Best plants
Most lists make you choose between a flowering plant and a safe one. These clear both bars: ASPCA non-toxic to cats and dogs, and grown for their blooms — so a pet household can still have colour on the windowsill.
How this list is built: plants that are both ASPCA non-toxic to cats and dogs and grown for their flowers— filtered from Growli's structured plant-care library, not hand-picked, so it stays consistent and checkable.
| Plant | Light | Water | Pets |
|---|---|---|---|
| Acer capillipes | Bright indirect light (just back from a sunny window) | Water deeply weekly while establishing; supplement in summer droughts | Pet-safe |
| Acer griseum | Direct sun (at least 4-6 hours) | Water deeply weekly while establishing; supplement in summer droughts | Pet-safe |
| Acer japonicum 'Aconitifolium' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply in dry spells | Pet-safe |
| Acer palmatum 'Atropurpureum' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply through dry weather | Pet-safe |
| Acer palmatum 'Butterfly' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist, more often in pots and heat | Pet-safe |
| Acer palmatum 'Dissectum' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist, more often in pots and heat | Pet-safe |
| Acer palmatum 'Garnet' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist, more often in pots and heat | Pet-safe |
| Acer palmatum 'Orangeola' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist, more often in containers and heat | Pet-safe |
| Acer rubrum '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 |
| Achimenes 'Cascade Violet Night' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, roughly every 4-6 days | Pet-safe |
| Achimenes 'Peach Blossom' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, roughly every 4-6 days | Pet-safe |
| Achimenes 'Tarantella' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, roughly every 4-6 days | Pet-safe |
| Achimenes erecta | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, roughly every 4-6 days | Pet-safe |
| Achimenes grandiflora | Bright indirect light (just back from a sunny window) | Keep evenly moist while in growth, roughly every 4-6 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 |
| Adiantum venustum | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, roughly every 4-6 days | 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 |
| Aerangis biloba | Bright indirect light (just back from a sunny window) | Every 1-3 days when mounted; every 3-5 days in a small basket, kept lightly moist | Pet-safe |
| Aerangis luteoalba | Bright indirect light (just back from a sunny window) | Every 1-3 days when mounted; every 3-5 days in a small basket, keeping it lightly moist | Pet-safe |
| Aeschynanthus 'Black Pagoda' | 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 |
| Aeschynanthus 'Mona Lisa' | 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 |
| Aeschynanthus 'Rasta' | 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 |
| Aeschynanthus lobbianus | 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 |
| Aeschynanthus marmoratus | 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 |
| Aeschynanthus pulcher | 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 |
| Aeschynanthus radicans 'Curly Q' | 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 |
| Aeschynanthus speciosus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 4-8 days in growth | Pet-safe |
| Aeschynanthus tricolor | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-9 days | 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 Tamarisk | Direct sun (at least 4-6 hours) | Low once established; moderate during establishment | Pet-safe |
| African violet | Medium indirect light (a couple of metres from a window) | When the top of the soil feels just dry, every 5-7 days | Pet-safe |
| African Violet 'Blue Nile' | Bright indirect light (just back from a sunny window) | When the top of the soil feels barely dry, roughly every 5-7 days | Pet-safe |
| African Violet 'Optimara EverFloris' | Bright indirect light (just back from a sunny window) | When the top of the soil feels just dry, about every 5-7 days | Pet-safe |
| African Violet 'Optimara Little Maya' | Bright indirect light (just back from a sunny window) | When the top of the soil feels barely dry, roughly every 5-7 days | Pet-safe |
| African Violet 'Optimara' | Bright indirect light (just back from a sunny window) | When the top of the soil feels barely dry, roughly every 5-7 days | Pet-safe |
| African Violet 'Rob's Boolaroo' | 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 |
| 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-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 |
| 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 |
| Algerian Fir | Direct sun (at least 4-6 hours) | Low to moderate; highly drought-tolerant once established | Pet-safe |
| Alma Potschke aster | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce after flowering | 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 bearberry | Direct sun (at least 4-6 hours) | Moderate; keep soil moist but well-drained; water regularly during dry periods | Pet-safe |
| Alpine Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Alpine Mouse-ear | Direct sun (at least 4-6 hours) | Sparingly — allow soil to dry between waterings; minimal winter moisture | Pet-safe |
| Alpine Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Alsobia 'San Miguel' | 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 |
| Alsobia dianthiflora | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, roughly every 4-7 days | Pet-safe |
| Altissimo Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the first season; established plants when the top 5 cm of soil is dry | Pet-safe |
| Amazon Moonflower Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of substrate is dry, roughly every 7-10 days in the growing season; every 2-3 weeks in a cooler rest period | Pet-safe |
| 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 alumroot | Medium indirect light (a couple of metres from a window) | Once or twice per week; reduce in winter | Pet-safe |
| American Basswood | Bright indirect light (just back from a sunny window) | Weekly during establishment; less once mature | Pet-safe |
| American White Water Lily | Direct sun (at least 4-6 hours) | Permanently aquatic — crown submerged 15–60 cm (6–24 in) below water surface | 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 |
| Angel Face Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | 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-scented Sage | Bright indirect light (just back from a sunny window) | Regular throughout the growing season | Pet-safe |
| Annual Phlox | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil evenly moist but not saturated | Pet-safe |
| Annual Phlox 'Sugar Stars' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 4-7 days | Pet-safe |
| Antirrhinum majus 'Chantilly Bronze' | 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 '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 |
| Apricot Sprite Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days once established; more frequent in containers | Pet-safe |
| Aptos Blue Redwood | Direct sun (at least 4-6 hours) | Weekly when young; every 1–2 weeks when established | Pet-safe |
| Arabian Jasmine | Direct sun (at least 4-6 hours) | Keep evenly moist in growth; water when the top 2-3 cm of soil dries, often every 3-5 days in warmth | Pet-safe |
| Arendsii astilbe | Medium indirect light (a couple of metres from a window) | 2–3 times per week in summer; weekly otherwise | Pet-safe |
| Argentine Giant Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 1-2 weeks in summer; keep dry in winter | Pet-safe |
| Armenian Speedwell | Direct sun (at least 4-6 hours) | Every 10–14 days during the growing season; little to none in winter. | Pet-safe |
| Aromatic Aster | Direct sun (at least 4-6 hours) | Water to establish, then rarely; very drought-tolerant | 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 |
| Ashy Sunflower | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; very drought-tolerant | Pet-safe |
| Asphodel Cranesbill | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduce in autumn | Pet-safe |
| Asplenium platyneuron | Low light (north window or shaded room) | Water when the top 2-3 cm is dry; tolerates short dry spells better than most ferns | Pet-safe |
| Aster '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 |
| 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 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 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 Feather Reed Grass | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, around weekly; tolerant of occasional wet ground | 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 |
| Baby Love Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season, more in heat or in pots | Pet-safe |
| Baby Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | 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 |
| Bacopa 'Scopia Gulliver Purple' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost starts to dry, often daily in warm weather | Pet-safe |
| Bacopa 'Snowtopia' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost begins to dry, often daily in warm weather | Pet-safe |
| Balkan Sage | Medium indirect light (a couple of metres from a window) | Weekly during dry spells | Pet-safe |
| Balkan Saxifrage | Direct sun (at least 4-6 hours) | Low — water at the base only; allow near-drying between waterings | Pet-safe |
| Ball Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, about every 7-10 days in summer; sparingly to none in winter | Pet-safe |
| Ballerina Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | Pet-safe |
| Balsam Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; naturally rainfall-sustained thereafter | Pet-safe |
| Bamboo Muhly | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter once established | 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 |
| 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 |
| 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 |
| Bear Tupelo | Bright indirect light (just back from a sunny window) | Regularly; keep consistently moist | Pet-safe |
| beautiful feather grass | Direct sun (at least 4-6 hours) | Weekly in the first season; minimal once established | Pet-safe |
| Beautiful Fuchsia | Bright indirect light (just back from a sunny window) | Water freely in growth; reduce in winter | Pet-safe |
| Beavertail Cactus | Direct sun (at least 4-6 hours) | Very sparingly when soil is bone dry, roughly every 3-4 weeks in summer; keep dry in winter | Pet-safe |
| 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) | Regular; water at soil level 2–3 times per week in dry weather | 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 |
| Beoley Gold heather | Direct sun (at least 4-6 hours) | Weekly during establishment; occasional watering once established in dry spells | 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 |
| Besom heath | Direct sun (at least 4-6 hours) | Weekly during establishment; largely self-sufficient once established | Pet-safe |
| Bicolor St Dabeoc's heath | Direct sun (at least 4-6 hours) | Moderate; water regularly to keep soil moist, particularly in dry spells | 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 Red Sage | Bright indirect light (just back from a sunny window) | Moderate; keep evenly moist, especially during establishment | 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 |
| Birchleaf Spirea | Direct sun (at least 4-6 hours) | Weekly until established; occasional watering in drought once mature | 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 |
| Bitterroot | Direct sun (at least 4-6 hours) | Winter rains / early spring only; bone dry from June to October | Pet-safe |
| Bitterroot Lewisia | Bright indirect light (just back from a sunny window) | Weekly in spring; monthly or less in summer dormancy | Pet-safe |
| Black 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 Flowering Sedge | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist to wet; water whenever the surface begins to dry | Pet-safe |
| Black Knight scabiosa | Direct sun (at least 4-6 hours) | Once or twice weekly | Pet-safe |
| Black Lily Magnolia | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduce in winter | Pet-safe |
| Black Medick | Direct sun (at least 4-6 hours) | Low to moderate | Pet-safe |
| Black Pagoda Lipstick Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Black Prince snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil consistently moist | Pet-safe |
| Black sedge | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; tolerates standing water | 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 |
| 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 |
| Blanket flower | Direct sun (at least 4-6 hours) | Every 7–14 days once established; water young plants more frequently | Pet-safe |
| Blaze Improved Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, more during heat | Pet-safe |
| Bloodgood Japanese Maple | Bright indirect light (just back from a sunny window) | When the top 3–5 cm of soil is dry, roughly every 5–7 days in summer; weekly to fortnightly in autumn and spring | Pet-safe |
| Blue Anise Sage | Bright indirect light (just back from a sunny window) | Weekly | Pet-safe |
| Blue Boy cornflower | Direct sun (at least 4-6 hours) | Every 7–10 days | 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 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 Oat Grass | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Pet-safe |
| Blue Pickerelweed | Direct sun (at least 4-6 hours) | Rooted marginal — grow in wet soil or water up to 15 cm (6 in) deep | 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 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 |
| bluejoint reedgrass | Direct sun (at least 4-6 hours) | Keep consistently moist to wet; suited to boggy and seasonally flooded ground | Pet-safe |
| Boat Orchid | Direct sun (at least 4-6 hours) | When the mix is dry, roughly every 7-10 days, less in winter | Pet-safe |
| Bonica Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | Pet-safe |
| Border Forsythia | Direct sun (at least 4-6 hours) | Weekly during the first year, then only in prolonged drought | Pet-safe |
| Boscobel 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 |
| Bottle Gentian | Medium indirect light (a couple of metres from a window) | Regular — keep soil consistently moist | 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 'Raspberry Ice' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 5-10 days | Pet-safe |
| Bougainvillea 'San Diego Red' | Direct sun (at least 4-6 hours) | Deep soak only when the top 5 cm of soil dries, about every 7-14 days | Pet-safe |
| Bowl Lotus | Direct sun (at least 4-6 hours) | Keep submerged at all times; never allow the rhizome to dry out | Pet-safe |
| Brandy Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season | Pet-safe |
| Brassia caudata | Bright indirect light (just back from a sunny window) | Water thoroughly, then let the top of the mix approach dryness; about every 5-7 days in growth | Pet-safe |
| Brazilian Edelweiss | Bright indirect light (just back from a sunny window) | When the top few cm of soil are dry during active growth; withhold during dormancy | Pet-safe |
| 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 |
| Brilliantissima red chokeberry | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate once established | 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 |
| Broad-Leaved Lime | Bright indirect light (just back from a sunny window) | Weekly during establishment; supplemental watering in prolonged drought | Pet-safe |
| Broad-leaved Pondweed | Direct sun (at least 4-6 hours) | Fully submerged aquatic; grows in 30 cm to 150 cm of water | Pet-safe |
| Broad-Leaved Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | 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 |
| Bromeliad | Bright indirect light (just back from a sunny window) | Keep the central cup filled, soil barely moist | Pet-safe |
| Broomsedge Bluestem | Direct sun (at least 4-6 hours) | Rainfall sufficient; no supplemental irrigation needed once established | Pet-safe |
| Buchanan's Sage | Bright indirect light (just back from a sunny window) | Every 5-7 days during the growing season | Pet-safe |
| Buff Beauty Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat or against a warm wall | Pet-safe |
| Bugle | Medium indirect light (a couple of metres from a window) | Moderate; keep evenly moist but never waterlogged | Pet-safe |
| 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 |
| 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 |
| Burser's Saxifrage | Bright indirect light (just back from a sunny window) | Every 7–10 days during growth; minimal 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 |
| Bushy Bluestem | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Buttonhole Orchid | Direct sun (at least 4-6 hours) | When the top of the mix dries, roughly every 5-9 days | 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 |
