| Abelia chinensis | Direct sun (at least 4-6 hours) | Weekly through the first season, then mainly during dry spells | Mildly toxic to pets |
| Abelia x grandiflora | Direct sun (at least 4-6 hours) | Weekly deep soak in the first season, then only during prolonged dry spells once established | Mildly toxic to pets |
| Acorus gramineus | Bright indirect light (just back from a sunny window) | Keep soil constantly moist to wet; never allow to dry out | Mildly toxic to pets |
| Acorus gramineus 'Variegatus' | Bright indirect light (just back from a sunny window) | Keep soil constantly moist to wet at all times | Mildly toxic to pets |
| Actinidia kolomikta | Direct sun (at least 4-6 hours) | Keep soil evenly moist, watering deeply about weekly in dry summer spells | Mildly toxic to pets |
| Aerangis biloba | Bright indirect light (just back from a sunny window) | Every 1-3 days when mounted; every 3-5 days in a small basket, kept lightly moist | Pet-safe |
| Aerangis fastuosa | Medium indirect light (a couple of metres from a window) | Water every 1-3 days, keeping the roots consistently moist | Pet-safe |
| Aesculifolia Rodgersia | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply 1-2 times weekly, more in heat | Mildly toxic to pets |
| African Marigold 'Crackerjack' | Direct sun (at least 4-6 hours) | When top 3-4 cm of soil is dry, about every 4-7 days | Mildly toxic to pets |
| African Wormwood | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly for container specimens | Mildly toxic to pets |
| Agastache 'Blue Fortune' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Agave Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; very sparingly in winter | Pet-safe |
| Agnes Rose | Direct sun (at least 4-6 hours) | Deep watering once a week, more in drought or first season | Pet-safe |
| Agrimony | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought, roughly every 10-14 days | Mildly toxic to pets |
| Alcantarea odorata | Bright indirect light (just back from a sunny window) | Keep the central tank filled; water the mix when its top 4-5 cm is dry | Pet-safe |
| Alexandria Alpine Strawberry | Direct sun (at least 4-6 hours) | Keep evenly moist; water 2-3 times a week in warm weather | Pet-safe |
| All Gold Lemon Balm | Medium indirect light (a couple of metres from a window) | Every 3–5 days; when top inch of soil feels dry | Pet-safe |
| All Gold Lemon Balm | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep evenly moist | Pet-safe |
| Allegheny serviceberry | Bright indirect light (just back from a sunny window) | Weekly during establishment; moderate once established | Pet-safe |
| Allegheny Spurge | Low light (north window or shaded room) | Weekly during the first 1–2 growing seasons; every 2–3 weeks once established | Mildly toxic to pets |
| Allium 'Gladiator' | Direct sun (at least 4-6 hours) | Water during spring growth; keep dry in summer dormancy, every 2-3 weeks at most if drought-stressed | Toxic to pets |
| Alocasia Odora | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 4-7 days in growth | Toxic to pets |
| Alpine Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Amanus Oregano | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; monthly in winter | Pet-safe |
| Amazon Moonflower Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of substrate is dry, roughly every 7-10 days in the growing season; every 2-3 weeks in a cooler rest period | Pet-safe |
| America Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while establishing; mature plants when the top few centimetres of soil dry out | Pet-safe |
| American Basswood | Bright indirect light (just back from a sunny window) | Weekly during establishment; less once mature | Pet-safe |
| American Sweet Flag | Direct sun (at least 4-6 hours) | Constantly moist to wet — tolerates shallow standing water up to 20 cm (8 in) deep. | Mildly toxic to pets |
| 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 |
| American wisteria | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once mature | Toxic to pets |
| Andean Silver-Leaf Sage | Direct sun (at least 4-6 hours) | Allow soil to dry 2–3 cm between waterings | Mildly toxic to pets |
| Angel Face Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | Pet-safe |
| Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 1-3 days in peak summer growth; far less when dormant or overwintering | Toxic to pets |
| Angel's Trumpet Hybrid | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (keep consistently moist) | Toxic to pets |
| 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 | Direct sun (at least 4-6 hours) | Keep soil moderately and evenly moist, watering when the top 2-3 cm dries, about weekly | Mildly toxic to pets |
| Anise hyssop | Direct sun (at least 4-6 hours) | Weekly watering | Pet-safe |
| Anise-scented Sage | Bright indirect light (just back from a sunny window) | Regular throughout the growing season | 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 |
| Anouk French lavender | Direct sun (at least 4-6 hours) | Weekly in containers; every 10–14 days in-ground during dry periods | Mildly toxic to pets |
| Anthurium amnicola | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-7 days | Toxic to pets |
| Apricot Sprite Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days once established; more frequent in containers | 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 |
| Arching Spider Orchid | Bright indirect light (just back from a sunny window) | When the medium nears dryness, about every 4-6 days in warm growth | Mildly toxic to pets |
| Argentine Giant Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 1-2 weeks in summer; keep dry in winter | Pet-safe |
| Armand's Clematis | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days | Toxic to pets |
| Aromatic Aster | Direct sun (at least 4-6 hours) | Water to establish, then rarely; very drought-tolerant | Pet-safe |
| Aromatic Aster 'Raydon's Favorite' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, roughly every 10-14 days once established | Mildly toxic to pets |
| Aromatic Didymocarpus | Medium indirect light (a couple of metres from a window) | Once or twice a week in the growing season; reduce in winter | Pet-safe |
| Asian Star Jasmine | Medium indirect light (a couple of metres from a window) | Water every 7-10 days during the first growing season; established plants are fairly drought-tolerant and need watering only during prolonged dry periods | Mildly toxic to pets |
| Aster 'Raydon's Favorite' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Auricula | Bright indirect light (just back from a sunny window) | Moderately in spring and summer; reduce significantly in autumn and winter | Toxic to pets |
| Auricula Primrose | Bright indirect light (just back from a sunny window) | Water when top 2 cm of soil is dry; more frequent in active growth, sparingly in summer | Mildly toxic to pets |
| Autumn Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and early summer; taper to every 2–3 weeks in late summer | Pet-safe |
| Autumn Olive | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly while young, rarely once established | Pet-safe |
| Axillary Balm | Medium indirect light (a couple of metres from a window) | Every 5–7 days during the growing season; reduce in winter | Pet-safe |
| Azalea 'Weston's Flamingo' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly every 5-7 days in summer; reduce in winter | Toxic to pets |
| Azores Jasmine | Direct sun (at least 4-6 hours) | Every 5–7 days in summer; every 10–14 days in winter | Pet-safe |
| Babaco | Direct sun (at least 4-6 hours) | When the top 3–4 cm of soil is dry, roughly every 5–7 days in summer | Mildly toxic to pets |
| Baboon Flower | Direct sun (at least 4-6 hours) | Regular during growth and flowering, dry during summer dormancy | Mildly toxic to pets |
| Bacuri | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-8 days in growth | Mildly toxic to pets |
| Bai Zhi | Medium indirect light (a couple of metres from a window) | 2-3 times per week; keep soil consistently moist | Mildly toxic to pets |
| Baker's Tulip | Direct sun (at least 4-6 hours) | Moderate in spring; dry in summer | Toxic to pets |
| 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 |
| Basket Plant | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of soil is dry, about every 7-12 days | Toxic to pets |
| Bay laurel | Direct sun (at least 4-6 hours) | Weekly watering in pots | Toxic to pets |
| Beautiful Gastrochilus | Bright indirect light (just back from a sunny window) | Daily misting of roots; soak mounted plants every 2-3 days during active growth; reduce to every 5-7 days in cooler months | Pet-safe |
| Bee Balm 'Cambridge Scarlet' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days during the growing season | Pet-safe |
| Begonia 'Fragrant Beauty' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days in growth | Toxic to pets |
| Begonia odorata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 4-7 days in growth | Toxic to pets |
| Begonia solananthera | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Belladonna Lily | Direct sun (at least 4-6 hours) | Minimal or none in summer dormancy; regular from flower emergence through winter while foliage is active; reduce in late spring | Toxic to pets |
| Belle Etoile Mock Orange | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-14 days | Mildly toxic to pets |
| 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 |
| Berggarten Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; about every 7-10 days, less in cool weather | Pet-safe |
| Black Beauty Elderberry | Direct sun (at least 4-6 hours) | Weekly in the first two seasons; established plants tolerate short dry spells | Mildly toxic to pets |
| Black Knight Butterfly Bush | Direct sun (at least 4-6 hours) | Every 7-10 days during the first growing season; established plants are drought-tolerant and require supplemental watering only during extended dry spells | Toxic to pets |
| Black Knight scabiosa | Direct sun (at least 4-6 hours) | Once or twice weekly | Pet-safe |
| Black Sage | Direct sun (at least 4-6 hours) | Once established, rainfall only (summer-dry) | Pet-safe |
| Bladder-flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Blanc Double de Coubert Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Blanco's Sage | Direct sun (at least 4-6 hours) | Every 2-4 weeks once established | Pet-safe |
| Blue Anise Sage | Bright indirect light (just back from a sunny window) | Weekly | Pet-safe |
| Blue Douglas Fir | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days when young | Mildly toxic to pets |
| Blue Lace Zygopetalum | Bright indirect light (just back from a sunny window) | Every 3–4 days in active growth, weekly in winter | Pet-safe |
| Blue-Flowered Air Plant | Bright indirect light (just back from a sunny window) | Once or twice weekly | Pet-safe |
| Blunt-Leaf Wax Plant | Medium indirect light (a couple of metres from a window) | Every 7–14 days in growing season; reduce significantly in winter | Pet-safe |
| Bolivian Torch Cactus | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; once a month or less in winter | Mildly toxic to pets |
| Bolus' Stomatium | Bright indirect light (just back from a sunny window) | Very sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Borden's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| 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 |
| Bow Bells Cattleya | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; every 10–14 days in winter | Pet-safe |
| box honeysuckle | Bright indirect light (just back from a sunny window) | Regularly during the first season; drought-tolerant once established | Mildly toxic to pets |
| Bracken's Brown Beauty Magnolia | Direct sun (at least 4-6 hours) | Deeply weekly during the first 2–3 years; every 2–3 weeks once established | Mildly toxic to pets |
| Bracteate Rhinephyllum | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring–summer; minimal in winter | Pet-safe |
| Bracted Dendrobium | Bright indirect light (just back from a sunny window) | Freely when in active growth (every 2-4 days); reduce sharply to monthly in the dry winter rest | Pet-safe |
| Brandy Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season | Pet-safe |
| Brassavola cucullata | Direct sun (at least 4-6 hours) | Water thoroughly, then let it dry out almost completely before watering again | Mildly toxic to pets |
| Brassavola digbyana | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; far less in winter rest, every 2-3 weeks | Pet-safe |
| Broad-leaf Chain Orchid | Medium indirect light (a couple of metres from a window) | Every 5-7 days in growth; every 10-14 days in winter | Pet-safe |
| Broad-Leaved Lime | Bright indirect light (just back from a sunny window) | Weekly during establishment; supplemental watering in prolonged drought | Pet-safe |
| Broad-Leaved Primrose | Medium indirect light (a couple of metres from a window) | Regularly throughout the growing season; reduced in winter | Toxic to pets |
| Browning Coelogyne | Medium indirect light (a couple of metres from a window) | Evenly moist in the growing season (mid-spring to early autumn); water every 3–4 weeks in winter rest | Pet-safe |
| Buddha's Hand Citron | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, typically every 5-10 days | Toxic to pets |
| Buddleja alternifolia | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in drought | Mildly toxic to pets |
| Buddleja davidii 'White Profusion' | Direct sun (at least 4-6 hours) | Weekly while establishing, then only in dry spells | Mildly toxic to pets |
| 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 |
| Buffalo Currant | Direct sun (at least 4-6 hours) | Every 7–10 days while establishing; minimal once mature | Mildly toxic to pets |
| Bunch-flowered Narcissus | Bright indirect light (just back from a sunny window) | Moderate and consistent during active growth; reduce sharply as foliage yellows; dormant dry | Toxic to pets |
| Burnet Rose | Direct sun (at least 4-6 hours) | Weekly during establishment; rarely once mature | Pet-safe |
| Burton's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; reduce to every 3–4 weeks in winter | Pet-safe |
| Bush Hoya | Bright indirect light (just back from a sunny window) | Roughly weekly in summer; every 10-14 days in winter | Pet-safe |
| Butterfly bush | Direct sun (at least 4-6 hours) | Every 1–2 weeks during establishment; drought-tolerant once established | Mildly toxic to pets |
| Butterfly Bush 'Black Knight' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly in the first season, then only in prolonged drought | Mildly toxic to pets |
| Butterfly Bush 'Pink Delight' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly through the first year, then sparingly | Mildly toxic to pets |
| Calamondin orange | Direct sun (at least 4-6 hours) | When the top 2–3 cm (1 inch) of compost feels dry | Toxic to pets |
| Calamondin orange | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-10 days in summer | Toxic to pets |
| 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 |
| Campbell's Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce sharply after leaf drop | Pet-safe |
| Canada Mayflower | Low light (north window or shaded room) | 2–3 times per week during the growing season; minimal in dormancy | Mildly toxic to pets |
| Capped Catasetum | Direct sun (at least 4-6 hours) | Abundant daily to every-other-day during growth; dry rest in winter | 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 |
| Carnation of India | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth, every 10-14 days in winter | Toxic to pets |
| Caryopteris x clandonensis 'Dark Knight' | Direct sun (at least 4-6 hours) | Weekly during establishment, then sparingly in dry spells | Mildly toxic to pets |
| Cat Thyme | Direct sun (at least 4-6 hours) | Water sparingly; allow soil to dry between waterings | Mildly toxic to pets |
| Catasetum fimbriatum | Bright indirect light (just back from a sunny window) | Heavily in active growth; withhold almost entirely after leaf drop | Mildly toxic to pets |
| Catasetum Orchid | Bright indirect light (just back from a sunny window) | Heavy in summer growth; none during winter dormancy | Mildly toxic to pets |
| 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 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 Lily | Bright indirect light (just back from a sunny window) | Moderate — keep soil consistently moist but not waterlogged | Toxic to pets |
| 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 |
| Celadine Frangipani | Direct sun (at least 4-6 hours) | Every 7–14 days in growth; reduce sharply in autumn; minimal in winter | Toxic to pets |
| Celery | Direct sun (at least 4-6 hours) | Every 2–4 days; soil must remain consistently moist | Pet-safe |
| Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce in winter | Toxic to pets |
| Chamomile | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 7-10 days | Toxic to pets |
| Charentais Melon | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, about 25 mm | Pet-safe |
| Charles Joly Lilac | Direct sun (at least 4-6 hours) | Every 7-10 days during dry periods; drought-tolerant once established | Mildly toxic to pets |
| Charlotte Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat | Pet-safe |
| Chaytor's Lavender | Direct sun (at least 4-6 hours) | Low — deep watering every 2–3 weeks when actively growing; reduce to near-zero in winter | Toxic to pets |
| Chilean Jasmine | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 4-7 days in summer | Mildly toxic to pets |
| Chinese astilbe | Medium indirect light (a couple of metres from a window) | Once or twice per week; more in hot weather | Pet-safe |
