Direct sun (at least 4-6 hours) | Water deeply every 10-14 days in dry periods; largely self-sufficient once established in the ground | Pet-safe |
| Silver Dragon Lilyturf | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Pet-safe |
| Silver European Fan Palm | Direct sun (at least 4-6 hours) | Water every 14-21 days in dry periods; very drought-tolerant once established in the ground | Pet-safe |
| Silver Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once established | Pet-safe |
| Silver Goldfish Plant | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of mix feels dry; approximately every 7 days in summer, every 10–14 days in winter | Pet-safe |
| Silver Knight heather | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate watering once established | Pet-safe |
| Silver lace fern | Bright indirect light (just back from a sunny window) | Keep evenly moist — water as soon as the surface feels barely dry, often every 3-5 days | Pet-safe |
| Silver Light Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in the growing season; reduce in autumn and winter | Pet-safe |
| Silver Mediterranean Fan Palm | Direct sun (at least 4-6 hours) | Moderate; allow top 3–5 cm to dry between waterings | Pet-safe |
| Silver Posie Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days; allow soil to dry between waterings | Pet-safe |
| Silver Queen Thyme | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; roughly every 7-12 days, less in cool spells | Pet-safe |
| Silver Sage | Direct sun (at least 4-6 hours) | Fortnightly or when soil is dry | Pet-safe |
| silver spike grass | Direct sun (at least 4-6 hours) | Weekly in the first season; monthly deep watering once established | Pet-safe |
| Silver Staghorn Fern | Direct sun (at least 4-6 hours) | When the mount is thoroughly dry, soak every 10-21 days; allows longer dry periods than most staghorns | Pet-safe |
| Silver Thyme | Direct sun (at least 4-6 hours) | When the soil is dry several centimetres down, roughly every 7-14 days; far less in winter | Pet-safe |
| Silver Torch Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer; keep dry in winter | Pet-safe |
| Silver Vine | Direct sun (at least 4-6 hours) | Weekly, or when the top few centimetres of soil dry | Pet-safe |
| Silver-leaf Sinningia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; water very sparingly or not at all during dormancy | Pet-safe |
| Silverberry | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Silverleaf Peperomia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Silvery Stelis | Medium indirect light (a couple of metres from a window) | Every 1–2 days; keep medium consistently moist | Pet-safe |
| Simon Bamboo | Direct sun (at least 4-6 hours) | 2–3 times per week in summer, once per week in winter | Pet-safe |
| 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 |
| sioux blue indian grass | Direct sun (at least 4-6 hours) | Regularly during first season; once established, water only during prolonged summer drought | Pet-safe |
| Sitka Spruce | Direct sun (at least 4-6 hours) | Regular — keep soil consistently moist; very high natural rainfall in native habitat | Pet-safe |
| Skinner's Barkeria | Bright indirect light (just back from a sunny window) | Abundantly every 4-7 days during summer growth; nearly dry rest from late autumn to early spring | Pet-safe |
| Skinner's Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce to every 10–14 days in winter | Pet-safe |
| Sky Blue Aster | Direct sun (at least 4-6 hours) | Water to establish, then rarely; very drought-tolerant | Pet-safe |
| Sky Rocket Feather Top | Direct sun (at least 4-6 hours) | Weekly while establishing, then occasional deep watering in drought | Pet-safe |
| Sleeping Beauty Cymbidium | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce to every 10–14 days in autumn–winter | Pet-safe |
| Slender 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 Maidenhair Fern | Medium indirect light (a couple of metres from a window) | Every 2–4 days in active growth; every 4–6 days in winter | Pet-safe |
| Slender-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 |
| Slow-bolt Cilantro | Bright indirect light (just back from a sunny window) | Every 2–3 days, or when the top inch of soil feels dry | Pet-safe |
| Small-flowered alumroot | Medium indirect light (a couple of metres from a window) | Weekly during the growing season; do not allow to dry out completely | Pet-safe |
| Small-Flowered Cranesbill | Bright indirect light (just back from a sunny window) | Low; water sparingly and only in drought | Pet-safe |
| Small-Fruited Ptychosperma | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Small-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–5 weeks in winter | Pet-safe |
| Small-Leaved Lipstick Vine | Bright indirect light (just back from a sunny window) | Water when the top 2 cm of mix has dried; roughly every 7–10 days in summer, every 12–14 days in winter | Pet-safe |
| Small's Beardtongue | Bright indirect light (just back from a sunny window) | Every 1–2 weeks; reduce in winter | Pet-safe |
| Smoky saskatoon | Direct sun (at least 4-6 hours) | Weekly during dry spells; moderate once established | Pet-safe |
| Smooth Beardtongue | Bright indirect light (just back from a sunny window) | Weekly to every 10 days; adapts to both drought and periodic wet | Pet-safe |
| Smooth Blue Aster | Direct sun (at least 4-6 hours) | Water weekly until established, then sparingly | Pet-safe |
| Smooth Coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Smooth Oxeye | Direct sun (at least 4-6 hours) | Every 1-2 weeks | Pet-safe |
| Smooth Phlox | Bright indirect light (just back from a sunny window) | 2–3 times per week in summer; weekly when established | Pet-safe |
| 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 Pea | Direct sun (at least 4-6 hours) | Every 2–3 days during active growth; more in dry or warm spells | Pet-safe |
| Snow-in-Summer | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Pet-safe |
| Snowball Pincushion | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep dry through winter | Pet-safe |
| Snowcap Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Snowy mespilus | Bright indirect light (just back from a sunny window) | Weekly during first season; every 2–3 weeks once established | Pet-safe |
| Snowy Wood Rush | Bright indirect light (just back from a sunny window) | Moderate; water every 7–10 days in dry periods, more frequently in summer heat | Pet-safe |
| Sobralia macrantha | Bright indirect light (just back from a sunny window) | Water generously in active growth, keeping evenly moist; ease off in winter | Pet-safe |
| Soft Shield Fern | Low light (north window or shaded room) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Soidao Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in growth; reduce to every 3–4 weeks in cooler months | Pet-safe |
| Sonoran Palmetto | Direct sun (at least 4-6 hours) | When the top 5-6 cm of soil is dry, roughly every 14-21 days in summer | Pet-safe |
| 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 |
| Southern Japanese Hemlock | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduced in winter | Pet-safe |
| Southern Magnolia | Direct sun (at least 4-6 hours) | Deeply once a week for the first two seasons; established trees need water only in drought | Pet-safe |
| Southern Magnolia 'Little Gem' | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 1-2 weeks in dry weather | Pet-safe |
| Southern Maidenhair Fern | Bright indirect light (just back from a sunny window) | Frequent — keep soil consistently moist | Pet-safe |
| Spaghetti Squash | Direct sun (at least 4-6 hours) | Every 2–3 days | Pet-safe |
| Spanish Draba | Direct sun (at least 4-6 hours) | Water sparingly; allow soil to dry between waterings | Pet-safe |
| Spanish Fir | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; minimal once mature | Pet-safe |