| 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 |
| Calendula | Direct sun (at least 4-6 hours) | Moderate — roughly weekly once established | Pet-safe |
| Calendula 'Indian Prince' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Calendula 'Radio' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly weekly | Pet-safe |
| Calibrachoa 'Cabaret Deep Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, often daily in summer baskets | Pet-safe |
| Calibrachoa 'MiniFamous Double Amethyst' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, often daily in hot weather | Pet-safe |
| Calibrachoa 'Superbells Lemon Slice' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, often daily in baskets during summer heat | Pet-safe |
| Calibrachoa 'Superbells Trailing Blue' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, frequently daily in summer baskets | Pet-safe |
| Calico 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 |
| 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 |
| Callus Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the top of the mix begins to dry, roughly every 5-7 days | Pet-safe |
| 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 'Alba Plena' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, every 7-10 days during active growth | Pet-safe |
| Camellia 'Anticipation' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days during the growing season | Pet-safe |
| Camellia 'Bob Hope' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during the growing season | Pet-safe |
| Camellia 'Brushfield's Yellow' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost or soil is dry, roughly every 5-7 days during active growth | Pet-safe |
| Camellia 'Debbie' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Camellia 'Dixie Knight' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil or compost is dry, roughly every 5-7 days in the growing season | Pet-safe |
| Camellia 'Donation' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry; keep evenly moist in late summer | Pet-safe |
| Camellia 'Elegans' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during growth | Pet-safe |
| Camellia 'Hagoromo' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost or soil is dry, roughly every 5-7 days during active growth | Pet-safe |
| Camellia 'J.C. Williams' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days during the growing season | Pet-safe |
| Camellia 'Jury's Yellow' | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply once or twice weekly in summer, especially during bud set | Pet-safe |
| Camellia 'Jury's Yellow' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days during active growth | Pet-safe |
| Camellia 'Kramer's Supreme' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during active growth | Pet-safe |
| Camellia 'Midnight Magic' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-10 days during active growth | Pet-safe |
| Camellia 'Mine-no-Yuki' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days through the growing season | Pet-safe |
| Camellia 'Nuccio's Gem' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-10 days in active growth | Pet-safe |
| Camellia 'Spring Festival' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | Pet-safe |
| Camellia 'Water Lily' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil or compost is dry, roughly every 5-7 days during the growing season | Pet-safe |
| Camellia 'Yuletide' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during active growth | Pet-safe |
| Campanula glomerata 'Superba' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries, about weekly in dry spells | Pet-safe |
| 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 |
| Campos Porto Fuchsia | Bright indirect light (just back from a sunny window) | Regular during growth; reduce in winter | Pet-safe |
| Can Can Heuchera | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm is dry, about every 5-7 days in summer | Pet-safe |
| Canary creeper | Bright indirect light (just back from a sunny window) | Water regularly to keep soil evenly moist, roughly every 5–7 days | Pet-safe |
| Canary Island 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 |
| Candy Stripe Creeping Phlox | Direct sun (at least 4-6 hours) | Every 7–10 days during the establishment year; drought-tolerant thereafter | 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 |
| Cape Primrose | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry; less in winter | Pet-safe |
| Cape Primrose | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Pet-safe |
| Cape Primrose 'Bristol's Party Girl' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| 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 |
| Cardinal Flower Sinningia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Pet-safe |
| Carding Mill Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week through the growing season, more in heat | Pet-safe |
| Carefree Wonder Rose | Direct sun (at least 4-6 hours) | Deep soak once or twice a week depending on heat | Pet-safe |
| Carolina Hemlock | Bright indirect light (just back from a sunny window) | Weekly during establishment; monthly deep watering once established in cool climates | Pet-safe |
| Carolina Queen Lotus | Direct sun (at least 4-6 hours) | Permanently submerged; maintain 5–15 cm (2–6 in) of water over the soil surface for established plants | Pet-safe |
| Carolina Spring Beauty | Medium indirect light (a couple of metres from a window) | Moderate during active spring growth; essentially none during summer–winter dormancy. | Pet-safe |
| 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 |
| 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 |
| 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 |
| Cattleya 'Why Not' | Bright indirect light (just back from a sunny window) | When the bark dries, roughly every 5-7 days in growth | Pet-safe |
| Cattleya luteola | Bright indirect light (just back from a sunny window) | When the mix approaches dry, roughly every 5-7 days in growth | Pet-safe |
| Cattleya orchid | Bright indirect light (just back from a sunny window) | When the bark mix is nearly dry, every 5-10 days | Pet-safe |
| Cattleya walkeriana | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 5-7 days in growth; reduced after flowering | Pet-safe |
| Caucasian Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | 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 Sage | Medium indirect light (a couple of metres from a window) | Moderate; water when top 5 cm of soil is dry | Pet-safe |
| Celosia (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 |
| 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 |
| Celosia argentea var. plumosa 'Fresh Look Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Celosia argentea var. spicata 'Cramer's Amazon' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days once established | Pet-safe |
| Centaurea 'Amethyst in Snow' | Direct sun (at least 4-6 hours) | Weekly through the first season; established clumps are drought-tolerant | 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 |
| Chagual | Direct sun (at least 4-6 hours) | every 7–14 days in summer, rarely in winter | 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 |
| Chantilly Peach snapdragon | Direct sun (at least 4-6 hours) | Every 5–7 days; keep soil evenly moist but not waterlogged | Pet-safe |
| Charlotte Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat | Pet-safe |
| Cherokee Chief Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering; more in summer drought | Pet-safe |
| Chiapas Sage | Medium indirect light (a couple of metres from a window) | Moderate — water when the top 2 cm of soil is dry | 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 |
| China aster | Direct sun (at least 4-6 hours) | 2–3 times per week in warm weather; once per week in cool conditions | 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 Douglas Fir | Direct sun (at least 4-6 hours) | Weekly when young; every 2 weeks once established | Pet-safe |
| Chinese Ground Orchid | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth (spring and summer), watering every 5-7 days; allow to dry out naturally in autumn as the plant goes dormant | 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 Larch | Direct sun (at least 4-6 hours) | Regular during establishment and growing season; reduced in dormancy | 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 |
| Chirita micromusa | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the soil surface just begins to dry, roughly every 4-7 days | Pet-safe |
| Chocolate Cosmos | Direct sun (at least 4-6 hours) | Keep evenly moist through summer; water roughly weekly, more in heat, less once dormant | Pet-safe |
| Chocolate orchid | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 5-9 days | Pet-safe |
| Christmas cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 7-10 days | Pet-safe |
| Christmas Orchid | Bright indirect light (just back from a sunny window) | When the bark dries, roughly every 5-7 days in growth | 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 |
| Cilician Fir | Direct sun (at least 4-6 hours) | Moderate; drought-tolerant once established | Pet-safe |
| Cinco de Mayo Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week through the growing season, more in heat | Pet-safe |
| 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 |
| 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 |
| 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 |
| Cleistocactus baumannii | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly weekly in summer; sparingly in winter | Pet-safe |
| Cleveland Sage | Direct sun (at least 4-6 hours) | Very infrequent after establishment — once monthly or less in summer | Pet-safe |
| Climbing Iceberg Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, more during heat | Pet-safe |
| Cloth of Gold Saxifrage | Medium indirect light (a couple of metres from a window) | Every 5–7 days; reduce in winter | 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 |
| Clubmoss cassiope | Bright indirect light (just back from a sunny window) | Regularly; soil should remain consistently moist throughout the growing season | 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 |
| Clustered bellflower | Direct sun (at least 4-6 hours) | Weekly during dry spells; moderate water needs | Pet-safe |
| Clustered Freesia | Direct sun (at least 4-6 hours) | Moderate during growth; reduce to dry after dormancy | Pet-safe |
| Clustered Sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days during the growing season; withhold entirely during dormancy | Pet-safe |
| 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 |
| Cockleshell butterfly orchid | Bright indirect light (just back from a sunny window) | Weekly in growth; reduce in winter | Pet-safe |
| Cockleshell Orchid | Bright indirect light (just back from a sunny window) | When the bark mix is nearly dry, roughly every 5-8 days | 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 |
| Coelogyne cristata | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; sparingly during the winter rest | Pet-safe |
| Coelogyne flaccida | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; reduced over winter | Pet-safe |
| Coelogyne massangeana | Bright indirect light (just back from a sunny window) | Every 3-6 days in growth; slightly reduced but rarely dry 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 |
| Columnea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 5-7 days | Pet-safe |
| Columnea 'Aladdin's Lamp' | 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 |
| Columnea 'Inferno' | 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 |
| Columnea 'Light Prince' | 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 |
| Columnea 'Robin' | 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 |
| Columnea hirta | 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 |
| Columnea linearis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is just dry, roughly every 5-7 days in growth | Pet-safe |
| Columnea microphylla | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is just dry, roughly every 5-7 days in growth | Pet-safe |
| Comb Speedwell | Direct sun (at least 4-6 hours) | Every 2–3 weeks; very drought-tolerant | 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 Club-rush | Direct sun (at least 4-6 hours) | Permanently aquatic; plant at 30–150 cm (12–60 in) water depth | Pet-safe |
| Common Cordgrass | Direct sun (at least 4-6 hours) | Permanent wetland/tidal immersion | Pet-safe |
| Common Dog Violet | Medium indirect light (a couple of metres from a window) | Water occasionally; keep soil consistently moist but not waterlogged. | 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 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 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 Mallow | Direct sun (at least 4-6 hours) | Low once established | Pet-safe |
| Common Quaking Grass | Direct sun (at least 4-6 hours) | Rarely; drought-tolerant once established | Pet-safe |
| Common Rush | Direct sun (at least 4-6 hours) | Permanently wet or standing water to 15 cm (6 in) deep | 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 |
| Common Water Hyacinth | Direct sun (at least 4-6 hours) | Free-floating aquatic — roots permanently submerged in open water | Pet-safe |
| Common Water Starwort | Medium indirect light (a couple of metres from a window) | Permanently submerged or marginal | Pet-safe |
| Compass Plant | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | Pet-safe |
| Compassion Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly when young; established plants when the top 5 cm of soil is dry | Pet-safe |
| Congo cockatoo impatiens | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil evenly moist | Pet-safe |
| Constance Spry Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while establishing; mature plants when the top few centimetres of soil dry | Pet-safe |
| Cook Pine | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| 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 'Electra' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Pet-safe |
| Coral Bells 'Lime Rickey' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil feels dry, roughly every 5-7 days during active growth | Pet-safe |
| Coral Bells 'Obsidian' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly weekly in growth; more in heat and for container plants | Pet-safe |
| Coral Bells 'Obsidian' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, approximately every 5-7 days during the growing season | Pet-safe |
| 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 Cattleya | Bright indirect light (just back from a sunny window) | When the mix dries, roughly every 5-7 days in growth | 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 'Sunray' | 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 'Uptick Gold and Bronze' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| 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 |
| Cornelia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in heat | Pet-safe |
| Cornflower | Direct sun (at least 4-6 hours) | Low to moderate — water during establishment only | Pet-safe |
| Cornish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once settled | Pet-safe |
| 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 |
| Corsage Orchid | Bright indirect light (just back from a sunny window) | When the mix has dried, roughly every 5-7 days in growth | 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 |
| 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 Globe Daisy | Direct sun (at least 4-6 hours) | Every 2–3 weeks when actively growing; minimal in winter | Pet-safe |
| Creeping Little Bluestem | Direct sun (at least 4-6 hours) | Minimal once established; rainfall usually sufficient on native sites | Pet-safe |
| Creeping New Zealand Cranesbill | Direct sun (at least 4-6 hours) | Every 7–10 days in the growing season; minimal in winter | Pet-safe |
| Creeping Sage | Bright indirect light (just back from a sunny window) | Weekly during the growing season | 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 |
| Crenate Orchid Cactus | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-14 days in the growing season; reduce to once every 3-4 weeks in winter | 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 Water Lily | Direct sun (at least 4-6 hours) | Permanently aquatic — crown submerged 15–50 cm (6–20 in) below water surface | Pet-safe |
| Cross-leaved heath | Direct sun (at least 4-6 hours) | Frequently — keep soil consistently moist to wet | Pet-safe |
| Cross-leaved Heath Alba Mollis | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 5–7 days in dry spells | Pet-safe |
| 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 |
| 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 |
| Crystal White narrowleaf zinnia | Direct sun (at least 4-6 hours) | Every 5–7 days; drought tolerant once established | 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 |