| Chinese Flowering Quince | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil approaches dry, often daily in summer heat | Mildly toxic to pets |
| Chinese Honeysuckle | Direct sun (at least 4-6 hours) | Every 3–5 days during the growing season; reduce in cooler months | Mildly toxic to pets |
| Chinese Incense Cedar | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days for young plants | Mildly toxic to pets |
| Chinese peony | Direct sun (at least 4-6 hours) | Moderate — once or twice weekly during active growth; reduce significantly after foliage dies back in autumn | Mildly toxic to pets |
| Chinese Peony 'Sarah Bernhardt' | Direct sun (at least 4-6 hours) | Deeply once or twice a week during dry spells; reduce after foliage dies back | Toxic to pets |
| Chinese witch hazel | Bright indirect light (just back from a sunny window) | Regularly during establishment (first 2–3 years); once established, during dry periods in summer | Mildly toxic to pets |
| Chinese Witch Hazel | Direct sun (at least 4-6 hours) | When the top 5-8 cm of soil is dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| Chiric Sanango | Bright indirect light (just back from a sunny window) | Every 5-7 days in active growth, every 10-14 days in winter | Toxic to pets |
| Chive-Leaved Thrift | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in winter | Mildly toxic to pets |
| Chocolate Mint | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil is dry, often every 2-4 days in summer | Toxic to pets |
| Chocolate orchid | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 5-9 days | Pet-safe |
| Choisya 'Sundance' | Direct sun (at least 4-6 hours) | Water weekly while establishing, then only during extended dry periods | Mildly toxic to pets |
| Choisya ternata | Direct sun (at least 4-6 hours) | Water deeply once a week through the first two seasons, then only in prolonged dry spells | Mildly toxic to pets |
| Choisya x dewitteana 'Aztec Pearl' | Direct sun (at least 4-6 hours) | Water weekly through the first two years, then only in dry spells | Mildly toxic to pets |
| 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 Orchid | Bright indirect light (just back from a sunny window) | When the potting medium is nearly dry, approximately every 7-10 days in active growth; reduce to every 14-21 days in autumn | 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 |
| Citron | Direct sun (at least 4-6 hours) | Every 7-10 days in the growing season; every 14-21 days in winter | Mildly toxic to pets |
| Citronella Grass | Direct sun (at least 4-6 hours) | Every 5–7 days; more frequently in containers in hot weather | Mildly toxic to pets |
| Clary Sage | Direct sun (at least 4-6 hours) | When soil is dry several centimetres down, roughly every 7-10 days once established | Pet-safe |
| Clematis 'Rubens' | Direct sun (at least 4-6 hours) | Once or twice a week during dry spells, especially the first two seasons | Toxic to pets |
| Clematis armandii | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly weekly in the growing season | Toxic to pets |
| Clematis montana 'Grandiflora' | Direct sun (at least 4-6 hours) | Once or twice a week while establishing; drought-tolerant once mature | Toxic to pets |
| Clematis recta | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week in the growing season | Toxic to pets |
| Clethra alnifolia | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry weather, tolerant of wet ground | Mildly toxic to pets |
| Clethra alnifolia 'Hummingbird' | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry weather, tolerant of wet ground | Mildly toxic to pets |
| Clethra alnifolia 'Ruby Spice' | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply 1-2 times weekly in the first two seasons and during drought | Mildly toxic to pets |
| Clethra barbinervis | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water deeply weekly in the first two seasons and during dry spells | Mildly toxic to pets |
| 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 |
| Climbing Oleander | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; allow topsoil to dry slightly between waterings | Toxic to pets |
| 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 |
| Clustered Dendrobium | Bright indirect light (just back from a sunny window) | Every 5-7 days in summer; reduce sharply to monthly or less in winter | Pet-safe |
| Clustered Freesia | Direct sun (at least 4-6 hours) | Moderate during growth; reduce to dry after dormancy | Pet-safe |
| Clustered Sanicle | Low light (north window or shaded room) | Every 1–2 weeks; maintain consistent moisture, never waterlogged | Mildly toxic to pets |
| 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 |
| Coastal Doghobble | Medium indirect light (a couple of metres from a window) | Every 5–7 days; regular deep watering essential in dry periods | Toxic to pets |
| Coconut Thyme | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 10-14 days once established | Pet-safe |
| Coconut-Scented Bulbophyllum | Medium indirect light (a couple of metres from a window) | Every 3–4 days during growth; every 6–10 days in winter | Pet-safe |
| Coconut-Scented Geranium | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in active growth | Toxic to pets |
| Coelogyne flaccida | Bright indirect light (just back from a sunny window) | Every 4-7 days in growth; reduced over winter | Pet-safe |
| Coelogyne nitida | Bright indirect light (just back from a sunny window) | Water 2-3 times weekly in growth; reduce to roughly weekly in the cool winter rest | Mildly toxic to pets |
| Coelogyne pandurata | Bright indirect light (just back from a sunny window) | Water freely in active growth, about every 3-5 days, easing to a lighter winter regime | Mildly toxic to pets |
| Coffee Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost feels dry, roughly every 5-7 days in summer and less in winter | Toxic to pets |
| Columnar Douglas Fir | Direct sun (at least 4-6 hours) | Moderate during establishment; reduced once established | Pet-safe |
| Comice pear | Direct sun (at least 4-6 hours) | Weekly during dry periods; increase during fruit development in late summer | Mildly toxic to pets |
| Common Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (soil should be consistently moist but not waterlogged) | Toxic to pets |
| Common Evening Primrose | Direct sun (at least 4-6 hours) | Every 10–14 days; highly tolerant of drought once established | Pet-safe |
| Common Hyacinth | Direct sun (at least 4-6 hours) | Weekly when in active growth; withhold water during summer dormancy | Toxic to pets |
| Common Jasmine | Direct sun (at least 4-6 hours) | Water regularly while establishing and in dry spells; water when the top few cm of soil dries | Pet-safe |
| Common Lilac | Direct sun (at least 4-6 hours) | Deeply once a week in the first year, then only in drought | Mildly toxic to pets |
| Common Lime | Direct sun (at least 4-6 hours) | Regular in first 2–3 years; occasional once established | Pet-safe |
| Common Milkweed | Direct sun (at least 4-6 hours) | Moderate; weekly when establishing, drought-tolerant once established | Toxic to pets |
| Common peony | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce after bloom | Mildly toxic to pets |
| Common Witch Hazel 'Arnold Promise' | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry; keep evenly moist in the first years and during droughts | Mildly toxic to pets |
| Compact Oregano | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 14–21 days in winter | Pet-safe |
| Compact Thyme | Direct sun (at least 4-6 hours) | Every 7–14 days outdoors; 10–14 days indoors | Pet-safe |
| Compacta Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-10 days | Pet-safe |
| 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 |
| Conophytum Calculus | Bright indirect light (just back from a sunny window) | During autumn-to-spring growth, every 1-2 weeks; none through summer dormancy | Mildly toxic to pets |
| 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 |
| Copal Bursera | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; once or twice monthly in winter | Mildly toxic to pets |
| Corn plant | Medium indirect light (a couple of metres from a window) | When the top half of the soil is dry, every 10-14 days | Toxic to pets |
| 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 |
| Corsican Mint | Bright indirect light (just back from a sunny window) | Keep evenly moist; water whenever the surface starts to dry, often every 1-3 days | Toxic to pets |
| Costa Rica Pitaya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 2-4 weeks in winter | Pet-safe |
| Costa Rican Stanhopea | Bright indirect light (just back from a sunny window) | Every 3–5 days in growth; reduce to weekly in winter | Pet-safe |
| Costmary | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 7-10 days; less once established | Mildly toxic to pets |
| Cotton Lavender | Direct sun (at least 4-6 hours) | Every 2–4 weeks once established; minimal in winter | Mildly toxic to pets |
| Cowslip | Medium indirect light (a couple of metres from a window) | Twice weekly in active growth, reduce to once weekly when dormant in summer | Toxic to pets |
| Crape Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days during growing season; reduce in winter | Toxic to pets |
| Creeping Lemon Thyme | Direct sun (at least 4-6 hours) | When the top few cm of soil are dry, roughly every 7-10 days | Pet-safe |
| Creeping Rosemary | Direct sun (at least 4-6 hours) | Every 7–14 days; allow soil to dry out between waterings | Pet-safe |
| Creeping Savory | Direct sun (at least 4-6 hours) | Every 10–14 days during dry spells; minimal in winter | Pet-safe |
| Creeping Thyme | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-14 days once established | Pet-safe |
| Creeping Winter Savory | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-12 days; less once established | Pet-safe |
| Creeping Woodland Phlox | Medium indirect light (a couple of metres from a window) | Weekly; maintain consistent moisture | Mildly toxic to pets |
| 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 |
| Crested Floating Heart | Direct sun (at least 4-6 hours) | Permanently aquatic; maintain 10–60 cm water depth | Mildly toxic to pets |
| Crested Vanda | Bright indirect light (just back from a sunny window) | Daily to every other day in summer; every 3-5 days in winter | Pet-safe |
| Cretan Arum | Direct sun (at least 4-6 hours) | Moderate during autumn–spring active growth; completely dry in summer | Toxic to pets |
| 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-Spot Rock Rose | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; weekly in the first growing season | Mildly toxic to pets |
| Crocus chrysanthus 'Cream Beauty' | Direct sun (at least 4-6 hours) | Rely on rainfall; water only during a dry establishment period after planting or a droughty spring | Mildly toxic to pets |
| Crosswort | Medium indirect light (a couple of metres from a window) | Low to moderate — rainfall sufficient in UK | Mildly toxic to pets |
| Crown Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| Cuban Oregano | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Cup of gold vine | Direct sun (at least 4-6 hours) | Water to keep soil evenly moist during the growing season; reduce to occasional deep watering in winter | Toxic to pets |
| Cupani sweet pea | Direct sun (at least 4-6 hours) | Every 3–5 days in warm growing conditions; adjust for rainfall | Toxic to pets |
| Cupuaçu | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil starts to dry, typically every 3-6 days in growth | Mildly toxic to pets |
| Curry Leaf Plant | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry | Mildly toxic to pets |
| Curry plant | Direct sun (at least 4-6 hours) | Every 10–14 days; allow soil to dry between waterings | 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 |
| Dainty Bess Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Daphne cneorum | Direct sun (at least 4-6 hours) | Water when the top few centimetres of soil are dry; keep evenly moist but sharply drained | Toxic to pets |
| Daphne mezereum | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist, never waterlogged | Toxic to pets |
| Daphne odora | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist, never soggy | Toxic to pets |
| Daphne odora 'Aureomarginata' | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist but never wet | Toxic to pets |
| Daphne x burkwoodii 'Carol Mackie' | Bright indirect light (just back from a sunny window) | Water when the top few centimetres of soil are dry; keep evenly moist, never waterlogged | Toxic to pets |
| Darcey Bussell Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; container plants more often | Pet-safe |
| Dawn viburnum | Bright indirect light (just back from a sunny window) | Weekly in the first two seasons; every 2–3 weeks once established | Mildly toxic to pets |
| Daylily 'Catherine Woodbery' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season; every 2-3 weeks during dormancy | Toxic to pets |
| Daylily 'Double River Wye' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; every 2-3 weeks during dormancy | Toxic to pets |
| Daylily 'Fragrant Returns' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; consistent moisture supports multiple rebloom cycles | Toxic to pets |
| Daylily 'Hyperion' | Direct sun (at least 4-6 hours) | Every 7-10 days during active growth; every 2-3 weeks in dormancy | Toxic to pets |
| Daylily 'Miss Amelia' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Daylily 'Rosy Returns' | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Daylily 'Strawberry Candy' | Direct sun (at least 4-6 hours) | Every 7-10 days during the growing season, or when the top 5 cm of soil is dry | Toxic to pets |
| Deciduous Azalea 'Gibraltar' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply 1-2 times weekly through summer, more in heat | Toxic to pets |
| Delicate Air Plant | Bright indirect light (just back from a sunny window) | Soak for 20–30 minutes once a week | Pet-safe |
| Dendrobium 'Berry Oda' | Bright indirect light (just back from a sunny window) | When the bark is nearly dry, roughly every 5-7 days in growth | Pet-safe |
| Dendrochilum cobbianum | Bright indirect light (just back from a sunny window) | 2-3 times per week, allowing only slight drying between waterings | Pet-safe |
| Dendrochilum filiforme | Bright indirect light (just back from a sunny window) | 2-3 times per week, letting the medium dry only slightly between waterings | Pet-safe |
| Dendrochilum glumaceum | Bright indirect light (just back from a sunny window) | 2-3 times per week, letting the medium dry only slightly between waterings | Pet-safe |
| Denison's Vanda | Bright indirect light (just back from a sunny window) | Abundant watering in active growth (spring–summer); reduce to light morning fogging every few days in winter | Pet-safe |
| Dense Ginger Lily | Bright indirect light (just back from a sunny window) | Regularly through spring and summer; minimal in winter dormancy | Mildly toxic to pets |
| Dense Ginger Lily | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in summer | Mildly toxic to pets |
| Dense-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in summer, much less in winter | Pet-safe |
| Diaguita Air Plant | Direct sun (at least 4-6 hours) | Mist or dunk thoroughly 2–3 times per week in summer; every 7–10 days in winter. | Pet-safe |
| Dianthus 'Doris' | Direct sun (at least 4-6 hours) | Water when the top few cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus 'Mrs Sinkins' | Direct sun (at least 4-6 hours) | Water when the top few cm of soil is dry; drought-tolerant once established | Toxic to pets |
| Dianthus gratianopolitanus 'Firewitch' | Direct sun (at least 4-6 hours) | Water when soil is dry; very drought-tolerant once established | Toxic to pets |
| Didier's Angraecum | Bright indirect light (just back from a sunny window) | 3–5 times per week in summer; reduce markedly in December–January after flowering | Pet-safe |
| Digyna Sweet Box | Low light (north window or shaded room) | Every 10-14 days during the first two growing seasons; established plants are drought-tolerant and need watering only in extended dry spells | Mildly toxic to pets |
| Diversifolia Wax Plant | Bright indirect light (just back from a sunny window) | Roughly every 1-2 weeks in spring and summer; less in autumn and winter | Pet-safe |
| Dog Rose | Direct sun (at least 4-6 hours) | Weekly during the first growing season; rarely once established | 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 |
| Double Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (keep soil consistently moist) | Toxic to pets |
| Double Delight Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Double Pink Oleander | Direct sun (at least 4-6 hours) | Water weekly when establishing; drought-tolerant once established | Toxic to pets |
| Double Pinwheel Flower | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce in winter | Toxic to pets |
| Downy Phlox | Direct sun (at least 4-6 hours) | Weekly when establishing; every 2-3 weeks when established | Mildly toxic to pets |
| Doyenne du Comice pear | Direct sun (at least 4-6 hours) | Weekly in dry periods; regularly during fruit development | Mildly toxic to pets |
| Dracaena 'Lemon Lime' | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 2-5 cm (1-2 in) of soil dry out first | Toxic to pets |