| Spanish heath | Direct sun (at least 4-6 hours) | Weekly during establishment; fortnightly in summer once established | Pet-safe |
| Spanish Houseleek | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month in winter | Pet-safe |
| Spanish Marjoram | Direct sun (at least 4-6 hours) | Every 10–14 days (growing season); every 3–4 weeks (dormancy) | Pet-safe |
| Spanish Stonecrop | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in very dry spells | Pet-safe |
| Spanish Wood Thyme | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Sparkler Palm Sedge | Medium indirect light (a couple of metres from a window) | Every 5-7 days or when the top 2 cm of soil is dry | Pet-safe |
| Spartan Blueberry | Direct sun (at least 4-6 hours) | Keep consistently moist but never waterlogged, roughly 25-40 mm weekly, more during fruiting | Pet-safe |
| Spathoglottis plicata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix begins to dry, roughly every 3-5 days in warmth | Pet-safe |
| Spectacular Dendrobium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth; reduce to once every 2-3 weeks during 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 |
| Spike Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season; sparingly in winter (once a month or less) | Pet-safe |
| Spike heath | Direct sun (at least 4-6 hours) | Low to moderate — once established, water only during prolonged drought | Pet-safe |
| Spike Moss | Medium indirect light (a couple of metres from a window) | Keep evenly moist at all times; typically water every 2-4 days so the soil never dries out | Pet-safe |
| 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 |
| spiked sedge | Bright indirect light (just back from a sunny window) | Moderate; water weekly in dry spells once established | Pet-safe |
| Spiked speedwell | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Pet-safe |
| Spiny Billbergia | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Spiny Club Cactus | Direct sun (at least 4-6 hours) | When soil is dry, about every 10-14 days in summer; little to none in winter | Pet-safe |
| Spiny Fuchsia | Direct sun (at least 4-6 hours) | Infrequent — allow soil to dry between waterings | Pet-safe |
| Spiny Orostachys | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; almost none in winter dormancy | 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 |
| Spiny Tree Fern | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days | Pet-safe |
| 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 |
| Spiraea 'Shirobana' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| 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 |
| Splitbeard Bluestem | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days | 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 |
| Spotted Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 5–7 days in active growth; reduce to every 10–14 days in cool or dormant periods | Pet-safe |
| Spotted Gasteria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Spotted Joe Pye Weed | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water weekly or more in dry spells | Pet-safe |
| 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 Spike Moss | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; check every 2-3 days | Pet-safe |
| Spreading-Flower Guzmania | Bright indirect light (just back from a sunny window) | Top up cup every 5–10 days; water medium every 2 weeks | Pet-safe |
| Spring Beauty | Medium indirect light (a couple of metres from a window) | Moderate during active growth (February–May); none needed during summer dormancy. | Pet-safe |
| Spring Cinquefoil | Direct sun (at least 4-6 hours) | Rarely once established; drought-tolerant | Pet-safe |
| Spring Cinquefoil (Potentilla tabernaemontani) | Direct sun (at least 4-6 hours) | Rarely; drought-tolerant once established | Pet-safe |
| Spring 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 |
| Springwood White winter heath | Direct sun (at least 4-6 hours) | Weekly for new plantings; established plants tolerate dry spells with watering every 2–3 weeks | Pet-safe |
| Spurred Vanhouttea | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow top 2 cm to dry slightly between waterings | Pet-safe |
| Square Leaf Hoya | Bright indirect light (just back from a sunny window) | When the top third of the mix dries out (roughly weekly in summer, every 2 weeks in winter) | Pet-safe |
| Squirrel's Paw Fern | Bright indirect light (just back from a sunny window) | Every 5–8 days in the growing season, every 10–14 days in cooler months | Pet-safe |
| St Dabeoc's heath | Direct sun (at least 4-6 hours) | Moderate; water regularly to keep soil evenly moist, especially in the first year | Pet-safe |
| Staghorn fern | Bright indirect light (just back from a sunny window) | Soak the mount weekly in summer, every 2-3 weeks in winter | Pet-safe |
| Stanhopea oculata | Bright indirect light (just back from a sunny window) | When the basket surface begins to dry, often every 2-4 days in growth | Pet-safe |
| Stanhopea tigrina | Bright indirect light (just back from a sunny window) | Every 2-4 days in warm active growth; weekly in cooler, shorter days | Pet-safe |
| Stanhopea wardii | Bright indirect light (just back from a sunny window) | When the basket surface starts to dry, roughly every 2-4 days in active growth | Pet-safe |
| Stapelia flavopurpurea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Pet-safe |
| Stapelia grandiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia hirsuta | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia leendertziae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Pet-safe |
| Stapelia variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Star Cactus | Direct sun (at least 4-6 hours) | Every 2-4 weeks in spring/summer; roughly monthly or less in winter | Pet-safe |
| Star 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 Jasmine | Bright indirect light (just back from a sunny window) | Water regularly to establish; once mature, water during dry spells when the top few cm of soil dries | Pet-safe |
| Star Magnolia | Direct sun (at least 4-6 hours) | Keep moist while establishing; water deeply weekly in dry spells for the first few years | Pet-safe |
| Star Magnolia 'Royal Star' | Direct sun (at least 4-6 hours) | Weekly while young, then in dry periods | Pet-safe |
| Star 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 |
| Stardust Dendrobium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in winter rest | Pet-safe |
| Starflower | Medium indirect light (a couple of metres from a window) | Regular; keep soil consistently moist throughout the growing season (spring through autumn). | Pet-safe |
| Starflower pincushion | Direct sun (at least 4-6 hours) | Every 6–8 days during active growth | Pet-safe |
| Starina Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Statice | Direct sun (at least 4-6 hours) | Low to moderate — allow soil to dry between waterings | Pet-safe |
| Statice sea lavender | Direct sun (at least 4-6 hours) | Once weekly; allow the top 2–3 cm of soil to dry between waterings | Pet-safe |
| Stenocactus crispatus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; keep dry in winter | Pet-safe |
| Stephan's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late August through November (active growth); withheld completely from May to late August | Pet-safe |
| Sterling Silver Linden | Direct sun (at least 4-6 hours) | Weekly during the first 2 years; monthly deep watering once established | Pet-safe |
| Stern's medlar | Bright indirect light (just back from a sunny window) | Moderate; keep soil evenly moist | Pet-safe |
| Stewartia monadelpha | Bright indirect light (just back from a sunny window) | Weekly; keep soil consistently moist but well-drained | Pet-safe |
| Stewartia pseudocamellia | Bright indirect light (just back from a sunny window) | Weekly; keep soil consistently moist but never waterlogged | Pet-safe |