| Curly Pondweed | Bright indirect light (just back from a sunny window) | Fully submerged; grows in 30 cm to 2 m of water | Pet-safe |
| Cushion Draba | Direct sun (at least 4-6 hours) | Sparingly; soil must dry between waterings | Pet-safe |
| Cushion Sandwort | Direct sun (at least 4-6 hours) | Sparingly; allow to dry between waterings | Pet-safe |
| Cusp Blazing Star | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established; avoid irrigation in winter | Pet-safe |
| Cut-Leaved Cranesbill | Direct sun (at least 4-6 hours) | Moderate; keep soil moist during spring and summer | 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 |
| Cylindric Blazing Star | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; regular watering during establishment | Pet-safe |
| Cylindrical Rock Jasmine | Direct sun (at least 4-6 hours) | Very sparingly; almost none in winter | 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 |
| Cymbidium tracyanum | Bright indirect light (just back from a sunny window) | Every 3-6 days in growth; keep evenly moist in summer | Pet-safe |
| Cyperus Sedge | Bright indirect light (just back from a sunny window) | Permanently wet; shallow water up to 15 cm deep | Pet-safe |
| Dagger-Leaf Rush | Bright indirect light (just back from a sunny window) | Frequent to constant — soil must remain moist to wet at all times | Pet-safe |
| Dahurian Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; minimal once established | Pet-safe |
| Dainty Bess Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Dalmatian Cranesbill | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season; minimal in winter | Pet-safe |
| Dancing Lady Orchid | Bright indirect light (just back from a sunny window) | When the mix begins to dry, roughly every 4-6 days in growth | Pet-safe |
| Darcey Bussell Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; container plants more often | Pet-safe |
| Dark Beauty heather | Direct sun (at least 4-6 hours) | Weekly during the first season; as needed once established | 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 |
| Deer Grass | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; monthly or less in cool months | Pet-safe |
| Delta Pure White pansy | Bright indirect light (just back from a sunny window) | Every 2–3 days in warm weather; weekly in cool, wet conditions | Pet-safe |
| Dendrobium 'Berry Oda' | Bright indirect light (just back from a sunny window) | When the bark is nearly dry, roughly every 5-7 days in growth | Pet-safe |
| Dendrobium 'Emma White' | Bright indirect light (just back from a sunny window) | When the bark mix nears dry, roughly every 5-7 days in growth | Pet-safe |
| Dendrobium loddigesii | Bright indirect light (just back from a sunny window) | Frequently in growth, roughly every 4-6 days; sparingly through the winter rest | Pet-safe |
| Dendrobium orchid | Bright indirect light (just back from a sunny window) | When the bark approaches dryness, every 5-10 days in summer | 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 |
| 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 |
| 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 'Nikko' | Direct sun (at least 4-6 hours) | Weekly in the first season; during dry spells once established | 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 |
| 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 |
| Diana Rose of Sharon | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| 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 |
| 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 |
| Dog Rose | Direct sun (at least 4-6 hours) | Weekly during the first growing season; rarely once established | Pet-safe |
| Dolce Blackcurrant 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 |
| Don Juan Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, more in heat | Pet-safe |
| Dotted Blazing Star | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; moderate during first season | 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 Delight Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more 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 |
| Douglas's Sinningia | Bright indirect light (just back from a sunny window) | Allow top 2 cm to dry between waterings | Pet-safe |
| Dove's-Foot Cranesbill | Direct sun (at least 4-6 hours) | Low; water only during extended drought | Pet-safe |
| Downy Yellow Violet | Medium indirect light (a couple of metres from a window) | Regular; keep evenly moist | 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 |
| Drosera anglica | Direct sun (at least 4-6 hours) | Keep constantly saturated; stand in 1-3 cm of pure water through the growing season | Pet-safe |
| Drosera intermedia | Direct sun (at least 4-6 hours) | Keep permanently saturated; stand in 1-3 cm of pure water at all times during growth | Pet-safe |
| Druce's Cranesbill | Bright indirect light (just back from a sunny window) | Water during establishment; once established largely drought-tolerant | Pet-safe |
| Drummond's Aster | Medium indirect light (a couple of metres from a window) | Low to moderate | 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 ludoviciana | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days | 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 |
| Dryopteris uniformis | Low light (north window or shaded room) | Keep evenly moist; water deeply during dry spells, roughly weekly in summer | 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 Birch | Direct sun (at least 4-6 hours) | Regular moisture; do not allow to dry out, especially in summer | 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 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 Coast Redwood | Direct sun (at least 4-6 hours) | Every 1–2 weeks; more in summer heat | 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 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 |
| Eared Sage | Bright indirect light (just back from a sunny window) | Weekly in summer, less in winter | Pet-safe |
| Early Goldenrod | Direct sun (at least 4-6 hours) | Low to moderate — drought-tolerant once established | Pet-safe |
| East Himalayan Fir | Direct sun (at least 4-6 hours) | Regularly during establishment; drought-tolerant once mature | Pet-safe |
| Easter Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3cm of compost dries, roughly weekly in growth | 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 |
| Easter Orchid | Bright indirect light (just back from a sunny window) | When the bark dries, roughly every 5-7 days in growth | 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 |
| Eaton's Firecracker | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; minimal winter irrigation | 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 'Coconut Lime' | Direct sun (at least 4-6 hours) | Once or twice a week in the first year; once a week or less when fully established | 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 |
| Echinocereus rigidissimus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 12-16 days in growth; none in winter | Pet-safe |
| 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 |
| 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 |
| Eglantyne Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | Pet-safe |
| Eichhornia crassipes | Direct sun (at least 4-6 hours) | Free-floating on warm, still or slow water; keep the pond topped up | Pet-safe |
| Elegant clarkia | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | 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 |
| Elina Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Elk Blue Rush | Bright indirect light (just back from a sunny window) | Frequent to constant — keep soil consistently moist or wet | 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 |
| Encrusted Saxifrage | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; rarely in winter | Pet-safe |
| Encyclia tampensis | Bright indirect light (just back from a sunny window) | When roots and medium are nearly dry, about every 3-5 days in growth | 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 |
| Envy Green Zinnia | Direct sun (at least 4-6 hours) | When the top 2–4 cm of soil feels dry, roughly every 5–7 days | Pet-safe |
| Epidendrum ibaguense | Direct sun (at least 4-6 hours) | When the top of the medium feels nearly dry, roughly every 4-6 days in growth | Pet-safe |
| Episcia 'Cleopatra' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil begins to dry, roughly every 5-7 days | 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 'Pink Acajou' | 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 '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 |
| 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 |
| Europeana Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | 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 |
| Fairies' Thimbles | Bright indirect light (just back from a sunny window) | Weekly during active growth; less in winter | 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 |
| Falstaff Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season; more in heat or sandy soil | Pet-safe |
| Fama White scabiosa | Direct sun (at least 4-6 hours) | Every 7–10 days; less 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 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 |
| Felicia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during the growing season, more often in hot weather | Pet-safe |
| Fennel-Leaved Sea Lavender | Direct sun (at least 4-6 hours) | Low to moderate — water to establish, then sparingly | 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 |
| Fiebrig's Crown Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days in spring and summer; every 4-6 weeks in autumn; minimal to none in winter | Pet-safe |
| Field 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 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| Flat Sea Holly | Direct sun (at least 4-6 hours) | Low — water occasionally during the first growing season, then minimal | Pet-safe |
| Floating Bur-reed | Direct sun (at least 4-6 hours) | Fully aquatic; floating or lightly rooted in 10–80 cm of water | Pet-safe |
| Florist's Gloxinia | Bright indirect light (just back from a sunny window) | Keep evenly moist during active growth; typically water once the top of the mix begins to dry, then taper off completely heading into dormancy. | Pet-safe |
| 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 |
| 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 |
| Forget-me-not | Medium indirect light (a couple of metres from a window) | Weekly watering | 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 |
| Forsythia Sage | Bright indirect light (just back from a sunny window) | Weekly during active growth | 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 |
| Four-angled cassiope | Bright indirect light (just back from a sunny window) | Regularly during the growing season; keep consistently moist but never waterlogged | Pet-safe |
| Four-stamen Tamarisk | Direct sun (at least 4-6 hours) | Moderate to low; drought-tolerant once established | Pet-safe |
| Fourth of July Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, more during heat | Pet-safe |
| Foxtail Orchid | Bright indirect light (just back from a sunny window) | When the bark approaches dryness, typically every 7-10 days | Pet-safe |
| Fragrant White Water Lily | Direct sun (at least 4-6 hours) | Permanently submerged aquatic — maintain water depth of 30–60 cm over the crown | Pet-safe |
| Frau Dagmar Hartopp Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant once settled | Pet-safe |
| Freesia | Direct sun (at least 4-6 hours) | Keep evenly moist while in growth; reduce to nothing once foliage yellows after flowering | Pet-safe |
| Freesia 'Pink Marble' | Direct sun (at least 4-6 hours) | Water regularly once shoots appear, roughly every 4-7 days, keeping soil moist but not wet | Pet-safe |
| Freesia 'Royal Blue' | Direct sun (at least 4-6 hours) | Water every 4-7 days during active growth, keeping the soil evenly moist but never waterlogged | Pet-safe |
| Freesia 'Yellow Passion' | Direct sun (at least 4-6 hours) | Water every 4-7 days while in growth, keeping soil moist but not soggy | Pet-safe |
| Freesia refracta | Direct sun (at least 4-6 hours) | Water every 5-7 days during winter-spring growth, keeping the soil just moist | Pet-safe |
| French 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 |
| 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 |
| 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 |
| Fuchsia | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of soil feel dry (often every few days in summer) | Pet-safe |
| Fuchsia 'Alice Hoffman' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost are dry, roughly every 7-10 days | Pet-safe |
| Fuchsia 'Annabel' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost are dry, roughly every 5-7 days in summer | Pet-safe |
| Fuchsia 'Beacon' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost are dry, roughly every 7-10 days in summer | Pet-safe |
| Fuchsia 'Brutus' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost are dry, roughly every 7-10 days | Pet-safe |
| Fuchsia '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 'Dollar Princess' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost feels dry, roughly every 5-7 days in summer | Pet-safe |
| Fuchsia 'Gartenmeister Bonstedt' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 3-5 days in warm weather | Pet-safe |
| Fuchsia 'Golden Marinka' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost is dry, roughly every 5-7 days in summer | Pet-safe |
| Fuchsia 'Lady Thumb' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost is dry, roughly every 5-7 days in active growth | Pet-safe |
| Fuchsia 'Marinka' | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost are dry, roughly every 5-7 days; daily checks in hot weather | Pet-safe |
| Fuchsia 'Mrs Popple' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil or compost is dry, roughly every 3-5 days during active growth | Pet-safe |
| Fuchsia 'Pink Marshmallow' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of compost feel dry, roughly every 5-7 days; more frequently in summer heat | Pet-safe |
| Fuchsia 'Red Spider' | 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 '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 |
| Fuchsia 'Thalia' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 3-5 days in warm weather | Pet-safe |
| Fuchsia 'Tom Thumb' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil or compost feels dry, roughly every 5-8 days | Pet-safe |
| Fuchsia 'Voodoo' | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost are dry, roughly every 5-7 days in summer | Pet-safe |
| Fuchsia 'Winston Churchill' | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost are dry, roughly every 6-8 days | Pet-safe |
| Fuchsia magellanica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 3-5 days in summer heat | Pet-safe |
| 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 |
| Furzey Darley Dale heath | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Garden Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7-10 days in active growth; reduce to every 3-4 weeks in winter | Pet-safe |
| Garden Phlox 'David' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days | 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 |
| Gentian Sage | Direct sun (at least 4-6 hours) | Moderate; water when the top 2–3 cm of soil dries out | 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 |
| Gerbera Daisy | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (1 in) of soil is dry, roughly 1-2 times per week in active growth | Pet-safe |
| German Empress Orchid Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 7-10 days in growth | Pet-safe |
| 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 |
| Giant Arrowhead | Direct sun (at least 4-6 hours) | Permanently aquatic — plant in still or slow-moving water 10–15 cm (4–6 in) deep; tolerates up to 30 cm (12 in). | Pet-safe |
| Giant Bellflower | Medium indirect light (a couple of metres from a window) | Regularly — keep soil consistently moist throughout the growing season | 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 Sacaton | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent during establishment | Pet-safe |
| Giant Sea Holly | Direct sun (at least 4-6 hours) | Moderate — water regularly to keep soil evenly moist, especially in summer | 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 |
| 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 |
| 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 |
| Gloxinia perennis | 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 |
| Gloxinia sylvatica | 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 |
| Gmelin's Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Pet-safe |
| Gnome Spruce | Direct sun (at least 4-6 hours) | Every 5-7 days; water when the surface of the small root zone dries | 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 |