| Dracaena Deremensis Green Stripe | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dracaena Deremensis Warneckii | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dracaena Fragrans Lindenii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dracaena Fragrans Massangeana | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Dracaena Fragrans Sol | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-14 days | Toxic to pets |
| Dracaena Fragrans Victoria | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, every 7-10 days | Toxic to pets |
| Dracaena Warneckii | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 2-5 cm (1-2 in) of soil dry out first | Toxic to pets |
| Durat's Air Plant | Bright indirect light (just back from a sunny window) | Mist thoroughly 2–3 times per week; a 20-minute soak once a week is sufficient in summer. Reduce to every 10–14 days in winter. | Pet-safe |
| Dusty zenobia | Bright indirect light (just back from a sunny window) | Consistently moist — water deeply and regularly, especially in summer heat | Toxic to pets |
| Dwarf Balsam Fir | Direct sun (at least 4-6 hours) | Regularly; maintain consistently moist soil | Mildly toxic to pets |
| Dwarf Caribbean gesneria | Bright indirect light (just back from a sunny window) | Every 4–7 days; do not allow to dry out | Pet-safe |
| Dwarf Common Juniper | Direct sun (at least 4-6 hours) | Low; drought-tolerant once established | Mildly toxic to pets |
| 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 Shell Ginger | Medium indirect light (a couple of metres from a window) | Regularly during the growing season; reduce in winter | Mildly toxic to pets |
| Dwarf Sugar Palm | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Dwarf Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; every 3–4 days in winter | Pet-safe |
| Easter Lily | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil is dry | Toxic to pets |
| 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 | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 1–2 weeks once established | Pet-safe |
| Eau de Cologne Mint | Medium indirect light (a couple of metres from a window) | Every 3–5 days in summer; every 7–10 days in autumn and winter | Mildly toxic to pets |
| Echinopsis | Direct sun (at least 4-6 hours) | When the top few cm are dry, about every 1-2 weeks in summer; sparingly in winter | Toxic to pets |
| Ecuador Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (consistent moisture essential) | Toxic to pets |
| Eglantyne Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | Pet-safe |
| Egyptian White Water Lily | Direct sun (at least 4-6 hours) | Permanently submerged aquatic — maintain 22–40 cm of water over the crown | Pet-safe |
| Eitape Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Elliptic Kopsia | Direct sun (at least 4-6 hours) | Every 7–10 days when established; more frequently when young | Toxic to pets |
| Encyclia cordigera | Bright indirect light (just back from a sunny window) | Water roughly weekly in summer growth; reduce to occasional during the cooler winter rest | 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 |
| English Bluebell | Medium indirect light (a couple of metres from a window) | Moderate; naturally moist in spring, drier in summer | Toxic to pets |
| English Lavender | Direct sun (at least 4-6 hours) | When soil is dry several centimetres down, roughly every 10-14 days, rarely once established | Toxic to pets |
| Engraved Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer through autumn (active growth); withheld or near-zero from May through August | Pet-safe |
| Ermine Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days during the growing season; once every 4-6 weeks or less in winter | Mildly toxic to pets |
| Etruscan honeysuckle | Direct sun (at least 4-6 hours) | Weekly during dry spells; established plants are drought-tolerant | Mildly toxic to pets |
| Eucryphia × nymansensis 'Nymansay' | Direct sun (at least 4-6 hours) | Keep the root zone consistently moist; water every 5-10 days in dry or hot weather, especially while establishing | Mildly toxic to pets |
| Europeana Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | 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 |
| 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 |
| Few-Flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in growing season; reduce to every 3–4 weeks in winter | Pet-safe |
| Fishbone 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 |
| Five-Nerved Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days during active growth; every 14-21 days in winter | Pet-safe |
| Flat-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring and summer; reduce to every 14-21 days in winter | Pet-safe |
| Floating Aponogeton | Medium indirect light (a couple of metres from a window) | Permanently submerged bulb with floating leaves; fortnightly 20–25% water changes | Pet-safe |
| Flowering tobacco | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil consistently moist | Toxic to pets |
| Formosa Lily | Direct sun (at least 4-6 hours) | 2-3 times per week in active growth | Toxic to pets |
| Forrest Ginger Lily | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Fothergilla major | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, about weekly while establishing | Mildly toxic to pets |
| Fragrans Maidenhair Fern | Bright indirect light (just back from a sunny window) | Keep evenly moist at all times, often every 2-4 days | Pet-safe |
| Fragrant Agrimony | Direct sun (at least 4-6 hours) | Every 7-10 days; allow the top 3-4 cm of soil to dry between waterings | Pet-safe |
| Fragrant Bouquet Hosta | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply 1-2 times weekly, more in heat | Toxic to pets |
| Fragrant Bursera | Direct sun (at least 4-6 hours) | Every 7–10 days in summer growing season; very sparingly in winter | Mildly toxic to pets |
| Fragrant Hosta 'Guacamole' | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is dry, about every 5-7 days; more in sun and heat | Toxic to pets |
| Fragrant Maidenhair Fern | Bright indirect light (just back from a sunny window) | When the surface just begins to dry, roughly every 3-5 days | Pet-safe |
| Fragrant Orchid | Direct sun (at least 4-6 hours) | Very low to low — rain-fed only | Mildly toxic to pets |
| Fragrant Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; drought-tolerant once established | Toxic to pets |
| Fragrant Stanhopea | Bright indirect light (just back from a sunny window) | Daily or near-daily during active growth; reduce to every 2–3 days in winter | Pet-safe |
| Fragrant Stomatium | Bright indirect light (just back from a sunny window) | Sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Fragrant Sweet Box | Low light (north window or shaded room) | Every 10-14 days during establishment; established plants are very drought-tolerant and require watering only during prolonged dry periods | Mildly toxic to pets |
| Fragrant Water Lily | Direct sun (at least 4-6 hours) | Aquatic — permanently grown in standing water | Toxic to pets |
| 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 |
| Fraser Fir | Direct sun (at least 4-6 hours) | Regularly; moist but well-drained | Mildly toxic to pets |
| 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 '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 Marigold 'Durango' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, every 3-6 days; containers more often | Mildly toxic to pets |
| French Tarragon | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; let it dry between waterings | Toxic to pets |
| Freyn's Pink | Direct sun (at least 4-6 hours) | Infrequent; drought-tolerant once established | Mildly toxic to pets |
| Fringed Star Orchid | Bright indirect light (just back from a sunny window) | Every 4–7 days in active growth; every 7–10 days in winter | Pet-safe |
| Fringed Star Orchid | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of the mix feels dry, roughly every 7-10 days | Pet-safe |
| Fruit-scented Sage | Direct sun (at least 4-6 hours) | When the top 3-5 cm of compost is dry — roughly every 5-8 days in summer, less often in winter | Pet-safe |
| Fuller's Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; every 4-6 weeks or less in winter | Mildly toxic to pets |
| Galanga Resurrection Lily | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil feels dry, roughly every 5-7 days in the growing season; reduce significantly or cease in winter dormancy | Mildly toxic to pets |
| Garden Catmint | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; roughly every 7-10 days while establishing, then rarely | Mildly toxic to pets |
| Garden Phlox | Bright indirect light (just back from a sunny window) | 1-2 times per week during active growth | Mildly toxic to pets |
| 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 |
| Garden Phlox 'David' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-7 days in summer | Mildly toxic to pets |
| Garden Pink 'Mrs Sinkins' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Gardenia | Bright indirect light (just back from a sunny window) | When the top 2-3cm of compost feels dry | Toxic to pets |
| Gardenia 'Kleim's Hardy' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top 2-3 cm of soil begins to dry, roughly every 4-7 days | Toxic to pets |
| Gardenia 'Radicans' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 4-7 days | Toxic to pets |
| Gardenia 'Veitchii' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 4-7 days | Toxic to pets |
| Garland Chrysanthemum 'Shungiku' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, every 3-5 days | Toxic to pets |
| Gattefosse's Mint | Direct sun (at least 4-6 hours) | Every 2–3 days in growing season; every 5–7 days in winter | Mildly toxic to pets |
| 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 |
| Geranium cantabrigiense 'Cambridge' | Bright indirect light (just back from a sunny window) | Water deeply during the first season; established plants need watering only in prolonged drought | Mildly toxic to pets |
| Geranium macrorrhizum 'Bevan's Variety' | Medium indirect light (a couple of metres from a window) | When the top 4-5 cm of soil is dry; weekly to establish, seldom afterwards | Mildly toxic to pets |
| 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 |
| Germinyan's Angraecum | Bright indirect light (just back from a sunny window) | Every 4–6 days year-round; slight reduction in cooler months | 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 honeysuckle | Direct sun (at least 4-6 hours) | Twice weekly in active growth; reduce significantly in cooler months | Mildly toxic to pets |
| Giant Spider Lily | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 7-10 days in the growing season | Toxic to pets |
| Giant Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Gireoud's Brassia | Bright indirect light (just back from a sunny window) | Every 3–4 days during active growth; reduce to weekly or less in cooler months | Pet-safe |
| Gladiolus callianthus | Direct sun (at least 4-6 hours) | Weekly during growth, keeping soil moist but never sodden | Toxic to pets |
| Globe-Flowered Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–5 weeks in winter | Pet-safe |
| Glory of the Sun | Direct sun (at least 4-6 hours) | Moderate in growth; completely dry in summer dormancy | Mildly toxic to pets |
| Glossy Abelia | Direct sun (at least 4-6 hours) | Regularly during the first growing season; occasional deep watering once established | Pet-safe |
| Golden Angel's Trumpet | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (soil evenly moist; never waterlogged) | Toxic to pets |
| Golden Arch Dendrobium | Bright indirect light (just back from a sunny window) | Every 5-7 days in active growth; reduce to every 3-4 weeks 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 Chalice Vine | Direct sun (at least 4-6 hours) | Weekly in active growth; every 2–3 weeks in winter | Toxic to pets |
| Golden Jubilee Anise Hyssop | Direct sun (at least 4-6 hours) | Every 7–10 days once established; more frequent for newly planted specimens | Pet-safe |
| Golden 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-rayed Lily | Direct sun (at least 4-6 hours) | When top 3 cm of soil is dry | Toxic to pets |
| Gongora galeata | Bright indirect light (just back from a sunny window) | When the medium nears dryness in growth; sparingly during winter rest | Mildly toxic to pets |
| Gongora quinquenervis | Bright indirect light (just back from a sunny window) | When the medium approaches dryness, often every 2-4 days in growth | Mildly toxic to pets |
| Goumi | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; regularly while young, then only in dry spells | Pet-safe |
| Graham Thomas Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Grand Fir | Direct sun (at least 4-6 hours) | Weekly during establishment; rainfall-dependent once mature | Pet-safe |
| Grape-Scented Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Grasshopper Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; near-dry rest in winter | Pet-safe |
| Greater Sea Kale | Bright indirect light (just back from a sunny window) | Moderate — water regularly while establishing, then during dry spells | Mildly toxic to pets |
| Greek Bush Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Greek Sage | Direct sun (at least 4-6 hours) | Low; water when the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Greek Tree Sage | Direct sun (at least 4-6 hours) | Low — every 14–21 days in summer once established; very little in winter | Mildly toxic to pets |
| Green Cotton Lavender | Direct sun (at least 4-6 hours) | Low — water sparingly once established | Mildly toxic to pets |
| Green Lavender | Direct sun (at least 4-6 hours) | Low — allow soil to dry almost completely between waterings; water sparingly in winter | Toxic to pets |
| Green Shiso | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 2-4 days in summer | Toxic to pets |
| Greenspire Linden | Direct sun (at least 4-6 hours) | Moderate; deep watering during establishment and drought | Pet-safe |
| Grosso lavandin | Direct sun (at least 4-6 hours) | Weekly for the first season; every 3–4 weeks or less once established | Mildly toxic to pets |
| Grosso Lavender | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, about every 10-14 days once established | Toxic to pets |
| Grumichama | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil dries, roughly weekly; keep young plants evenly moist | Mildly toxic to pets |
| Guava | Direct sun (at least 4-6 hours) | Deeply every 5-10 days; keep evenly moist during flowering and fruiting, then allow brief dry spells | Mildly toxic to pets |
| Hairy Ginger Lily | Bright indirect light (just back from a sunny window) | Keep moist throughout active growth; water sparingly in winter | Pet-safe |
| Hairy Primrose | Bright indirect light (just back from a sunny window) | Regularly during active growth (spring–autumn); sparingly in winter | Toxic to pets |
| Hales Best Cantaloupe | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, about 25-30 mm | Pet-safe |
| Hamilton's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in autumn and winter | Pet-safe |
| Hand-Bearing Oncidium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Hansa Rose | Direct sun (at least 4-6 hours) | Water weekly while establishing; drought-tolerant once settled | Pet-safe |
| Harlow Carr Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in growth; more in heat or pots | Pet-safe |
| Hart's Pennyroyal | Bright indirect light (just back from a sunny window) | Keep consistently moist to wet; does not tolerate drying out | Mildly toxic to pets |
| Hawthorn | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; weekly while young, rarely once established | Pet-safe |
| Heart-Leaf Krohniana | Bright indirect light (just back from a sunny window) | When the top 1-2 inches (2-5 cm) of mix are dry | Pet-safe |
| Heart-Lipped Brassavola | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; reduce to every 7–10 days in cooler months | Pet-safe |
| 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 |
| Helmet-Shaped Gongora | Bright indirect light (just back from a sunny window) | Every 4–6 days when actively growing; reduce to every 10–14 days in winter | Pet-safe |
| Herald Trumpet Vine | Direct sun (at least 4-6 hours) | Water every 5-7 days in the growing season, ensuring the top 3-5 cm is slightly dry before watering; reduce significantly in winter to every 2-4 weeks | Mildly toxic to pets |
| Herald's Trumpet | Direct sun (at least 4-6 hours) | Every 5-7 days in growth, every 14 days in winter | Toxic to pets |
| Hidcote Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks (established plants) | Toxic to pets |
| Hinds' Torchwood | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; very rarely in winter dormancy | Mildly toxic to pets |
| Hindu rope plant | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days in growth | Pet-safe |
| Hindu Rope Plant | Bright indirect light (just back from a sunny window) | When the mix is mostly dry, every 10-14 days or longer | 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 |
| Holy Basil (Tulsi) | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in warm weather | Pet-safe |
| Hooded Dendrobium | Bright indirect light (just back from a sunny window) | Abundant in summer growth; nearly withheld over the deciduous winter rest | Pet-safe |
| Hooded-leaf Pelargonium | Direct sun (at least 4-6 hours) | Water when the top 3–4 cm of compost is dry, approximately every 7–12 days in the growing season; keep barely moist in winter | Toxic to pets |
| Hooker's Ginger Lily | Bright indirect light (just back from a sunny window) | Consistently moist in active growth (spring–autumn); reduce significantly in winter | 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 |