| Stiff Goldenrod | Direct sun (at least 4-6 hours) | Highly drought-tolerant; water only in prolonged drought | Pet-safe |
| Stiff Sunflower | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Stiff twinspur | Direct sun (at least 4-6 hours) | 2–3 times per week in active growth; once per week when established in cooler weather | Pet-safe |
| Stiff-leaved Aponogeton | Medium indirect light (a couple of metres from a window) | Permanently submerged; fortnightly 25% water changes as a minimum | Pet-safe |
| Stolonifera Palm | Low light (north window or shaded room) | Every 10–14 days in summer, every 2–3 weeks in winter | Pet-safe |
| Stone Gate Palm | Direct sun (at least 4-6 hours) | Weekly in summer, fortnightly in winter | Pet-safe |
| Stone Pine | Direct sun (at least 4-6 hours) | Water young trees during dry spells; established trees rarely need irrigation | Pet-safe |
| Stonecrop 'Autumn Joy' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days; less frequent once established | Pet-safe |
| Stonecrop 'Dragon's Blood' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days; minimal once established | Pet-safe |
| 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 |
| Strachey's Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–10 days during the growing season; reduce in winter | Pet-safe |
| Strap-leaf Pleurothallis | Medium indirect light (a couple of metres from a window) | Every 2–3 days in active growth; reduce slightly during winter dormancy | Pet-safe |
| Straw-red Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established; weekly for new plants | Pet-safe |
| Strawberry Begonia | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about every 5-7 days | Pet-safe |
| Strawberry 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 |
| Strawberry Fields gomphrena | Direct sun (at least 4-6 hours) | Weekly; drought-tolerant once established | Pet-safe |
| Strawberry globe amaranth | Direct sun (at least 4-6 hours) | Every 7–14 days once established; moderate during establishment | Pet-safe |
| Streptocarpus saxorum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-12 days | Pet-safe |
| Stricta Feather Reed Grass | Direct sun (at least 4-6 hours) | Consistently moist; tolerates standing water in spring | Pet-safe |
| String Bean Hoya | Bright indirect light (just back from a sunny window) | When the soil is almost fully dry, roughly every 10-14 days | Pet-safe |
| String of hearts | Bright indirect light (just back from a sunny window) | When soil is dry, every 10-14 days | Pet-safe |
| String of Hearts 'Silver Glory' | Bright indirect light (just back from a sunny window) | When the top half of the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| String of Spades | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days | Pet-safe |
| String of Turtles | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 10–14 days in winter | Pet-safe |
| Stripe It Rich Hakone Grass | 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 |
| Striped Goldfish Plant | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry | Pet-safe |
| stromanthe | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Stromanthe Sanguinea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is just dry, roughly every 5-7 days in growth | Pet-safe |
| Subalpine Fir | Direct sun (at least 4-6 hours) | Regular watering during establishment; naturally sustained by snowmelt and high-altitude precipitation | Pet-safe |
| Subalpine Larch | Direct sun (at least 4-6 hours) | Moderate; supplemental irrigation during dry summers | Pet-safe |
| Sugar Palm | Bright indirect light (just back from a sunny window) | When the top 4-6 cm of soil is dry, roughly every 7-10 days in summer; every 14-21 days in winter | Pet-safe |
| Sugar Snap Pea | Direct sun (at least 4-6 hours) | Weekly, increasing once flowering and podding start | Pet-safe |
| Sulawesi Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Sulcorebutia steinbachii | Direct sun (at least 4-6 hours) | When fully dry in summer, roughly every 10-14 days; none in winter | Pet-safe |
| Sulphur Clover | Bright indirect light (just back from a sunny window) | Low to moderate; drought-tolerant once established | Pet-safe |
| Sulphur Cosmos | Direct sun (at least 4-6 hours) | Water until established, then only in extended drought; highly drought-tolerant | Pet-safe |
| Summer Hyacinth | Direct sun (at least 4-6 hours) | Regular during spring and summer; reduce in autumn and winter | Pet-safe |
| Summer savory | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Summer Savory Cuban | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days | Pet-safe |
| Summer Wave Amethyst Wishbone Flower | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| Summit Sage | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| 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 |
| Sunblaze Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 2-4 days in summer | Pet-safe |
| Sunningdale Silver Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; thereafter only in extended drought | Pet-safe |
| Sunrise Crown Cactus | Direct sun (at least 4-6 hours) | When fully dry, roughly every 12-16 days in growth; none in winter | Pet-safe |
| 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 |
| Sunset Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days once established | Pet-safe |
| Sunshine Blue Blueberry | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 2-4 days in warm weather | Pet-safe |
| Super Kabuto Star Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth; none in winter | Pet-safe |
| Super King Ixora Red | Direct sun (at least 4-6 hours) | Every 5–7 days; maintain consistent moisture without waterlogging | 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 |
| Supertunia bubblegum petunia | Direct sun (at least 4-6 hours) | Every 2–4 days in containers in heat; every 5–7 days in borders | Pet-safe |
| 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 |
| Swamp Rose Mallow | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in summer or more frequently in containers | Pet-safe |
| Sweet alyssum | Bright indirect light (just back from a sunny window) | Every 5–7 days; drought-tolerant once established | Pet-safe |
| Sweet Birch | Direct sun (at least 4-6 hours) | Moderate; water deeply during drought; established trees on suitable sites are largely self-sufficient | Pet-safe |
| Sweet Black-Eyed Susan | Direct sun (at least 4-6 hours) | Weekly in the first growing season; every 10–14 days when established | Pet-safe |
| Sweet Chestnut | Direct sun (at least 4-6 hours) | Water deeply every 7-14 days while establishing and in summer drought; mature trees are largely self-sufficient | Pet-safe |
| Sweet Chestnut 'Marigoule' | Direct sun (at least 4-6 hours) | Water deeply every 7-14 days for the first few seasons and during summer drought while nuts fill | Pet-safe |
| Sweet marjoram | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Sweet sultan | Direct sun (at least 4-6 hours) | Every 7–10 days | 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 |
| Sweetbay Magnolia | Direct sun (at least 4-6 hours) | Keep soil consistently moist; weekly deep watering when young and during dry spells | Pet-safe |
| Sweetbriar Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then minimal | Pet-safe |
| Sweetcorn | Direct sun (at least 4-6 hours) | Deeply 2-3 times a week, more in heat; never let soil dry out at tasselling and cob fill | 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 |
| Swiss Chard | Direct sun (at least 4-6 hours) | Every 3–5 days; more in summer heat | Pet-safe |
| Swiss Chard 'Fordhook Giant' | Direct sun (at least 4-6 hours) | Water regularly, about 25 mm per week, keeping the soil evenly moist | Pet-safe |
| Swiss Chard 'Yellow Ribbon' | Direct sun (at least 4-6 hours) | Water regularly, roughly 25 mm per week, keeping soil consistently moist | Pet-safe |
| Sword-Leaved Phlox | Direct sun (at least 4-6 hours) | Weekly until established; monthly or less once established in well-drained soil | Pet-safe |
| Syagrus Romanzoffiana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-10 days in heat | Pet-safe |
| Sylvester Date Palm | Direct sun (at least 4-6 hours) | Deeply every 7-14 days while establishing, then drought-tolerant | Pet-safe |
| Symphyotrichum laeve 'Bluebird' | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged dry spells once settled | Pet-safe |
| Symphyotrichum novi-belgii 'Fellowship' | Direct sun (at least 4-6 hours) | Keep soil reliably moist; water deeply, around weekly, never letting roots dry | Pet-safe |
| Symphyotrichum oblongifolium 'Raydon's Favorite' | Direct sun (at least 4-6 hours) | Weekly during the first season; once established, only in prolonged drought | Pet-safe |
| Table Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is just barely dry, roughly every 4-7 days | Pet-safe |
| Tailed Aechmea | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); refresh central tank monthly | Pet-safe |
| Tailed Brake Fern | Medium indirect light (a couple of metres from a window) | Every 3–5 days in the growing season; every 7 days in winter | Pet-safe |
| Taiwan Felt Fern | Bright indirect light (just back from a sunny window) | Every 7-10 days; allow surface to dry between waterings | Pet-safe |
| Tall Bluebells | Bright indirect light (just back from a sunny window) | Water deeply 2–3 times weekly; never allow to dry out in growing season | Pet-safe |
| Tall Coreopsis | Direct sun (at least 4-6 hours) | Low once established; water weekly during the first growing season | Pet-safe |
| Tall Goldenrod | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water only in extended dry spells | Pet-safe |
| Tall Moor Grass | Bright indirect light (just back from a sunny window) | Regular; keep soil evenly moist | Pet-safe |
| tall purple moor grass | Bright indirect light (just back from a sunny window) | Regularly during establishment; once established, water only in prolonged dry spells | Pet-safe |
| Tamarack | Direct sun (at least 4-6 hours) | Regular; tolerates seasonally wet or boggy conditions | Pet-safe |
| Tar-scented Vriesea | Bright indirect light (just back from a sunny window) | Refill central cup weekly; allow potting medium to remain almost completely dry | Pet-safe |
| Taraw Palm | Direct sun (at least 4-6 hours) | Regularly during establishment; moderately once mature | Pet-safe |
| Tasmanian Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about every 5-7 days | Pet-safe |
| Tatting Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; reduce in winter | Pet-safe |
| Tawny Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water sparingly in autumn (September–November) during active growth; keep completely dry in winter and summer | Pet-safe |
| Teague's Porroglossum | Medium indirect light (a couple of metres from a window) | Every 2–4 days; allow medium surface to dry slightly between waterings | Pet-safe |
| Teddy Bear Palm | Direct sun (at least 4-6 hours) | Every 3–5 days when established in ground; check containers daily in summer | Pet-safe |
| Teddy Bear Palm | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil dries out, roughly every 7-14 days depending on conditions | Pet-safe |
| Teddy Bear sunflower | Direct sun (at least 4-6 hours) | Weekly, or every 5–7 days during dry spells | Pet-safe |
| Teddy Bear Vine | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil feel dry, roughly every 7–10 days year-round | Pet-safe |
| teff grass | Direct sun (at least 4-6 hours) | Moderate; water every 7–10 days in dry conditions once germinated, reducing toward harvest | Pet-safe |
| Tennessee Coneflower | Direct sun (at least 4-6 hours) | Water to establish, then only during extended drought | Pet-safe |
| Tepary Bean | Direct sun (at least 4-6 hours) | Once every 7–14 days once established; minimal irrigation needed | Pet-safe |
| Tessellated Vanda | Direct sun (at least 4-6 hours) | Daily in heat; every 2-3 days in cool, low-light spells | Pet-safe |
| 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 Blazing Star | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; minimal once established | 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 Basil | Direct sun (at least 4-6 hours) | Every 2–3 days in warm weather; less in cool seasons | Pet-safe |
| Thai Basil | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, roughly every 2-4 days | Pet-safe |
| Thai Mountain Palm | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer, fortnightly in cooler months | Pet-safe |
| The Blues Little Bluestem | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the first growing season; minimal once established | Pet-safe |
| The Blues Little Bluestem | Direct sun (at least 4-6 hours) | Weekly for first season; every 3–4 weeks or rain-fed once established | Pet-safe |
| The Bride pearlbush | Direct sun (at least 4-6 hours) | Weekly during establishment; once established, every 2–3 weeks or during dry spells | Pet-safe |
| The Fairy Rose | Direct sun (at least 4-6 hours) | Deeply once a week in the growing season, more during heatwaves | Pet-safe |
| 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 |
| Therese Bugnet Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Thick Gongora | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; every 10–14 days in winter rest | Pet-safe |
| Thick-leaf Goldfish Plant | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry | Pet-safe |
| Thiessen saskatoon | Direct sun (at least 4-6 hours) | Weekly during dry periods and fruit development | Pet-safe |
| Thimble Cactus | Direct sun (at least 4-6 hours) | When fully dry, roughly every 10-14 days in summer; keep nearly dry in winter | Pet-safe |
| Thin-Leaved Air Plant | Bright indirect light (just back from a sunny window) | 2–3 times per week | Pet-safe |
| Thin-Leaved Sunflower | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks; keep moderately moist | Pet-safe |
| Thistle Sage | Direct sun (at least 4-6 hours) | Very infrequent — once established, monthly or less in summer | Pet-safe |
| Thornless Evergreen Blackberry | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, about every 5-10 days, more during fruiting | Pet-safe |
| Thorny Bamboo | Direct sun (at least 4-6 hours) | 2-3 times per week during establishment and growing season; drought-tolerant once established | Pet-safe |
| Thorny Chin Cactus | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; every 5–8 weeks in winter | Pet-safe |
| Thoroughwax | Direct sun (at least 4-6 hours) | Every 5–7 days; allow top inch to partially dry between waterings | Pet-safe |
| Threadleaf Coreopsis | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Threadleaf Tickseed 'Moonbeam' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days; infrequent once established | 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 Vanda | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days when cool and dim | Pet-safe |
| Three-Nerved Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days (allow soil to dry between waterings) | Pet-safe |
| Thrift | Direct sun (at least 4-6 hours) | Every 7–14 days, allowing soil to dry between waterings | Pet-safe |
| Thunberg Spirea | Direct sun (at least 4-6 hours) | Weekly until established; occasional deep watering thereafter | Pet-safe |
| Thunberg's astilbe | Medium indirect light (a couple of metres from a window) | Regular — every 2–3 days in warm weather; reduce in cool, overcast periods | Pet-safe |
| Thyme | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 10-14 days | Pet-safe |
| Tidal Wave silver petunia | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 7–10 days in garden beds | Pet-safe |
| Tiger Crow Orchid | Bright indirect light (just back from a sunny window) | When the bark mix is nearly dry, roughly every 5-7 days in growth | Pet-safe |
| Tilia cordata | Direct sun (at least 4-6 hours) | Water young trees deeply every 7-14 days in dry spells for the first two seasons; established trees are largely self-sufficient | Pet-safe |
| Tilia tomentosa 'Petiolaris' | Direct sun (at least 4-6 hours) | Deep watering every 7-14 days during dry weather for the first two or three seasons; established trees seldom need it | Pet-safe |
| Tillandsia bergeri | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly; mist between soaks in dry air | Pet-safe |
| Tillandsia caput-medusae | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes every 1-2 weeks; mist between soaks | Pet-safe |
| Tillandsia Streptophylla | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes every 1-2 weeks; mist sparingly between soaks | Pet-safe |
| Tillandsia tectorum | Bright indirect light (just back from a sunny window) | Mist lightly every 10-14 days; soak only rarely | Pet-safe |
| Tillandsia xerographica | Bright indirect light (just back from a sunny window) | Soak for 20-30 minutes every 10-14 days, more often in dry heat | Pet-safe |
| Tiny Dunce Cap | Direct sun (at least 4-6 hours) | Every 1–2 weeks during active growth; very sparingly in winter dormancy | Pet-safe |
| Tiny Sea Lavender | Direct sun (at least 4-6 hours) | Low — water sparingly, allowing soil to dry completely between sessions | Pet-safe |
| Tiny 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-calyx Columnea | Bright indirect light (just back from a sunny window) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Tiramisu Heuchera | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water when the top 2-3 cm is dry, roughly every 5-7 days in summer | Pet-safe |
| 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 |
| Tompa Norway Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days when establishing; deep watering as the top few cm of soil dry | Pet-safe |
| Tongue Fern | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of medium is dry, roughly every 7-10 days | Pet-safe |
| Toothed Fly Bush | Direct sun (at least 4-6 hours) | Keep substrate evenly moist; water every 2–4 days with pure water only | Pet-safe |
| Topeka Purple Coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once mature (every 3–4 weeks in dry spells) | Pet-safe |
| Topsy Turvy Echeveria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Trachelospermum asiaticum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days while establishing | Pet-safe |
| Trachelospermum jasminoides 'Variegatum' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days in growth | Pet-safe |
| Trailing Achimenes | Bright indirect light (just back from a sunny window) | Consistently moist but never waterlogged during the growing season; completely dry in winter dormancy | Pet-safe |
| Trailing African daisy | Direct sun (at least 4-6 hours) | Once or twice a week during active growth; reduce to once a week or less once established | Pet-safe |
| Trailing Elephant Bush | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 2–3 weeks in winter | Pet-safe |
| Trailing globe amaranth | Direct sun (at least 4-6 hours) | Every 5–7 days; quite drought-tolerant | Pet-safe |
| Trailing Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks (allow soil to dry completely between waterings) | Pet-safe |
| Trailing Jade Peperomia | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring/summer; less in winter | Pet-safe |
| Transparent Moor Grass | Direct sun (at least 4-6 hours) | Every 7-14 days; keep moderately moist | Pet-safe |
| Transparent Tall Moor Grass | Bright indirect light (just back from a sunny window) | Weekly during establishment; less once settled | Pet-safe |
| Transparent-Leaf Peperomia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (allow compost to dry between waterings) | Pet-safe |
| Tree heath | Direct sun (at least 4-6 hours) | Fortnightly during the first growing season; drought-tolerant once established | Pet-safe |
| Tree-Like Pilosocereus | Direct sun (at least 4-6 hours) | When soil is dry to mid-depth, roughly every 10-14 days in summer; monthly in winter | Pet-safe |
| Tremula Pteris Fern | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of mix is dry, roughly every 4-6 days | Pet-safe |
| Triangle palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Triangle Staghorn Fern | Bright indirect light (just back from a sunny window) | When the mount or shield fronds feel dry, soak every 7-14 days in summer | Pet-safe |
| Triangular Masdevallia | Medium indirect light (a couple of metres from a window) | Daily in hot weather; every 2–3 days in spring and autumn | Pet-safe |
| Tricolor Sage | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-14 days once established | Pet-safe |
| Tristar Strawberry | Direct sun (at least 4-6 hours) | Every 3–5 days; keep soil consistently moist to 5 cm depth | Pet-safe |
| Tropical pitcher plant | Bright indirect light (just back from a sunny window) | Keep the compost damp at all times, never bone-dry; in practice water with pure water every 2-4 days depending on warmth | Pet-safe |
| Tropical Pitcher Plant | Bright indirect light (just back from a sunny window) | Keep media constantly moist; water every 2-4 days with mineral-free water | Pet-safe |
| Tropical Sage | Medium indirect light (a couple of metres from a window) | Regular while establishing; reduced once established | Pet-safe |
| True Date Palm | Direct sun (at least 4-6 hours) | Deep watering every 7-14 days; consistent moisture at the roots during fruiting | Pet-safe |
| Truncate Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Tsusima Holly Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, roughly every 5-7 days | Pet-safe |
| Tuberous Catmint | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal watering in winter dormancy | Pet-safe |
| Tufted Fescue | Direct sun (at least 4-6 hours) | Every 10–14 days when established; more frequently for newly planted specimens | Pet-safe |
| Tufted Loosestrife | Medium indirect light (a couple of metres from a window) | Permanently wet to shallow aquatic; bog garden or shallow pond margin | Pet-safe |
| Tufted Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days; minimal once established | Pet-safe |
| Tulameen Raspberry | Direct sun (at least 4-6 hours) | Keep soil evenly moist, especially from flowering through harvest; water deeply in dry spells | Pet-safe |
| 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 |
| Tulsi Kapoor | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days | Pet-safe |
| 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 Head Barrel | Direct sun (at least 4-6 hours) | When soil is completely dry, approximately every 10-14 days in the growing season; every 4-6 weeks in winter | Pet-safe |
| Turkestan Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; sparingly in autumn; almost none in winter | Pet-safe |
| Turkish Catmint | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; very sparingly in winter | Pet-safe |
| Turkish Hazel | Direct sun (at least 4-6 hours) | Water deeply every 7-14 days for the first two or three seasons; established trees seldom need watering | Pet-safe |
| Turkish Red Sage | Bright indirect light (just back from a sunny window) | Allow to dry between waterings | Pet-safe |
| Turkish Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Pet-safe |
| Turkish White Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; minimal once dormant in summer heat | Pet-safe |
| Turnip | Direct sun (at least 4-6 hours) | Weekly deep watering | Pet-safe |
| Turquoise Puya | Direct sun (at least 4-6 hours) | weekly in summer, monthly in winter | Pet-safe |
| Tuscan Blue Rosemary | Direct sun (at least 4-6 hours) | Every 7–14 days; allow soil to dry thoroughly between waterings | Pet-safe |
| Tuscan Blue Rosemary | Direct sun (at least 4-6 hours) | When the soil is dry several centimetres down, roughly every 1-2 weeks; minimal in winter | 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 |
| Twinspur | Direct sun (at least 4-6 hours) | 2–3 times per week during active growth; reduce during cooler periods | 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 |
| Two-Color Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in the winter rest | Pet-safe |
| Two-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-Ranked Aechmea | Bright indirect light (just back from a sunny window) | Refresh central cup every 7–10 days; water soil every 2–3 weeks | Pet-safe |
| Two-Row Stonecrop | Direct sun (at least 4-6 hours) | Every 10-14 days until established; essentially rain-fed once rooted | Pet-safe |
| Two-Spiked Billbergia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); cup refreshed every 2–4 weeks | Pet-safe |
| Umbrella Bamboo | Medium indirect light (a couple of metres from a window) | Twice weekly during establishment; every 5–7 days in summer once established | Pet-safe |
| Umbrella Magnolia | Medium indirect light (a couple of metres from a window) | Weekly during dry spells; keep soil evenly moist but not waterlogged | Pet-safe |
| 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 Peperomia | Bright indirect light (just back from a sunny window) | Every 10-14 days in the growing season; less in winter | Pet-safe |
| Upright European Hornbeam | Direct sun (at least 4-6 hours) | Moderate; water regularly for first 2–3 seasons; rainfall-dependent once established | Pet-safe |
| Upright Nidularium | Bright indirect light (just back from a sunny window) | Weekly during growing season; reduce in winter | Pet-safe |
| Upright Prairie Coneflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very drought-tolerant | Pet-safe |
| Uproar Rose zinnia | Direct sun (at least 4-6 hours) | Regular; deep watering 2–3 times per week at soil level | Pet-safe |
| Ursula's Red Painted Fern | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season, reduce in winter | Pet-safe |
| Uvaia | Direct sun (at least 4-6 hours) | Weekly; keep consistently moist during establishment, more drought-tolerant once mature | Pet-safe |
| Valais fescue | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; more frequent only during establishment | Pet-safe |
| Vanda 'Fuchs Delight' | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days when cool or low-light | Pet-safe |
| Vanda 'Miss Joaquim' | Direct sun (at least 4-6 hours) | Daily in warm, bright conditions; every 2-3 days if cooler | Pet-safe |
| Vanda 'Robert's Delight' | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days in cool or dormant spells | Pet-safe |
| Vandeleur's Cape Primrose | Bright indirect light (just back from a sunny window) | Every 10–14 days; allow compost to dry slightly between waterings | Pet-safe |
| Vanilla Orchid | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm of medium is dry, roughly every 5-7 days in summer; every 10-14 days in winter | Pet-safe |
| Vanuatu Fan Palm | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-9 days | Pet-safe |
| 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 |
| Variegated Basket Grass | Bright indirect light (just back from a sunny window) | Every 5–7 days in growing season; every 10–14 days in winter | Pet-safe |
| Variegated Cast Iron Plant | Low light (north window or shaded room) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Variegated Elephant Bush | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in summer, monthly in winter | Pet-safe |
| Variegated Elephant Bush | Bright indirect light (just back from a sunny window) | When the top 3–4 cm of soil is dry, roughly every 10–14 days in summer and every 3–4 weeks in winter | Pet-safe |
| Variegated Greater Pond Sedge | Bright indirect light (just back from a sunny window) | Keep consistently wet — tolerates standing water | Pet-safe |
| 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 Purple Moor Grass | Bright indirect light (just back from a sunny window) | Regular; keep soil consistently moist | Pet-safe |
| Variegated Purple Moor Grass | Bright indirect light (just back from a sunny window) | Weekly during growing season; keep consistently moist | Pet-safe |
| variegated silver grass | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in autumn and winter | Pet-safe |
| Variegated Spider Plant | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| Variegated String of Hearts | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days | Pet-safe |
| Variegated Sweetheart Hoya | Bright indirect light (just back from a sunny window) | When the mix is almost fully dry, every 2-3 weeks | Pet-safe |
| Variegated Velvet Grass | 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 |
| 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 |
| Vasse's Staghorn Fern | Bright indirect light (just back from a sunny window) | Weekly soaking in the growing season; fortnightly in cooler months | Pet-safe |
| Veilchenblau Rose | Bright indirect light (just back from a sunny window) | Deeply once or twice weekly while establishing; mature plants when the top few centimetres of soil dry, and they tolerate some drought | Pet-safe |
| Veitch Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once mature | Pet-safe |
| Velvet Ash | Direct sun (at least 4-6 hours) | Low once established; deep watering every 2–4 weeks in summer heat | Pet-safe |
| Velvet Queen sunflower | Direct sun (at least 4-6 hours) | Weekly, more often in hot dry spells | Pet-safe |
| Venus Maidenhair Fern | Bright indirect light (just back from a sunny window) | Keep constantly moist, often every 2-3 days | Pet-safe |
| 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 |
| Vetter's Oregano | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–4 weeks in cooler months | Pet-safe |
| Victoria Lady Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; reduce in winter | Pet-safe |
| Vidal's Lady Fern | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; reduce in winter | Pet-safe |
| Viking black chokeberry | Direct sun (at least 4-6 hours) | Weekly during establishment; occasional once mature | Pet-safe |
| Vining Peperomia | Medium indirect light (a couple of metres from a window) | Every 7–10 days in spring/summer; every 2–3 weeks in winter | Pet-safe |
| Viola 'Sorbet Raspberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 3-5 days; containers more often | Pet-safe |
| Viola cornuta 'Etain' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, generally every 3-5 days; more in containers and heat | Pet-safe |
| Violet petunia | Direct sun (at least 4-6 hours) | Every 7–10 days in borders; containers may need more frequent watering | Pet-safe |
| Violet Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Virgin Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 10–14 days in autumn–winter rest | Pet-safe |
| Virginia Mountain Mint | Direct sun (at least 4-6 hours) | Moderate — consistently moist soil preferred | Pet-safe |
| Virginia Pine Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, frequently daily in summer and every few days in cooler months | Pet-safe |
| Vivellii winter heath | Direct sun (at least 4-6 hours) | Weekly for new plantings; every 2–3 weeks for established plants during dry periods | Pet-safe |
| Volcanic Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Vranja quince | Direct sun (at least 4-6 hours) | Weekly during dry spells; tolerates brief periods of drought once established | Pet-safe |
| Vriesea 'Poelmanii' | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Vriesea carinata | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Vriesea fosteriana | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Vriesea hieroglyphica | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Vriesea platynema | Bright indirect light (just back from a sunny window) | Keep the central cup filled; flush and refill every 1-2 weeks | Pet-safe |
| Wagner's Sage | Bright indirect light (just back from a sunny window) | Water regularly to maintain consistent moisture | Pet-safe |
| Waldbrunn Spruce | Direct sun (at least 4-6 hours) | Every 7-10 days while establishing; deep watering when the top 5 cm of soil dries | Pet-safe |
| Walker's Low Catmint | Direct sun (at least 4-6 hours) | Every 7–14 days once established | Pet-safe |
| Wall Rue | Bright indirect light (just back from a sunny window) | Rarely needs watering in the ground; water container plants only when the crevice substrate dries | Pet-safe |
| Wallich's Cranesbill | Bright indirect light (just back from a sunny window) | Once or twice weekly during dry spells once established | Pet-safe |
| Wallichii Staghorn Fern | Bright indirect light (just back from a sunny window) | When the shield fronds and mounting medium feel dry, roughly every 7-10 days in summer | Pet-safe |
| Wallis Fescue | Direct sun (at least 4-6 hours) | Every 14–21 days when established; minimal in winter | Pet-safe |
| Wallis's Dragon Orchid | Medium indirect light (a couple of metres from a window) | Every 2–3 days; medium kept continuously moist | Pet-safe |
| Wandering Orthophytum | Bright indirect light (just back from a sunny window) | Every 7–10 days in growth; every 14 days in winter | Pet-safe |
| 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 |
| Washington Hawthorn | Direct sun (at least 4-6 hours) | Weekly deep watering in the first two seasons, then only in prolonged drought | Pet-safe |
| Watermelon Begonia | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Watermelon Peperomia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-14 days in summer and every 2-3 weeks in winter | Pet-safe |
| Wave Petunia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in baskets and hot weather | Pet-safe |
| Wavyleaf Coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment (first season); monthly or rainfall-dependent once mature | Pet-safe |
| Wax plant | Bright indirect light (just back from a sunny window) | When the soil is dry, every 10-14 days | Pet-safe |
| Webb's Wonderful Lettuce | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 2-3 days or whenever the top 1-2 cm feels dry | Pet-safe |
| Wedge-Leaved Savory | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Weeping Brown Sedge | Bright indirect light (just back from a sunny window) | Weekly or when the top 3 cm of soil is dry | Pet-safe |
| Weeping Eastern Hemlock | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks; more in hot or dry conditions | Pet-safe |
| Weeping European Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; less once established | Pet-safe |
| Weeping Giant Sequoia | Direct sun (at least 4-6 hours) | Every 1–2 weeks when young; monthly once established in moist climates | Pet-safe |
| Weeping Love Grass | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; weekly during establishment | Pet-safe |
| Weigela 'Nana Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days once established | Pet-safe |
| Weilbach's Aechmea | Bright indirect light (just back from a sunny window) | Every 2–3 weeks (soil); refresh central tank every 3–4 weeks | Pet-safe |
| Weilbach'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 cm is dry, roughly every 10-14 days | Pet-safe |
| 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 |
| 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 |
| West Indian Gherkin | Direct sun (at least 4-6 hours) | 2–3 times per week during active growth | Pet-safe |
| West Texas Sage | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Western Hemlock | Medium indirect light (a couple of metres from a window) | Weekly during establishment; regular moisture long-term | Pet-safe |
| Western Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; thereafter relies on natural precipitation | Pet-safe |
| Western Maidenhair Fern | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil is dry, roughly every 4-6 days | Pet-safe |
| Western Red Cedar | Direct sun (at least 4-6 hours) | Regular — water deeply once or twice a week until established; drought-sensitive | Pet-safe |
| Western Spirea | Direct sun (at least 4-6 hours) | Every 5-7 days or as needed to keep soil consistently moist | Pet-safe |
| Western Sunflower | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; extremely drought-tolerant | Pet-safe |
| Western Sword Fern | Low light (north window or shaded room) | When the top 3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Wheeler's Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Whinham's Industry Gooseberry | Direct sun (at least 4-6 hours) | Water deeply weekly during dry spells, especially while fruit is swelling | Pet-safe |
| Whip Brassavola | Bright indirect light (just back from a sunny window) | Every 3–5 days in summer; every 7–10 days in winter | Pet-safe |
| Whirling Butterflies Gaura | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days during the growing season | Pet-safe |
| Whirlwind Blue Fan Flower | Direct sun (at least 4-6 hours) | When the top 2-3 cm of potting mix is dry, roughly every 4-6 days in summer | Pet-safe |
| White Beardtongue | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; minimal in winter | Pet-safe |
| White Bergamot | Medium indirect light (a couple of metres from a window) | Twice weekly in summer; weekly in cooler months | Pet-safe |
| White Clover | Direct sun (at least 4-6 hours) | Weekly in dry weather; largely self-sufficient in temperate climates | Pet-safe |
| White Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–14 days; very drought-tolerant once established | Pet-safe |
| White Dendrobium | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; every 2–3 weeks in winter rest | Pet-safe |
| White 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 Fir | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; largely drought-tolerant once mature | 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 Horehound | Direct sun (at least 4-6 hours) | Every 10-14 days once established; drought-tolerant | Pet-safe |
| White laceflower | Direct sun (at least 4-6 hours) | Every 5–7 days; allow the top 2 cm of soil to dry between waterings | Pet-safe |
| White Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and autumn; once every 2–3 weeks in summer dry rest | Pet-safe |
| White mountain heather | Direct sun (at least 4-6 hours) | Consistently moist during the growing season; reduce in winter | Pet-safe |
| White Mulberry | Direct sun (at least 4-6 hours) | Every 7-14 days while young; established trees are drought-tolerant | Pet-safe |
| White Perfection Darley Dale heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| White Sage | Direct sun (at least 4-6 hours) | Sparingly — when soil is bone dry, roughly every 10-14 days in heat and far less otherwise | Pet-safe |
| White Spider Orchid | Bright indirect light (just back from a sunny window) | Moderate during autumn to spring; completely dry in summer | Pet-safe |
| White Stonecrop | Direct sun (at least 4-6 hours) | When soil is dry, roughly every 10-14 days in summer; little to none in winter | Pet-safe |
| White-Bark Magnolia | Bright indirect light (just back from a sunny window) | Weekly during dry spells for the first 3 years; every 2 weeks when established | Pet-safe |
| White-Flowered 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-Powder Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; fortnightly when dormant | Pet-safe |
| 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 |
| Whorled Rosinweed | Bright indirect light (just back from a sunny window) | Every 1-2 weeks once established | Pet-safe |
| Wickwar Flame heather | Direct sun (at least 4-6 hours) | Weekly during establishment, then as needed | 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 Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Pet-safe |
| Wild Basil | Bright indirect light (just back from a sunny window) | Low — water sparingly once established | Pet-safe |
| Wild nemesia | Direct sun (at least 4-6 hours) | Every 7–14 days once established; more frequently when young | Pet-safe |
| Wild Radish | Direct sun (at least 4-6 hours) | Drought-tolerant once established; water weekly if dry | Pet-safe |
| Wild Rocket | Direct sun (at least 4-6 hours) | Once established, water only when the top 3-4 cm of soil is dry, roughly every 7-14 days | Pet-safe |
| Wild Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then rarely once mature | Pet-safe |
| Wild Strawberry | Bright indirect light (just back from a sunny window) | Low to moderate — drought-tolerant; water during prolonged dry spells | Pet-safe |
| Wild Strawberry | Bright indirect light (just back from a sunny window) | When the top few cm of soil is dry, about weekly; more in heat or full sun | Pet-safe |
| Wild Thyme | Direct sun (at least 4-6 hours) | Infrequent; allow soil to dry fully between waterings | 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 |
| Wildeve Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while growing, increasing in heat and on free-draining soils | Pet-safe |
| William Shakespeare 2000 Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | Pet-safe |
| 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 Spruce | Direct sun (at least 4-6 hours) | Weekly when young; established trees are drought-tolerant | Pet-safe |
| 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-Colored Alcantarea | Direct sun (at least 4-6 hours) | Keep the central tank filled with fresh water; water the root zone when the top 3-4 cm is dry, roughly every 7-14 days | Pet-safe |
| 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 Glow Bergenia | Medium indirect light (a couple of metres from a window) | Every 7–14 days during the growing season; very little in winter | Pet-safe |
| Winter heath | Direct sun (at least 4-6 hours) | Established plants: every 2–3 weeks in dry spells; new plants: weekly for the first season | Pet-safe |
| Winter Melon | Direct sun (at least 4-6 hours) | Every 2–3 days; deeply and consistently | Pet-safe |
| Winter savory | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Wisley 2008 Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season; more in heat or sandy soil | Pet-safe |
| Witchgrass | Direct sun (at least 4-6 hours) | Rainfall sufficient in most climates; supplemental water only if very dry | Pet-safe |
| Witteberg Cone Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn–winter; almost none in summer | Pet-safe |
| Wonderful Pomegranate | Direct sun (at least 4-6 hours) | Water regularly while flowering and fruiting; let soil dry between waterings once established | Pet-safe |
| Wood Avens | Medium indirect light (a couple of metres from a window) | Low to moderate — rain-fed in shade | Pet-safe |
| Wood Club-rush | Medium indirect light (a couple of metres from a window) | Permanently moist to wet; tolerates shallow standing water | Pet-safe |
| Wood Melick | Medium indirect light (a couple of metres from a window) | Infrequently; drought-tolerant under shade | Pet-safe |
| wood small-reed | Direct sun (at least 4-6 hours) | Drought-tolerant once established; occasional deep watering in first season | Pet-safe |
| Woodland Sage | Direct sun (at least 4-6 hours) | Low to moderate; drought tolerant once established | Pet-safe |
| Woodland Sunflower | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks; drought-tolerant once established | Pet-safe |
| 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 Rose | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Woolly Thyme | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-14 days once established | 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 |
| Wrinkled Elatostema | Low light (north window or shaded room) | Every 3–5 days; soil should remain consistently moist | Pet-safe |
| Wulfen's Alyssum | Direct sun (at least 4-6 hours) | Every 14–21 days during growing season; very little in winter | Pet-safe |
| 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 Birch | Direct sun (at least 4-6 hours) | Consistently moist; water deeply 1-2 times per week during establishment and in dry spells | Pet-safe |
| Yellow 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 coneflower | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; every 2–4 weeks once established | Pet-safe |
| Yellow Dragon Fruit | Direct sun (at least 4-6 hours) | Every 10-14 days in growth; let the top half of the mix dry first | Pet-safe |
| Yellow Dragon Fruit | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Yellow Giant Hyssop | Bright indirect light (just back from a sunny window) | Every 7–10 days during the growing season; minimal in winter | Pet-safe |
| Yellow Groove Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; every 2 weeks when dormant | Pet-safe |
| Yellow Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; minimal to none in winter | Pet-safe |
| Yellow Latan Palm | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 14–21 days in winter | Pet-safe |
| Yellow Latan Palm | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Yellow 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 Mombin | Direct sun (at least 4-6 hours) | Every 7–14 days; highly drought-tolerant when established | Pet-safe |
| Yellow Mountain Saxifrage | Direct sun (at least 4-6 hours) | Every 2–4 days during the growing season; keep consistently moist | Pet-safe |
| Yellow Pitaya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 2-4 weeks in winter | Pet-safe |
| Yellow 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 Whitlowgrass | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; minimal in winter | Pet-safe |
| Yellow-Bracted Nidularium | Medium indirect light (a couple of metres from a window) | Refill central cup weekly; substrate every 10–14 days | Pet-safe |
| Yellow-Spike Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Yellow-Twig Dogwood | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | Pet-safe |
| Yellow-White Maxillaria | Bright indirect light (just back from a sunny window) | Every 2–3 days in growth, every 4–5 days in winter | Pet-safe |
| Yellowish Miltonia | Bright indirect light (just back from a sunny window) | Every 2–3 days in summer, every 4–5 days in winter | Pet-safe |
| Yokosca Lady Fern | Low light (north window or shaded room) | Every 2–3 days; keep soil moist to wet | Pet-safe |
| Young's Weeping Birch | Bright indirect light (just back from a sunny window) | Weekly during establishment and dry spells; every 2 weeks once mature | Pet-safe |
| Yulan Magnolia | Direct sun (at least 4-6 hours) | Weekly when young; established trees need water during prolonged dry spells | Pet-safe |
| Yuletide Sasanqua Camellia | Bright indirect light (just back from a sunny window) | Every 5-7 days in summer; reduce in winter but do not let dry out | Pet-safe |
| Yunnan Cypress | Direct sun (at least 4-6 hours) | Regular during establishment; drought-tolerant once mature | Pet-safe |
| Zebra Grass | Direct sun (at least 4-6 hours) | Weekly for the first season; every 2–3 weeks once established | 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 |
| Zigzag Bamboo | Direct sun (at least 4-6 hours) | Weekly in the growing season; fortnightly in winter | Pet-safe |
| Zinnia 'Profusion' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, every 4-7 days; containers more often | Pet-safe |
| Zinnia elegans 'Profusion Cherry' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days | Pet-safe |
| Zinnia elegans 'Zahara Starlight Rose' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days | Pet-safe |
| Zinnia haageana 'Old Mexico' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days | Pet-safe |
| Zombie Palm | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; every 21–28 days in winter | Pet-safe |
| Zoys's Bellflower | Direct sun (at least 4-6 hours) | Allow soil to dry between waterings; very sparingly in winter | Pet-safe |