| Gold Charm Holiday Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| Gold Dew Tufted Hair Grass | Bright indirect light (just back from a sunny window) | Moderate to frequent — prefers consistently moist soil | 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 |
| Gold Mound Spirea | Direct sun (at least 4-6 hours) | Weekly when establishing; every 1–2 weeks once established | Pet-safe |
| Gold Rush Dawn Redwood | Direct sun (at least 4-6 hours) | Regularly — keep soil consistently moist, especially in summer | Pet-safe |
| Golden Alexanders | Bright indirect light (just back from a sunny window) | Weekly or as needed to keep soil moist | Pet-safe |
| Golden Ash | Direct sun (at least 4-6 hours) | Moderate; regular deep watering when establishing | Pet-safe |
| Golden Ball Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 7-10 days in summer; minimal in winter | Pet-safe |
| Golden Bow Dendrobium | Bright indirect light (just back from a sunny window) | Plentiful in warm summer growth; markedly reduced and near-dry over a cool winter rest | Pet-safe |
| Golden Cinquefoil | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | 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 Rat Tail Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer and every 3-4 weeks in winter | Pet-safe |
| Golden Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–4 weeks when established; very little 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 |
| Goldfish Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-10 days in growth | Pet-safe |
| Goldtau Hair Grass | Medium indirect light (a couple of metres from a window) | Every 5-10 days; keep consistently moist | 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 |
| Graceful Cattail | Direct sun (at least 4-6 hours) | Continuously moist to submerged | Pet-safe |
| Graham Thomas Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Grand Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7-14 days in growth; monthly in winter | Pet-safe |
| Grand Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once mature | 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'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 |
| Grayleaf Cranesbill | Direct sun (at least 4-6 hours) | Every 7–10 days when dry; very sparingly in winter | Pet-safe |
| Great Pond Sedge | Direct sun (at least 4-6 hours) | Permanently wet; grows in standing water or waterlogged soil | 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 Duckweed | Direct sun (at least 4-6 hours) | Permanently floating on water surface | Pet-safe |
| Greater Fringed Gentian | Bright indirect light (just back from a sunny window) | Regular — consistently moist | Pet-safe |
| Greater Knapweed | Direct sun (at least 4-6 hours) | Rarely needed once established; water new plants occasionally through their first summer | 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 |
| Greater Woodrush | Low light (north window or shaded room) | Weekly in first season, then largely self-sufficient | Pet-safe |
| Greek Fir | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; rarely needed once mature | Pet-safe |
| Greek Jancaea | Medium indirect light (a couple of metres from a window) | Little and often to keep root zone moist; almost dry during winter dormancy | Pet-safe |
| Green Ash | Direct sun (at least 4-6 hours) | Weekly when establishing; drought-tolerant 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-Flowered Galtonia | Direct sun (at least 4-6 hours) | Regular from spring through late summer; reduce in autumn | Pet-safe |
| Greenspire Linden | Direct sun (at least 4-6 hours) | Moderate; deep watering during establishment and drought | Pet-safe |
| Greenstem Forsythia | Direct sun (at least 4-6 hours) | Weekly while establishing, then drought-tolerant | Pet-safe |
| Grefsheim Spirea | Direct sun (at least 4-6 hours) | Weekly until established; reduce to occasional watering in drought | Pet-safe |
| Grey Club-rush | Direct sun (at least 4-6 hours) | Shallow to moderately deep aquatic; 10–60 cm over the crown | Pet-safe |
| Grey 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 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 |
| Guatemalan Blue Sage | Medium indirect light (a couple of metres from a window) | Every 5-7 days during the growing season | 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 Rock Jasmine | Direct sun (at least 4-6 hours) | Sparingly; dry conditions preferred especially in winter | Pet-safe |
| Hairy Sinningia | Bright indirect light (just back from a sunny window) | Weekly during growth; withheld during dormancy | Pet-safe |
| Hairy Violet | Medium indirect light (a couple of metres from a window) | Water moderately; allow the top centimetre of soil to dry between waterings. | Pet-safe |
| Hairy Woodrush | Low light (north window or shaded room) | Every 7–10 days during the growing season | Pet-safe |
| Hairy-fruited Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; very little in winter | 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 |
| 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 |
| Hansa Rose | Direct sun (at least 4-6 hours) | Water weekly while establishing; drought-tolerant once settled | Pet-safe |
| Hard Rush | Direct sun (at least 4-6 hours) | Consistently moist to saturated soil; tolerates standing water to 7 cm (3 in) deep | 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 |
| Harlow Carr Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat or pots | Pet-safe |
| Hatschbach's Fuchsia | Bright indirect light (just back from a sunny window) | Water freely in growth; keep just moist in winter | Pet-safe |
| Haygarth's Cape Primrose | Bright indirect light (just back from a sunny window) | Every 7-10 days in growth; every 3-4 weeks in winter | Pet-safe |
| Heart-leaved Globe Daisy | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; very sparingly in winter | 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 |
| 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 |
| Hedgehog Cactus | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in summer; keep dry in winter | Pet-safe |
| 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 'Lemon Queen' | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Helianthus × multiflorus 'Loddon Gold' | Direct sun (at least 4-6 hours) | About once or twice a week, keeping soil moist in summer | Pet-safe |
| Helianthus decapetalus 'Flore Pleno' | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Helianthus salicifolius | Direct sun (at least 4-6 hours) | Water when the top 3-4 cm of soil is dry, roughly every 7-10 days; drought-tolerant once established | Pet-safe |
| 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 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 |
| Herrenhausen Oregano | Direct sun (at least 4-6 hours) | Every 10–14 days when established; more frequently for young plants | Pet-safe |
| Heuchera 'Green Spice' | 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 '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 'Key Lime Pie' | 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 'Mahogany' | 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 'Miracle' | 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 'Peach Flambe' | 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 |
| Heuchera 'Quicksilver' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Heuchera 'Raspberry Ice' | 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 'Rave On' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season | Pet-safe |
| Heuchera villosa 'Autumn Bride' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Heucherella 'Tapestry' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, about every 5-7 days in summer | 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 |
| Hibiscus | Direct sun (at least 4-6 hours) | Deep watering every 5-7 days, more in heat | 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 |
| Himalayan Inula | Bright indirect light (just back from a sunny window) | 2-3 times per week; maintain consistent moisture | Pet-safe |
| Hoary Plantain | Direct sun (at least 4-6 hours) | Rarely; established plants are drought-tolerant | Pet-safe |
| Hoary Stock | Direct sun (at least 4-6 hours) | Weekly, allowing soil to dry slightly between waterings | 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 |
| Hollyhock | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce in autumn and winter | Pet-safe |
| Honeysuckle Fuchsia | Bright indirect light (just back from a sunny window) | Daily in active growth; less in winter | Pet-safe |
| Hooded Dendrobium | Bright indirect light (just back from a sunny window) | Abundant in summer growth; nearly withheld over the deciduous winter rest | Pet-safe |
| Hooker's Inula | Bright indirect light (just back from a sunny window) | 2 times per week; tolerates periodic damp conditions | Pet-safe |
| Hooker's Orchid Cactus | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, approximately every 7-14 days in spring and summer; reduce to once every 3-4 weeks in autumn and winter | Pet-safe |
| Hoop Pine | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Horned violet | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep evenly moist | 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 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 '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 |
| 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 |
| Iberian Cranesbill | Bright indirect light (just back from a sunny window) | Weekly in spring and summer; occasional in autumn | 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 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 |
| Impatiens | Medium indirect light (a couple of metres from a window) | Twice-weekly watering | 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 |
| Impatiens hawkeri 'SunPatiens Compact Hot Coral' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in full sun during summer | Pet-safe |
| Impatiens hawkeri 'SunPatiens Spreading White' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in full sun and in baskets | Pet-safe |
| Impatiens walleriana 'Xtreme Salmon' | Low light (north window or shaded room) | When the top 1-2 cm of soil begins to dry, often every 1-3 days in summer | Pet-safe |
| Indian Blanket | Direct sun (at least 4-6 hours) | Every 1–2 weeks; drought-tolerant once established | 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 Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days in spring and summer; every 3-4 weeks in autumn; minimal in winter | Pet-safe |
| Indian Head Notocactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in the active growing season; reduce to once every 5-8 weeks in winter | Pet-safe |
| Indian 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 |
| Intergeneric Aliceara 'Pacific Sabre' | Bright indirect light (just back from a sunny window) | Water thoroughly when the top of the bark approaches dryness, typically every 5-7 days | Pet-safe |
| Intrigue Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times weekly, about 4-5 litres per plant | Pet-safe |
| Irish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Italian aster | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; drought-tolerant in summer | Pet-safe |
| Ivan Cranesbill | Medium indirect light (a couple of metres from a window) | Once or twice a week in dry spells; less in cooler or wetter periods | Pet-safe |
| Ivory Sea Holly | Direct sun (at least 4-6 hours) | Moderate — water regularly during the growing season; reduce in winter | Pet-safe |
| Ivy-leaved Duckweed | Medium indirect light (a couple of metres from a window) | Permanently submerged | 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 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 Cornel Dogwood | Direct sun (at least 4-6 hours) | Regular watering while establishing; drought-tolerant once mature | 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 Sage | Medium indirect light (a couple of metres from a window) | Regular during growing season; reduce in winter | 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 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 |
| Jasmine (Pink Jasmine) | Bright indirect light (just back from a sunny window) | When the top 2-3cm of soil feels dry, roughly weekly in growth | Pet-safe |
| Jasminum beesianum | Direct sun (at least 4-6 hours) | Keep evenly moist while establishing; water in prolonged dry spells once mature | Pet-safe |
| Jasminum mesnyi | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Jasminum nudiflorum | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry out, about every 7-10 days while establishing | Pet-safe |
| Jasminum sambac 'Grand Duke of Tuscany' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days in growth | Pet-safe |
| Jasminum sambac 'Maid of Orleans' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days in warm growth | Pet-safe |
| Jeddeloh Hemlock | Bright indirect light (just back from a sunny window) | Regular — do not allow to dry out | 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 |
| Jubilee Celebration Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Julia Child Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Jungfrau Saxifrage | Bright indirect light (just back from a sunny window) | Water moderately; allow soil to partially dry between waterings and reduce in winter. | Pet-safe |
| Jungle Geranium | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil feels dry, roughly 1-2 times per week in growth | Pet-safe |
| Juniper-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 |
| Just Joey Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while in growth | 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 |
| 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 |
| Katz Sakura stock | Direct sun (at least 4-6 hours) | Every 3–5 days; keep soil evenly moist but never waterlogged | 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 |
| Kiftsgate Rose | Direct sun (at least 4-6 hours) | Deep weekly soak while establishing; little needed once mature | Pet-safe |
| King Ferdinand's Saxifrage | Bright indirect light (just back from a sunny window) | Low — water moderately in active growth; reduce sharply in summer dormancy and winter | Pet-safe |
| King 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 |
| Knock Out Rose | Direct sun (at least 4-6 hours) | About 2.5 cm of water weekly, deep soak | 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 |
| Kohleria | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 5-7 days in growth | Pet-safe |
| Kohleria 'Dark Velvet' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Kohleria 'Hannah Roberts' | 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 |
| Kohleria amabilis | 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 |
| Kohleria digitaliflora | 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 |
| 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 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 |
| Kousa Dogwood | Bright indirect light (just back from a sunny window) | Weekly deep watering while establishing | Pet-safe |
| Labrador violet | Medium indirect light (a couple of metres from a window) | Every 5–7 days; keep consistently moist | Pet-safe |
| Lace Flower Vine | 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 |
| Lady of Shalott Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season; more in heat or sandy soil | Pet-safe |
| Lady of the Night | Bright indirect light (just back from a sunny window) | When fully dry, roughly every 7-10 days | Pet-safe |
| Ladybird Scarlet cosmos | Direct sun (at least 4-6 hours) | Weekly; allow soil surface to dry between waterings | 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 |
| 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-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 Houseleek | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in prolonged dry periods | Pet-safe |
| Large-Flowered Kohleria | Bright indirect light (just back from a sunny window) | When top 2 in (5 cm) are dry during the growing season; very sparingly in winter dormancy | Pet-safe |
| Large-Flowered Petrocosmea | Medium indirect light (a couple of metres from a window) | Every 7–10 days in growth; sparingly in winter | Pet-safe |
| 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 |
| Lavaglut Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week, more in heat | 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 |
| 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 |
| Lesser Pond Sedge | Direct sun (at least 4-6 hours) | Permanently wet; waterlogged soil or up to 20 cm of standing water | Pet-safe |
| Lesser Quaking Grass | Direct sun (at least 4-6 hours) | Water sparingly; keep soil evenly moist during germination and establishment | Pet-safe |
| Lesser Silver Saxifrage | Direct sun (at least 4-6 hours) | Low — water only when the top layer of grit is dry | Pet-safe |
| Lesser Water Plantain | Direct sun (at least 4-6 hours) | Saturated to 10 cm depth of water | 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 |
| Licorice plant | Bright indirect light (just back from a sunny window) | Every 7–14 days; allow top 2–3 cm to dry | Pet-safe |