| Horned violet | Bright indirect light (just back from a sunny window) | Every 5–7 days; keep evenly moist | Pet-safe |
| Hosta 'August Moon' | Medium indirect light (a couple of metres from a window) | When the top 3 cm of soil is dry, roughly every 6-7 days in summer | Toxic to pets |
| Hosta 'Fragrant Bouquet' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 6-7 days in summer | Toxic to pets |
| Hosta 'Guacamole' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Hosta 'Invincible' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Hosta 'Remember Me' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Hosta 'Royal Standard' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Hosta 'Stained Glass' | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Hoya | Bright indirect light (just back from a sunny window) | When the soil is mostly dry, every 10-14 days | Pet-safe |
| Hoya 'Krimson Princess' | Bright indirect light (just back from a sunny window) | When the top half of the mix is dry, every 7-14 days | Pet-safe |
| Hoya 'Krimson Queen' | Bright indirect light (just back from a sunny window) | When the top half of the mix is dry, every 7-14 days | Pet-safe |
| Hoya 'Mathilde' | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Hoya 'Mathilde' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya 'Sunrise' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya Acuta | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Aff. Lanceolata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Aldrichii | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days | Pet-safe |
| Hoya Australis | Bright indirect light (just back from a sunny window) | when top 2-3 cm of soil dries | Pet-safe |
| Hoya Australis 'Lisa' | Bright indirect light (just back from a sunny window) | Roughly every 1-2 weeks; only when the top 1-2 inches of soil are dry | Pet-safe |
| Hoya Bella 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 5-9 days in growth | Pet-safe |
| Hoya Blashernaezii | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Cagayanensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Calycina | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Carnosa 'Rubra' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Carnosa Variegata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, about every 7-14 days | Pet-safe |
| Hoya caudata (Sumatra) | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in growth; every 2-3 weeks in winter | Pet-safe |
| Hoya Celata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Chouke | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Cinnamomifolia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of the mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Compacta | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days | Pet-safe |
| Hoya Compacta 'Regalis' | Bright indirect light (just back from a sunny window) | When the mix is dry to 4-5 cm down, about every 10-14 days | Pet-safe |
| Hoya Coriacea | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Cumingiana Yellow | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, roughly every 6-10 days in growth | Pet-safe |
| Hoya Cummingiana | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| Hoya curtisii | Bright indirect light (just back from a sunny window) | Roughly weekly in spring and summer; every 10-14 days in autumn and winter | Pet-safe |
| Hoya Davidcummingii | Bright indirect light (just back from a sunny window) | When the soil is nearly dry, roughly every 10-14 days | Pet-safe |
| Hoya Deykeae | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Erythrina | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Erythrostemma | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Flagellata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Flavida | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Fraterna | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-14 days in growth | Pet-safe |
| Hoya fungii | Bright indirect light (just back from a sunny window) | When the top 1-2 inches of mix are dry, roughly every 1-2 weeks | Pet-safe |
| Hoya Gracilis | Bright indirect light (just back from a sunny window) | When the mix is nearly or fully dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Greenii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Griffithii | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Halconensis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya heuschkeliana | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Incrassata | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Javanica | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Krimson Princess | Bright indirect light (just back from a sunny window) | Roughly every 1-2 weeks; let the soil dry almost completely first | Pet-safe |
| Hoya lacunosa | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in spring/summer; much less in autumn/winter | Pet-safe |
| Hoya Lacunosa 'Eskimo' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 6-10 days in growth | Pet-safe |
| Hoya Lambii | Bright indirect light (just back from a sunny window) | When the top 3 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Latifolia | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Leucorhoda | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Linearis | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Lobbii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, about every 7-10 days in growth | Pet-safe |
| Hoya Macrophylla 'Variegata' | 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 Meliflua | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Memoria (Gracilis) | Bright indirect light (just back from a sunny window) | Every 7-14 days in spring/summer; every 2-3 weeks in winter | Pet-safe |
| Hoya Mitrata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Nicholsoniae | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Obovata | Bright indirect light (just back from a sunny window) | When the top half of the mix is dry | Pet-safe |
| Hoya Odorata | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 7-10 days | Pet-safe |
| Hoya Onychoides | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Pachyclada | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is fully dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Pallida | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-9 days in growth | Pet-safe |
| Hoya Pandurata | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Praetorii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Pubescens | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya pubicalyx | Bright indirect light (just back from a sunny window) | When the top 2-3 cm is dry, roughly every 7-10 days in summer | Pet-safe |
| Hoya Pubicalyx 'Royal Hawaiian Purple' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Pubicalyx 'Silver Pink' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Pubicalyx 'Splash' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Rebecca | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of the mix is dry, roughly every 6-10 days in growth | Pet-safe |
| Hoya Retusa | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; reduce sharply in winter | Pet-safe |
| Hoya Rigida | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Rosarioae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Rosita | Bright indirect light (just back from a sunny window) | When the top 5 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Hoya Scortechinii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya sigillatis | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; let the top 1-2 inches (3-5 cm) of mix dry out first | Pet-safe |
| Hoya Siikfongensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Spartioides | Bright indirect light (just back from a sunny window) | When the mix is nearly dry throughout, roughly every 12-18 days | Pet-safe |
| Hoya Subcalva | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Sunrise | Bright indirect light (just back from a sunny window) | When the top of the mix is dry, roughly every 7-14 days | Pet-safe |
| Hoya Sussuela | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya Undulata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Hoya Vitellinoides | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of mix is dry, roughly every 10-14 days in growth | Pet-safe |
| Hoya Vitiensis | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of mix is dry, roughly every 7-12 days in growth | Pet-safe |
| Hoya wayetii | Bright indirect light (just back from a sunny window) | When the top inch of soil is dry | Pet-safe |
| Hyacinth | Bright indirect light (just back from a sunny window) | Weekly watering during growth | Toxic to pets |
| Hyacinth bean | Direct sun (at least 4-6 hours) | Water deeply 2–3 times per week during active growth; reduce to once weekly once established | Mildly toxic to pets |
| Hyacinthus orientalis 'Carnegie' | Direct sun (at least 4-6 hours) | Moist through growth and flowering; reduce after foliage dies back | Toxic to pets |
| Hyacinthus orientalis 'City of Haarlem' | Direct sun (at least 4-6 hours) | Moist during growth and flowering; reduce after foliage dies back | Toxic to pets |
| Hyacinthus orientalis 'Delft Blue' | Direct sun (at least 4-6 hours) | Keep soil moist during growth and flowering; reduce sharply after foliage dies back | Toxic to pets |
| Hyacinthus orientalis 'Jan Bos' | Direct sun (at least 4-6 hours) | Moist through growth and flowering; reduce after foliage dies back | Toxic to pets |
| Hyacinthus orientalis 'Woodstock' | Direct sun (at least 4-6 hours) | Moist during growth and flowering; much drier after dormancy sets in | Toxic to pets |
| Hyssop | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 1-2 weeks | Mildly toxic to pets |
| Iceberg Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Indian Sage | Direct sun (at least 4-6 hours) | Every 7–10 days during the growing season | Mildly toxic to pets |
| Indian Snap Ginger | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Mildly toxic to pets |
| Intrigue Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times weekly, about 4-5 litres per plant | Pet-safe |
| Irene Nuss Cane Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 5-7 days in summer | Toxic to pets |
| Iris 'Clarence' | Direct sun (at least 4-6 hours) | Keep moist through spring and late summer to support rebloom; do not waterlog | Toxic to pets |
| Iris 'Immortality' | Direct sun (at least 4-6 hours) | Keep evenly moist through spring and late summer to support rebloom; avoid waterlogging | Toxic to pets |
| Iris 'Jane Phillips' | Direct sun (at least 4-6 hours) | Water deeply during spring growth and after planting; keep drier in summer | Toxic to pets |
| Irish heath | Direct sun (at least 4-6 hours) | Weekly while establishing; every 2–3 weeks once established | Pet-safe |
| Irish Heath Irish Dusk | Direct sun (at least 4-6 hours) | Regular during establishment; moderate once settled | Mildly toxic to pets |
| Isabel Chan's Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in winter | Pet-safe |
| Italian jasmine | Bright indirect light (just back from a sunny window) | Every 7–14 days; drought-tolerant once established | Mildly toxic to pets |
| Itea virginica | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry spells, tolerant of wet ground | Mildly toxic to pets |
| Itea virginica 'Henry's Garnet' | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry weather, tolerant of wet ground | Mildly toxic to pets |
| Itea virginica 'Little Henry' | Bright indirect light (just back from a sunny window) | Keep soil moist; water weekly or more in dry spells, tolerant of wet ground | Mildly toxic to pets |
| Jacqueline Postill Daphne | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in the growing season, allowing the top 3-5 cm to dry between waterings | Toxic to pets |
| Japanese Apricot | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil dries, often daily in summer | Toxic to pets |
| Japanese Arborvitae | Direct sun (at least 4-6 hours) | Regular — keep soil evenly moist; do not allow to dry out completely | 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 Nutmeg Yew | Medium indirect light (a couple of metres from a window) | Every 7–10 days when establishing; established trees rely on rainfall with supplemental watering in dry spells | Mildly toxic to pets |
| Japanese Privet Bonsai | Direct sun (at least 4-6 hours) | When the top 1-2 cm of soil dries, often daily in summer | Toxic to pets |
| Japanese Rose | Direct sun (at least 4-6 hours) | Weekly while young, then drought-tolerant once established | Pet-safe |
| Japanese Show Lily | Bright indirect light (just back from a sunny window) | Regular during active growth, roughly every 5–7 days in dry spells; reduce after foliage dies back | Toxic to pets |
| Japanese Tree Lilac | Direct sun (at least 4-6 hours) | Weekly while young, then only in drought | Mildly toxic to pets |
| Japanese Tree Lilac | Direct sun (at least 4-6 hours) | Every 7-14 days during the first two seasons; drought-tolerant once established | Mildly toxic to pets |
| 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 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 |
| Jonquil | Direct sun (at least 4-6 hours) | Moderate during autumn–spring growth; very dry during summer dormancy | Toxic to pets |
| Jubilee Celebration Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Julia Child Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Just Joey Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while in growth | Pet-safe |
| Kaffir Lime | Direct sun (at least 4-6 hours) | Water when the top 3-5 cm of soil is dry, roughly every 5-10 days depending on warmth and pot size | Toxic to pets |
| Kahili Ginger | Bright indirect light (just back from a sunny window) | Water freely in spring and summer (every 3–5 days); reduce sharply in autumn and keep barely moist over winter | Mildly toxic to pets |
| Kamchatka Bugbane | Medium indirect light (a couple of metres from a window) | 2–3 times per week in growing season; weekly when dormant | Mildly toxic to pets |
| Katz Sakura stock | Direct sun (at least 4-6 hours) | Every 3–5 days; keep soil evenly moist but never waterlogged | Pet-safe |
| Kellerman's Begonia | Bright indirect light (just back from a sunny window) | When the top third of the soil is dry | Toxic to pets |
| Kentucky wisteria | Direct sun (at least 4-6 hours) | Weekly during the first growing season; drought-tolerant once established | Toxic to pets |
| Key lime | Direct sun (at least 4-6 hours) | Every 5-10 days in summer; every 10-14 days in cooler months | Mildly toxic to pets |
| 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 |
| Korean Mint | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly weekly in summer | Mildly toxic to pets |
| 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 |
| Kumquat | Direct sun (at least 4-6 hours) | When the top 2-5 cm of soil is dry, roughly every 5-10 days | Mildly toxic to pets |
| Laburnum × watereri 'Vossii' | Direct sun (at least 4-6 hours) | Water weekly through the first two seasons, then only in prolonged drought | Toxic to pets |
| Lady of the Night | Bright indirect light (just back from a sunny window) | Every 5–7 days; adjust based on season and soil moisture | Toxic to pets |
| Lady of the Night | Bright indirect light (just back from a sunny window) | When fully dry, roughly every 7-10 days | Pet-safe |
| Lady of the Night | Bright indirect light (just back from a sunny window) | Allow roots and medium to dry almost completely between waterings, roughly every 5-7 days in active growth and every 10-14 days in winter rest | Pet-safe |
| Lamb's Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; once monthly or less in winter | Mildly toxic to pets |
| Lamellate Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; every 3–4 days in cooler months | Pet-safe |
| Large Chain Orchid | Bright indirect light (just back from a sunny window) | Every 5-7 days during active growth; reduce to every 10-14 days in winter | Pet-safe |
| Large-Flowered Stanhopea | Bright indirect light (just back from a sunny window) | Frequently during growing season; reduce by half in winter | Pet-safe |
| Large-Leaf Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 10–14 days in winter | Pet-safe |
| Laurel-Leaved Rock Rose | Direct sun (at least 4-6 hours) | Every 3–4 weeks once established; weekly in the first season | Mildly toxic to pets |
| Lavandin | Direct sun (at least 4-6 hours) | Every 2–3 weeks during establishment; very little once established | Mildly toxic to pets |
| Lavandin | Direct sun (at least 4-6 hours) | When soil is dry several cm down, every 1-2 weeks while establishing, then rarely | Toxic to pets |
| Lavender | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 10-14 days | Toxic to pets |
| Lawi Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer, every 3–4 weeks in autumn and winter | Pet-safe |
| Lawrence's Coelogyne | Bright indirect light (just back from a sunny window) | Every 5-7 days during active growth; reduce to every 14-21 days in winter when temperatures are cooler | Pet-safe |
| Lemon balm | Medium indirect light (a couple of metres from a window) | Weekly watering | Pet-safe |
| Lemon Basil | Direct sun (at least 4-6 hours) | Every 2–3 days in warm conditions | Pet-safe |
| Lemon Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Lemon Bee Balm | Direct sun (at least 4-6 hours) | Water when the top few centimetres of soil are dry, roughly weekly, less once established | Mildly toxic to pets |
| Lemon Thyme | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Lemon Tree 'Eureka' | Direct sun (at least 4-6 hours) | When the top 2-5 cm of soil is dry, roughly every 5-10 days depending on heat and pot size | Toxic to pets |