| Lifelong Saxifrage | Bright indirect light (just back from a sunny window) | Water moderately; allow the top 2–3 cm of soil to dry before watering. | Pet-safe |
| Lilac Sage | Bright indirect light (just back from a sunny window) | Water when the top 5 cm of soil is dry | Pet-safe |
| Lily Magnolia | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduce in autumn and winter | Pet-safe |
| Lime Rickey 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 |
| Limestone Saxifrage | Direct sun (at least 4-6 hours) | Low — water sparingly, allow soil to approach dryness between waterings | 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 |
| Lipstick Plant 'Mona Lisa' | 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 |
| Liriodendron tulipifera | Direct sun (at least 4-6 hours) | Deep soak weekly in the first two or three growing seasons, then rely on rainfall | Pet-safe |
| Little 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 Magnolia | Direct sun (at least 4-6 hours) | Weekly while establishing (1–3 years); deep watering in summer drought thereafter | Pet-safe |
| Little Gem Spruce | Direct sun (at least 4-6 hours) | Every 5-7 days; keep the small root zone evenly moist, watering when the surface dries | 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 |
| Lobb's Bulbophyllum | Medium indirect light (a couple of metres from a window) | Keep evenly moist in growth; water every 3-5 days | Pet-safe |
| Lobed Tickseed | Bright indirect light (just back from a sunny window) | Low to moderate; drought-tolerant but benefits from occasional watering | Pet-safe |
| Lobivia famatimensis | Direct sun (at least 4-6 hours) | Water thoroughly when the mix dries out, roughly every 1-2 weeks in summer; keep dry through winter | Pet-safe |
| Loblolly Pine Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, commonly daily in summer and every 3-5 days in cool weather | Pet-safe |
| Lobster Flower | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; monthly or less in winter | 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-leaved speedwell | Direct sun (at least 4-6 hours) | Weekly during the growing season; reduce in winter | Pet-safe |
| Long-Spurred Violet | Medium indirect light (a couple of metres from a window) | Regular; keep soil evenly moist | Pet-safe |
| Long-Stalked Cranesbill | Direct sun (at least 4-6 hours) | Low; tolerates extended dry periods | Pet-safe |
| Long-stamen Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Long-stamened Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries out, roughly every 5-8 days in summer | Pet-safe |
| Longleaf Phlox | Direct sun (at least 4-6 hours) | Every 14–21 days when establishing; minimal supplemental water once established | 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 |
| 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 |
| Lungwort 'Mrs Moon' | Medium indirect light (a couple of metres from a window) | Every 5-7 days in the growing season; keep soil moist but not waterlogged | Pet-safe |
| Lycaste aromatica | Bright indirect light (just back from a sunny window) | Every 4-6 days while in leaf; sparingly once leaves drop | 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 |
| Mackay's Zygopetalum | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is nearly dry, roughly every 5-7 days | Pet-safe |
| Madagascar Jasmine | Bright indirect light (just back from a sunny window) | When the top 2-3cm of soil starts to dry (spring-summer); sparingly in winter | Pet-safe |
| 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 |
| 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 |
| Magnificent Inula | Bright indirect light (just back from a sunny window) | 2-3 times per week; tolerates moist to wet conditions | Pet-safe |
| Magnolia 'Elizabeth' | Direct sun (at least 4-6 hours) | Weekly during the first few years and in summer droughts | Pet-safe |
| Magnolia 'Jane' | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the first two years, then during dry spells | Pet-safe |
| Magnolia 'Susan' | Direct sun (at least 4-6 hours) | Keep moist while establishing; water deeply weekly in dry spells for the first few years | Pet-safe |
| Magnolia grandiflora 'Gallissonnière' | Direct sun (at least 4-6 hours) | Weekly deep watering in the first 2-3 years, then only during prolonged dry spells | Pet-safe |
| Magnolia wilsonii | Bright indirect light (just back from a sunny window) | Weekly while establishing and during dry summer spells | Pet-safe |
| Mahonia aquifolium Apollo | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly through the first year then occasionally | Pet-safe |
| Mahonia Charity | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly to establish then chiefly during droughts | Pet-safe |
| Mahonia Pinnacle | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, weekly through the first year then occasionally | Pet-safe |
| Mahonia 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 |
| 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 |
| Manna Ash | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Many-Coloured Zygopetalum | Bright indirect light (just back from a sunny window) | When the surface is approaching dry, roughly every 4-6 days; more often if mounted | Pet-safe |
| many-flowered cape primrose | Medium indirect light (a couple of metres from a window) | Every 10–14 days; allow soil to dry between waterings | Pet-safe |
| Many-Flowered Rush | Direct sun (at least 4-6 hours) | Frequent to constant — prefers permanently moist to wet soil | Pet-safe |
| Many-haired Draba | Direct sun (at least 4-6 hours) | Every 10–14 days during growth; almost dry in winter | 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 |
| Marginata Wood Rush | Medium indirect light (a couple of metres from a window) | Low to moderate; water during dry spells in the first growing season, then minimal supplemental water needed | Pet-safe |
| Margined Saxifrage | Bright indirect light (just back from a sunny window) | Every 7–10 days when growing; very sparingly in winter | Pet-safe |
| 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 |
| Masters' Larch | Direct sun (at least 4-6 hours) | Weekly during first 2 years; monthly once established | Pet-safe |
| Matsumoto Mix aster | Direct sun (at least 4-6 hours) | 2–3 times per week in warm weather; reduce in cool or overcast periods | Pet-safe |
| Matted Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks; very sparingly in winter | Pet-safe |
| Matthiola incana 'Giant Imperial Mix' | Direct sun (at least 4-6 hours) | Keep evenly moist; water every 3-5 days, adjusting to weather | 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 | Medium indirect light (a couple of metres from a window) | When the top of the mix begins to dry, roughly every 5-7 days | Pet-safe |
| Maxillaria tenuifolia | Bright indirect light (just back from a sunny window) | When the medium is approaching dryness, roughly every 4-6 days in growth | Pet-safe |
| Maxillaria variabilis | Bright indirect light (just back from a sunny window) | When the medium nears dryness, about every 4-6 days in growth | Pet-safe |
| 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 |
| 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 |
| Meadow Saxifrage | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring; minimal watering needed from midsummer onward | Pet-safe |
| 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 feather grass | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; minimal in winter | Pet-safe |
| Mediterranean Sea Holly | Direct sun (at least 4-6 hours) | Low — water young plants to establish, then rely on rainfall | 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 |
| 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 Orange Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries out, roughly every 5-8 days during the growing season | Pet-safe |
| Mexican Sage | Direct sun (at least 4-6 hours) | Weekly during active growth | 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 |
| Midas Touch Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | 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 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 |
| Million Bells 'Superbells' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry — let it dry slightly between waterings | Pet-safe |
| Miltonia Orchid | Bright indirect light (just back from a sunny window) | Every 2-5 days in active growth; let medium approach dryness, never bone-dry | Pet-safe |
| Miltoniopsis 'Augres' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; usually every 4-6 days | Pet-safe |
| Miltoniopsis 'Herralexandre' | Medium indirect light (a couple of metres from a window) | When the mix surface starts to dry, roughly every 4-6 days | Pet-safe |
| Miltoniopsis 'Red Tide' | Medium indirect light (a couple of metres from a window) | Keep the mix evenly moist; typically every 4-6 days | Pet-safe |
| Miltoniopsis phalaenopsis | Medium indirect light (a couple of metres from a window) | Every 3-5 days, keeping the mix lightly moist at all times | Pet-safe |
| Miltoniopsis roezlii | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water every 3-5 days, never letting the mix fully dry | Pet-safe |
| Min Fir | Direct sun (at least 4-6 hours) | Regularly during establishment; moderate thereafter | Pet-safe |
| Mini Moth Orchid 'Sogo Vivien' | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days, when the bark mix is nearly dry and roots turn silvery-grey | Pet-safe |
| Miniature Sinningia | Bright indirect light (just back from a sunny window) | Keep evenly, lightly moist at all times; check every few days | 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 |
| Mister Lincoln Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Modest Cape Primrose | Medium indirect light (a couple of metres from a window) | Every 7-10 days in growth; every 3-4 weeks in winter | Pet-safe |
| Modoc Cypress | Direct sun (at least 4-6 hours) | Minimal once established; drought-tolerant | Pet-safe |
| Momi Fir | Direct sun (at least 4-6 hours) | Moderate; water regularly during establishment | Pet-safe |
| Monarch Birch | Direct sun (at least 4-6 hours) | Regular watering for first 2–3 years; moderate once established | Pet-safe |
| Mongolian Linden | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks in dry summers | 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 |
| 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 |
| 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 |
| Moorcroft's Sage | Direct sun (at least 4-6 hours) | Moderate during growth; minimal in winter | 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 |
| Mosquito Plant | Direct sun (at least 4-6 hours) | Every 7–14 days once established; more frequent when young | Pet-safe |
| Moss Campion | Direct sun (at least 4-6 hours) | Sparingly in summer; almost none in winter | Pet-safe |
| Moss Phlox | Direct sun (at least 4-6 hours) | Moderate — water during establishment and dry spells | Pet-safe |
| Mossy cassiope | Bright indirect light (just back from a sunny window) | Consistently moist; never allow soil to dry out | Pet-safe |
| Mossy Saxifrage | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce in summer heat and winter | Pet-safe |
| Moth orchid | Bright indirect light (just back from a sunny window) | Roughly weekly; let the bark approach dryness first | Pet-safe |
| Moth Orchid | Bright indirect light (just back from a sunny window) | When the bark mix is nearly dry, typically every 7-10 days | 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 Pansy | Bright indirect light (just back from a sunny window) | Water sparingly; allow soil to partially dry between waterings. | 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 |
| 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 Sage | Direct sun (at least 4-6 hours) | Low; drought tolerant once established | Pet-safe |
| Mule-Ear Oncidium | Bright indirect light (just back from a sunny window) | When roots approach dry, about every 4-6 days year-round | Pet-safe |
| Munstead Wood Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Muscari 'White Magic' | Direct sun (at least 4-6 hours) | Rainfall in most settings; water in dry spring spells | Pet-safe |
| Muscari armeniacum | Direct sun (at least 4-6 hours) | Rainfall in most settings; water in dry spring spells | Pet-safe |
| 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 |
| Namaqualand Sage | Direct sun (at least 4-6 hours) | Low; sparingly 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 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 Gentian | Bright indirect light (just back from a sunny window) | Moderate; allow the top centimetre of soil to dry between waterings | Pet-safe |
| Nasturtium | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Nathalie's Ramonda | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season; minimal in winter | Pet-safe |
| Nearly Wild Rose | Direct sun (at least 4-6 hours) | Deeply once a week, more in heat | Pet-safe |
| Nematanthus 'Cheerio' | 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 |
| Nematanthus 'Freckles' | 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 |
| Nematanthus 'Tropicana' | 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 |
| Nematanthus wettsteinii | 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 |
| 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 |
| Nerved Catmint | Direct sun (at least 4-6 hours) | Every 7–10 days in the growing season; much less in winter | Pet-safe |
| Nettle-leaved Bellflower | Medium indirect light (a couple of metres from a window) | Moderate — keep consistently moist, especially in summer | 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 | Direct sun (at least 4-6 hours) | Keep soil evenly moist; water weekly, more in heat | 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 Tree Fuchsia | Bright indirect light (just back from a sunny window) | Regular — consistent moisture | 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 |
| Night-Blooming Cereus | Bright indirect light (just back from a sunny window) | When the top few cm of mix is dry, roughly every 1-2 weeks in growth | Pet-safe |
| Night-scented stock | Direct sun (at least 4-6 hours) | Every 7–10 days; allow soil to dry between waterings | 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 |
| Nobile Dendrobium | Bright indirect light (just back from a sunny window) | Frequently in spring-summer growth, then sharply reduced over the cool winter rest | Pet-safe |
| Noble Cape Primrose | Bright indirect light (just back from a sunny window) | every 5–9 days in active growth, every 14 days in winter | Pet-safe |
| Noble Cymbidium | Bright indirect light (just back from a sunny window) | Keep lightly and evenly moist, about every 5-7 days, reduced in winter | Pet-safe |
| Noble 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 |
| Northwind Switchgrass | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks when mature | 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 |
| Odontoglossum crispum | Bright indirect light (just back from a sunny window) | Keep evenly moist year-round, watering roughly every 3-5 days so the mix never fully dries | Pet-safe |
| Ohio Goldenrod | Direct sun (at least 4-6 hours) | Moderate to high — keep soil consistently moist | Pet-safe |
| Oklahoma Salmon zinnia | Direct sun (at least 4-6 hours) | Every 3–5 days; adjust for rainfall and temperature | 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 |
| Oliver's impatiens | Medium indirect light (a couple of metres from a window) | Every 4–7 days; moderate and consistent | Pet-safe |
| Olivia Rose Austin | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Olympiad Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Oncidium ornithorhynchum | Bright indirect light (just back from a sunny window) | Every 4-6 days in growth, as the mix nears dryness | Pet-safe |
| Oncidium sphacelatum | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth, when the mix approaches dryness | Pet-safe |
| Orange 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 sinningia | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; stop completely during winter dormancy | Pet-safe |
| Orange Snow Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 7-10 days in spring and summer; every 4-6 weeks in autumn; none or barely any in winter | Pet-safe |
| Orange Stonecrop | Direct sun (at least 4-6 hours) | Every 10-14 days when establishing; virtually rain-fed once mature | Pet-safe |
| Orchid | Bright indirect light (just back from a sunny window) | Once a week — soak the medium thoroughly, then drain | Pet-safe |
| Orchid Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| 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 |
| 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 |
| 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 |
| 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 |
| Overdam Feather Reed Grass | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks once established | Pet-safe |
| Overdam Variegated Feather Reed Grass | Direct sun (at least 4-6 hours) | When the top few centimetres of soil dry, about weekly; tolerates occasionally damp soil | 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 Silver Fir | Bright indirect light (just back from a sunny window) | Regularly during establishment; relies on natural rainfall when mature | 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 |
| Palace Purple coral bells | Medium indirect light (a couple of metres from a window) | Once or twice per week in growing season; reduce 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 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 |
| Palmetto Sedge | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 5-8 days | Pet-safe |
| Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; thereafter only in prolonged drought | Pet-safe |
| Pansy | Direct sun (at least 4-6 hours) | Twice-weekly watering | Pet-safe |
| Pansy Orchid | Bright indirect light (just back from a sunny window) | Every 3-5 days; up to 2-3 times weekly in warm, dry spells | Pet-safe |
| Pansy Orchid | Medium indirect light (a couple of metres from a window) | When the surface of the mix begins to dry, roughly every 4-6 days | Pet-safe |
| Paper 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 |
| Paphiopedilum 'Pinocchio' | Medium indirect light (a couple of metres from a window) | Every 4-7 days; keep evenly moist | Pet-safe |
| Paphiopedilum bellatulum | Medium indirect light (a couple of metres from a window) | Every 5-8 days; keep lightly moist, never waterlogged | Pet-safe |
| Paphiopedilum malipoense | Medium indirect light (a couple of metres from a window) | Every 4-7 days; keep evenly moist, never bone-dry | Pet-safe |
| Paphiopedilum venustum | Medium indirect light (a couple of metres from a window) | Every 4-7 days; keep evenly moist | Pet-safe |
| Parrot Pitcher Plant | Direct sun (at least 4-6 hours) | Keep permanently wet, standing in 1-3 cm of water (tray method); it tolerates brief flooding well | Pet-safe |
| 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 |
| Path Rush | Direct sun (at least 4-6 hours) | Minimal supplemental watering needed once established; tolerates periodic flooding and 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 |
| Peace Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Pelotazo Mallow | Direct sun (at least 4-6 hours) | Every 10–21 days in summer; monthly or less in winter | 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 |
| Penelope Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | 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 |
| Penther's Cape Primrose | Bright indirect light (just back from a sunny window) | every 7–10 days during active growth, every 14–21 days in winter | Pet-safe |
| Perennial Candytuft | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | 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 |
| 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 |
| Persian Violet | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is just dry, roughly every 3-5 days | Pet-safe |
| Peruvian 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 |
| Petunia | Direct sun (at least 4-6 hours) | Even moisture — every 1-2 days for hanging baskets in heat | 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 'Tidal Wave Silver' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry; containers may need daily watering in summer | Pet-safe |
| Petunia 'Wave Purple' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, often daily in summer for baskets and containers | Pet-safe |
| 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 |
| Phalaenopsis 'Brother Sara Gold' | Bright indirect light (just back from a sunny window) | When the bark is nearly dry, typically every 7-10 days | Pet-safe |
| Phalaenopsis 'Liodoro' | Bright indirect light (just back from a sunny window) | About every 7-10 days, when the bark begins to dry and roots silver over | Pet-safe |
| Phalaenopsis-type Dendrobium | Bright indirect light (just back from a sunny window) | Regularly through warm active growth; reduced over a short, cooler, drier 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 'Living Fire' | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; water every 1-3 days, often standing the pot in a shallow tray of clean water | Pet-safe |
| Phragmipedium besseae | Bright indirect light (just back from a sunny window) | Keep constantly moist to wet; water every 1-3 days and many growers stand the pot in 1-2 cm of clean water | Pet-safe |
| Phragmipedium longifolium | Bright indirect light (just back from a sunny window) | Keep constantly moist; water every 1-3 days, often with the pot standing in a shallow tray of clean water | Pet-safe |
| Pigeon Orchid | Bright indirect light (just back from a sunny window) | Frequently in warm growth, allowing brief drying between waterings | Pet-safe |
| Pilalo Fuchsia | Bright indirect light (just back from a sunny window) | Freely in growth; reduce in winter | Pet-safe |
| Pincushion flower | Direct sun (at least 4-6 hours) | Once or twice weekly | 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 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 Moth Orchid | Bright indirect light (just back from a sunny window) | When the bark approaches dryness, typically every 7-10 days | 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 Penny Cranesbill | Bright indirect light (just back from a sunny window) | Water once or twice a week during dry periods; reduce in winter | 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 Rock Jasmine | Direct sun (at least 4-6 hours) | Very sparingly; driest in winter | Pet-safe |
| Pink Surprise calendula | Direct sun (at least 4-6 hours) | Every 5–7 days; reduce in cool, wet periods | 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 |
| 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 |
| Playboy Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | Pet-safe |
| Plum Pudding 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 |
| 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 |
| Point Reyes bearberry | Direct sun (at least 4-6 hours) | Low once established; water weekly for the first 1–2 seasons | 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 |
| Polystichum aculeatum | Low light (north window or shaded room) | Keep soil consistently moist; water every 5-7 days in dry spells once established | Pet-safe |
| Polystichum makinoi | Low light (north window or shaded room) | Keep evenly moist; water every 5-7 days during dry weather | 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 |
| Polystichum setiferum 'Plumosum Densum' | Low light (north window or shaded room) | Keep evenly moist; water deeply during dry spells, roughly weekly in summer | 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 |
| 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 Face | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry completely between waterings, roughly every 14-21 days during active growth | 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 |
| 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 |
| Princess Alexandra of Kent Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat or containers | 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 Speedwell | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | 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 |
| Purity cosmos | Direct sun (at least 4-6 hours) | Every 5–7 days; highly drought tolerant once established | 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 Dragon Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–10 days; water more frequently in hot, dry periods | Pet-safe |
| Purple Fountain Grass | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil dries, roughly weekly in the ground and more often in containers | Pet-safe |
| Purple Giant Hyssop | Bright indirect light (just back from a sunny window) | Every 5–7 days; tolerates periodic wet spells | 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 Poppy Mallow | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; deeply drought-tolerant | Pet-safe |
| Purple Saxifrage | Bright indirect light (just back from a sunny window) | Water sparingly; allow soil to nearly dry between waterings in summer. | Pet-safe |
| Purple Siberian Melic | Bright indirect light (just back from a sunny window) | Every 1–2 weeks during the growing season | Pet-safe |
| Purple Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more in active growth | 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 Water Lily | Direct sun (at least 4-6 hours) | Permanently aquatic — crown submerged 10–25 cm (4–10 in) below water surface | 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 |
| Pyrenean Saxifrage | Bright indirect light (just back from a sunny window) | Water sparingly; keep roots just moist in summer and very dry 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 |
| 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 Lime Red zinnia | Direct sun (at least 4-6 hours) | Regular; deep watering 2–3 times per week at soil level only | 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 | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Queeny Lime Orange zinnia | Direct sun (at least 4-6 hours) | Every 3–5 days in warm weather; reduce in cool spells | Pet-safe |
| Rainer's Bellflower | Direct sun (at least 4-6 hours) | Moderately during growth; sparingly in winter | Pet-safe |
| Rat Tail Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in spring and summer; reduce to every 3-4 weeks in winter | Pet-safe |
| 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 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 Orchid Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Red Osier Dogwood | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | 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 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-Topped Sage | Direct sun (at least 4-6 hours) | Water when the top 3 cm of soil feels dry | Pet-safe |
| Reed Sweet-grass | Direct sun (at least 4-6 hours) | Permanently wet; grows in standing water 15–45 cm deep | Pet-safe |
| Reed-stem orchid | Bright indirect light (just back from a sunny window) | Every 4-5 days in warm growth; about weekly when cool | Pet-safe |
| Regel's Sage | Direct sun (at least 4-6 hours) | Moderate; approximately 2.5 cm (1 inch) per week | Pet-safe |
| Reitz's sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; cease in dormancy | 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 |
| Rhipsalidopsis gaertneri | 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 |
| Rhyncholaeliocattleya 'Pastoral Innocence' | Bright indirect light (just back from a sunny window) | When the mix nears dry, roughly every 5-7 days in growth; reduced after flowering | Pet-safe |
| rice cutgrass | Bright indirect light (just back from a sunny window) | Constantly moist to permanently flooded; thrives in standing water at or just above soil level | Pet-safe |
| 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 |
| Ringed Sage | Direct sun (at least 4-6 hours) | Low to moderate; allow soil to dry between waterings | 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 |
| 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 |
| Roborowsky's Sage | Direct sun (at least 4-6 hours) | Moderate; keep soil evenly moist | 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 Jasmine | Direct sun (at least 4-6 hours) | Water moderately in spring and summer; reduce in autumn and winter | 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 |
| Rocket candytuft | Direct sun (at least 4-6 hours) | Every 7–14 days; keep moist during establishment, reduce once rooted | Pet-safe |
| Rocket Mix 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 |
| 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 |
| Rose | Direct sun (at least 4-6 hours) | Deep watering once a week, more in heat | Pet-safe |
| Rose campion | Direct sun (at least 4-6 hours) | Every 10–14 days; very drought-tolerant once established | Pet-safe |
| Rose Grass | Direct sun (at least 4-6 hours) | Moderate during growth; almost dry in winter dormancy | 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 |
| 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 |
| Rothschild's Bulbophyllum | Medium indirect light (a couple of metres from a window) | Keep evenly moist in growth; water every 3-5 days | Pet-safe |
| Rough Blazing Star | Direct sun (at least 4-6 hours) | Water to establish, then only during extended drought | Pet-safe |
| Rough Coneflower | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| Rough 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 |
| Round-leaved Sage | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth | 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 |
| Roundleaf Pickerelweed | Direct sun (at least 4-6 hours) | Permanently aquatic — plant in still or slow-moving water 5–20 cm (2–8 in) deep or in consistently waterlogged marginal soil. | Pet-safe |
| Royal Blue Aubrieta | Direct sun (at least 4-6 hours) | Weekly in spring and autumn; infrequently in summer | 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 |
| Rudbeckia 'Becky Mixed' | Direct sun (at least 4-6 hours) | Every 7-10 days once established; keep containers evenly moist | 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 |
| Rufa Fountain Bamboo | Bright indirect light (just back from a sunny window) | Regularly during the growing season, approximately every 5–7 days; keep soil consistently moist but not waterlogged | Pet-safe |
| Rugosa Rose | Direct sun (at least 4-6 hours) | weekly when establishing, monthly once established | Pet-safe |
| Running Tapestry Foamflower | Medium indirect light (a couple of metres from a window) | Every 5–7 days; more during summer drought | Pet-safe |
| 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 |
| Saintpaulia 'Buckeye Fanfare' | Bright indirect light (just back from a sunny window) | When the top of the mix is just dry, about every 5-7 days | Pet-safe |
| Saintpaulia 'Jolly Ellie' | Bright indirect light (just back from a sunny window) | When the surface of the mix is just dry, roughly every 5-7 days | Pet-safe |
| Saintpaulia 'Mac's Black Pearl' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil feels dry, roughly every 5-7 days | Pet-safe |
| Saintpaulia 'Ness' Dipity' | Bright indirect light (just back from a sunny window) | When the top of the mix is just dry to the touch, about every 5-7 days | Pet-safe |
| Saintpaulia 'Optimara Montana' | Bright indirect light (just back from a sunny window) | When the surface of the mix is just dry, roughly every 5-7 days | Pet-safe |
| Saintpaulia 'Powderpuff' | Bright indirect light (just back from a sunny window) | When the surface of the mix is just dry, roughly every 5-7 days | Pet-safe |
| Saintpaulia 'Rob's Boolaroo' | Bright indirect light (just back from a sunny window) | When the top of the mix feels just dry, typically every 5-7 days | Pet-safe |
| Saintpaulia 'Winter Lace' | Bright indirect light (just back from a sunny window) | When the top of the mix feels just dry, about every 5-7 days | Pet-safe |
| Sakhalin Fir | Direct sun (at least 4-6 hours) | Moderate; water regularly during establishment | Pet-safe |
| Salal | Low light (north window or shaded room) | Moderate; established plants are drought-tolerant but prefer moist conditions | Pet-safe |
| Sally Holmes Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | Pet-safe |
| Salmon Queen scabiosa | Direct sun (at least 4-6 hours) | Every 5–7 days in active growth; reduce in cool spells | Pet-safe |
| Salvia | Direct sun (at least 4-6 hours) | Weekly watering | 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 farinacea 'Evolution Violet' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days once established | Pet-safe |
| Salvia farinacea 'Strata' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 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 |
| San Diego Sage | Direct sun (at least 4-6 hours) | Low; drought tolerant once established | Pet-safe |
| Sand Bluestem | Direct sun (at least 4-6 hours) | Minimal — seasonal rainfall only in most settings | Pet-safe |
| Sand Couch Grass | Direct sun (at least 4-6 hours) | Rarely — established plants rely on rainfall and groundwater | 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 Reed | Direct sun (at least 4-6 hours) | Rarely — depends on deep soil moisture in sand | Pet-safe |
| Sand Sedge | Direct sun (at least 4-6 hours) | Very infrequent — drought-adapted | 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 |
| 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 menziesii | Direct sun (at least 4-6 hours) | Keep soil moist; water every 3-5 days in dry spells | 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 |
| Sarracenia 'Juthatip Soper' | Direct sun (at least 4-6 hours) | Keep permanently wet with the tray method, standing in 1-3 cm of water during the growing season | Pet-safe |
| Sarracenia × catesbaei | Direct sun (at least 4-6 hours) | Keep media constantly wet; stand the pot in 1-2 cm of water during the growing season | Pet-safe |