| Lemon Tree 'Meyer' | Direct sun (at least 4-6 hours) | When the top 2-5 cm of soil is dry, roughly every 5-10 days | Toxic to pets |
| Lemon verbena | Direct sun (at least 4-6 hours) | Weekly watering | Toxic to pets |
| Lemon-Scented Ginger | Bright indirect light (just back from a sunny window) | Evenly moist during the growing season; almost dry during winter dormancy. | Mildly toxic to pets |
| Leskovac quince | Direct sun (at least 4-6 hours) | Weekly during dry periods; reduce in autumn | Pet-safe |
| Licorice Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Lilac 'Charles Joly' | Direct sun (at least 4-6 hours) | Weekly through the first season, then only in drought | Mildly toxic to pets |
| Lilium 'Black Beauty' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, roughly weekly in the growing season | Toxic to pets |
| Lilium 'Casa Blanca' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, about weekly during active growth | Toxic to pets |
| Lilium 'Conca d'Or' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, about weekly during growth | Toxic to pets |
| Lilium 'Dizzy' | Direct sun (at least 4-6 hours) | Keep evenly moist in growth, about weekly; never waterlogged | Toxic to pets |
| Lilium 'Regale' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, roughly weekly during active growth | Toxic to pets |
| Lilium 'Stargazer' | Direct sun (at least 4-6 hours) | When the top 3-5cm of soil is dry, roughly weekly during growth and flowering | Toxic to pets |
| Lilium 'Tiny Bee' | Direct sun (at least 4-6 hours) | When the top 2-3cm of soil is dry, roughly weekly; more often in pots | Toxic to pets |
| Lily of the valley | Low light (north window or shaded room) | Weekly watering | Toxic to pets |
| Lime Basil | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Lion's Angraecum | Bright indirect light (just back from a sunny window) | Every 2–4 days in summer, every 7–10 days in winter | Pet-safe |
| Liquorice Blue Korean Mint | Direct sun (at least 4-6 hours) | Every 5–7 days; reduce in winter | 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 |
| Long-feathered Aponogeton | Medium indirect light (a couple of metres from a window) | Permanently submerged; weekly 25–30% water changes | Pet-safe |
| Long-Flowered Chalice Vine | Direct sun (at least 4-6 hours) | Weekly during the growing season; fortnightly in winter | Toxic to pets |
| Long-Haired Zygopetalum | Bright indirect light (just back from a sunny window) | Every 3–4 days in growth, reduce to weekly in winter | Pet-safe |
| Long-Stemmed Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days; allow soil to dry fully | Pet-safe |
| Longcluster Japanese Wisteria | Direct sun (at least 4-6 hours) | Every 7–14 days during dry periods; established plants need little supplemental watering | Toxic to pets |
| Longleaf Phlox | Direct sun (at least 4-6 hours) | Every 14–21 days when establishing; minimal supplemental water once established | Pet-safe |
| Lonicera caprifolium | Direct sun (at least 4-6 hours) | Keep the root zone evenly moist; water deeply in dry spells, every 5-7 days in summer heat | Mildly toxic to pets |
| Lonicera japonica | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, around every 5-10 days while establishing | Mildly toxic to pets |
| Lonicera periclymenum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil dries, roughly every 5-10 days while establishing | Mildly toxic to pets |
| Lonicera periclymenum 'Serotina' | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil dries, roughly every 5-10 days while establishing | Mildly toxic to pets |
| Lonicera x heckrottii | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil dries, about every 5-10 days while establishing | Mildly toxic to pets |
| 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 |
| Lupin 'The Governor' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Luzon Vanda | Bright indirect light (just back from a sunny window) | Daily to every 2 days in active growth; reduce slightly in cooler months | Pet-safe |
| Ly's Wax Plant | Medium indirect light (a couple of metres from a window) | Every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Lycaste aromatica | Bright indirect light (just back from a sunny window) | Every 4-6 days while in leaf; sparingly once leaves drop | Pet-safe |
| Lychee | Direct sun (at least 4-6 hours) | Keep evenly moist in growth; water when the top 3-5 cm dries | Mildly toxic to pets |
| MacGillivray's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer, very sparingly in winter | Pet-safe |
| 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 |
| Mackay's Zygopetalum | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of the mix is dry, roughly every 7-10 days in summer | 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 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 Lily | Direct sun (at least 4-6 hours) | Moderate; water during active growth, reduce as dormancy approaches | Toxic to pets |
| Magdalene Angraecum | Bright indirect light (just back from a sunny window) | Regular watering spring–autumn; reduce markedly in winter | Pet-safe |
| Magnolia 'Elizabeth' | Direct sun (at least 4-6 hours) | Weekly during the first few years and in summer droughts | Pet-safe |
| Magnolia '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 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 |
| Maikai Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow medium to dry out between waterings | Pet-safe |
| Malabar Quisqualis | Direct sun (at least 4-6 hours) | Every 3–5 days during dry periods; reduce in cool or wet seasons | Mildly toxic to pets |
| Mamey Apple | Direct sun (at least 4-6 hours) | 2–3 times per week; reduce in winter | Mildly toxic to pets |
| Manna Ash | Direct sun (at least 4-6 hours) | Low to moderate; drought-tolerant once established | Pet-safe |
| Mara des Bois Strawberry | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days in summer | Pet-safe |
| Mara des Bois Strawberry | Direct sun (at least 4-6 hours) | Every 3–5 days during active growth and fruiting; reduce in dormancy | Pet-safe |
| Marang | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil begins to dry, often every 3-6 days in warm growth | Mildly toxic to pets |
| Marsh Afrikaner | Direct sun (at least 4-6 hours) | Moderate during winter–spring growing season; withhold entirely once foliage dies back in summer | Toxic to pets |
| Marshall's Thunia | Bright indirect light (just back from a sunny window) | Water freely every 2-4 days during vigorous summer growth; reduce sharply from autumn as leaves yellow, then keep almost dry (monthly) through winter dormancy | Pet-safe |
| Martius's Brassavola | Bright indirect light (just back from a sunny window) | Every 5–7 days during growing season; reduce in winter after flowering | Pet-safe |
| Martius's Stanhopea | Bright indirect light (just back from a sunny window) | 3–5 times per week in summer; sharply reduce in winter | Pet-safe |
| Mary's Prosthechea | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; every 14-21 days in winter | Pet-safe |
| Maxillaria picta | Medium indirect light (a couple of metres from a window) | Water when the surface dries, about every 4-7 days; reduce somewhat after flowering | Mildly toxic to pets |
| Meech's Prolific quince | Direct sun (at least 4-6 hours) | Weekly during summer; reduce from early autumn | Pet-safe |
| Merrill's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer, every 14–21 days in winter | Pet-safe |
| Mexican Cypress | Direct sun (at least 4-6 hours) | Weekly during establishment; fortnightly in dry periods once mature | Mildly toxic to pets |
| Mexican Hyssop | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, about every 5-7 days; less once established | Mildly toxic to pets |
| 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 |
| Midas Touch Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Mignonette | Direct sun (at least 4-6 hours) | Every 5–7 days; do not allow to dry out completely | Pet-safe |
| Mignonette Alpine Strawberry | Direct sun (at least 4-6 hours) | Keep consistently moist; water 2-3 times a week in heat | Pet-safe |
| Mignonette Alpine Strawberry | Bright indirect light (just back from a sunny window) | Every 2–3 days in growing season; weekly in cool or dormant periods | Pet-safe |
| Mignonette Peperomia | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; every 2–3 weeks in winter | Pet-safe |
| 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 |
| Miss Kim Lilac | Direct sun (at least 4-6 hours) | Weekly to establish, then occasional deep watering in drought | Mildly toxic to pets |
| Mister Lincoln Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Mock Orange | Direct sun (at least 4-6 hours) | Water in dry spells; drought-tolerant once established | Mildly toxic to pets |
| Mock Orange 'Belle Etoile' | Direct sun (at least 4-6 hours) | Weekly while establishing; during dry spells thereafter | Mildly toxic to pets |
| Mockernut Hickory | Direct sun (at least 4-6 hours) | Water young trees in dry spells; mature trees are drought-tolerant | Pet-safe |
| Monarda Cambridge Scarlet | Direct sun (at least 4-6 hours) | Keep soil evenly moist, watering deeply once or twice a week and more in heat | Mildly toxic to pets |
| Monarda Croftway Pink | Direct sun (at least 4-6 hours) | Maintain steady soil moisture, watering deeply once or twice weekly and more in dry heat | Mildly toxic to pets |
| Mongolian Linden | Bright indirect light (just back from a sunny window) | Weekly during establishment; every 2 weeks in dry summers | Pet-safe |
| Moonflower | Direct sun (at least 4-6 hours) | Weekly, more often in hot or dry spells | Toxic to pets |
| Moonlight Cactus | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, roughly weekly in summer and around monthly in winter | Pet-safe |
| Moore's Coelogyne | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; every 14-21 days in winter | Pet-safe |
| Morelia Miltonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of the mix feels barely moist, roughly every 6-8 days in summer | Pet-safe |
| Moroccan Lavender | Direct sun (at least 4-6 hours) | Low — water only when the top 2–3 cm of soil is dry; withhold almost entirely in winter | Toxic to pets |
| Moss-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Pet-safe |
| Mountain Alyssum | Direct sun (at least 4-6 hours) | Every 14–21 days during growth; minimal in winter | Pet-safe |
| Mountain Germander | Direct sun (at least 4-6 hours) | Rarely once established; water during dry spells in the first season | Mildly toxic to pets |
| Mountain Lemon Thyme | Direct sun (at least 4-6 hours) | Low — water sparingly; drought-tolerant once established | Pet-safe |
| Mountain Mint | Direct sun (at least 4-6 hours) | Keep evenly moist; water weekly until established, then during dry spells | Mildly toxic to pets |
| Mountain Papaya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Mildly toxic to pets |
| Mountain Sweet Pitcher Plant | Direct sun (at least 4-6 hours) | Tray method, moist year-round | 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 Lavender | Direct sun (at least 4-6 hours) | When soil is dry several centimetres down, roughly every 10-14 days, seldom once established | Toxic to pets |
| Munstead Wood Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Muscari armeniacum | Direct sun (at least 4-6 hours) | Rainfall in most settings; water in dry spring spells | Pet-safe |
| Muscat grape | Direct sun (at least 4-6 hours) | Weekly when establishing; every 10–14 days once mature | Mildly toxic to pets |
| Muscat of Alexandria Grape | Direct sun (at least 4-6 hours) | Steady deep watering through growth and fruit set; reduce as berries ripen | Toxic to pets |
| Musk Mallow | Direct sun (at least 4-6 hours) | Low to moderate once established | Pet-safe |
| Musk Stork's Bill | Direct sun (at least 4-6 hours) | Water moderately during active growth; keep nearly dry in dormancy | Mildly toxic to pets |
| Muster-John-Henry | Direct sun (at least 4-6 hours) | Once or twice weekly; allow the top 3 cm of soil to dry between waterings | Mildly toxic to pets |
| Mystacid Aerangis | Bright indirect light (just back from a sunny window) | When roots appear silvery-white and the top of the medium is dry, roughly every 5-8 days | Pet-safe |
| nannyberry | Bright indirect light (just back from a sunny window) | Weekly for first two seasons; infrequently once established | Mildly toxic to pets |
| Narcissus 'Minnow' | Direct sun (at least 4-6 hours) | Evenly moist while in leaf and flower; dry in summer dormancy | Toxic to pets |
| Narcissus 'Pipit' | Direct sun (at least 4-6 hours) | Moist in spring growth; drier through summer dormancy | Toxic to pets |
| Narcissus 'Thalia' | Direct sun (at least 4-6 hours) | Moist in spring growth; drier through summer dormancy | Toxic to pets |
| Narrow Rib Cereus | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; once a month or less in winter | Mildly toxic to pets |
| Narrow-leaved Sage | Direct sun (at least 4-6 hours) | Every 10–14 days once established | Pet-safe |
| Narrow-petal Frangipani | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter dormancy | Toxic to pets |
| Natal Plum Bonsai | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 3-6 days in growth | Pet-safe |
| Neglected Pink | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry between waterings | Toxic to pets |
| Nelumbo nucifera | Direct sun (at least 4-6 hours) | Permanently submerged rhizome in still water with warm emergent growth | Mildly toxic to pets |
| Nemesia 'Sunsatia Cranberry' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather | Pet-safe |
| Nepeta 'Six Hills Giant' | Direct sun (at least 4-6 hours) | When soil is dry to a few centimetres; infrequently once established | Mildly toxic to pets |
| Netted Iris | Direct sun (at least 4-6 hours) | Low — dry in summer dormancy; moderate when in growth | Toxic to pets |
| Netted Muskmelon | Direct sun (at least 4-6 hours) | 2–3 times per week; reduce significantly 1–2 weeks before harvest | Pet-safe |
| Nettleleaf Giant Hyssop | Direct sun (at least 4-6 hours) | Every 5–7 days in the growing season; less in winter | Pet-safe |
| 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 |
| Nicotiana alata 'Perfume Deep Purple' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Toxic to pets |
| Nicotiana sylvestris | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-6 days | Toxic to pets |
| Night-Blooming Cereus | Bright indirect light (just back from a sunny window) | When the top few cm of mix is dry, roughly every 1-2 weeks in growth | Pet-safe |
| Night-blooming Jasmine | Bright indirect light (just back from a sunny window) | Every 5–7 days during active growth; reduce to every 10–14 days in cooler months | Toxic to pets |
| Night-Scented Epidendrum | Bright indirect light (just back from a sunny window) | Every 4–5 days in growth; every 7–10 days in cool or dry periods | Pet-safe |
| Night-scented stock | Direct sun (at least 4-6 hours) | Every 7–10 days; allow soil to dry between waterings | Pet-safe |
| Nivalis flowering quince | Bright indirect light (just back from a sunny window) | Weekly during establishment; rainfall usually sufficient once established | Mildly toxic to pets |
| Noble Dendrobium (miniature form) | Bright indirect light (just back from a sunny window) | Every 5-7 days in summer; every 14-21 days in the winter rest period | Pet-safe |
| Nootka Cypress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Mildly toxic to pets |
| Nottingham Catchfly | Bright indirect light (just back from a sunny window) | Low; allow soil to dry between waterings | Mildly toxic to pets |
| 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 |
| Nutmeg Geranium | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 5-7 days while growing | Toxic to pets |
| Nymphaea 'Firecrest' | Direct sun (at least 4-6 hours) | Permanently submerged in still water | Mildly toxic to pets |
| Nymphaea 'Marliacea Albida' | Direct sun (at least 4-6 hours) | Permanently submerged; keep pond level steady | Mildly toxic to pets |
| Nymphaea 'Marliacea Carnea' | Direct sun (at least 4-6 hours) | Permanently submerged; keep pond level steady | Mildly toxic to pets |
| Nymphaea 'Perry's Fire Opal' | Direct sun (at least 4-6 hours) | Permanently submerged; keep pond level steady | Mildly toxic to pets |
| Nymphaea capensis | Direct sun (at least 4-6 hours) | Permanently submerged in warm still water | Mildly toxic to pets |
| Oblong-Leaved Santolina | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Obscura Wax Plant | Bright indirect light (just back from a sunny window) | Every 10-14 days in growth; every 2-3 weeks in winter | Pet-safe |
| Ochre Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to once every 2–3 weeks in winter rest | Pet-safe |
| Ogon Sweet Flag | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; water whenever the surface begins to feel barely damp | Mildly toxic to pets |
| 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 |
| Only the Lonely Tobacco Plant | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| 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 |
| 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 |
| Oxydendrum arboreum | Direct sun (at least 4-6 hours) | Weekly while establishing; regular watering in dry spells | Mildly toxic to pets |
| Padang Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in growth; every 3–4 weeks in winter | Pet-safe |
| Paddle Plant (Flapjacks) | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Paeonia lactiflora 'Festiva Maxima' | Direct sun (at least 4-6 hours) | Deeply about once a week during the growing season; less once dormant | Toxic to pets |
| Paeonia lactiflora 'Karl Rosenfield' | Direct sun (at least 4-6 hours) | Deeply about once a week during active growth; reduce after dormancy | Toxic to pets |
| Pagoda Dogwood | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply weekly in the first two seasons and during droughts | Pet-safe |
| Painted Daisy | Direct sun (at least 4-6 hours) | Weekly during active growth; reduce after flowering and in winter | Mildly toxic to pets |
| Painted Lady sweet pea | Direct sun (at least 4-6 hours) | Every 3–5 days; daily in hot weather | Toxic to pets |
| Palibin Dwarf Korean Lilac | Direct sun (at least 4-6 hours) | Every 7-10 days during dry spells; drought-tolerant once established | Mildly toxic to pets |
| Palinha's Rock Rose | Direct sun (at least 4-6 hours) | Low — drought-tolerant once established | Mildly toxic to pets |
| Palmarosa | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 5-10 days depending on temperature | Pet-safe |
| Palo Santo | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Panama Queen | Bright indirect light (just back from a sunny window) | Every 5–7 days during the growing season; reduce in winter | Pet-safe |
| Panama Rose Shrub | Direct sun (at least 4-6 hours) | Once per week during dry seasons; minimal during wet seasons | Mildly toxic to pets |
| Pandacaqui | Bright indirect light (just back from a sunny window) | Every 5–7 days; allow soil to partially dry between waterings | Toxic to pets |
| Pandan | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 4-7 days | Mildly toxic to pets |
| 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 |
| Paperwhite Narcissus | Bright indirect light (just back from a sunny window) | Keep roots consistently moist during forcing; reduce after flowering | Toxic to pets |
| Parkinson's Epidendrum | Bright indirect light (just back from a sunny window) | Every 3–5 days in active growth; reduced in winter | Pet-safe |
| Passiflora 'Incense' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, every 3-5 days in summer heat | Mildly toxic to pets |
| Passiflora alata | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 4-7 days in active growth | Mildly toxic to pets |
| Passiflora quadrangularis | Direct sun (at least 4-6 hours) | When the top few cm of soil dry out, often every 3-5 days in active growth and fruiting | Mildly toxic to pets |
| Pat Austin Rose | Direct sun (at least 4-6 hours) | Deeply once or twice a week in the growing season, increasing in hot, dry spells | Pet-safe |
| Paul's Himalayan Musk Rose | Direct sun (at least 4-6 hours) | Deep soak weekly through the first two growing seasons; established plants rarely need watering | Pet-safe |
| Paulownia tomentosa | Direct sun (at least 4-6 hours) | Water weekly while establishing in the first two seasons, then rely largely on rainfall | Mildly toxic to pets |
| Paz's Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-14 days in active growth; every 14-21 days in winter | Pet-safe |
| Peace Rose | Direct sun (at least 4-6 hours) | Deeply 1-2 times per week, more in heat | Pet-safe |
| Pelargonium 'Chocolate Mint' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-8 days | Toxic to pets |
| Pelargonium 'Clorinda' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, about every 7-10 days in active growth | Toxic to pets |
| Pelargonium 'Copthorne' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, around every 7-10 days in active growth | Toxic to pets |
| Pelargonium 'Fair Ellen' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, about every 7-10 days in growth | Toxic to pets |
| Pelargonium 'Fragrans Variegatum' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, around every 7-10 days in growth | Toxic to pets |
| Pelargonium 'Fragrans' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, about every 7-10 days in growth | Toxic to pets |
| Pelargonium 'Ginger' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, about every 7-10 days in growth | Toxic to pets |
| Pelargonium 'Lara Starshine' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium 'Lemon Fancy' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost dries, roughly every 7-10 days in growth | Toxic to pets |
| Pelargonium 'Mabel Grey' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, about every 7-10 days in growth | Toxic to pets |
| Pelargonium 'Madame Layal' | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of compost dries, about every 5-9 days in summer | Toxic to pets |
| Pelargonium 'Prince of Orange' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, about every 7-10 days in growth | Toxic to pets |
| Pelargonium 'Snowflake' | 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 | Toxic to pets |
| Pelargonium 'Solferino' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 5-10 days in growth | Toxic to pets |
| Pelargonium capitatum | Direct sun (at least 4-6 hours) | When the top 3-4 cm of compost is dry, roughly every 7-12 days in growth | Toxic to pets |
| Pelargonium citronellum | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Pelargonium crispum 'Variegatum' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Pelargonium gibbosum | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth; much less in summer dormancy | Toxic to pets |
| Pelargonium graveolens 'Attar of Roses' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Pelargonium graveolens 'Grey Lady Plymouth' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 7-12 days | Toxic to pets |
| Pelargonium odoratissimum | Direct sun (at least 4-6 hours) | When the top 2-3 cm of compost is dry, roughly every 7-10 days in growth | Toxic to pets |
| Pelargonium quercifolium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 7-12 days in growth | Toxic to pets |
| Penny Mountain Thyme | Direct sun (at least 4-6 hours) | Every 7–14 days once established; drought-tolerant | Pet-safe |
| Peony 'Sarah Bernhardt' | Direct sun (at least 4-6 hours) | Deeply once a week during active growth and budding, more in drought; reduce after flowering and through dormancy | Toxic to pets |
| Peperomia fraseri | Bright indirect light (just back from a sunny window) | When the top third of the soil is dry, roughly every 7-10 days | Pet-safe |
| Peperomia nivalis | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 7-14 days in growth | Pet-safe |
| Percival's Cattleya | Bright indirect light (just back from a sunny window) | Every 7-10 days in active growth; reduce to every 14-21 days after pseudobulbs mature in autumn | Pet-safe |
| Pereskia aculeata | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-10 days in active growth | 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 Pamianthe | Bright indirect light (just back from a sunny window) | Water regularly during growth; reduce significantly after flowering | Toxic to pets |
| 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 'Liodoro' | Bright indirect light (just back from a sunny window) | About every 7-10 days, when the bark begins to dry and roots silver over | Pet-safe |
| Phalaenopsis violacea | Bright indirect light (just back from a sunny window) | When the bark mix is nearly dry, roughly every 5-7 days | Pet-safe |
| Philadelphus 'Snowbelle' | Direct sun (at least 4-6 hours) | Weekly while establishing, then in dry spells | Mildly toxic to pets |
| Philadelphus 'Virginal' | Direct sun (at least 4-6 hours) | Weekly while establishing, then occasional deep watering | Mildly toxic to pets |
| Philadelphus microphyllus | Direct sun (at least 4-6 hours) | Occasional deep soak once established | Mildly toxic to pets |
| Philippine Wax Flower | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil begins to dry, roughly every 5-7 days | Mildly toxic to pets |
| 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 |
| Pigeon Orchid | Bright indirect light (just back from a sunny window) | Frequently in warm growth, allowing brief drying between waterings | Pet-safe |
| Pincushion flower | Direct sun (at least 4-6 hours) | Once or twice weekly | Pet-safe |
| Pine-scented Pelargonium | Direct sun (at least 4-6 hours) | Water every 7-10 days in active growth; every 3-4 weeks or less in winter | Toxic to pets |
| Pine-scented Wax Plant | Bright indirect light (just back from a sunny window) | Every 7–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Pineapple | Direct sun (at least 4-6 hours) | Every 7–10 days in summer; every 14–21 days in winter | Mildly toxic to pets |
| Pineapple Mint | Bright indirect light (just back from a sunny window) | Every 2–3 days in warm weather; every 5–7 days in cool seasons | Mildly toxic to pets |
| Pineapple Sage | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 5-7 days in summer | Pet-safe |
| Pink Arisaema | Low light (north window or shaded room) | Keep moist through the growing season once growth appears, watering when the surface dries; reduce sharply as the leaf dies back to dormancy. | Toxic to pets |
| Pink Ice Plant | Direct sun (at least 4-6 hours) | Weekly in spring and summer growing season; every 2–3 weeks in autumn; rarely in winter | Mildly toxic to pets |
| Pink Moth Orchid | Bright indirect light (just back from a sunny window) | When the bark approaches dryness, typically every 7-10 days | Pet-safe |
| Pink Rock Orchid | Bright indirect light (just back from a sunny window) | When the potting medium is nearly dry, roughly every 5-7 days in summer; reduce to every 14-21 days in winter to trigger blooming | Pet-safe |
| Pink Trumpet Vine | Direct sun (at least 4-6 hours) | Every 7 days in summer; every 14–21 days in winter | Mildly toxic to pets |
| Pinwheel Flower | Bright indirect light (just back from a sunny window) | Once or twice per week during active growth; reduce in winter | Toxic to pets |
| Pitomba | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil dries, roughly weekly; keep young plants more consistently moist | Mildly toxic to pets |
| PJM rhododendron | Bright indirect light (just back from a sunny window) | Weekly during establishment and dry spells; every 2 weeks once established | Toxic to pets |
| Playboy Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | Pet-safe |
| Poet's Narcissus | Bright indirect light (just back from a sunny window) | Moderate to regular during growth; tolerates more moisture than most narcissi; drier in summer | Toxic to pets |
| Poet's Narcissus | Direct sun (at least 4-6 hours) | Once or twice weekly during active growth; allow to dry after foliage dies back | Toxic to pets |
| Pointed-Leaf Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; every 3–4 weeks in winter | Pet-safe |
| Pompona Vanilla | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of the growing medium feels dry, roughly every 7-10 days in summer | Pet-safe |
| 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 |
| Pot Marjoram | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, roughly every 1-2 weeks | Toxic to pets |
| Potts Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-10 days in summer; every 14-21 days in winter | Pet-safe |
| Prairie Dropseed | Direct sun (at least 4-6 hours) | Water regularly the first year to establish, then only in extended drought, roughly every 2-3 weeks | Mildly toxic to pets |
| Pride of Brazil Orchid | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth (spring–summer); every 14–21 days during the winter rest | Pet-safe |
| 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 |
| Prosperity Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season, more in heat | Pet-safe |
| Provence Lavender | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days once established | Toxic to pets |
| Prunus padus | Direct sun (at least 4-6 hours) | Water regularly while establishing; mature trees rarely need irrigation except in extended drought | Toxic to pets |
| Purple Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist sparingly 1–2 times weekly | Pet-safe |
| Purple Cyclamen | Medium indirect light (a couple of metres from a window) | Low in summer, moderate during active growth (late summer to spring) | Toxic to pets |
| Purple-flowered Sage | Bright indirect light (just back from a sunny window) | Moderate; water when the top 3–5 cm of soil is dry | Mildly toxic to pets |
| 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 |
| Queen Elizabeth Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly, when the top few centimetres of soil are dry | Pet-safe |
| Queen of Orchids | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; reduce to every 14–21 days during autumn-winter rest | 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 |
| Queen of the Night Cereus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer and every 4-6 weeks in winter | Pet-safe |
| Quince | Direct sun (at least 4-6 hours) | Deep soak weekly in the first two seasons and during fruit swell; established trees only in prolonged drought | Mildly toxic to pets |
| Quince 'Smyrna' | Direct sun (at least 4-6 hours) | Deeply every 7-14 days in the growing season; rely on rainfall once established | Mildly toxic to pets |
| Quince Vranja | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry; water young and fruiting trees in dry spells | Mildly toxic to pets |
| Rangoon Creeper | Direct sun (at least 4-6 hours) | Regularly during active growth — roughly every 3–5 days; reduce in winter | Mildly toxic to pets |
| Rayed Prosthechea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of bark is dry, roughly every 7-10 days | Pet-safe |
| Red Bee Balm | Bright indirect light (just back from a sunny window) | Every 1–2 weeks once established; more frequent during establishment | Pet-safe |
| Red Creeping Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days once established; more frequent watering for new plantings | Pet-safe |
| Red escallonia | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once established | Mildly toxic to pets |
| Red Frangipani | Direct sun (at least 4-6 hours) | Water deeply when the soil is dry to touch (roughly every 7–10 days in summer); withhold almost completely in winter dormancy | Mildly toxic to pets |
| Red Mistletoe 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 |
| Red Tube Pitcher | Direct sun (at least 4-6 hours) | Keep growing medium permanently moist using a tray of 2-4 cm of rainwater at all times during the growing season | Pet-safe |
| Regel's Sage | Direct sun (at least 4-6 hours) | Moderate; approximately 2.5 cm (1 inch) per week | Pet-safe |
| Regnell's Miltonia | Bright indirect light (just back from a sunny window) | Every 3–4 days in growth, reduce in winter | Pet-safe |
| Reichenbach's Air Plant | Bright indirect light (just back from a sunny window) | Soak 20–30 minutes once a week; mist 2–3 times weekly | Pet-safe |
| Resurrection Lily | Medium indirect light (a couple of metres from a window) | Every 5–7 days during the growing season; withhold almost completely in winter dormancy | Pet-safe |
| Rhododendron 'PJM' | Bright indirect light (just back from a sunny window) | Keep evenly moist; water deeply 1-2 times weekly in dry spells, more in heat | Toxic to pets |
| 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 |
| Rhynchostylis gigantea | Bright indirect light (just back from a sunny window) | Daily or every other day in warm growth for bare roots; reduce to a few times weekly in the cooler rest | Mildly toxic to pets |
| Rhynchostylis retusa | Bright indirect light (just back from a sunny window) | Daily or every other day in warm growth for bare roots; slightly less in cooler weather | Mildly toxic to pets |
| Ric Rac Cactus | Bright indirect light (just back from a sunny window) | When the top 2-4 cm of compost is dry, roughly every 7-10 days in summer | Pet-safe |
| Robinia pseudoacacia 'Frisia' | Direct sun (at least 4-6 hours) | Water weekly while establishing, then rely on rainfall | Toxic to pets |
| Rock Lily | Bright indirect light (just back from a sunny window) | Every 5–10 days during active growth; reduce significantly in winter rest | Pet-safe |
| Rocket candytuft | Direct sun (at least 4-6 hours) | Every 7–14 days; keep moist during establishment, reduce once rooted | Pet-safe |
| Roman Chamomile | Direct sun (at least 4-6 hours) | When the top few cm of soil dry out, roughly weekly once established | Toxic to pets |
| Roman Wormwood | Direct sun (at least 4-6 hours) | Every 3–4 weeks; allow soil to dry fully between waterings | Mildly toxic to pets |
| Rose Geranium | Direct sun (at least 4-6 hours) | Water every 6-10 days in the growing season; reduce significantly in winter | Toxic to pets |
| Rose-Scented Geranium | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 7-10 days | Toxic to pets |
| Rosemary | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Roseraie de l'Hay Rose | Direct sun (at least 4-6 hours) | Weekly during establishment; drought-tolerant once settled | Pet-safe |
| Rough Coelogyne | Bright indirect light (just back from a sunny window) | Every 3–5 days in active growth; reduce slightly in winter | Pet-safe |
| Round-leaved Wintergreen | Medium indirect light (a couple of metres from a window) | Keep consistently moist; water whenever the top 1–2 cm of soil begins to dry | Mildly toxic to pets |
| Royal Azalea | Bright indirect light (just back from a sunny window) | Every 5-7 days in the growing season; reduce after leaf drop | Toxic to pets |
| Royal Star Magnolia | Direct sun (at least 4-6 hours) | Weekly while young; in summer droughts for established shrubs | 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 Tarragon | Direct sun (at least 4-6 hours) | Every 7–10 days | Toxic to pets |