| Sarracenia × excellens | Direct sun (at least 4-6 hours) | Permanently moist; tray-water in 1-2 cm of pure water through the growing season | Pet-safe |
| Sarracenia leucophylla 'Tarnok' | Direct sun (at least 4-6 hours) | Keep constantly wet; stand in 1-2 cm of pure water during the growing season | Pet-safe |
| Sasanqua Camellia | Bright indirect light (just back from a sunny window) | Keep soil evenly moist; water deeply once or twice weekly in the growing season, more in heat | Pet-safe |
| Sasanqua Camellia 'Yuletide' | Bright indirect light (just back from a sunny window) | About weekly, more in summer heat; water when the top 3-5 cm of soil is dry | Pet-safe |
| 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 |
| 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 |
| Scarlet Ball Cactus | Direct sun (at least 4-6 hours) | When the mix is dry, about every 10-14 days in growth; sparingly in winter | Pet-safe |
| Scarlet Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 7-10 days in spring and summer; every 3-5 weeks in autumn; very sparingly in winter | Pet-safe |
| Scarlet Bidi-Bidi | Direct sun (at least 4-6 hours) | Fortnightly once established; drought-tolerant | 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 |
| Scepter'd Isle Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season; more in heat, sandy soil or containers | 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 |
| Schlumbergera × buckleyi | 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 |
| Sea Campion | Direct sun (at least 4-6 hours) | Every 1–2 weeks; 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 Stock | Direct sun (at least 4-6 hours) | Weekly during active growth (allow surface to dry slightly 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 |
| Seabeach Sandwort | Direct sun (at least 4-6 hours) | Infrequently — highly drought-tolerant once established | 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 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 |
| Selenicereus pteranthus | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-14 days in summer | Pet-safe |
| Sellow's Sinningia | Bright indirect light (just back from a sunny window) | Moderate during growth; none during dormancy | 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 |
| Sessile Bellwort | Medium indirect light (a couple of metres from a window) | Moderate; keep soil moist in spring and early summer. Tolerates periodic dryness once established. | Pet-safe |
| 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 |
| Sexy Rexy Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | Pet-safe |
| Shadscale Saltbush | Direct sun (at least 4-6 hours) | Every 3–5 weeks during establishment, then rainfall only | Pet-safe |
| Shady Sage | Bright indirect light (just back from a sunny window) | Allow soil to dry between waterings | 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 |
| Sharp-fruited Abutilon | Direct sun (at least 4-6 hours) | Every 7–10 days when young; fortnightly once established | 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 |
| Sheridan Spire Dawn Redwood | Direct sun (at least 4-6 hours) | Regularly — maintain consistently moist soil | 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 Pondweed | Direct sun (at least 4-6 hours) | Fully submerged — permanently aquatic; water is the growing medium, not an irrigation schedule | 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 |
| Shore Pine | Direct sun (at least 4-6 hours) | When the top 2-3 cm of the mix is dry, often daily in summer heat and every 3-5 days in cool weather | Pet-safe |
| Showy Border Forsythia | Direct sun (at least 4-6 hours) | Every 7-14 days during dry spells; very drought-tolerant once established | Pet-safe |
| Showy Cranesbill | Bright indirect light (just back from a sunny window) | Weekly during spring and summer; minimal in autumn and winter | Pet-safe |
| Showy Disocactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in spring and summer; reduce to every 3-4 weeks in 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 Sinningia | Bright indirect light (just back from a sunny window) | Keep soil slightly moist during growth; dry off in autumn | 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 |
| 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 Larch | Direct sun (at least 4-6 hours) | Weekly during establishment; low once established | Pet-safe |
| Siebold's Magnolia | Bright indirect light (just back from a sunny window) | Weekly throughout the growing season; reduce in winter | Pet-safe |
| Sikkim Larch | Direct sun (at least 4-6 hours) | Weekly during establishment, less once established | Pet-safe |
| Silky Aster | Direct sun (at least 4-6 hours) | Low — drought tolerant | 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 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 Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once established | Pet-safe |
| Silver Knight heather | Direct sun (at least 4-6 hours) | Weekly during establishment; moderate watering once established | 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 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 Vase Bromeliad | Bright indirect light (just back from a sunny window) | Keep the central cup filled with soft water; water potting medium only when it approaches dryness | 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 |
| 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 |
| Single-leaf Cape Primrose | Bright indirect light (just back from a sunny window) | every 7–10 days in the growing season, reduce to every 14–21 days in winter | Pet-safe |
| Sinningia 'Duchess of York' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth | Pet-safe |
| Sinningia 'Empress' | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of soil is dry, keeping the mix evenly moist during active growth | Pet-safe |
| Sinningia 'Li'l Georgie' | Bright indirect light (just back from a sunny window) | When the top 1 cm of soil is dry, about every 4-7 days | Pet-safe |
| Sinningia 'Prudence Risley' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in active growth | Pet-safe |
| Sinningia concinna | Bright indirect light (just back from a sunny window) | Keep evenly lightly moist while in growth, watering when the surface just dries, roughly every 5-8 days | Pet-safe |
| Sinningia eumorpha | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in active growth | Pet-safe |
| Sinningia tubiflora | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in active growth | Pet-safe |
| 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 |
| Skinners Achimenes | Bright indirect light (just back from a sunny window) | Consistently moist throughout the growing season; dry during winter dormancy | 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 |
| Skyracer Moor Grass | Direct sun (at least 4-6 hours) | Regular; maintain consistent moisture | 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 |
| Small Cape Primrose | Medium indirect light (a couple of metres from a window) | every 7–10 days in the growing season, every 14–21 days in winter | Pet-safe |
| Small-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 Cape Primrose | Medium indirect light (a couple of metres from a window) | Every 7-10 days in active growth; every 3 weeks in winter | Pet-safe |
| Small-Flowered Cranesbill | Bright indirect light (just back from a sunny window) | Low; water sparingly and only in drought | Pet-safe |
| Small-flowered Pickerelweed | Direct sun (at least 4-6 hours) | Continuously moist to submerged | Pet-safe |
| Small-leaved Fuchsia | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; every 14-21 days in winter | Pet-safe |
| Small's Beardtongue | Bright indirect light (just back from a sunny window) | Every 1–2 weeks; reduce in winter | 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 Cordgrass | Direct sun (at least 4-6 hours) | Continuous tidal immersion — lower intertidal zone | 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 |
| Snake Cactus | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Snake Orchid | Bright indirect light (just back from a sunny window) | Keep evenly moist, about every 4-6 days in growth, drier in winter | Pet-safe |
| Snapdragon | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Snapdragon 'Madame Butterfly' | Direct sun (at least 4-6 hours) | Keep evenly moist; water about twice a week, adjusting for heat, letting the top of the soil dry first | Pet-safe |
| Snapdragon 'Rocket' | Direct sun (at least 4-6 hours) | Keep evenly moist; water roughly twice a week, more in heat, letting the surface dry between | 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 |
| Snapdragon vine | Bright indirect light (just back from a sunny window) | Water when the top 2–3 cm of soil dries out, roughly every 5–7 days | Pet-safe |
| 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-in-Summer | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Pet-safe |
| Snowberry Heath | Medium indirect light (a couple of metres from a window) | Regularly; maintain consistently moist but not waterlogged soil | 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 |
| Snowy Woodrush | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season | Pet-safe |
| Soft-stem Bulrush | Direct sun (at least 4-6 hours) | Permanently aquatic or waterlogged; plant at 0–60 cm (0–24 in) water depth | Pet-safe |
| Sophy's Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; container plants checked more often | Pet-safe |
| Southern Cattail | Direct sun (at least 4-6 hours) | Continuously moist to submerged | Pet-safe |
| Southern Heath | Direct sun (at least 4-6 hours) | Water regularly but allow the soil surface to dry slightly between waterings | Pet-safe |
| Southern Japanese Hemlock | Bright indirect light (just back from a sunny window) | Weekly during the growing season; reduced in winter | Pet-safe |
| Southern Magnolia | Direct sun (at least 4-6 hours) | Deeply once a week for the first two seasons; established trees need water only in drought | Pet-safe |
| Southern Magnolia 'Little Gem' | Direct sun (at least 4-6 hours) | Weekly deep watering while establishing, then every 1-2 weeks in dry weather | Pet-safe |
| Souvenir de la Malmaison Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while establishing; mature plants when the top 5 cm of soil is dry | Pet-safe |
| Spanish 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 Stonecrop | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in very dry spells | Pet-safe |
| Spatulate Dendrobium | Bright indirect light (just back from a sunny window) | Regularly through warm growth; reduced over a cool, brighter winter rest | Pet-safe |
| Spike heath | Direct sun (at least 4-6 hours) | Low to moderate — once established, water only during prolonged drought | 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 Fuchsia | Direct sun (at least 4-6 hours) | Infrequent — allow soil to dry between waterings | 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 |
| 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 |
| 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 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 Bellflower | Direct sun (at least 4-6 hours) | Low — water only during prolonged dry spells | 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 Cream heather | Direct sun (at least 4-6 hours) | Weekly during establishment; less frequent 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 |
| 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 |
| 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 |
| 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 of Bethlehem Orchid | Bright indirect light (just back from a sunny window) | When the bark approaches dryness, roughly every 4-7 days | Pet-safe |
| Stardust Ice Plant | Direct sun (at least 4-6 hours) | Every 1–2 weeks during active growth; very sparingly in winter | 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 |
| Sterling Silver Linden | Direct sun (at least 4-6 hours) | Weekly during the first 2 years; monthly deep watering once established | Pet-safe |
| Stewartia monadelpha | Bright indirect light (just back from a sunny window) | Weekly; keep soil consistently moist but well-drained | Pet-safe |
| Stewartia pseudocamellia | Bright indirect light (just back from a sunny window) | Weekly; keep soil consistently moist but never waterlogged | Pet-safe |
| Stiff Goldenrod | Direct sun (at least 4-6 hours) | Highly drought-tolerant; water only in prolonged drought | Pet-safe |
| Stiff Sunflower | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | Pet-safe |
| 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 |
| Stock | Direct sun (at least 4-6 hours) | Every 5–7 days; keep evenly moist but not wet | 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 |
| 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 |
| Straw-red Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established; weekly for new plants | 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 'Bethan' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Black Panther' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Chorus Line' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Falling Stars' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Harlequin Blue' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days | Pet-safe |
| Streptocarpus 'Polka-Dot Purple' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Streptocarpus 'Purple Haze' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, about every 7-10 days | Pet-safe |
| Streptocarpus 'Targa' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, around every 7-10 days | Pet-safe |
| Streptocarpus caulescens | 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 |
| 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 |
| 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 |
| 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 |
| Sukhakul's Slipper Orchid | Medium indirect light (a couple of metres from a window) | When the surface of the mix starts to dry, roughly every 5-7 days | Pet-safe |
| 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 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 Flare Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | 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 |
| Sunflower | Direct sun (at least 4-6 hours) | Deep watering once a week | Pet-safe |
| Sunningdale Silver Pampas Grass | Direct sun (at least 4-6 hours) | Weekly while establishing; thereafter only in extended drought | Pet-safe |
| 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 Mango Nemesia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 4-6 days | Pet-safe |
| Sunsatia Plus Coconut Nemesia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil or compost is dry, roughly every 4-6 days | Pet-safe |
| Sunset Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days once established | Pet-safe |
| Supertunia 'Vista Bubblegum' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; daily in hot weather and containers | Pet-safe |
| Supertunia bubblegum petunia | Direct sun (at least 4-6 hours) | Every 2–4 days in containers in heat; every 5–7 days in borders | Pet-safe |
| Swamp Rose Mallow | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water every 3-5 days in summer or more frequently in containers | Pet-safe |
| Swamp Sunflower | Direct sun (at least 4-6 hours) | Consistently moist; water weekly or more in dry periods | Pet-safe |
| 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 Chariot Miniature Rose | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often every 1-3 days in baskets during summer | Pet-safe |
| Sweet sultan | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Sweet violet | Medium indirect light (a couple of metres from a window) | Every 5–7 days; keep evenly moist | 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 |
| Swiss Rock Jasmine | Direct sun (at least 4-6 hours) | Very sparingly year-round; almost dry in winter | 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 |
| Swordleaf Rush | Direct sun (at least 4-6 hours) | Consistently moist to wet soil; tolerates shallow standing water to 5 cm (2 in) | Pet-safe |
| Symphyotrichum laeve 'Bluebird' | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged dry spells once settled | Pet-safe |
| Symphyotrichum novae-angliae 'Andenken an Alma Pötschke' | Direct sun (at least 4-6 hours) | Keep soil consistently moist; water deeply in dry spells, roughly weekly | 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 |
| Tagetes erecta 'Inca Gold' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-4 days | Pet-safe |
| Tagetes erecta 'Taishan Orange' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-4 days | Pet-safe |
| Tagetes patula 'Boy Orange' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Tagetes patula 'Janie Bright Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-5 days | Pet-safe |
| Tagetes tenuifolia 'Tangerine Gem' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Pet-safe |
| 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 Mix pincushion flower | Direct sun (at least 4-6 hours) | Once or twice weekly | 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 |