| Sacred Buddhist | Direct sun (at least 4-6 hours) | Every 2–4 days in summer (or as soon as the soil surface begins to dry); less frequently in winter | Toxic to pets |
| Saffron Air Plant | Direct sun (at least 4-6 hours) | Twice weekly in summer, once weekly in winter | Pet-safe |
| Sage | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 7-14 days | Pet-safe |
| Sakhalin Fir | Direct sun (at least 4-6 hours) | Moderate; water regularly during establishment | Pet-safe |
| Sally Holmes Rose | Direct sun (at least 4-6 hours) | Deep watering once or twice weekly | Pet-safe |
| Salvia yangii | Direct sun (at least 4-6 hours) | When top 5 cm of soil is dry, roughly every 10-14 days once established | Mildly toxic to pets |
| Sand Pink | Direct sun (at least 4-6 hours) | Low; water only when soil is completely dry, roughly every 2–3 weeks in the growing season | Mildly toxic to pets |
| Sander's Maxillaria | Bright indirect light (just back from a sunny window) | When the top 2 cm of the mix feels dry, roughly every 5-7 days | Pet-safe |
| Sansevieria Hyacinthoides | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Longiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Parva | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days in summer | Toxic to pets |
| Sarcochilus falcatus | Bright indirect light (just back from a sunny window) | Water every 2-3 days, keeping the roots moist but well aired | Pet-safe |
| Sarcococca confusa | Low light (north window or shaded room) | Water regularly to establish; afterwards every 7-14 days during dry spells | Mildly toxic to pets |
| Sarcococca Humilis | Low light (north window or shaded room) | Water regularly to establish; thereafter every 7-14 days in prolonged dry spells | Mildly toxic to pets |
| Sardinian Santolina | Direct sun (at least 4-6 hours) | Low — highly drought-tolerant once established | Mildly toxic to pets |
| Sarracenia flava var. ornata | Direct sun (at least 4-6 hours) | Keep constantly wet, standing in 1-3 cm of water through the growing season | Mildly toxic to pets |
| 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 |
| Savanna Gardenia | Direct sun (at least 4-6 hours) | Every 10–14 days during the growing season; every 21–28 days in dry season | Mildly toxic to pets |
| Scabrosa Rugosa Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant afterwards | Pet-safe |
| Scarlet Bee Balm | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry; often twice weekly in summer heat | Mildly toxic to pets |
| 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 |
| Scott's Angraecum | Bright indirect light (just back from a sunny window) | Daily during growing season (approx. 10 months), every other day in December–January | Pet-safe |
| Sea Stock | Direct sun (at least 4-6 hours) | Weekly during active growth (allow surface to dry slightly between waterings) | 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 |
| Selenicereus anthonyanus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 7-10 days in summer | Pet-safe |
| Serpens Wax Plant | Bright indirect light (just back from a sunny window) | Every 7-10 days in growth; far less in winter | Pet-safe |
| Seven-Spined Discocactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, approximately every 10-14 days in the growing season; once a month or less in winter | Pet-safe |
| Seville orange | Direct sun (at least 4-6 hours) | Every 7-14 days in summer; every 14-21 days in winter | Mildly toxic to pets |
| Seville Orange | Direct sun (at least 4-6 hours) | When the top 2-5 cm of soil is dry, roughly every 5-10 days | Toxic to pets |
| Shampoo Ginger | Bright indirect light (just back from a sunny window) | Every 3–5 days in the growing season; minimal to none during winter dormancy | Pet-safe |
| Shining fetterbush | Bright indirect light (just back from a sunny window) | Consistently moist to wet — do not allow prolonged drought | Toxic to pets |
| Shiny Thyme | Direct sun (at least 4-6 hours) | Every 10–14 days; drought-tolerant once established | Pet-safe |
| Shiso (Perilla) | Direct sun (at least 4-6 hours) | Roughly every 2-4 days; whenever the top 2-3 cm of soil feels dry | Mildly toxic to pets |
| Showy Japanese Lily | Bright indirect light (just back from a sunny window) | When top 2–3 cm of soil is dry | Toxic to pets |
| Showy Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; once every 2–4 weeks during dry rest | Pet-safe |
| Showy Sinningia | Bright indirect light (just back from a sunny window) | Keep soil slightly moist during growth; dry off in autumn | Pet-safe |
| Siberian Fir | Direct sun (at least 4-6 hours) | Moderate; relies on snowmelt and seasonal rain | Pet-safe |
| Sierra Leucothoe | Medium indirect light (a couple of metres from a window) | Regularly; do not allow to dry out between waterings | Toxic to pets |
| Signet Marigold 'Lemon Gem' | Direct sun (at least 4-6 hours) | When top 2-3 cm of soil is dry, every 4-7 days; containers more often | Mildly toxic to pets |
| Silky wisteria | Direct sun (at least 4-6 hours) | Weekly during growing season; reduce in winter | Toxic to pets |
| Silver Tansy | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; more frequent only when young | Mildly toxic to pets |
| Singapore Plumeria | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; very sparingly in winter | Toxic to pets |
| Singapore Yellow Frangipani | Direct sun (at least 4-6 hours) | Weekly to fortnightly during active growth; very sparingly in winter dormancy | Toxic to pets |
| 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 |
| Skimmia japonica Kew White | Medium indirect light (a couple of metres from a window) | Maintain consistently moist soil; water deeply every 5-7 days in dry weather | Mildly toxic to pets |
| Skimmia japonica Rubella | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply every 5-7 days in dry spells, less in cool months | Mildly toxic to pets |
| Skimmia Pabella | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply every 5-7 days in dry spells | Mildly toxic to pets |
| Skimmia Temptation | Medium indirect light (a couple of metres from a window) | Keep soil evenly moist; water deeply every 5-7 days during dry periods | Mildly toxic to pets |
| Sky Lupine | Direct sun (at least 4-6 hours) | Low; winter rainfall sufficient in most California climates; light supplemental water in February–March extends bloom | Toxic to pets |
| Slender Ginger Lily | Bright indirect light (just back from a sunny window) | Consistently moist in the growing season; reduce sharply in winter | Pet-safe |
| Slow-bolt Cilantro | Bright indirect light (just back from a sunny window) | Every 2–3 days, or when the top inch of soil feels dry | Pet-safe |
| Smooth Oregano | Direct sun (at least 4-6 hours) | Every 7–14 days (growing season); every 3–5 weeks (winter) | Mildly toxic to pets |
| 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 |
| Snowdrop Windflower | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Toxic to pets |
| Soapwort | Direct sun (at least 4-6 hours) | Water during establishment; drought-tolerant once rooted | Toxic to pets |
| Sobralia macrantha | Bright indirect light (just back from a sunny window) | Water generously in active growth, keeping evenly moist; ease off in winter | Pet-safe |
| Sobralia xantholeuca | Bright indirect light (just back from a sunny window) | Water freely in active growth to stay evenly moist; reduce in winter | Pet-safe |
| Soft Draba | Direct sun (at least 4-6 hours) | Very low — keep almost dry in winter | Mildly toxic to pets |
| Soidao Wax Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in growth; reduce to every 3–4 weeks in cooler months | Pet-safe |
| Soncoya | Direct sun (at least 4-6 hours) | Twice weekly when young; weekly once established | Mildly toxic to pets |
| Sooty Coelogyne | Bright indirect light (just back from a sunny window) | Every 5–7 days in growth; reduce to every 10–14 days in winter | Pet-safe |
| 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 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 |
| Southernwood-leaved Pelargonium | Direct sun (at least 4-6 hours) | Water every 10-14 days in the growing season; very sparingly in winter | Toxic to pets |
| Souvenir de la Malmaison Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while establishing; mature plants when the top 5 cm of soil is dry | Pet-safe |
| Spanish jasmine | Direct sun (at least 4-6 hours) | Weekly in the growing season; reduce in winter | Mildly toxic to pets |
| Spanish Juniper | Direct sun (at least 4-6 hours) | Water fortnightly when young; essentially self-sufficient once established | Mildly toxic to pets |
| Spanish Wood Thyme | Direct sun (at least 4-6 hours) | Every 2-3 weeks once established | 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 |
| Spearmint 'Kentucky Colonel' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 2-4 days | Toxic to pets |
| Spencer Mixed sweet pea | Direct sun (at least 4-6 hours) | Every 5–7 days; keep roots evenly moist | Mildly toxic to pets |
| Spencer Waved sweet pea | Direct sun (at least 4-6 hours) | Every 2–4 days in warm weather; every 5–7 days in cool spells | Toxic to pets |
| Spider Orchid | Bright indirect light (just back from a sunny window) | When the bark surface dries, roughly every 5-7 days in growth | Mildly toxic to pets |
| Spiked Ginger Lily | Bright indirect light (just back from a sunny window) | Regularly during active growth; sparingly in winter | Mildly toxic to pets |
| Spiked Ginger Lily | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 6-8 days in the growing season; reduce to every 2-3 weeks in winter | Mildly toxic to pets |
| Spiny Billbergia | Bright indirect light (just back from a sunny window) | Every 10–14 days | Pet-safe |
| Spiny Club Cactus | Direct sun (at least 4-6 hours) | When soil is dry, about every 10-14 days in summer; little to none in winter | Pet-safe |
| Spotted Gongora | Bright indirect light (just back from a sunny window) | Regularly year-round; allow medium to approach dryness between waterings | Pet-safe |
| Spottted Horsemint | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought, roughly every 10-14 days | Mildly toxic to pets |
| Spring Cyclamen | Medium indirect light (a couple of metres from a window) | When the top 2 cm of soil is dry, roughly every 7-10 days during active growth | Toxic to pets |
| Spring 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 |
| Square Leaf Hoya | Bright indirect light (just back from a sunny window) | When the top third of the mix dries out (roughly weekly in summer, every 2 weeks in winter) | Pet-safe |
| Squirrel Corn | Medium indirect light (a couple of metres from a window) | Every 3-5 days in spring growing season; no irrigation once dormant | Toxic to pets |
| Stamford's Epidendrum | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; every 14–21 days in winter rest | Pet-safe |
| Stanhopea oculata | Bright indirect light (just back from a sunny window) | When the basket surface begins to dry, often every 2-4 days in growth | Pet-safe |
| Stanhopea tigrina | Bright indirect light (just back from a sunny window) | Every 2-4 days in warm active growth; weekly in cooler, shorter days | Pet-safe |
| Stanhopea wardii | Bright indirect light (just back from a sunny window) | When the basket surface starts to dry, roughly every 2-4 days in active growth | Pet-safe |
| 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 |
| Stephan's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late August through November (active growth); withheld completely from May to late August | Pet-safe |
| Steppe Sage | Direct sun (at least 4-6 hours) | Low — every 10–14 days in summer, minimal in winter | Mildly toxic to pets |
| Sterling Silver Linden | Direct sun (at least 4-6 hours) | Weekly during the first 2 years; monthly deep watering once established | Pet-safe |
| Sticky Primrose | Bright indirect light (just back from a sunny window) | Regularly in spring and summer; minimal in winter | Toxic to pets |
| 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 |
| String Bean Hoya | Bright indirect light (just back from a sunny window) | When the soil is almost fully dry, roughly every 10-14 days | Pet-safe |
| String of Fishhooks | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| String of pickles | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks | Mildly toxic to pets |
| Strobel's Masdevallia | Medium indirect light (a couple of metres from a window) | Every 1–2 days; keep substrate evenly moist throughout the year | Pet-safe |
| Sugar and Spice Tiarella | Medium indirect light (a couple of metres from a window) | Keep consistently moist; deep-water once or twice weekly in dry spells | Mildly toxic to pets |
| Summer Hyacinth | Direct sun (at least 4-6 hours) | Regular during spring and summer; reduce in autumn and 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 |
| Superb pink | Direct sun (at least 4-6 hours) | Every 7–10 days; drought-tolerant once established | Mildly toxic to pets |
| Superba Pubescent Lilac | Direct sun (at least 4-6 hours) | When the top 5 cm of soil feels dry, roughly every 7-10 days in the growing season | Mildly toxic to pets |
| Susan Magnolia | Direct sun (at least 4-6 hours) | Weekly during establishment (2–3 years); every 10–14 days when mature in dry weather | Mildly toxic to pets |
| Swamp Azalea | Bright indirect light (just back from a sunny window) | Keep soil consistently moist; in garden settings water every 5-7 days during dry spells | Toxic to pets |
| Swamp doghobble | Medium indirect light (a couple of metres from a window) | Frequently; keep soil consistently moist | Toxic to pets |
| Swamp Milkweed | Direct sun (at least 4-6 hours) | Keep consistently moist; water during dry spells and never let it dry out for long | Toxic to pets |
| Swan Orchid | Bright indirect light (just back from a sunny window) | Water freely every 3-5 days during active growth; stop almost entirely (water monthly at most) once leaves drop and rest begins | Pet-safe |
| Sweet Annie | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry; about every 5-7 days while young, then sparingly | Toxic to pets |
| Sweet Autumn Clematis | Direct sun (at least 4-6 hours) | When the top 5 cm of soil is dry, roughly every 10-14 days once established | Toxic to pets |
| Sweet Autumn Clematis | Direct sun (at least 4-6 hours) | Deeply once a week during the growing season; drought-tolerant once established | Toxic to pets |
| Sweet Azalea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in the growing season | Toxic to pets |
| Sweet 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 Box | Low light (north window or shaded room) | Water regularly while establishing; once settled, every 7-14 days in dry spells | Mildly toxic to pets |
| 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 Clockvine | Direct sun (at least 4-6 hours) | Every 5–7 days; allow the top soil to partially dry between waterings | Mildly toxic to pets |
| Sweet Flag | Direct sun (at least 4-6 hours) | Keep permanently wet; ideal in standing water or saturated soil at all times | Toxic to pets |
| Sweet pea | Direct sun (at least 4-6 hours) | Weekly deep watering | Toxic to pets |
| Sweet Pea 'Cupani' | Direct sun (at least 4-6 hours) | Every 2-3 days in growth, more in heat; keep soil evenly moist | Mildly toxic to pets |
| Sweet Pea 'Spencer' | Direct sun (at least 4-6 hours) | Every 2-3 days, keeping soil consistently moist | Mildly toxic to pets |
| Sweet Pitcher Plant | Direct sun (at least 4-6 hours) | Tray method: keep 1-3 cm of distilled or rainwater in the saucer continuously during the growing season; reduce to slightly moist in winter | Pet-safe |
| Sweet sultan | Direct sun (at least 4-6 hours) | Every 7–10 days | Pet-safe |
| Sweet Trichopilia | Medium indirect light (a couple of metres from a window) | Water when the top 2-3 cm of medium is dry, roughly every 5-8 days in summer; reduce to every 10-14 days in winter | Pet-safe |
| Sweet Trillium | Low light (north window or shaded room) | Keep soil consistently moist spring through early summer; minimal once dormant | Mildly toxic to pets |
| Sweet violet | Medium indirect light (a couple of metres from a window) | Every 5–7 days; keep evenly moist | Pet-safe |
| Sweet White Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist during spring; reduce after dormancy onset | Mildly toxic to pets |
| Sweet White Violet | Medium indirect light (a couple of metres from a window) | Regular; keep soil consistently moist | Pet-safe |
| Sweet William | Direct sun (at least 4-6 hours) | Every 5–7 days; allow surface to dry slightly between waterings | Mildly toxic to pets |
| Sweet Woodruff | Medium indirect light (a couple of metres from a window) | Regular in summer; reduce in autumn and winter | Mildly toxic to pets |
| Sweetbells Leucothoe | Medium indirect light (a couple of metres from a window) | Regularly throughout the growing season; do not allow to dry out | Toxic to pets |
| Sweetbriar Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then minimal | Pet-safe |
| Sword-Leaved Air Plant | Bright indirect light (just back from a sunny window) | Mist 2-3 times per week or soak 20 minutes weekly | Pet-safe |
| 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 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 |
| Tahitian Gardenia | Direct sun (at least 4-6 hours) | Every 5–7 days when in active growth; every 10–14 days in cooler months | Mildly toxic to pets |
| Tailed Masdevallia | Bright indirect light (just back from a sunny window) | Daily in warm weather; every 3–5 days in cooler months | Pet-safe |
| Taiwan Shell Ginger | Bright indirect light (just back from a sunny window) | Regularly; keep soil evenly moist during the growing season | Mildly toxic to pets |
| Tall Mix pincushion flower | Direct sun (at least 4-6 hours) | Once or twice weekly | Pet-safe |
| Tamanu | Direct sun (at least 4-6 hours) | Weekly when established; more frequent for young trees | Mildly toxic to pets |
| Tartarian Honeysuckle | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days once established | Toxic to pets |
| tea plant | Bright indirect light (just back from a sunny window) | Regularly; keep evenly moist throughout the growing season | Mildly toxic to pets |
| Teasing Georgia Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season; more in heat | Pet-safe |
| Telstar Mix China Pink | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days | Toxic to pets |
| Tessellated Vanda | Direct sun (at least 4-6 hours) | Daily in heat; every 2-3 days in cool, low-light spells | Pet-safe |
| Texas Rainbow Cactus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once a month or less in winter | Pet-safe |
| 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 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 |
| Thelocactus setispinus | Direct sun (at least 4-6 hours) | When the top of the mix dries, roughly every 7-12 days in growth; keep dry in winter | Pet-safe |
| Therese Bugnet Rose | Direct sun (at least 4-6 hours) | Weekly while establishing; drought-tolerant thereafter | Pet-safe |
| Thick Gongora | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; every 10–14 days in winter rest | Pet-safe |
| Thomsonii Wax Plant | Bright indirect light (just back from a sunny window) | When the top 2-3 cm (about the top 60-80%) of the mix is dry, roughly weekly in spring/summer and less in winter | Pet-safe |
| Three-Coloured Vanda | Direct sun (at least 4-6 hours) | Daily in warm growth; every 2-3 days when cool and dim | Pet-safe |
| Thyme | Direct sun (at least 4-6 hours) | When the top of the soil is dry, every 10-14 days | Pet-safe |
| Thyrse Ginger Lily | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil feels dry, roughly every 5-8 days in summer; every 12-14 days in winter | Mildly toxic to pets |
| Tiger Crow Orchid | Bright indirect light (just back from a sunny window) | When the bark mix is nearly dry, roughly every 5-7 days in growth | Pet-safe |
| Tilia cordata | Direct sun (at least 4-6 hours) | Water young trees deeply every 7-14 days in dry spells for the first two seasons; established trees are largely self-sufficient | Pet-safe |
| Tillandsia bergeri | Bright indirect light (just back from a sunny window) | Soak 20-30 minutes weekly; mist between soaks in dry air | Pet-safe |
| Toad Tree | Direct sun (at least 4-6 hours) | Moderate; water regularly in summer, reduce significantly in winter dormancy | Toxic to pets |
| 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 |
| Tree Kopsia | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth, every 10-14 days in winter | Toxic to pets |
| Treneague Chamomile | Direct sun (at least 4-6 hours) | Weekly until established, then only in extended dry spells | Toxic to pets |
| Trewithen Blue Ceanothus | Direct sun (at least 4-6 hours) | Every 7-10 days during establishment; established plants are drought-tolerant and need supplemental watering only in prolonged dry periods in summer | Mildly toxic to pets |
| True lily | Bright indirect light (just back from a sunny window) | Keep evenly moist while growing, every 5-7 days | Toxic to pets |
| Trumpeter Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly | Pet-safe |
| Truncated Gongora | Bright indirect light (just back from a sunny window) | Abundantly during growth; reduced but never dry in winter | Pet-safe |
| Tulbaghia | Direct sun (at least 4-6 hours) | Water moderately in growth, letting the top few centimetres dry; roughly every 7-10 days in summer | Mildly toxic to pets |
| Tulipa 'Angelique' | Direct sun (at least 4-6 hours) | Moist during autumn rooting and spring growth; dry off as foliage yellows | Toxic to pets |
| Tulipa 'Monsella' | Direct sun (at least 4-6 hours) | Moist in active spring growth; dry through summer dormancy | Toxic to pets |
| Tulipa 'Prinses Irene' | Direct sun (at least 4-6 hours) | Keep soil moist while growing in spring; let bulbs stay dry in summer dormancy | Toxic to pets |
| Tulipa sylvestris | Direct sun (at least 4-6 hours) | Rainfall in most settings; tolerates moister ground than hybrids | Toxic to pets |
| Tulsi Vana | Direct sun (at least 4-6 hours) | Water when the top 2-3 cm of soil is dry, roughly every 3-5 days; allow slight drying between waterings | Pet-safe |
| Turkish Catmint | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; very sparingly in winter | Pet-safe |
| Tuscan Blue Rosemary | Direct sun (at least 4-6 hours) | Every 7–14 days; allow soil to dry thoroughly between waterings | Pet-safe |
| Twinkle Oncidium | Bright indirect light (just back from a sunny window) | When the top of the mix begins to dry, about every 4-6 days | Pet-safe |
| Twisted-Fruit Air Plant | Bright indirect light (just back from a sunny window) | Mist daily in spring through autumn; reduce in winter | Pet-safe |
| Two-colored Lacaena | Medium indirect light (a couple of metres from a window) | Water when the medium is nearly dry at the surface, roughly every 5-8 days in active growth; reduce to every 10-14 days in cooler months | Pet-safe |
| Unscented Dendrobium | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; nearly dry in the winter rest (October–February) | Pet-safe |
| Valerian | Direct sun (at least 4-6 hours) | Keep moist; water when the top 3 cm of soil dries, roughly every 4-7 days in dry weather | Mildly toxic to pets |
| Vanilla Trumpet Vine | Direct sun (at least 4-6 hours) | Twice weekly during summer; weekly or less in winter | Mildly toxic to pets |
| Variegated Solomon's Seal | Low light (north window or shaded room) | Every 5-7 days in active growth; drought-tolerant once established | Toxic to pets |
| Vasey's Trillium | Medium indirect light (a couple of metres from a window) | Consistently moist through spring; reduce over summer dormancy | Mildly toxic to pets |
| Veined Begonia (Venosa) | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry; sparingly in winter (roughly monthly) | Toxic to pets |
| Vera lavender | Direct sun (at least 4-6 hours) | Every 1–2 weeks in the first season; monthly once established in most climates | Mildly toxic to pets |
| Verticillata Wax Plant | Bright indirect light (just back from a sunny window) | Every 1-2 weeks; when the top 3cm of mix is dry | Pet-safe |
| Veterans' Honor Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly during growth | Pet-safe |
| Victoria cruziana | Direct sun (at least 4-6 hours) | Permanently submerged in warm, still water 0.5-1 m+ deep | Mildly toxic to pets |
| Viguier's Angraecum | Bright indirect light (just back from a sunny window) | Freely throughout growing season; reduce in winter | 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 |
| Virginia Stock | Bright indirect light (just back from a sunny window) | Weekly (keep soil evenly moist but not waterlogged) | Mildly toxic to pets |
| Vranja quince | Direct sun (at least 4-6 hours) | Weekly during dry spells; tolerates brief periods of drought once established | Pet-safe |
| Warscewicz's Cattleya | Bright indirect light (just back from a sunny window) | Every 7-10 days during active growth; reduce to every 3-4 weeks during the post-flowering rest | Pet-safe |
| Warty Brassavola | Bright indirect light (just back from a sunny window) | Every 4–6 days in active growth; every 7–10 days in cooler, slower months | Pet-safe |
| Watch Chain Plant | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; roughly monthly or less in winter | Mildly toxic to pets |
| Water lemon | Direct sun (at least 4-6 hours) | Every 5–7 days; daily during dry season | Mildly toxic to pets |
| Water Mint | Bright indirect light (just back from a sunny window) | Constantly moist to waterlogged; suited to pond margins up to 25 cm depth | Toxic to pets |
| Wax plant | Bright indirect light (just back from a sunny window) | When the soil is dry, every 10-14 days | Pet-safe |
| Weasel Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; monthly or less in winter | Mildly toxic to pets |
| Wendland's Bulbophyllum | Medium indirect light (a couple of metres from a window) | Regularly throughout the year; keep medium consistently moist in summer, slightly drier in winter | Pet-safe |
| Wenzel's Chain Orchid | Bright indirect light (just back from a sunny window) | When the top 1-2 cm of the potting medium feels dry, roughly every 5-7 days | Pet-safe |
| Western Wild Ginger | Low light (north window or shaded room) | Every 5–7 days during the growing season; every 10–14 days once established | Mildly toxic to pets |
| Whip Brassavola | Bright indirect light (just back from a sunny window) | Every 3–5 days in summer; every 7–10 days in winter | Pet-safe |
| White Bergamot | Medium indirect light (a couple of metres from a window) | Twice weekly in summer; weekly in cooler months | Pet-safe |
| White Campion | Bright indirect light (just back from a sunny window) | Low to moderate; allow soil to approach dryness between waterings | Mildly toxic to pets |
| White Frangipani | Direct sun (at least 4-6 hours) | Every 7–14 days in the growing season; once per month or less in winter | Toxic to pets |
| White Freesia | Direct sun (at least 4-6 hours) | Moderate during active growth (autumn to spring); completely dry during summer dormancy | Pet-safe |
| White Gardenia | Bright indirect light (just back from a sunny window) | Every 7–10 days during growing season; every 14–21 days in winter | Mildly toxic to pets |
| White Ginger Lily | Bright indirect light (just back from a sunny window) | Water generously every 2–4 days in active growth; reduce to sparingly in winter dormancy | Mildly toxic to pets |
| White Ginger Lily | Bright indirect light (just back from a sunny window) | Keep soil consistently moist, watering roughly every 3-5 days during active growth | Pet-safe |
| White Ixora | Direct sun (at least 4-6 hours) | 2-3 times per week in summer, weekly in winter | Mildly toxic to pets |
| White Laelia | Bright indirect light (just back from a sunny window) | Every 5–7 days in spring and autumn; once every 2–3 weeks in summer dry rest | Pet-safe |
| White Lotus Lily | Direct sun (at least 4-6 hours) | Fully aquatic; roots submerged, leaves floating or emergent | Mildly toxic to pets |
| White Mugwort | Medium indirect light (a couple of metres from a window) | Weekly or when top 2–3 cm of soil dries | Mildly toxic to pets |
| White Passionflower | Direct sun (at least 4-6 hours) | Once a week during dry spells; less in winter | Pet-safe |
| White Sage | Direct sun (at least 4-6 hours) | Sparingly — when soil is bone dry, roughly every 10-14 days in heat and far less otherwise | Pet-safe |
| White Tabernaemontana | Bright indirect light (just back from a sunny window) | Twice weekly during active growth; once per week or less in winter | Toxic to pets |
| white trumpet sinningia | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; reduce to rare misting or none during dormancy | Pet-safe |
| White-Bark Magnolia | Bright indirect light (just back from a sunny window) | Weekly during dry spells for the first 3 years; every 2 weeks when established | Pet-safe |
| White-blue Sage | Direct sun (at least 4-6 hours) | Low to moderate — seasonal wet–dry cycle; allow soil to dry between waterings | Mildly toxic to pets |
| White-Flowered Lycaste | Bright indirect light (just back from a sunny window) | Every 5–7 days in active growth; every 14–21 days during winter rest | Pet-safe |
| White-pink Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; every 4-6 weeks or less in winter | Mildly toxic to pets |
| Wild Bergamot | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry; weekly in dry spells, less once established | Mildly toxic to pets |
| Wild Blue Phlox | Medium indirect light (a couple of metres from a window) | Weekly; keep soil evenly moist | Mildly toxic to pets |
| Wild Edric Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly in the growing season, more in heat or sandy soil | Pet-safe |
| Wild Garlic Vine | Direct sun (at least 4-6 hours) | Every 5–7 days during the growing season; reduce in cooler months | Mildly toxic to pets |
| Wild jasmine | Bright indirect light (just back from a sunny window) | Once or twice a week during active growth; reduce in winter | Pet-safe |
| Wild Rose | Direct sun (at least 4-6 hours) | Weekly while establishing, then rarely once mature | Pet-safe |
| Wild Turmeric | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry during the growing season, roughly every 5-7 days | Mildly toxic to pets |
| Wildeve Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly while growing, increasing in heat and on free-draining soils | Pet-safe |
| William Shakespeare 2000 Rose | Direct sun (at least 4-6 hours) | Deeply once or twice weekly through the growing season, more in heat | Pet-safe |
| Winged Encyclia | Bright indirect light (just back from a sunny window) | When the pot is dry, roughly every 7-10 days in summer | Pet-safe |
| Winter Iris | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water sparingly in summer | Toxic to pets |
| Wintergreen Barberry | Bright indirect light (just back from a sunny window) | When the top 5-8 cm of soil is dry, roughly every 10-14 days | Mildly toxic to pets |
| Wintersweet | Direct sun (at least 4-6 hours) | Water in dry spells; moderate once established | Mildly toxic to pets |
| 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 |
| Wisteria 'Amethyst Falls' | Direct sun (at least 4-6 hours) | Weekly while establishing; water in summer drought | Toxic to pets |
| Wisteria sinensis | Direct sun (at least 4-6 hours) | Water deeply during dry spells, especially while flower buds form; established plants are fairly drought-tolerant | Toxic to pets |
| Wisteria sinensis 'Alba' | Direct sun (at least 4-6 hours) | Water deeply during dry spells, especially as buds form; established plants tolerate some drought | Toxic to pets |
| Witch Hazel | Bright indirect light (just back from a sunny window) | Keep evenly moist; water in dry spells | Mildly toxic to pets |
| Witteberg Cone Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn–winter; almost none in summer | Pet-safe |
| Wood Sage | Medium indirect light (a couple of metres from a window) | Low to moderate; drought-tolerant once established | Mildly toxic to pets |
| Woolly Lavender | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Toxic to pets |
| Wulfen's Alyssum | Direct sun (at least 4-6 hours) | Every 14–21 days during growing season; very little in winter | Pet-safe |
| Yarrow 'Moonshine' | Direct sun (at least 4-6 hours) | When the top few centimeters of soil are dry, roughly every 7-14 days | Mildly toxic to pets |
| Yellow Azalea | Bright indirect light (just back from a sunny window) | Weekly during dry spells; established plants are reasonably drought-tolerant but flower best with consistent moisture | Toxic to pets |
| Yellow 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 False Jasmine | Bright indirect light (just back from a sunny window) | Water every 7-10 days during the growing season; reduce to every 2-3 weeks once established and dormancy slows growth | Toxic to pets |
| Yellow Germander | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; little to none in winter | Mildly toxic to pets |
| Yellow Ginger Lily | Bright indirect light (just back from a sunny window) | Generously during the growing season; greatly reduced in winter dormancy | Mildly toxic to pets |
| Yellow Ginger Lily | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer; reduce to every 10-14 days in winter | Mildly toxic to pets |
| Yellow Promenaea | Medium indirect light (a couple of metres from a window) | Water when the potting medium is nearly dry at the surface but still faintly moist below, roughly every 5-8 days in summer and every 10-14 days in cooler months | Pet-safe |
| Yellow Trillium | Medium indirect light (a couple of metres from a window) | Regular during spring growing season; reduced once foliage dies back in summer. | Mildly toxic to pets |
| Yellow Trumpet Vine | Direct sun (at least 4-6 hours) | Every 5–7 days during active growth; reduce in cooler months | Mildly toxic to pets |
| Yellow Water Lily | Direct sun (at least 4-6 hours) | Permanently aquatic — crown submerged 15–45 cm (6–18 in) below water surface | Pet-safe |
| Yesterday-Today-and-Tomorrow | Bright indirect light (just back from a sunny window) | Keep evenly moist; water when the top of the soil starts to dry, roughly 1-2x per week in growth. | Toxic to pets |
| Yulan Magnolia | Direct sun (at least 4-6 hours) | Weekly when young; established trees need water during prolonged dry spells | Pet-safe |
| Zecher's Air Plant | Medium indirect light (a couple of metres from a window) | Soak 30 minutes twice weekly; mist 2-3 times per week between soaks | Pet-safe |
| Zedoary | Bright indirect light (just back from a sunny window) | Keep consistently moist in the growing season; withhold water during winter dormancy | Mildly toxic to pets |
| Zehtner's Discocactus | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is completely dry, roughly every 10-14 days in summer; reduce to once every 4-6 weeks in winter | Pet-safe |
| 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 |
| 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 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 |
| Zygopetalum Orchid | Bright indirect light (just back from a sunny window) | Roughly every 3-7 days; more often in warm, active growth, less in winter | Mildly toxic to pets |