| Teasing Georgia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Teddy Bear sunflower | Direct sun (at least 4-6 hours) | Weekly, or every 5–7 days during dry spells | Pet-safe |
| Tennessee Coneflower | Direct sun (at least 4-6 hours) | Water to establish, then only during extended drought | 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 Blazing Star | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; minimal once established | Pet-safe |
| Texas Sage | Direct sun (at least 4-6 hours) | Moderate — water once or twice weekly in the growing season | Pet-safe |
| Thanksgiving Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| 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 Dark Lady Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | 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 |
| The Generous Gardener Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more during establishment and in heat | Pet-safe |
| The Pilgrim Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat | Pet-safe |
| Therese Bugnet Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Thin-Leaved Sunflower | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks; keep moderately moist | Pet-safe |
| Thistle Sage | Direct sun (at least 4-6 hours) | Very infrequent — once established, monthly or less in summer | 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-Coloured Vanda | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days when cool and dim | Pet-safe |
| Thrift | Direct sun (at least 4-6 hours) | Every 7–14 days, allowing soil to dry between waterings | Pet-safe |
| Throatwort | Direct sun (at least 4-6 hours) | Every 4–6 days; water when the top 2 cm of soil begins to dry | 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-leaved Fuchsia | Medium indirect light (a couple of metres from a window) | Regular — keep soil evenly moist | 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 |
| Tiger Moth Orchid | Bright indirect light (just back from a sunny window) | When the bark is nearly dry, typically every 6-9 days | Pet-safe |
| 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 |
| Tiny Sea Lavender | Direct sun (at least 4-6 hours) | Low — water sparingly, allowing soil to dry completely between sessions | 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 |
| Toe toe | Direct sun (at least 4-6 hours) | Once or twice a week during establishment; monthly once established | Pet-safe |
| Tolumnia variegata | Bright indirect light (just back from a sunny window) | Daily to every other day when mounted; allow to dry fully between | Pet-safe |
| Tom Thumb Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, about every 7-10 days in summer; minimal in winter | Pet-safe |
| 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 |
| Toothed Fuchsia | Bright indirect light (just back from a sunny window) | Regular — keep evenly moist | Pet-safe |
| Toothwort | Medium indirect light (a couple of metres from a window) | 2–3 times per week during the brief spring growth period; essentially none during summer dormancy | Pet-safe |
| 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 |
| Tormentil | Bright indirect light (just back from a sunny window) | Moderate; keep soil lightly moist but not wet | Pet-safe |
| Touch of Class Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | 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 |
| Trachycarpus Latisectus | Bright indirect light (just back from a sunny window) | Regularly through the growing season; keep evenly moist but never soggy | Pet-safe |
| Trachycarpus Takil | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in summer; reduce sharply over winter | Pet-safe |
| Trailing 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 African Violet 'Rob's Vanilla Trail' | Bright indirect light (just back from a sunny window) | When the soil surface is just dry, about every 5-7 days | Pet-safe |
| Trailing Cape Primrose | Bright indirect light (just back from a sunny window) | every 7–10 days in active growth, every 14–21 days in winter | Pet-safe |
| Trailing Fuchsia | Bright indirect light (just back from a sunny window) | Every 7-10 days in summer; very sparingly 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 |
| 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 |
| Tree Fuchsia | Bright indirect light (just back from a sunny window) | Every 5-7 days in summer, reducing to every 14 days in winter | Pet-safe |
| Tree heath | Direct sun (at least 4-6 hours) | Fortnightly during the first growing season; drought-tolerant once established | Pet-safe |
| Tropaeolum majus 'Jewel of Africa' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days; containers more often in heat | Pet-safe |
| Tropical Sage | Medium indirect light (a couple of metres from a window) | Regular while establishing; reduced once established | Pet-safe |
| Trumpeter Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | 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 Loosestrife | Medium indirect light (a couple of metres from a window) | Permanently wet to shallow aquatic; bog garden or shallow pond margin | Pet-safe |
| Turkish Catmint | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; very sparingly in winter | Pet-safe |
| Turkish Red Sage | Bright indirect light (just back from a sunny window) | Allow to dry between waterings | Pet-safe |
| Turkish White Sage | Direct sun (at least 4-6 hours) | Every 10-14 days; minimal once dormant in summer heat | Pet-safe |
| Turquoise Puya | Direct sun (at least 4-6 hours) | weekly in summer, monthly in winter | Pet-safe |
| Tweedy's Lewisia | Bright indirect light (just back from a sunny window) | Regular in spring; near-dry from midsummer to early autumn | Pet-safe |
| 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 |
| Two-Row Stonecrop | Direct sun (at least 4-6 hours) | Every 10-14 days until established; essentially rain-fed once rooted | 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 |
| Unbranched Bur-reed | Direct sun (at least 4-6 hours) | Permanently aquatic or waterlogged; tolerates 0–60 cm (0–24 in) water depth | 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 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 |
| Valais fescue | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; more frequent only during establishment | 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 |
| Variegata Purple Moor Grass | Bright indirect light (just back from a sunny window) | Every 7-14 days; keep moderately moist to moist | Pet-safe |
| Variegated Greater Pond Sedge | Bright indirect light (just back from a sunny window) | Keep consistently wet — tolerates standing water | 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 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 |
| 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 |
| Velvet Sage | Bright indirect light (just back from a sunny window) | Weekly | Pet-safe |
| Veterans' Honor Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Viola 'Sorbet Raspberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 3-5 days; containers more often | Pet-safe |
| Viola × wittrockiana 'Delta Pure Yellow' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, typically every 3-5 days; containers dry faster | Pet-safe |
| Viola cornuta 'Etain' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, generally every 3-5 days; more in containers and heat | Pet-safe |
| Violet 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 |
| Virginia Bluebells | Medium indirect light (a couple of metres from a window) | 1–2 inches per week in spring; minimal needed once dormant | Pet-safe |
| Virginia Pine Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm is dry, frequently daily in summer and every few days in cooler months | Pet-safe |
| Virginia Spring Beauty | Bright indirect light (just back from a sunny window) | Moderate in spring; negligible once dormant in summer | 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 |
| 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 |
| Waldensian Saxifrage | Direct sun (at least 4-6 hours) | Very low — allow soil to dry between waterings; withhold almost entirely in winter | Pet-safe |
| Walker's 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 |
| Warming's Sinningia | Bright indirect light (just back from a sunny window) | Moderate during active growth; dry during dormancy | Pet-safe |
| Water Lily Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in spring and summer; every 3-4 weeks in autumn; almost none in winter | Pet-safe |
| Water Speedwell | Direct sun (at least 4-6 hours) | Permanently wet to shallow submersion | Pet-safe |
| Water Violet | Bright indirect light (just back from a sunny window) | Fully submerged aquatic; grows in 20–80 cm of water | Pet-safe |
| Wave Petunia | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, often daily in baskets and hot weather | Pet-safe |
| Wave purple petunia | Direct sun (at least 4-6 hours) | Every 3–5 days in containers; every 7–10 days in borders | Pet-safe |
| Wavyleaf Coneflower | Direct sun (at least 4-6 hours) | Weekly during establishment (first season); monthly or rainfall-dependent once mature | 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 |
| Weeping Nootka Cypress | Direct sun (at least 4-6 hours) | Regularly during establishment; moderate once mature | Pet-safe |
| Weigela 'My Monet' | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil dries, about weekly while establishing | 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 |
| Weigela 'Wine & Roses' | Direct sun (at least 4-6 hours) | Water when the top 5 cm of soil is dry, about weekly while establishing | Pet-safe |
| 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 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 |
| Wheat cockscomb | Direct sun (at least 4-6 hours) | Every 5–7 days in active growth; reduce in cooler periods | 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 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 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 mountain heather | Direct sun (at least 4-6 hours) | Consistently moist during the growing season; reduce in winter | Pet-safe |
| White Nancy Dead Nettle | Medium indirect light (a couple of metres from a window) | Every 7–10 days during active growth; reduce in winter | Pet-safe |
| White Passionflower | Direct sun (at least 4-6 hours) | Once a week during dry spells; less in winter | 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 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 Trumpet Pitcher | Direct sun (at least 4-6 hours) | Keep constantly wet via the tray method, standing in 1-3 cm of water through the growing season | Pet-safe |
| White wood aster | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks during establishment; largely self-sufficient once established in woodland settings | 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 |
| 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 |
| Whorled Water Milfoil | Direct sun (at least 4-6 hours) | Permanently submerged | Pet-safe |
| Wickwar Flame heather | Direct sun (at least 4-6 hours) | Weekly during establishment, then as needed | Pet-safe |
| Wide-Leaved Sea Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks when established | Pet-safe |
| Wild Edric Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season, more in heat or sandy soil | Pet-safe |
| Wild jasmine | Bright indirect light (just back from a sunny window) | Once or twice a week during active growth; reduce in winter | Pet-safe |
| Wild nemesia | Direct sun (at least 4-6 hours) | Every 7–14 days once established; more frequently when young | Pet-safe |
| Wild pansy | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep soil evenly moist but not wet | Pet-safe |
| Wild Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then rarely once mature | 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 Buchanan heath | Bright indirect light (just back from a sunny window) | Moderate; water regularly, especially during flowering and in dry summers | 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 |
| Wilson Spruce | Direct sun (at least 4-6 hours) | Weekly when young; established trees are drought-tolerant | 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 |
| 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 |
| 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 Forget-me-not | Medium indirect light (a couple of metres from a window) | Moderate; keep soil moist but well-drained | 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 Rock Jasmine | Direct sun (at least 4-6 hours) | Moderate in summer; very little in winter | 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 |
| Xalapa Sage | Direct sun (at least 4-6 hours) | Allow the top 5 cm of soil to dry between waterings | 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 Clintonia | Low light (north window or shaded room) | Twice weekly in dry spells; maintain even soil moisture throughout the growing season | 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 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 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 Marliac Water Lily | Direct sun (at least 4-6 hours) | Permanently aquatic — crown submerged 15–75 cm (6–30 in) below water surface | Pet-safe |
| Yellow Monkeyflower | Bright indirect light (just back from a sunny window) | Keep soil permanently wet; never allow to dry out | Pet-safe |
| Yellow Moth Orchid | Bright indirect light (just back from a sunny window) | When the bark is nearly dry, typically every 7-10 days | 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 Pitcher Plant | Direct sun (at least 4-6 hours) | Keep permanently wet; stand the pot in 1-3 cm of water during the growing season (tray method) | Pet-safe |
| Yellow Tower Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, every 7-14 days in spring and summer; every 4-6 weeks in autumn; once monthly or less in winter | Pet-safe |
| Yellow Water Lily | Direct sun (at least 4-6 hours) | Permanently aquatic — crown submerged 15–45 cm (6–18 in) below water surface | Pet-safe |
| Yellow Whitlowgrass | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; minimal in winter | Pet-safe |
| Yellow-flowered Sage | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; very sparingly in winter | Pet-safe |
| Yellow-Twig Dogwood | Bright indirect light (just back from a sunny window) | Regularly; keep soil consistently moist | 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 |
| Zephirine Drouhin Rose | Direct sun (at least 4-6 hours) | Deeply once a week in the growing season; more in heat or during establishment | Pet-safe |
| Zigzag Clover | Medium indirect light (a couple of metres from a window) | Moderate; tolerates short dry spells once established | Pet-safe |
| Zinnia | Direct sun (at least 4-6 hours) | Deep watering once a week | Pet-safe |
| Zinnia 'Benary's Giant' | Direct sun (at least 4-6 hours) | When top 3-4 cm of soil is dry, roughly every 4-6 days in summer | 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 'Benary's Giant Coral' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 4-7 days | 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 |
| Zoys's Bellflower | Direct sun (at least 4-6 hours) | Allow soil to dry between waterings; very sparingly in winter | Pet-safe |
| Zygopetalum 'Artur Elle' | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, every 5-7 days, easing back as pseudobulbs mature | Pet-safe |
| Zygopetalum 'Blue Eyes' | Bright indirect light (just back from a sunny window) | Keep evenly moist, watering when the surface starts to dry, roughly every 4-6 days | Pet-safe |
| Zygopetalum 'Redvale' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is approaching dry, roughly every 5-7 days | Pet-safe |
| Zygopetalum 'Titanic' | Bright indirect light (just back from a sunny window) | Keep evenly moist during growth, every 5-7 days, reducing as pseudobulbs mature | Pet-safe |
| Zygopetalum intermedium | Bright indirect light (just back from a sunny window) | Keep evenly moist during growth, every 5-7 days, reducing once pseudobulbs mature | Pet-safe |
| Zygopetalum mackaii | Bright indirect light (just back from a sunny window) | Keep evenly moist in growth, every 5-7 days, easing off after the pseudobulbs mature | Pet-safe |
This list is not hand-picked for looks. It is plants that are both ASPCA non-toxic to cats and dogs and grown for their flowers, drawn from Growli's structured plant-care library so the selection is consistent and checkable. 1800 plants qualify today.
Growli currently lists 1800 plants that meet the criterion (plants that are both ASPCA non-toxic to cats and dogs and grown for their flowers). The list updates as the plant-care library grows; each entry links to a full care guide.
Yes — every plant on this list is classified as non-toxic to cats and dogs against the ASPCA toxic and non-toxic plant list. Tap any plant for its full pet-safety detail.
Once you have shortlisted a plant, the next questions are watering and soil. These are the guides searched most this season: