| Adromischus Cooperi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Cristatus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Adromischus Hemisphaericus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Adromischus Maculatus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Marianiae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Adromischus Trigynus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Mildly toxic to pets |
| Aeonium Haworthii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| Aeonium Sunburst | Bright indirect light (just back from a sunny window) | When the top few centimetres of soil are dry, about weekly in active growth, sparingly in summer dormancy | Mildly toxic to pets |
| Aeonium Velour | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is fully dry, roughly every 10-14 days in active growth | Mildly toxic to pets |
| African Milk Tree | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; roughly every 3-4 weeks in winter | Toxic to pets |
| African Spear Plant | Medium indirect light (a couple of metres from a window) | When the soil is completely dry, roughly every 2-4 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Agave americana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave americana 'Marginata' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave americana 'Mediopicta Alba' | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave attenuata | Bright indirect light (just back from a sunny window) | When the top few centimetres of soil are dry, roughly every 1-2 weeks in summer | Mildly toxic to pets |
| Agave Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; very sparingly in winter | Pet-safe |
| Agave parryi | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave parryi var. truncata | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Agave victoriae-reginae | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer | Mildly toxic to pets |
| Aizoon Rosularia | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in spring and summer; rarely in winter | Pet-safe |
| Aloe 'Delta Lights' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe 'Pink Blush' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Aloe vera | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| Aloe-like Nananthus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer; once every 4-6 weeks in winter | Mildly toxic to pets |
| Aloinopsis luckhoffii | Direct sun (at least 4-6 hours) | During cool-season growth (autumn-spring); keep nearly dry in summer | Mildly toxic to pets |
| Aloinopsis malherbei | Direct sun (at least 4-6 hours) | Mainly autumn through spring; keep nearly dry in summer dormancy | Mildly toxic to pets |
| Aloinopsis rosulata | Direct sun (at least 4-6 hours) | Autumn through spring growth; keep nearly dry in summer | Mildly toxic to pets |
| Aloinopsis schooneesii | Direct sun (at least 4-6 hours) | Autumn through spring; reduce sharply in summer and keep dry in deep winter cold | Mildly toxic to pets |
| Aloinopsis setifera | Direct sun (at least 4-6 hours) | Autumn through spring growth; keep nearly dry in summer | Mildly toxic to pets |
| Alonso's Turbinicarpus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 14-21 days in the growing season; withhold almost entirely in winter | Pet-safe |
| 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 |
| Anaga Monanthes | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in winter | Mildly toxic to pets |
| Annual Seablite | Direct sun (at least 4-6 hours) | Keep consistently moist; tolerates periodic waterlogging | Mildly toxic to pets |
| Antimima dualis | Direct sun (at least 4-6 hours) | Thorough but infrequent autumn-spring; little or none in summer | Mildly toxic to pets |
| Arabian Desert Rose | Direct sun (at least 4-6 hours) | Every 7–14 days in active growth (spring–summer); minimal in winter dormancy | Toxic to pets |
| 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 |
| Argyroderma testiculare | Direct sun (at least 4-6 hours) | Only during active growth (autumn through spring); keep bone-dry in summer dormancy | Mildly toxic to pets |
| Arid Mountain Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (autumn–spring); none in summer | Toxic to pets |
| Ariocarpus Fissuratus | Bright indirect light (just back from a sunny window) | Very sparingly — when fully dry, roughly every 3-4 weeks in summer; almost none otherwise | Mildly toxic to pets |
| Arizona Chalk Dudleya | Direct sun (at least 4-6 hours) | Every 3–4 weeks in winter and early spring; completely dry in summer dormancy | Mildly toxic to pets |
| Armored Frailea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Artillery Plant | Bright indirect light (just back from a sunny window) | When the top 1-2 cm (about half an inch) of soil is dry | Pet-safe |
| Ashton's Ice Plant | Direct sun (at least 4-6 hours) | When the top 2–3 cm of soil is dry, roughly every 7–14 days during the growing season; minimal in winter | Mildly toxic to pets |
| Astroloba Bullulata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth; monthly or less in winter | Mildly toxic to pets |
| Astroloba Congesta | Bright indirect light (just back from a sunny window) | When soil is completely dry, about every 2-3 weeks in growth and monthly or less in winter | Mildly toxic to pets |
| Astroloba Foliolosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry — roughly every 2-3 weeks in growth, monthly or less in winter | Mildly toxic to pets |
| Atlantic Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; once monthly in winter | Mildly toxic to pets |
| Aztec Cactus | Bright indirect light (just back from a sunny window) | When the potting mix is almost completely dry, roughly every 14-28 days in the growing season; very sparingly in winter | Pet-safe |
| Baby Toes | Direct sun (at least 4-6 hours) | Every 3–4 weeks in summer active season; very rarely in winter | Pet-safe |
| Bacopa caroliniana | Bright indirect light (just back from a sunny window) | Grown submersed; do a 30-50% aquarium water change weekly | Mildly toxic to pets |
| Ball Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, about every 7-10 days in summer; sparingly to none in winter | Pet-safe |
| Baron's Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; none from late autumn to mid-spring | Toxic to pets |
| Baseball Plant | Bright indirect light (just back from a sunny window) | Every 3-4 weeks in spring/summer; roughly every 6-8 weeks (or less) in winter | Toxic to pets |
| Bastard Cobas | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; once every 4–6 weeks or less in winter | Toxic to pets |
| Beach Cabbage | Direct sun (at least 4-6 hours) | Every 7–14 days; drought-tolerant once established | Mildly toxic to pets |
| Bear Paw | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; roughly every 2-3 weeks in winter | Toxic to pets |
| Bearded Huernia | Bright indirect light (just back from a sunny window) | Every 14–21 days when actively growing (spring–autumn); minimal in winter (once a month or less) | Pet-safe |
| Bearded Trichodiadema | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in the growing season (winter-spring); reduce in summer when the plant is semi-dormant | Pet-safe |
| Beaucarnea Gracilis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer and monthly or less in winter | Pet-safe |
| Beaucarnea Stricta | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and much less in winter | Pet-safe |
| Beautiful Graptopetalum | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; monthly or less in winter | Pet-safe |
| Beautiful Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water only during active growth (late summer through autumn and again briefly in spring); keep dry the rest of the year | Pet-safe |
| Beavertail Cactus | Direct sun (at least 4-6 hours) | Very sparingly when soil is bone dry, roughly every 3-4 weeks in summer; keep dry in winter | Pet-safe |
| Bedding Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 3-5 days | Toxic to pets |
| Begonia 'Nonstop Joy White' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia 'Picotee Lace Pink' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia 'Pin Up Flame' | Medium indirect light (a couple of metres from a window) | Keep evenly moist; water when the surface begins to dry, often every 2-4 days in summer pots | Toxic to pets |
| Begonia × tuberhybrida 'Non-Stop Mocca White' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 3-5 days in growth | Toxic to pets |
| Begonia × tuberhybrida 'Nonstop Rose' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is just dry, roughly every 2-4 days in summer | Toxic to pets |
| Begonia × tuberhybrida 'Pin-Up Flame' | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is just dry, roughly every 2-4 days in summer | Toxic to pets |
| Bell Cotyledon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 5–6 weeks in winter | Toxic to pets |
| Bergeranthus multiceps | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly every 7-10 days in active growth; reduce in peak summer and winter | Mildly toxic to pets |
| Bethencourt's Aichryson | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season (spring and autumn); sparingly in summer heat and winter rest | Mildly toxic to pets |
| Bird's Nest Cactus | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 7-14 days in summer | Pet-safe |
| Bishop's Cap Cactus | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; roughly monthly or less in winter | Pet-safe |
| Black Rose Aeonium | Direct sun (at least 4-6 hours) | Every 1–2 weeks autumn to spring; minimal in summer dormancy | Mildly toxic to pets |
| Blochman's Liveforever | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (October–April); virtually none in summer | Pet-safe |
| Blue Chalk Sticks | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; every 4–6 weeks in winter | Toxic to pets |
| Blue Chalk Sticks | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 12-18 days in growth | Toxic to pets |
| Blue Chalksticks | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; every 4–6 weeks in winter | Toxic to pets |
| Blue Chalksticks | Direct sun (at least 4-6 hours) | Roughly every 2-3 weeks in spring and summer; about once a month or less in winter. | Toxic to pets |
| Blue Columnar Cactus | Direct sun (at least 4-6 hours) | When the top half of soil is dry, roughly every 10-14 days in summer; every 4-6 weeks in winter | Pet-safe |
| Blue Melon Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 3-4 weeks in winter | Pet-safe |
| Blue Spruce Sedum | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer, less in winter | Pet-safe |
| Blue Spruce Stonecrop | Direct sun (at least 4-6 hours) | Every 14-21 days in spring and summer; monthly or less in winter | Pet-safe |
| Blue Torch Cactus | Direct sun (at least 4-6 hours) | When the mix is fully dry, about every 2-3 weeks in summer; nearly none in winter | Mildly toxic to pets |
| Blushing Dunce Cap | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; very sparingly in autumn; almost none in winter | Pet-safe |
| Boehmer's Dunce Cap | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer (active growing season); once monthly or less in winter | Mildly toxic to pets |
| Boivin's Peperomia | Bright indirect light (just back from a sunny window) | Every 14–21 days in the growing season; every 4–6 weeks in winter | Pet-safe |
| Boke's Button Cactus | Direct sun (at least 4-6 hours) | When the mix has been dry for several days; roughly every 14-28 days in the growing season and once every 6-8 weeks in winter | Pet-safe |
| Bolus' Stomatium | Bright indirect light (just back from a sunny window) | Very sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Bonsai Pachypodium | Direct sun (at least 4-6 hours) | Every 14–21 days in summer; none or barely any in winter dormancy | Toxic to pets |
| Borchers' Oroya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, every 10-14 days in summer | Pet-safe |
| Borchers' Schwantesia | Direct sun (at least 4-6 hours) | Every 10-14 days in the autumn-winter growing season; taper to monthly in spring; almost none in summer | Mildly toxic to pets |
| Bracteate Rhinephyllum | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring–summer; minimal in winter | Pet-safe |
| Brain Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in spring and summer; nearly dry through winter | Pet-safe |
| Brassavola digbyana | Bright indirect light (just back from a sunny window) | Every 5-7 days in growth; far less in winter rest, every 2-3 weeks | Pet-safe |
| Britten's Tiger Jaws | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season (late summer–autumn); minimal in winter and spring | Pet-safe |
| Britten's Tiger Jaws | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn to spring); once a month or less in summer | Pet-safe |
| Broadway's Melon Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 4 weeks in winter | Pet-safe |
| Bruch's Chin Cactus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in summer; very sparingly in winter | Pet-safe |
| Brunthal's Ice Plant | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in the growing season; every 3-4 weeks in winter | Mildly toxic to pets |
| Buchholz's Tylecodon | Bright indirect light (just back from a sunny window) | Every 10–14 days when actively growing (autumn–spring); once per month or less in summer | Toxic to pets |
| Buddha's Temple | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth; minimal in winter | Toxic to pets |
| Bueck's Thelocactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer; once a month or less in winter | Pet-safe |
| Buffalo Cow Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, approximately every 14-21 days in summer | Pet-safe |
| Buining's Uebelmannia | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; once every 4-6 weeks or less in winter | Pet-safe |
| Bulbous Trichodiadema | Direct sun (at least 4-6 hours) | Every 2–3 weeks during spring and summer; once a month or less in winter | Pet-safe |
| Bunny Ear Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 10-14 days in summer; every 4-6 weeks in autumn; once a month or less in winter | Mildly toxic to pets |
| Burchard's Caralluma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and autumn; very sparingly in summer and winter | Mildly toxic to pets |
| Burchell's Mistletoe Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season; every 14-21 days in winter | Pet-safe |
| Burro's tail | Bright indirect light (just back from a sunny window) | When soil is dry, every 14-21 days | Pet-safe |
| Bushy Aichryson | Bright indirect light (just back from a sunny window) | Every 10–15 days in summer (growing season); once monthly in winter | Mildly toxic to pets |
| Button Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep nearly dry in winter | Pet-safe |
| Button Cactus | Direct sun (at least 4-6 hours) | When the mix is completely dry, roughly every 14-21 days in summer; once a month or less in winter | Pet-safe |
| Campfire Crassula (Red Pagoda) | Direct sun (at least 4-6 hours) | Every 1-2 weeks in spring-summer; roughly monthly in winter | Mildly toxic to pets |
| Canary Island Monanthes | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in spring and summer; once monthly or less in autumn and winter | Mildly toxic to pets |
| Candelabra Euphorbia | Direct sun (at least 4-6 hours) | When the mix is completely dry, about every 2-3 weeks in summer | Toxic to pets |
| Candelabra Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn–spring (active), near-zero in summer (dormant) | Toxic to pets |
| Candelabrum Liveforever | Direct sun (at least 4-6 hours) | Every 1–2 weeks in autumn and winter; minimal in spring; none in summer | Pet-safe |
| Candia Sulcorebutia | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; virtually none from October to March | Pet-safe |
| Candle plant | Bright indirect light (just back from a sunny window) | When the soil is fully dry; roughly every 2-3 weeks in growth, far less in summer dormancy | Toxic to pets |
| Candle Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during autumn and spring active growth; once a month or less in summer dormancy | Toxic to pets |
| Canigueral's Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once a month during winter dormancy | Pet-safe |
| Cape Clubfoot | Direct sun (at least 4-6 hours) | Every 14–21 days in summer; once monthly or less in winter | Toxic to pets |
| Cape Fockea | Bright indirect light (just back from a sunny window) | Every 10–14 days during spring and summer growing season; once a month or less in winter | Mildly toxic to pets |
| Caralluma acutangula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Caralluma europaea | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; keep nearly dry October-March | Mildly toxic to pets |
| Caralluma hesperidum | Direct sun (at least 4-6 hours) | When soil is bone-dry, about every 10-14 days in active growth; keep nearly dry in winter | Mildly toxic to pets |
| Caralluma speciosa | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 7-12 days in summer heat; minimal water in winter | Mildly toxic to pets |
| Carmen's Pincushion | Direct sun (at least 4-6 hours) | Every 10-14 days in the spring-summer growing season when the top 2-3 cm of soil is dry; every 4-6 weeks or less in winter | Pet-safe |
| Carol's Ruschia | Direct sun (at least 4-6 hours) | When soil is completely dry, approximately every 10-14 days in spring-summer; once monthly or less in winter | Pet-safe |
| Carrion Flower (Stapelia gigantea) | Direct sun (at least 4-6 hours) | Every 2-3 weeks in active growth (spring-autumn); keep nearly dry in winter | Pet-safe |
| Cassytha Rhipsalis | 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 |
| Cat's Jaws | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth and much less in summer rest | Mildly toxic to pets |
| Cat's Jaws | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10–14 days in spring and summer; reduce to once a month or less in winter | Mildly toxic to pets |
| Cathedral Bells | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, approximately every 10-14 days in summer | Toxic to pets |
| Cavendish's Trichocentrum | Bright indirect light (just back from a sunny window) | Every 7-10 days in growth; every 14-21 days during the winter rest | Pet-safe |
| Cephalophyllum tricolorum | Direct sun (at least 4-6 hours) | Only when the soil is fully dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Ceropegia Ampliata | 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 | Mildly toxic to pets |
| Chain Rhipsalis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in summer; reduce to every 14-21 days in winter | Pet-safe |
| Chandelier Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer | Toxic to pets |
| Cheiridopsis candidissima | Direct sun (at least 4-6 hours) | Autumn through spring; keep dry during summer dormancy | Mildly toxic to pets |
| Cheiridopsis denticulata | Direct sun (at least 4-6 hours) | Autumn through spring; keep dry through summer dormancy | Mildly toxic to pets |
| Cheiridopsis pillansii | Direct sun (at least 4-6 hours) | Only during autumn-to-spring growth when soil is fully dry; near-zero in summer dormancy | Mildly toxic to pets |
| Cheiridopsis robusta | Direct sun (at least 4-6 hours) | During autumn-spring growth when soil is bone dry; withhold through summer | Mildly toxic to pets |
| Cheiridopsis turbinata | Direct sun (at least 4-6 hours) | In autumn-spring growth once soil is fully dry; minimal in summer dormancy | Mildly toxic to pets |
| Chin Cactus | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn; withhold in winter | Pet-safe |
| Chinese Dunce Cap | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (spring–summer); sparingly in winter | Pet-safe |
| Chinese Jade | Bright indirect light (just back from a sunny window) | Every 2–4 weeks (allow soil to dry completely between waterings) | Mildly toxic to pets |
| Chinese Tylecodon | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); minimal or none in summer | Toxic to pets |
| Christmas cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 7-10 days | Pet-safe |
| Christmas Tree Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 14-21 days in the growing season and once a month or less in winter | Pet-safe |
| Cigarette Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through early spring; none or near-none in summer | Pet-safe |
| Cinnamon Bunny Ears | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 2-3 weeks in summer; nearly dry in winter | Pet-safe |
| Cleft Antegibbaeum | Direct sun (at least 4-6 hours) | When the leaves begin to wrinkle slightly, roughly every 14-21 days in the growing season (autumn-spring); almost none in summer dormancy | Mildly toxic to pets |
| Cleistocactus baumannii | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly weekly in summer; sparingly in winter | Pet-safe |
| Cleistocactus Hyalacanthus | Direct sun (at least 4-6 hours) | When the mix is fully dry, about every 7-10 days in summer; keep dry in winter | Pet-safe |
| Cliff Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer, every 3–4 weeks in winter | Toxic to pets |
| Cliff Cotyledon | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, approximately every 14 days in summer | Toxic to pets |
| Cloud Liveforever | Direct sun (at least 4-6 hours) | Every 1–2 weeks in cool season (October–April); completely withheld June–September | Pet-safe |
| Coarctata Haworthia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Cocoon Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during active growth (spring and autumn); once a month in summer and winter | Toxic to pets |
| Codonanthe crassifolia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Mildly toxic to pets |
| Colima Butterwort | Bright indirect light (just back from a sunny window) | Water every 5–7 days; allow the surface to slightly dry between waterings | Pet-safe |
| Colocasia Antiquorum | Direct sun (at least 4-6 hours) | Keep soil constantly wet; water daily in heat, never let the root zone dry | Toxic to pets |
| Comb-Spined Uebelmannia | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; reduce to once every 5-6 weeks in winter | Pet-safe |
| Common Candelabra Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks in winter growing season; withhold almost entirely in summer dormancy | Toxic to pets |
| Common Foxtail Cactus | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 10-21 days in summer; very sparingly in winter | Pet-safe |
| Common Ice Plant | Direct sun (at least 4-6 hours) | Weekly to fortnightly (let soil surface dry between waterings) | Mildly toxic to pets |
| Common Iceplant | Direct sun (at least 4-6 hours) | Regularly when young; sparingly once established | Pet-safe |
| Compact Ice Plant | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in the growing season; monthly or less in winter | Mildly toxic to pets |
| Compton's Gibbaeum | Direct sun (at least 4-6 hours) | Every 2–4 weeks in autumn and spring (active growth); withheld or near-dry in summer and reduced in winter | Pet-safe |
| Compton's Living Stone | Direct sun (at least 4-6 hours) | Sparingly every 2-4 weeks in summer; none from late autumn through winter leaf renewal | Pet-safe |
| Concrete Leaf | Direct sun (at least 4-6 hours) | Sparingly; every 1-2 weeks in active growth (autumn/spring), nearly dry in summer and winter | Mildly toxic to pets |
| Confused Huernia | Bright indirect light (just back from a sunny window) | Every 14–21 days during active growth (spring–autumn); once monthly or less in winter | Pet-safe |
| Congo cockatoo impatiens | Bright indirect light (just back from a sunny window) | Every 3–5 days; keep soil evenly moist | Pet-safe |
| Conophytum (Living Pebbles) | Bright indirect light (just back from a sunny window) | Only when soil is bone-dry during the autumn-to-spring growth season; keep nearly dry in summer dormancy | Mildly toxic to pets |
| Conophytum Calculus | Bright indirect light (just back from a sunny window) | During autumn-to-spring growth, every 1-2 weeks; none through summer dormancy | Mildly toxic to pets |
| Conophytum Minutum | Bright indirect light (just back from a sunny window) | During the cool-season growth (autumn to spring), every 1-2 weeks; kept dry through summer dormancy | Mildly toxic to pets |
| Conophytum Pageae | Bright indirect light (just back from a sunny window) | Through autumn-to-spring growth, every 1-2 weeks; withheld over summer dormancy | Mildly toxic to pets |
| Conophytum Pellucidum | Bright indirect light (just back from a sunny window) | During autumn-to-spring growth, every 1-2 weeks; withheld over summer dormancy | Mildly toxic to pets |
| Conophytum Uviforme | Bright indirect light (just back from a sunny window) | Only during the cool autumn-to-spring growing season, roughly every 10-14 days when soil is dry; kept dry in summer | Mildly toxic to pets |
| Cooper's Haworthia | Bright indirect light (just back from a sunny window) | Every 1-3 weeks in spring/summer; about once a month in winter | Pet-safe |
| Cooper's Haworthia (Pilifera) | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Copiapoa cinerea | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; little to none in winter | Pet-safe |
| Copiapoa humilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep bone-dry in winter | Pet-safe |
| Copiapoa hypogaea | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; little to none in winter | Pet-safe |
| Copiapoa krainziana | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Coppertone Stonecrop | Direct sun (at least 4-6 hours) | Every 1-2 weeks in spring/summer; roughly monthly in winter | Pet-safe |
| Coquimbo Copiapoa | Direct sun (at least 4-6 hours) | Every 14-21 days in summer; once a month or less in winter | Pet-safe |
| Coral Cactus | Bright indirect light (just back from a sunny window) | Every 2-4 weeks; let the soil dry out almost fully between waterings | Toxic to pets |
| Coryphantha macromeris | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in growth; keep dry in winter | Pet-safe |
| 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 |
| Crassula Alstonii | Direct sun (at least 4-6 hours) | Sparingly, roughly every 2-3 weeks in active growth and barely at all in dormancy | Toxic to pets |
| Crassula Capitella | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crassula Columnaris | Direct sun (at least 4-6 hours) | Sparingly, roughly every 2-3 weeks in active growth and almost none during summer dormancy | Toxic to pets |
| Crassula Falcata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, monthly or less in winter | Toxic to pets |
| Crassula Hemisphaerica | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is fully dry, roughly every 10-14 days in growth; less in summer rest | Toxic to pets |
| Crassula Hummel's Sunset | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crassula Marnieriana | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 3-4 weeks in winter | Toxic to pets |
| Crassula Nudicaulis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Toxic to pets |
| Crassula Pellucida | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in growth and far less in winter | Toxic to pets |
| Crassula Pyramidalis | Bright indirect light (just back from a sunny window) | Sparingly, only when soil is bone dry, roughly every 2-3 weeks in growth; nearly dry over summer rest | Toxic to pets |
| Crassula Rupestris | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in summer; very sparingly in winter | Toxic to pets |
| Crassula Socialis | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 3-4 weeks in winter | Toxic to pets |
| Crassula Undulata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Toxic to pets |
| Crater Argyroderma | Direct sun (at least 4-6 hours) | Every 3–5 weeks in the autumn–winter growing period; none from May through August | Pet-safe |
| 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 Euphorbia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Cross Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once a month or less in winter | Pet-safe |
| Crown Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth; none from late autumn through winter | Pet-safe |
| Crown of Thorns | Direct sun (at least 4-6 hours) | Every 1-2 weeks in growth; sparingly in winter | Toxic to pets |
| Crystal Butterwort | Bright indirect light (just back from a sunny window) | Water lightly every 5–10 days during the carnivorous growing phase; allow to nearly dry between waterings in summer succulent-leaf phase | Pet-safe |
| Cuban Melon Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 3-4 weeks in winter | Pet-safe |
| Curio Articulatus | Bright indirect light (just back from a sunny window) | When the mix is dry through, roughly every 10-14 days in active growth and every 3-4 weeks while resting | Toxic to pets |
| Curio Citriformis | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, about every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Ficoides | Direct sun (at least 4-6 hours) | Water deeply only when the soil is fully dry, roughly every 2-3 weeks in summer and far less in winter | Toxic to pets |
| Curio Ficoides 'Mount Everest' | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in summer; sparingly in winter | Toxic to pets |
| Curio Radicans | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, about every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Rowleyanus | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Toxic to pets |
| Curio Talinoides var. mandraliscae | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days in growth | Toxic to pets |
| Curiosity Plant | Direct sun (at least 4-6 hours) | When the mix is dry, about every 2-3 weeks in summer; minimal in winter | Pet-safe |
| Cushion Aloe Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 7-12 days in summer, much less in winter | Pet-safe |
| Cut Eye-leaf | Direct sun (at least 4-6 hours) | Every 2-3 weeks in the autumn-spring growing season when the body shows light wrinkling; completely dry in summer | Mildly toxic to pets |
| Cylindrical Snake Plant | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring and summer; roughly monthly in winter | Toxic to pets |
| Dahlia 'Ace Summer Sunset' | Direct sun (at least 4-6 hours) | Water deeply 2-3 times a week in summer once established, more during heat | Toxic to pets |
| Dahlia 'Rip City' | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in summer | Toxic to pets |
| Deceptive Mammillaria | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Delta Vygie | Direct sun (at least 4-6 hours) | When the soil is fully dry, approximately every 10-14 days in the growing season; very sparingly once a month in winter | Pet-safe |
| Dense Trichodiadema | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn and spring flowering seasons; reduced to monthly or less in summer and winter | Pet-safe |
| Dense-flowered Pachypodium | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; minimal in winter | Toxic to pets |
| Desert Bromeliad | Direct sun (at least 4-6 hours) | every 14–21 days in summer, rarely in winter | Pet-safe |
| Desert Rose | Direct sun (at least 4-6 hours) | Every 7-10 days in active growth; roughly monthly in winter dormancy | Toxic to pets |
| Dinter's Living Stone | Direct sun (at least 4-6 hours) | Every 2-4 weeks in summer growing season; none during autumn-winter leaf renewal | Pet-safe |
| Disc Cactus | Direct sun (at least 4-6 hours) | When the mix has been completely dry for a few days, roughly every 14-21 days in summer; almost no water from October to March | Pet-safe |
| Dischidia Ruscifolia | Bright indirect light (just back from a sunny window) | When the medium is nearly dry, roughly every 7-10 days | Mildly toxic to pets |
| Disocactus phyllanthoides | 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 | Mildly toxic to pets |
| Distant-Flowered Dyckia | Direct sun (at least 4-6 hours) | Only when the potting mix is completely dry, roughly every 14-21 days in summer and every 30-45 days in winter | Mildly toxic to pets |
| Divergent Vanheerdea | Direct sun (at least 4-6 hours) | Every 14-21 days in the autumn-spring growing season when the leaves show slight wrinkling; completely dry in summer | Mildly toxic to pets |
| Dorothy's Living Stone | Direct sun (at least 4-6 hours) | Every 2-3 weeks in summer (active growth); none from mid-autumn to late spring during rest | Pet-safe |
| Dorothy's Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water only when the new leaf pair is actively growing (late summer to autumn); completely dry at all other times | Pet-safe |
| Dracaena Draco | Direct sun (at least 4-6 hours) | When the soil is mostly dry, roughly every 14-21 days | Toxic to pets |
| Dragon Fruit Cactus | 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 | Mildly toxic to pets |
| Duvalia caespitosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Duvalia corderoyi | Bright indirect light (just back from a sunny window) | When soil is completely dry, about every 10-14 days in summer; keep dry in winter | Mildly toxic to pets |
| Duvalia polita | Bright indirect light (just back from a sunny window) | When soil is fully dry, around every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Dwarf Antimima | Bright indirect light (just back from a sunny window) | Sparingly in summer; moderately in autumn–spring | Pet-safe |
| Dwarf Chin Cactus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Dwarf Frailea | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 12-16 days in summer | Pet-safe |
| Dwarf Tongue Plant | Direct sun (at least 4-6 hours) | Every 3–4 weeks during the growing season; once a month or less in winter | Pet-safe |
| Dyckia brevifolia | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Dyckia leptostachya | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Dyer's Ice Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growing season; reduce to monthly or less in winter | Pet-safe |
| Earth-colored Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during the active autumn-to-spring period; none in summer | Pet-safe |
| Easter Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3cm of compost dries, roughly weekly in growth | Pet-safe |
| Easter Lily Cactus | Direct sun (at least 4-6 hours) | When the top of the soil dries, roughly weekly to fortnightly in summer; keep almost dry in winter | Pet-safe |
| Easter Lily Cactus Clump | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Eastern Prickly Pear | Direct sun (at least 4-6 hours) | Sparingly when soil is dry; established plants tolerate long drought, every 2-4 weeks at most in summer | Pet-safe |
| Ebracteola montis-moltkei | Direct sun (at least 4-6 hours) | Only when soil is fully dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Echeveria | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer | Pet-safe |
| Echeveria 'Afterglow' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria 'Ice Green' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Echeveria 'Lola' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer | Pet-safe |
| Echeveria 'Meridian' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Echeveria 'Neon Breakers' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria 'Orion' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, far less in winter | Pet-safe |
| Echeveria 'Perle d'Azur' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, much less in winter | Pet-safe |
| Echeveria 'Purple Pearl' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-3 weeks in growth and much less in winter | Pet-safe |
| Echeveria agavoides | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria agavoides 'Ebony' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria harmsii | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria lilacina | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth and far less in winter | Pet-safe |
| Echeveria pallida | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer and much less in winter | Pet-safe |
| Echeveria pulidonis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria setosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Pet-safe |
| Echeveria strictiflora | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer, sparingly in winter | Pet-safe |
| Echeveria subsessilis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and monthly in winter | Pet-safe |
| Echidna Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 14-21 days in the growing season | Pet-safe |
| Echinocereus engelmannii | Direct sun (at least 4-6 hours) | When soil is fully dry in growing season, about every 10-14 days; keep dry in winter | Pet-safe |
| 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 |
| Echinopsis huascha | Direct sun (at least 4-6 hours) | Soak-and-dry; roughly every 10-14 days in active growth, none in winter | Pet-safe |
| Edible Fockea | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season (spring–autumn); once a month or less in winter | Mildly toxic to pets |
| Edithcolea grandis | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 10-14 days in warm growth; keep dry below 15C | Mildly toxic to pets |
| Elegant Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Elegant Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; reduce to every 3-4 weeks in winter | Pet-safe |
| Elephant's Foot Pachypodium | Direct sun (at least 4-6 hours) | When the top half to two-thirds of the soil is dry in the growing season, roughly every 10-14 days in summer; almost none in winter | Toxic to pets |
| Elkhorn Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in summer dormancy | Mildly toxic to pets |
| Engelmann's Prickly Pear | Direct sun (at least 4-6 hours) | Deeply but infrequently when soil is dry, every 2-4 weeks in summer; keep dry in winter | Pet-safe |
| Ermine Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days during the growing season; once every 4-6 weeks or less in winter | Mildly toxic to pets |
| Ernest's Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days during summer; reduce to once every 3-4 weeks in winter | Pet-safe |
| Espostoa lanata | Direct sun (at least 4-6 hours) | When the top few centimetres are dry, about every 2 weeks in summer; sparingly in winter | Pet-safe |
| Espostoa melanostele | Direct sun (at least 4-6 hours) | When the upper soil is dry, about every 2 weeks in summer; sparingly in winter | Pet-safe |
| Etched Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the autumn–spring growing period; completely dry through June–August | Pet-safe |
| Euphorbia aeruginosa | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer and monthly or less in winter | Toxic to pets |
| Euphorbia ammak | Direct sun (at least 4-6 hours) | When the top half of the soil is dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia antisyphilitica | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer, minimal in winter | Toxic to pets |
| Euphorbia bubalina | Bright indirect light (just back from a sunny window) | When the top few centimetres are dry, about weekly in summer; sparingly in winter | Toxic to pets |
| Euphorbia bupleurifolia | Bright indirect light (just back from a sunny window) | When the soil is dry while in leaf and active growth; keep nearly dry while leafless and dormant | Toxic to pets |
| Euphorbia caput-medusae | Direct sun (at least 4-6 hours) | When fully dry, about every 2 weeks in summer; minimal in winter | Toxic to pets |
| Euphorbia clavarioides | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; keep bone-dry in winter | Toxic to pets |
| Euphorbia columnaris | Direct sun (at least 4-6 hours) | When fully dry in warm growth, roughly every 2-3 weeks; almost none in winter | Toxic to pets |
| Euphorbia cooperi | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in summer; minimal in winter | Toxic to pets |
| Euphorbia decaryi | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in the growing season, sparingly in winter | Toxic to pets |
| Euphorbia enopla | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer; almost none in winter | Toxic to pets |
| Euphorbia esculenta | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, near-zero in winter | Toxic to pets |
| Euphorbia ferox | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; almost none in winter | Toxic to pets |
| Euphorbia flanaganii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in the growing season, monthly or less in winter | Toxic to pets |
| Euphorbia francoisii | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 1-2 weeks in the growing season, sparingly in winter | Toxic to pets |
| Euphorbia globosa | Direct sun (at least 4-6 hours) | When the soil is bone dry, about every 2-3 weeks in growth, almost none in winter | Toxic to pets |
| Euphorbia gorgonis | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| Euphorbia grandicornis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia groenewaldii | Direct sun (at least 4-6 hours) | When fully dry in the growing season, about every 2-3 weeks; almost none in winter | Toxic to pets |
| Euphorbia horrida | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia ingens | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia knuthii | Direct sun (at least 4-6 hours) | When fully dry in growth, about every 2-3 weeks; keep nearly dry in winter | Toxic to pets |
| Euphorbia lactea 'White Ghost' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia mammillaris | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Toxic to pets |
| Euphorbia meloformis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia milii 'Rosea' | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Euphorbia obesa subsp. symmetrica | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in active growth; nearly dry over winter | Toxic to pets |
| Euphorbia persistentifolia | Direct sun (at least 4-6 hours) | When the soil is dry, about every 1-2 weeks in summer; sparingly in winter | Toxic to pets |
| Euphorbia piscidermis | Direct sun (at least 4-6 hours) | Sparingly, only when bone dry, roughly every 3 weeks in growth, nearly none in winter | Toxic to pets |
| Euphorbia polygona | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Euphorbia pseudocactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; nearly none in winter | Toxic to pets |
| Euphorbia pulvinata | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth; near-zero in winter | Toxic to pets |
| Euphorbia resinifera | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; keep nearly dry in winter | Toxic to pets |
| Euphorbia schoenlandii | Direct sun (at least 4-6 hours) | When fully dry, roughly every 2-3 weeks in summer; nearly none in winter | Toxic to pets |
| Euphorbia stellata | Bright indirect light (just back from a sunny window) | Sparingly when fully dry in growth, roughly every 2-3 weeks in summer; none while dormant | Toxic to pets |
| Euphorbia suzannae | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in summer, sparse in winter | Toxic to pets |
| Euphorbia symmetrica | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| Euphorbia Trigona 'Rubra' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Euphorbia valida | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth, near-zero in winter | Toxic to pets |
| Fairy Castle Cactus | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; every 4-6 weeks in winter | Mildly toxic to pets |
| False Comb Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and essentially none in winter | Pet-safe |
| False Peyote | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 14-21 days in summer; minimal or none in winter | Pet-safe |
| Faucaria Bosscheana | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in growth and far less in winter | Mildly toxic to pets |
| Faucaria lupina | Direct sun (at least 4-6 hours) | When soil is fully dry, mainly in spring and autumn growth; reduce in summer and winter | Mildly toxic to pets |
| Faucaria Tuberculosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in active growth | Mildly toxic to pets |
| Feather Cactus | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; keep nearly dry in winter | Pet-safe |
| Ferocactus schwarzii | Direct sun (at least 4-6 hours) | Soak-and-dry, roughly every 10-14 days in summer; keep dry in winter | Pet-safe |
| Few-fruited Tongue Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; once monthly or less in winter | Mildly toxic to pets |
| Few-Ribbed Matucana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, every 7-14 days in summer | Pet-safe |
| Few-Toothed Tiger Jaws | Direct sun (at least 4-6 hours) | Every 2–4 weeks during active growth (late summer–autumn); sparingly in winter and spring | Pet-safe |
| Fida's Weingartia | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in spring and summer; suspend almost entirely from mid-autumn through winter. | Pet-safe |
| Fiebrig's Crown Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days in spring and summer; every 4-6 weeks in autumn; minimal to none in winter | Pet-safe |
| Fine-lined Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days in autumn to early spring only; completely withheld in summer and mid-winter | Pet-safe |
| Finger Cactus | Direct sun (at least 4-6 hours) | When the soil has dried fully, roughly every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Finger Mesemb | Direct sun (at least 4-6 hours) | Every 14-21 days in autumn through spring when the substrate is fully dry; essentially none during summer dormancy | Mildly toxic to pets |
| Fingertips | Bright indirect light (just back from a sunny window) | Every 2–3 weeks autumn through spring; minimal to none in summer | Pet-safe |
| Fire Crown Cactus | Direct sun (at least 4-6 hours) | When the mix is completely dry, about every 10-14 days in growth; withhold entirely in winter | Pet-safe |
| Firesticks Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Fishhook Barrel | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep dry in winter | Pet-safe |
| Fishhook Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 2-3 weeks in summer; little to none from late autumn through winter | Pet-safe |
| Fishhook Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Flat-Leaved Crassula | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, approximately every 10-14 days in summer | Toxic to pets |
| Flat-Leaved Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season; minimal in winter | Pet-safe |
| Fleshy Orbea | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 10-14 days in summer and monthly or less in winter | Mildly toxic to pets |
| Flying Saucer Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly weekly to fortnightly in summer; keep nearly dry in winter | Pet-safe |
| Forked Aichryson | Bright indirect light (just back from a sunny window) | Every 10–14 days during active growth; reduced in winter rest | Mildly toxic to pets |
| Fragrant Stomatium | Bright indirect light (just back from a sunny window) | Sparingly in summer; every 2–3 weeks in autumn–spring | Pet-safe |
| Franz's Living Stone | Direct sun (at least 4-6 hours) | Every 2-4 weeks in the summer growing season; completely dry from mid-autumn to late spring | Pet-safe |
| Friedrich's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn; none during summer dormancy | Pet-safe |
| Fringed Caralluma | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Mildly toxic to pets |
| Fringed Cliff Stonecrop | Direct sun (at least 4-6 hours) | Every 14–21 days in the growing season; minimal in winter | Pet-safe |
| Fringed Houseleek | Direct sun (at least 4-6 hours) | Low — water sparingly, allowing soil to dry fully | Pet-safe |
| Frithia humilis | Direct sun (at least 4-6 hours) | When soil is fully dry during spring-summer growth; minimal in winter | Pet-safe |
| Frithia pulchra | Direct sun (at least 4-6 hours) | When soil is fully dry during spring-summer growth; sparing in winter | Pet-safe |
| Fuller's Living Stone | Direct sun (at least 4-6 hours) | Only when the old lobe pair is fully shrivelled (summer dormancy) and during the active growing window autumn–spring; roughly every 14-21 days when active | Pet-safe |
| Fuller's Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; every 4-6 weeks or less in winter | Mildly toxic to pets |
| Fuller's Titanopsis | Direct sun (at least 4-6 hours) | Every 3–4 weeks in autumn/winter growing season; minimal in summer dormancy | Pet-safe |
| Fuller's Titanopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn to early spring; barely once a month in summer dormancy | Pet-safe |
| Furuse's Orostachys | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal watering in winter | Pet-safe |
| Gasteria (Ox Tongue) | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly or less in autumn/winter | Mildly toxic to pets |
| Gasteria Acinacifolia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Armstrongii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Batesiana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Glomerata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Nitida | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Obliqua | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Pillansii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 3 weeks in growth | Pet-safe |
| Gasteria Pulchra | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Gasteria Rawlinsonii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Geay's Pachypodium | Direct sun (at least 4-6 hours) | When the top half of the soil is dry during the growing season, roughly every 7-14 days in summer; minimal to none in winter | Toxic to pets |
| Gesine's Living Stone | Direct sun (at least 4-6 hours) | Approximately every 14-21 days during the autumn-spring active period only; none in summer dormancy | Pet-safe |
| Geyer's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active growth (autumn to early spring); none in summer | Pet-safe |
| Ghost Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer and monthly or less in winter | Pet-safe |
| Giant Chin Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-14 days in summer; every 4-6 weeks in winter | Pet-safe |
| Gibbaeum heathii | Direct sun (at least 4-6 hours) | Sparingly in autumn-spring growth; near-zero through summer dormancy | Mildly toxic to pets |
| Glandular Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly or not at all in winter | Pet-safe |
| Glandular-stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; monthly in winter | Mildly toxic to pets |
| Glasswort | Direct sun (at least 4-6 hours) | Keep consistently moist to wet | Mildly toxic to pets |
| Glory of Texas Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and once every 5-6 weeks in winter | Pet-safe |
| Goat's Horn Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep dry from late autumn through winter | Pet-safe |
| Goat's Horn Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Gold Tooth Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2 weeks in growth | Toxic to pets |
| Golden Ball Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, about every 7-10 days in summer; minimal in winter | Pet-safe |
| Golden Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Golden Cliff Stonecrop | Direct sun (at least 4-6 hours) | Every 10–14 days in spring and autumn; monthly in summer; very sparingly in winter | Pet-safe |
| Golden Easter Lily Cactus | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is completely dry, roughly every 10-14 days in the growing season; once a month or less in winter. | Pet-safe |
| Golden Eriosyce | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is completely dry, every 10-14 days in summer | Pet-safe |
| Golden Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks (allow soil to dry completely between waterings) | Pet-safe |
| Golden Lace Cactus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 2-3 weeks in summer; keep nearly dry in winter | Pet-safe |
| Golden Rat Tail Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer and every 3-4 weeks in winter | Pet-safe |
| Golden Star Cactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Golden Torch Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about weekly to fortnightly in summer; keep dry in winter | Pet-safe |
| Golden-flowered Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks during the growing season; minimally in winter | Pet-safe |
| Goldmoss Stonecrop | Direct sun (at least 4-6 hours) | Rarely — established plants rely on rainfall; water only in prolonged drought | Mildly toxic to pets |
| Gollum Jade | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Gout Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season; sparingly (every 3–4 weeks) in winter | Toxic to pets |
| Grandidier's Uncarina | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; withhold almost entirely October–March | Mildly toxic to pets |
| Graptopetalum amethystinum | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 12-16 days in summer, sparingly in winter | Pet-safe |
| Graptopetalum bellum | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 12-16 days in growth, very little in winter | Pet-safe |
| Graptopetalum macdougallii | Direct sun (at least 4-6 hours) | When the soil is completely dry, about every 12-16 days in summer, minimal in winter | Pet-safe |
| Graptopetalum pentandrum | Direct sun (at least 4-6 hours) | Every 2-3 weeks (less in winter) | Pet-safe |
| Graptopetalum rusbyi | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Graptosedum 'Francesco Baldi' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Graptosedum 'Vera Higgins' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Graptoveria 'Bashful' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, sparingly in winter | Mildly toxic to pets |
| Graptoveria 'Debbie' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, minimal in winter | Mildly toxic to pets |
| Graptoveria 'Fred Ives' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in growth | Pet-safe |
| Graptoveria 'Opalina' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, sparingly in winter | Mildly toxic to pets |
| Graptoveria 'Silver Star' | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in growth, minimal in winter | Mildly toxic to pets |
| Graptoveria 'Titubans' | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in growth, far less in winter | Pet-safe |
| Gray Organ Pipe | Direct sun (at least 4-6 hours) | When the top half of soil is dry, roughly every 10-14 days in summer; very infrequently in winter | Pet-safe |
| Greater Sea Spurrey | Direct sun (at least 4-6 hours) | Minimal supplemental watering; relies on coastal rainfall and tidal humidity | Mildly toxic to pets |
| Greene's Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks during active growth (autumn–spring); very little to none in summer | Pet-safe |
| Guatemalan Ponytail Palm | Bright indirect light (just back from a sunny window) | Every 14–21 days in summer; every 28–42 days in winter | Mildly toxic to pets |
| Gummy Uebelmannia | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, approximately every 10-14 days in summer; barely once a month in winter | Pet-safe |
| Gypsicola Butterwort | Bright indirect light (just back from a sunny window) | Keep damp via a shallow tray during summer growth; water sparingly once the succulent winter rosette forms | Mildly toxic to pets |
| Gypsum Butterwort | Bright indirect light (just back from a sunny window) | Tray-water sparingly in summer; near-dry in winter dormancy | Mildly toxic to pets |
| Hairy Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; once monthly or less in winter | Mildly toxic to pets |
| Hairy Gibbaeum | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in winter and spring (active season); dry in summer | Pet-safe |
| Hairy Houseleek | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; once a month or less in winter | Pet-safe |
| Hairy Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks during the growing season; sparingly in winter | Pet-safe |
| Hairy-Fruited Wickerware Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; reduce to every 14-21 days in winter | Pet-safe |
| Hairy-leaf Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the active (cool) season; minimal or none in summer | Toxic to pets |
| Hall's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active growth (autumn to early spring); none in summer dormancy | Pet-safe |
| Hall's Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water in autumn (September–November) only; completely dry in winter and summer | Pet-safe |
| Hardy Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active growth; keep dry in winter | Mildly toxic to pets |
| Hasse's Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); virtually none in summer | Pet-safe |
| Hatchet Cactus | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 14-21 days in summer; very sparingly in winter (once every 4-6 weeks) | Pet-safe |
| Hausa Potato | Bright indirect light (just back from a sunny window) | Regularly to keep soil evenly moist; approximately every 3-4 days in warm weather | Mildly toxic to pets |
| Haussknecht's Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in growing season (spring–summer); every 4–6 weeks or rainfall-only in winter | Pet-safe |
| Haworthia | Bright indirect light (just back from a sunny window) | When the soil is dry, every 2-3 weeks | Pet-safe |
| Haworthia Herbacea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Magnifica | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Obtusa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in growth | Pet-safe |
| Haworthia Tessellata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthia Turgida | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 7-12 days in summer, sparse in winter | Pet-safe |
| Haworthia Venosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Haworthiopsis Viscosa | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Hayne's Matucana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 7-14 days in summer | Pet-safe |
| Hechtia texensis | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| 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 |
| Helmut's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active autumn-to-spring growth only; strictly none in summer | Pet-safe |
| Hemiboea subcapitata | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Mildly toxic to pets |
| Hens and chicks | Direct sun (at least 4-6 hours) | Only when soil is fully dry; roughly every 1-2 weeks in summer, every 4-6 weeks in winter | Pet-safe |
| Herre's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during autumn-to-spring active period; none in summer | Pet-safe |
| Heuffel's Houseleek | Direct sun (at least 4-6 hours) | Low — allow to dry between waterings | Mildly toxic to pets |
| Heuffel's Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; rarely in winter | Pet-safe |
| Hikuri | Direct sun (at least 4-6 hours) | Sparingly: only when soil is fully dry, roughly every 2-3 weeks in summer, none in winter | Toxic to pets |
| Hindu Rope Plant | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of compost is dry, roughly every 10-14 days in summer | Pet-safe |
| Hobbit Jade | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is fully dry, about every 2-3 weeks; less in winter | Toxic to pets |
| Hoodia gordonii | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in summer; keep nearly dry October-March | Mildly toxic to pets |
| Hoodia parviflora | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| 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 |
| Horn-Bearing Coryphantha | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Horned Eriosyce | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once a month or less in winter | Pet-safe |
| Horst's Discocactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; reduce to once a month or less in winter | Pet-safe |
| Horst's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in summer; every 3-4 weeks in winter | Pet-safe |
| Hottentot Fig | Direct sun (at least 4-6 hours) | Every 3–4 weeks; largely self-sufficient in coastal and Mediterranean climates | Mildly toxic to pets |
| Houseleek Cliff Stonecrop | Direct sun (at least 4-6 hours) | Every 14–21 days in the growing season; very sparingly in winter | Pet-safe |
| Houseleek Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Pet-safe |
| 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 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 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 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 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 Retusa | Bright indirect light (just back from a sunny window) | Every 7-10 days in spring/summer; reduce sharply in winter | Pet-safe |
| Huernia brevirostris | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| Huernia keniensis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Huernia macrocarpa | Bright indirect light (just back from a sunny window) | When the soil is dry, about every 1-2 weeks in warm growth | Mildly toxic to pets |
| Huernia pillansii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 12-16 days in summer; rarely in winter | Mildly toxic to pets |
| Huernia schneideriana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Mildly toxic to pets |
| Huernia thuretii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Huernia zebrina | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Mildly toxic to pets |
| Humboldt's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 5-6 weeks in winter | Pet-safe |
| Hunchback Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Hylotelephium 'Autumn Joy' | Direct sun (at least 4-6 hours) | Roughly every 10-14 days in its first season; established plants rarely need watering | Pet-safe |
| Hylotelephium 'Purple Emperor' | Direct sun (at least 4-6 hours) | Every 10-14 days when young; established plants need little to no watering | Pet-safe |
| Hylotelephium spectabile 'Brilliant' | Direct sun (at least 4-6 hours) | Every 10-14 days while establishing; mature clumps rely on rainfall | Pet-safe |
| Hylotelephium telephium 'Munstead Dark Red' | Direct sun (at least 4-6 hours) | Every 10-14 days while establishing; mature plants are largely self-reliant | Pet-safe |
| Ice Plant | Direct sun (at least 4-6 hours) | Every 10-14 days during establishment; mature clumps rely on rainfall | Pet-safe |
| Impala Lily | Direct sun (at least 4-6 hours) | Every 7–10 days in warm growing season; withhold almost entirely during dormancy (autumn–late winter) | Toxic to pets |
| Inch Plant | Bright indirect light (just back from a sunny window) | Roughly weekly in summer; every 10-14 days in winter | Toxic to pets |
| Inch Plant 'Nanouk' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Indian Fig Opuntia | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Indian Head Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 7-10 days in spring and summer; every 3-4 weeks in autumn; minimal in winter | Pet-safe |
| Indian Head Notocactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in the active growing season; reduce to once every 5-8 weeks in winter | Pet-safe |
| Indian Sinocrassula | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; monthly or less in winter | Mildly toxic to pets |
| Inflated Wax Plant | Bright indirect light (just back from a sunny window) | Every 14–21 days in summer, every 4–6 weeks in winter | Pet-safe |
| Isalo Adenia | Bright indirect light (just back from a sunny window) | Every 10–14 days in summer; withhold almost entirely in winter | Toxic to pets |
| Island Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in active season (October–April); none to minimal in summer | Pet-safe |
| Jade plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| Japanese Dunce Cap | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season; reduce significantly in winter dormancy | Pet-safe |
| Jewel Orchid | Bright indirect light (just back from a sunny window) | Every 7-10 days; keep the mix evenly moist, never bone dry | Pet-safe |
| Jointed Pectinaria | Direct sun (at least 4-6 hours) | Every 3–4 weeks during the growing season; almost dry in summer and winter | Mildly toxic to pets |
| Jordaaniella cuprea | Direct sun (at least 4-6 hours) | When the top few centimetres of soil are dry, about every 7-12 days in growth; reduce sharply in cold or dormancy | Mildly toxic to pets |
| Kalanchoe | Direct sun (at least 4-6 hours) | When the soil is dry, every 10-14 days | Toxic to pets |
| Kalanchoe 'Calandiva' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is fully dry, roughly every 7-14 days | Toxic to pets |
| Kalanchoe 'Kerinci' | Bright indirect light (just back from a sunny window) | When the soil is dry to about halfway down, every 10-14 days | Toxic to pets |
| Kalanchoe Beharensis | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Eriophylla | Bright indirect light (just back from a sunny window) | When the soil is dry to a depth of 3-4 cm, roughly every 10-14 days in growth | Toxic to pets |
| Kalanchoe Fedtschenkoi | Bright indirect light (just back from a sunny window) | When the top of the soil is dry, about every 1-2 weeks in summer, every 3-4 weeks in winter | Toxic to pets |
| Kalanchoe Longiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Kalanchoe Marmorata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in summer and every 2-3 weeks in winter | Toxic to pets |
| Kalanchoe Orgyalis | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Pumila | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 1-2 weeks in summer, every 3-4 weeks in winter | Toxic to pets |
| Kalanchoe Rhombopilosa | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kalanchoe Tomentosa 'Chocolate Soldier' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly in winter | Toxic to pets |
| Kamchatka Stonecrop | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days; very infrequently once established | Pet-safe |
| Karas Mountains Living Stones | Direct sun (at least 4-6 hours) | Only during the active growth window: water sparingly when new leaves are developing (roughly autumn to late spring). Withhold water entirely in summer dormancy. | Pet-safe |
| Kirk's Huernia | Bright indirect light (just back from a sunny window) | Every 14–21 days when growing (spring–autumn); once monthly or less in winter | Pet-safe |
| Kiwi Aeonium | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 7-12 days in active growth | Mildly toxic to pets |
| Lace Aloe | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Lady Finger Cactus | Direct sun (at least 4-6 hours) | Roughly every 2-3 weeks in summer; far less in winter | Pet-safe |
| Lady of the Night | Bright indirect light (just back from a sunny window) | When fully dry, roughly every 7-10 days | Pet-safe |
| Laguna Beach Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days from autumn through spring; withhold almost entirely in summer | Pet-safe |
| Lamb's Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; once monthly or less in winter | Mildly toxic to pets |
| Lance-leaf Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days in winter and spring (active season); withhold almost entirely in summer | Pet-safe |
| Large-Flowered Copiapoa | Direct sun (at least 4-6 hours) | Every 14-21 days in summer; once a month or dry in winter | Pet-safe |
| Large-Flowered Houseleek | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in prolonged dry periods | Pet-safe |
| Larryleachia marlothii | Bright indirect light (just back from a sunny window) | Sparingly; only when fully dry, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| Lau's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 5-6 weeks in winter | Pet-safe |
| Lau's Turbinicarpus | Direct sun (at least 4-6 hours) | When soil is completely dry, approximately every 14-21 days in summer; minimal or no water in winter | Pet-safe |
| Leaf-Spined Brain Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-14 days during summer; once every 4-6 weeks in winter | Pet-safe |
| Lebanese Rosularia | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in winter | Pet-safe |
| Lehmann's Ice Plant | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in spring-summer; very sparingly in winter (once every 3-4 weeks) | Pet-safe |
| Lehmann's Iceplant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during spring and summer; monthly or less in winter | Pet-safe |
| Levy's Huernia | Bright indirect light (just back from a sunny window) | Every 14–21 days during active growth (spring–autumn); once monthly or less in winter | Pet-safe |
| Lion's Angraecum | Bright indirect light (just back from a sunny window) | When roots are silvery and the medium approaches dryness, roughly every 7-10 days in summer | Pet-safe |
| Lipstick Echeveria | Direct sun (at least 4-6 hours) | Every 1-2 weeks in spring/summer; sparingly in winter | Pet-safe |
| Lithops Aucampiae | Direct sun (at least 4-6 hours) | Strictly seasonal: water in spring and autumn only, never in summer dormancy or mid-winter | Pet-safe |
| Lithops Divergens | Direct sun (at least 4-6 hours) | Only in autumn and spring growth, sparingly when soil is bone dry; no water during summer or mid-winter rest | Pet-safe |
| Lithops Hookeri | Direct sun (at least 4-6 hours) | Strictly seasonal: water in spring and autumn only, never during summer dormancy or mid-winter | Pet-safe |
| Lithops Lesliei | Direct sun (at least 4-6 hours) | Strictly seasonal: water in spring and autumn only, never during summer dormancy or mid-winter | Pet-safe |
| Lithops Salicola | Bright indirect light (just back from a sunny window) | Only during active growth (autumn and spring), roughly every 2-3 weeks; none in summer or deep winter | Pet-safe |
| Living Rock Cactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 21-30 days in summer; essentially none in winter | Pet-safe |
| Lobivia famatimensis | Direct sun (at least 4-6 hours) | Water thoroughly when the mix dries out, roughly every 1-2 weeks in summer; keep dry through winter | Pet-safe |
| Long Eye-leaf | Direct sun (at least 4-6 hours) | Every 14-21 days during the autumn-to-spring growing season when the old body wrinkles; completely dry from late spring through summer | Mildly toxic to pets |
| Long-Leaved Pachyphytum | Direct sun (at least 4-6 hours) | Every 2–3 weeks in spring and summer; every 4–6 weeks in autumn and winter | Pet-safe |
| Long-tongue Tongue Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer; monthly or less in winter | Mildly toxic to pets |
| Loose Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in winter | Mildly toxic to pets |
| Loose-flowered Monanthes | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in spring and summer; every 4–6 weeks or less in winter | Mildly toxic to pets |
| Lydia's Eye-leaf | Direct sun (at least 4-6 hours) | Every 14-21 days in autumn through spring when the body wrinkles; none at all from late spring through summer | Mildly toxic to pets |
| Madagascar Palm | Direct sun (at least 4-6 hours) | Every 1–2 weeks in summer; once or twice monthly in winter | Toxic to pets |
| Madison's Matucana | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, every 10-14 days in summer | Pet-safe |
| Mammillaria bombycina | Direct sun (at least 4-6 hours) | Water thoroughly when the soil is fully dry, roughly every 1-2 weeks in summer; keep nearly dry in winter | Pet-safe |
| Mammillaria mystax | Direct sun (at least 4-6 hours) | Water deeply when the mix is completely dry, about every 1-2 weeks in summer; keep dry in winter | Pet-safe |
| Many-Flowered Ruschia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (autumn–spring); very sparingly in summer | Mildly toxic to pets |
| Many-Headed Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and essentially none in winter | Pet-safe |
| Many-Leaved Monanthes | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in the growing season; reduced in summer heat | Pet-safe |
| Many-Nippled Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Marble Houseleek | Direct sun (at least 4-6 hours) | Every 2–4 weeks in growing season; once a month or less in winter | Pet-safe |
| Marbled Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during the autumn-to-spring active period; completely dry in summer | Pet-safe |
| Marbled Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water only in autumn during new-leaf emergence (September–November); completely dry rest of year | Pet-safe |
| Margined Copiapoa | Direct sun (at least 4-6 hours) | When the soil is completely dry throughout, roughly every 14-21 days in summer; monthly or less in winter | Pet-safe |
| Marson's Crown Cactus | Direct sun (at least 4-6 hours) | Every 7-14 days in active growth; once every 4-6 weeks in winter | Pet-safe |
| Marson's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-12 days in summer; monthly or less in winter | Pet-safe |
| Maughan's Cone Plant | Direct sun (at least 4-6 hours) | Every 2–4 weeks in autumn growth phase; none during summer dormancy | Pet-safe |
| Maughan's Cone Plant | Direct sun (at least 4-6 hours) | Every 3–4 weeks during the autumn–winter–spring growing period; none from June to late August | Pet-safe |
| McDowell's Thelocactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 14-21 days in summer; once a month or less in winter. | Pet-safe |
| Melocactus bahiensis | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 1-2 weeks in warm summer growth; sparingly in winter | Mildly toxic to pets |
| Melocactus peruvianus | Direct sun (at least 4-6 hours) | When soil is completely dry, about every 1-2 weeks in warm summer growth; minimal in winter | Mildly toxic to pets |
| Mendoza Graptopetalum | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 10-14 days in summer | Pet-safe |
| Mexican Butterwort | Bright indirect light (just back from a sunny window) | Keep moist spring-summer; ease off in winter | Mildly toxic to pets |
| Mexican Butterwort | Bright indirect light (just back from a sunny window) | Tray-water during growth; keep barely damp in winter | Mildly toxic to pets |
| Mexican Butterwort | Bright indirect light (just back from a sunny window) | Tray-water in summer; near-dry in winter | Mildly toxic to pets |
| Mexican Giant Cardon | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer; minimal in winter | Mildly toxic to pets |
| Mexican Lime Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and every 4-6 weeks in winter | Pet-safe |
| Mexican Pincushion | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer and once a month or less in winter | Pet-safe |
| Mexican Snowball | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly in winter | Pet-safe |
| Miniature Cone Plant | Bright indirect light (just back from a sunny window) | Every 10–14 days during active growth (autumn–spring); completely dry through summer dormancy | Pet-safe |
| Miniature Desert Rose | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Pet-safe |
| Missouri Foxtail Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-21 days in summer; virtually none in winter | Pet-safe |
| Mistletoe cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in growth | Pet-safe |
| Moctezuma Butterwort | Bright indirect light (just back from a sunny window) | Tray-water in summer; near-dry in winter | Mildly toxic to pets |
| Mona Lisa Lipstick Plant | Bright indirect light (just back from a sunny window) | Every 7–10 days in active growth; every 14 days in cooler months | Pet-safe |
| Monk's Hood Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 2-3 weeks in the growing season; keep dry in winter | Pet-safe |
| Monk's Hood Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 10-14 days in summer; every 4-6 weeks or less in winter | Pet-safe |
| Moon Cactus | Bright indirect light (just back from a sunny window) | Every 14–21 days in spring/summer; every 4–6 weeks in autumn; almost none in winter | Pet-safe |
| 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 |
| Moonstones | Bright indirect light (just back from a sunny window) | Every 2 to 3 weeks in active growth; roughly monthly or less in winter | Pet-safe |
| Moser's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in summer; every 4-6 weeks in winter | Pet-safe |
| Mother of Hundreds | Direct sun (at least 4-6 hours) | Every 10-14 days in spring-summer when the top 3 cm of soil is dry; every 4-6 weeks in autumn and winter | Pet-safe |
| Mother of thousands | Bright indirect light (just back from a sunny window) | When the top 5 cm (2 in) of soil is dry, roughly every 1-2 weeks in growth | Toxic to pets |
| Mother of Thousands | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer | Toxic to pets |
| Mountain Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Muir's Living Pebble | Direct sun (at least 4-6 hours) | Only when the body begins to slightly wrinkle, roughly every 3-4 weeks during the autumn-spring growing season; completely dry through summer dormancy | Mildly toxic to pets |
| Muir's Rhinephyllum | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 21-28 days in the growing season (autumn-spring); almost none in summer | Mildly toxic to pets |
| Myrtillocactus geometrizans | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 1-2 weeks in summer; sparingly in winter | Mildly toxic to pets |
| Namaqualand Cheiridopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn through early spring; completely dry June–August | Pet-safe |
| Nananthus transvaalensis | Direct sun (at least 4-6 hours) | Only when soil is bone dry, about every 10-14 days in growth; minimal in summer and winter dormancy | Mildly toxic to pets |
| Narvaez Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Naureen's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during the active autumn-to-spring period; completely dry in summer | Pet-safe |
| Nejapa Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer; once every 5-8 weeks in winter | Pet-safe |
| Nel's Tongue Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; once a month or less in winter | Mildly toxic to pets |
| Neli's Rhombophyllum | Bright indirect light (just back from a sunny window) | Every 3–4 weeks in growing season (autumn–spring); withhold almost entirely in summer | Mildly toxic to pets |
| Neli's Tongue Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in autumn and spring growing seasons; near-dry in summer dormancy and restricted in winter | Mildly toxic to pets |
| Nery's Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; reduce to every 4 weeks in winter | Pet-safe |
| New Guinea Impatiens | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, often every 1-3 days in warm weather | Pet-safe |
| New Zealand Spinach | Direct sun (at least 4-6 hours) | Once or twice per week | Pet-safe |
| Night-Blooming Cereus | Bright indirect light (just back from a sunny window) | When the top few cm of mix is dry, roughly every 1-2 weeks in growth | Pet-safe |
| Noble Aeonium | Bright indirect light (just back from a sunny window) | Every 1–2 weeks in the active season (autumn to spring); minimal or none in summer | Mildly toxic to pets |
| Noble Carrion Flower | Bright indirect light (just back from a sunny window) | Every 14–21 days in the growing season; once monthly or less in winter | Pet-safe |
| Notch Cactus | Bright indirect light (just back from a sunny window) | When the mix is fully dry, sparingly every 2-3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Notch-Tipped Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days in the growing season; every 3–4 weeks in winter | Pet-safe |
| Notched Butterwort | Medium indirect light (a couple of metres from a window) | Keep consistently moist; reduce slightly in cooler months | Mildly toxic to pets |
| Notocactus Magnificus | Direct sun (at least 4-6 hours) | Soak-and-dry: water deeply only when the mix is completely dry, roughly every 10-14 days in summer | Mildly toxic to pets |
| October Daphne | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; minimal in winter dormancy | Pet-safe |
| Old Father Live Forever | Bright indirect light (just back from a sunny window) | Water when the top 3–5 cm of compost is dry, roughly every 10–14 days; reduce in winter | Toxic to pets |
| Old Lady Pincushion | Direct sun (at least 4-6 hours) | When the mix is completely dry, roughly every 2-3 weeks in summer; keep nearly dry in winter | Pet-safe |
| Old Lady Pincushion | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Old Man Cactus | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 2-3 weeks in summer, very little in winter | Pet-safe |
| Old Man Eriosyce | Direct sun (at least 4-6 hours) | When the potting mix has dried out completely, roughly every 14-21 days in the growing season | Pet-safe |
| Old Man of the Andes | Direct sun (at least 4-6 hours) | When the soil has dried out, about every 2 weeks in summer; very sparingly in winter | Mildly toxic to pets |
| Old Man Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Old Woman Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, every 10-14 days in summer | Pet-safe |
| Olive Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active growth (autumn to early spring); none in summer | Pet-safe |
| Olive Living Stones | Direct sun (at least 4-6 hours) | Seasonally — autumn watering only (September–November); completely dry during winter and summer dormancy | Pet-safe |
| Opposite-leaf Cliff Stonecrop | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; very rarely in winter | Pet-safe |
| Optical Plant | Direct sun (at least 4-6 hours) | Seasonally — water only during autumn active growth (September–November); completely dry rest of year | Pet-safe |
| Orange Snow Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, roughly every 7-10 days in spring and summer; every 4-6 weeks in autumn; none or barely any in winter | Pet-safe |
| Orange-Flowered Matucana | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer | Pet-safe |
| Orbea ciliata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; rarely in winter | Mildly toxic to pets |
| Orbea decaisneana | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in summer; minimal in winter | Mildly toxic to pets |
| Orbea lutea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in summer; rarely in winter | Mildly toxic to pets |
| Orcutt's Liveforever | Direct sun (at least 4-6 hours) | Every 1–2 weeks in autumn through spring (growing season); withhold almost entirely in summer | Pet-safe |
| Oregon Stonecrop | Bright indirect light (just back from a sunny window) | Every 10-14 days in active growth; monthly or less in winter | Pet-safe |
| Orpen's Aloinopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn through early spring; once a month or not at all through summer | Pet-safe |
| Orpine | Direct sun (at least 4-6 hours) | Every 1–2 weeks during dry spells; drought-tolerant once established | Mildly toxic to pets |
| Orssich's Holiday Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season; reduce to every 2-3 weeks during the autumn rest | Pet-safe |
| Owl Eye Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 10-14 days in summer; once every 5-8 weeks in winter | Pet-safe |
| Owl Eyes Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 2-3 weeks in spring and summer; nearly dry in winter | Pet-safe |
| Ox Tongue | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer, monthly or less in winter | Pet-safe |
| Ox Tongue Plant | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Pachycereus schottii | Direct sun (at least 4-6 hours) | When soil is fully dry, about every 2-3 weeks in summer; sparingly in winter | Mildly toxic to pets |
| Pachyphytum glutinicaule | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, very sparingly in winter | Pet-safe |
| 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 |
| Pale Coryphantha | Direct sun (at least 4-6 hours) | When the soil is fully dry, every 10-14 days in summer; every 4-6 weeks or less in winter | Pet-safe |
| Pale Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more frequent in first season | Pet-safe |
| Panda Plant | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer | Toxic to pets |
| Paper Spine Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer and roughly monthly or less in winter | Pet-safe |
| Pazazz Mix Portulaca | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 7-14 days | Mildly toxic to pets |
| Pearson's Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn to early spring); once per month or less in summer | Toxic to pets |
| Pebbled Tiger Jaws | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 14–21 days in the growing season and sparingly every 4–6 weeks in winter | Mildly toxic to pets |
| Pelargonium carnosum | Direct sun (at least 4-6 hours) | When the gritty mix is fully dry, about every 10-14 days in growth; sparingly in summer dormancy | Toxic to pets |
| Pelargonium echinatum | Direct sun (at least 4-6 hours) | Sparingly in the autumn-to-spring growing season; keep nearly dry in summer dormancy | Toxic to pets |
| Pellionia daveauana | Medium indirect light (a couple of metres from a window) | When the top 1-2 cm of soil begins to dry, often every 4-7 days | Pet-safe |
| Pencil Cactus (Firestick) | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Toxic to pets |
| Pencil Cactus Rhipsalis | 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 |
| Pencil-leaf Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn–spring); once per month in summer | Toxic to pets |
| Peperomia asperula | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days | Pet-safe |
| Peperomia axillaris | Bright indirect light (just back from a sunny window) | When the soil is almost fully dry, roughly every 12-16 days | Pet-safe |
| Peperomia columella | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-21 days in growth | Pet-safe |
| Peperomia dolabriformis | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 14-21 days | Pet-safe |
| Peperomia ecklonii | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is dry, roughly every 10-14 days | Pet-safe |
| Peperomia graveolens 'Ruby Glow' | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-18 days | Pet-safe |
| Peperomia magnoliifolia | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 7-12 days | Pet-safe |
| Peperomia magnoliifolia 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 8-13 days | Pet-safe |
| Peperomia nivalis | Bright indirect light (just back from a sunny window) | When the soil is dry, roughly every 7-14 days in growth | 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 |
| Perez de la Rosa's Mammillaria | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 6 weeks in winter | Pet-safe |
| Perplexing Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season; nearly dry from October to February | Pet-safe |
| Perplexing Rebutia | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; every 3–4 weeks in autumn; once monthly or none in winter | Pet-safe |
| Peruvian Apple Cactus | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; roughly monthly or less in winter | Pet-safe |
| Peruvian Old Man Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Peruvian Oroya | Direct sun (at least 4-6 hours) | When the top 4-5 cm of soil is dry, every 10-14 days in summer | Pet-safe |
| Peyote | Direct sun (at least 4-6 hours) | Sparingly: only when soil is fully dry, roughly every 2-3 weeks in summer, none in winter | Toxic to pets |
| Peyote-Like Turbinicarpus | Bright indirect light (just back from a sunny window) | When the soil is completely dry, roughly every 14-21 days in summer and once a month or less in winter | Pet-safe |
| Pflanz's Chin Cactus | Medium indirect light (a couple of metres from a window) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer; reduce to once every 4-6 weeks in winter | Pet-safe |
| Piaranthus geminatus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Piaranthus punctatus | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in summer; keep nearly dry in winter | Mildly toxic to pets |
| Pickle Plant | Bright indirect light (just back from a sunny window) | Every 2–4 weeks; reduce to monthly or less in winter | Pet-safe |
| Pig's Ear | Bright indirect light (just back from a sunny window) | When the soil is almost completely dry, roughly every 14 days in summer | Toxic to pets |
| Pilea pumila | Medium indirect light (a couple of metres from a window) | Keep consistently moist; check every 2-4 days | Pet-safe |
| Pilea serpyllacea | Bright indirect light (just back from a sunny window) | When the surface just begins to dry, roughly every 4-7 days | Pet-safe |
| Pillans' Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during late summer through early spring; fully dry in June–August | Pet-safe |
| Pima Pineapple Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Pincushion Cactus | Direct sun (at least 4-6 hours) | Every 10–14 days in spring/summer; monthly or less in autumn; none in winter | Pet-safe |
| Pinecone Cactus | Direct sun (at least 4-6 hours) | When the mix is bone dry, roughly every 14-21 days in the growing season; once a month or less from October to February | Pet-safe |
| Pinguicula 'Aphrodite' | Bright indirect light (just back from a sunny window) | Tray-water to keep the mix moist in growth; reduce for the drier winter rest | Mildly toxic to pets |
| Pinguicula 'Tina' | Bright indirect light (just back from a sunny window) | Keep lightly moist in summer; let the surface dry slightly between waterings in winter | Mildly toxic to pets |
| Pinguicula agnata | Bright indirect light (just back from a sunny window) | Keep the mix damp by tray-watering during growth; let it dry slightly in winter dormancy | Mildly toxic to pets |
| Pinguicula cyclosecta | Bright indirect light (just back from a sunny window) | Keep the medium damp via tray-watering in growth; nearly dry in winter dormancy | Mildly toxic to pets |
| Pinguicula Esseriana | Bright indirect light (just back from a sunny window) | Keep the gritty mix lightly moist in summer; let it dry considerably through the winter succulent phase | Mildly toxic to pets |
| Pinguicula Gigantea | Bright indirect light (just back from a sunny window) | Keep lightly moist in summer growth; let the surface dry slightly between waterings in the cooler 'winter succulent' phase | Mildly toxic to pets |
| Pinguicula laueana | Bright indirect light (just back from a sunny window) | Tray-water to keep the mix moist in summer; ease off for the dry winter rest | Mildly toxic to pets |
| Pink Butterflies Kalanchoe | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in summer; far less in winter | Toxic to pets |
| Pink Dragon Fruit | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Pink 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 Vygie | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is fully dry, roughly every 7-14 days in spring-summer; very sparingly in winter (once monthly or less) | Pet-safe |
| Pitton's Houseleek | Direct sun (at least 4-6 hours) | Every 2–3 weeks in summer; monthly or less in winter | Pet-safe |
| Plains Prickly Pear | Direct sun (at least 4-6 hours) | Every 2-3 weeks in the growing season (spring–summer); withhold almost entirely in autumn and winter | Mildly toxic to pets |
| Pleasant Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks during autumn growth; none in summer | Pet-safe |
| Pleiospilos nelii 'Royal Flush' | Direct sun (at least 4-6 hours) | Sparingly; soak only when soil is fully dry and leaves slightly wrinkle, roughly every 3-4 weeks in growth | Mildly toxic to pets |
| Plover Eggs | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (spring–autumn); once a month or less in winter | Pet-safe |
| Poisonous Adenia | Direct sun (at least 4-6 hours) | Every 2–4 weeks during summer growing season; completely withheld in winter | Toxic to pets |
| Ponytail palm | Direct sun (at least 4-6 hours) | When the soil is bone dry, every 2-3 weeks | Pet-safe |
| Portulaca grandiflora 'Sundial Mango' | Direct sun (at least 4-6 hours) | When the soil is dry several centimetres down, roughly every 7-10 days; less in cool spells | Toxic to pets |
| Portulaca oleracea 'Fairytales Cinderella' | Direct sun (at least 4-6 hours) | When the soil has dried several centimetres down, about every 7-10 days; more often only in extreme heat | Toxic to pets |
| Powder Puff Cactus | Direct sun (at least 4-6 hours) | When the soil is bone dry, roughly every 2-3 weeks in spring and summer; little to none in winter | Pet-safe |
| Powder Puff Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in spring and summer; once every 4-6 weeks in winter | Pet-safe |
| Pretty Living Stone | Direct sun (at least 4-6 hours) | Only when the old leaf pair is fully shrivelled (during active growth, roughly every 2-3 weeks); no water during leaf renewal | Pet-safe |
| Pretty Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Prickly Ice Plant | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in spring and summer; once monthly or less in winter | Pet-safe |
| Prickly Pear Cactus | Direct sun (at least 4-6 hours) | Deeply but infrequently when soil is dry, every 2-4 weeks in the growing season; keep nearly dry in winter | Pet-safe |
| Primos' Vanheerdea | Direct sun (at least 4-6 hours) | Every 14-21 days during autumn to spring when the soil is completely dry; no water in summer | Mildly toxic to pets |
| Primrose Huernia | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in summer; monthly or less in winter | Mildly toxic to pets |
| Pseudolithos cubiformis | Bright indirect light (just back from a sunny window) | Very sparingly; only when fully dry and the body begins to soften, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| Pseudolithos migiurtinus | Bright indirect light (just back from a sunny window) | Very sparingly; only when fully dry, roughly every 2-3 weeks in warm growth | Mildly toxic to pets |
| Purple Fingers | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn through early spring; none in summer | Pet-safe |
| Purple Glasswort | Direct sun (at least 4-6 hours) | Keep consistently moist to wet with saline water | Mildly toxic to pets |
| Purple Heart | Bright indirect light (just back from a sunny window) | When the top inch of soil dries out, roughly weekly in summer and every 2 weeks in winter | Toxic to pets |
| Purple Prickly Pear | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer and almost never in winter | Pet-safe |
| Purple Rose Tree | Direct sun (at least 4-6 hours) | Every 1–2 weeks in autumn and winter (active growing season); reduce to monthly or suspend in summer dormancy | Mildly toxic to pets |
| Purple Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more in active growth | Pet-safe |
| Pussy Ears Plant | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days in summer | Mildly toxic to pets |
| Pygmy Tongue Plant | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer; once every 4-6 weeks or less in winter | Mildly toxic to pets |
| 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 |
| Quehl's Chin Cactus | Bright indirect light (just back from a sunny window) | When soil is completely dry, roughly every 10-14 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Quehlianum Chin Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in active growth; none in winter | Pet-safe |
| Rabiea albinota | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in active growth; keep nearly dry in winter | Mildly toxic to pets |
| Rainbow Hedgehog Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Rainbow Pincushion | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Rat Tail Cactus | Bright indirect light (just back from a sunny window) | Every 1-2 weeks in spring/summer; sparingly in winter | Mildly toxic to pets |
| Rat Tail Cactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in spring and summer; reduce to every 3-4 weeks in winter | Pet-safe |
| Rebutia krainziana | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 10-14 days in summer; none in winter | Mildly toxic to pets |
| Rechinger's Rosularia | Direct sun (at least 4-6 hours) | Every 2–4 weeks in the growing season; very rarely in winter | Pet-safe |
| Red Dragon Fruit | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; monthly in winter | Pet-safe |
| Red Pagoda | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer | Toxic to pets |
| Red Torch Cleistocactus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Red Vygie | Direct sun (at least 4-6 hours) | Every 3–4 weeks established; more frequent in first season | Pet-safe |
| Red Vygie | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is fully dry, roughly every 7-14 days in spring-summer; monthly or less in winter | Pet-safe |
| Red-Fleshed Dragon Fruit | Bright indirect light (just back from a sunny window) | Water when the top 3-5 cm of soil is dry, roughly every 7-10 days in growth; reduce in winter | Pet-safe |
| Reinwardtii Haworthia | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Reko's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Revolute Tromotriche | Direct sun (at least 4-6 hours) | Every 3–4 weeks in the growing season; minimal to none in dormancy | Mildly toxic to pets |
| Rhinephyllum broomii | Direct sun (at least 4-6 hours) | Only once the soil is completely dry, roughly every 10-14 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Rhipsalidopsis gaertneri | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Rhipsalis 'Cashero' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days | Pet-safe |
| Ribbed Brain Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season; reduce to once a month or less in winter | Pet-safe |
| 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 |
| Rincon Thelocactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; rarely in winter. | Pet-safe |
| Ritchie's Monadenium | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Toxic to pets |
| Rock Liveforever | Direct sun (at least 4-6 hours) | Every 3–5 weeks in summer (near-dry dormancy), every 2–3 weeks in winter (active season) | Pet-safe |
| Roesl's Uncarina | Direct sun (at least 4-6 hours) | Every 10–14 days in active growth; none or minimal October–March | Mildly toxic to pets |
| Roller Jovibarba | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer; minimal in winter | Pet-safe |
| Rollers Houseleek | Direct sun (at least 4-6 hours) | Every 14-21 days in spring and summer; barely at all in winter | Pet-safe |
| Rolling Houseleek | Direct sun (at least 4-6 hours) | Low — extremely drought-tolerant | Mildly toxic to pets |
| Rood's Vanheerdea | Direct sun (at least 4-6 hours) | Every 14-21 days in autumn through spring; essentially none in summer | Mildly toxic to pets |
| Rose Pincushion Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2 weeks in spring and summer; little to none in winter | Pet-safe |
| Rose Pincushion Cactus | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Round-Leaf Peperomia | Medium indirect light (a couple of metres from a window) | Every 10–14 days (allow top 2–3 cm to dry) | Pet-safe |
| Round-leaf Rosularia | Direct sun (at least 4-6 hours) | Every 14–21 days during spring and summer; minimal in winter | Pet-safe |
| Royal Flush Split Rock | Direct sun (at least 4-6 hours) | Only during active growth: late summer through winter and into early spring; stop completely while leaves are splitting | Pet-safe |
| Ruby Glow Peperomia | Bright indirect light (just back from a sunny window) | Roughly every 7-10 days in spring and summer; much less in winter | Pet-safe |
| Ruby Necklace | Bright indirect light (just back from a sunny window) | Roughly every 1-3 weeks; let the soil dry out completely between waterings | Mildly toxic to pets |
| Ruedebusch's Schwantesia | Direct sun (at least 4-6 hours) | Every 10-14 days in the autumn-winter growing season; taper in spring; almost none from late spring through summer | Mildly toxic to pets |
| Rusch's Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during the active autumn-to-spring period; completely dry in summer | Pet-safe |
| Sabre-Leaved Hottentot Fig | Direct sun (at least 4-6 hours) | very low — water only when soil is dry | Mildly toxic to pets |
| Sally-My-Handsome | Direct sun (at least 4-6 hours) | Every 3–4 weeks in the growing season; minimal in winter | Mildly toxic to pets |
| Samaipatensis Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer; sparing in winter | Pet-safe |
| San Gabriel Mountains Liveforever | Bright indirect light (just back from a sunny window) | Every 2–3 weeks autumn through spring; none or minimal in summer | Pet-safe |
| San Pedro Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, every 7-10 days in summer; once every 3-5 weeks in winter | Toxic to pets |
| Sand Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Sand Rose | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry, roughly every 10–14 days in summer and every 3–4 weeks in winter | Mildly toxic to pets |
| Sansevieria Ehrenbergii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Ehrenbergii Samurai | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Eilensis | Bright indirect light (just back from a sunny window) | When the soil is bone dry, roughly every 3-4 weeks | Toxic to pets |
| Sansevieria Francisii | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 12-16 days in summer | Toxic to pets |
| Sansevieria Gracilis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Intermedia | Medium indirect light (a couple of metres from a window) | When the soil is completely dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Kirkii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Laurentii | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Sansevieria Masoniana Variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Moonshine | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks; less in winter | Toxic to pets |
| Sansevieria Parva | Medium indirect light (a couple of metres from a window) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days in summer | Toxic to pets |
| Sansevieria Patens | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Pearsonii | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks | Toxic to pets |
| Sansevieria Phillipsiae | Bright indirect light (just back from a sunny window) | When the soil is completely dry, about every 3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Powellii | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Robusta | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, about every 2-3 weeks in summer and monthly in winter | Toxic to pets |
| Sansevieria Singularis | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 2-3 weeks in summer and every 4-6 weeks in winter | Toxic to pets |
| Sansevieria Stuckyi | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Sansevieria Trifasciata Futura Robusta | Low light (north window or shaded room) | When the soil is fully dry, roughly every 2-4 weeks | Toxic to pets |
| Santa Barbara Island Liveforever | Direct sun (at least 4-6 hours) | Every 1–2 weeks in the cool season (October–March); none from June–September | Pet-safe |
| Santa Rita Prickly Pear | Direct sun (at least 4-6 hours) | Every 2-3 weeks in spring/summer; once every 4-6 weeks in autumn; once monthly or less in winter | Mildly toxic to pets |
| Santa Rita Prickly Pear | Direct sun (at least 4-6 hours) | Sparingly when soil is fully dry, about every 3-4 weeks in summer; nearly none in winter | Pet-safe |
| Saucer Plant | Bright indirect light (just back from a sunny window) | When the top 3-4 cm of soil is fully dry, roughly every 10-14 days in growth | Mildly toxic to pets |
| Scaped Bergeranthus | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Mildly toxic to pets |
| Scarlet Ball Cactus | Direct sun (at least 4-6 hours) | When the mix is dry, about every 10-14 days in growth; sparingly in winter | Pet-safe |
| Scarlet Ball Cactus | Bright indirect light (just back from a sunny window) | When the top 2 cm of soil is dry, every 7-10 days in spring and summer; every 3-5 weeks in autumn; very sparingly in winter | Pet-safe |
| Scarlet Cleistocactus | Bright indirect light (just back from a sunny window) | When the soil is dry, about every 7-10 days in summer; sparing in winter | Pet-safe |
| Schaefer's Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in autumn–spring growing season; once per month or less in summer | Toxic to pets |
| Schied's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Schlumbergera 'White Christmas' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, roughly every 7-10 days in growth | Pet-safe |
| Schlumbergera × buckleyi | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Schwantes' Living Stone | Direct sun (at least 4-6 hours) | Every 10-21 days during the active autumn-to-spring period; none in summer | Pet-safe |
| Schwantes' Living Stones | Direct sun (at least 4-6 hours) | Every 3–4 weeks in autumn; withhold in summer and winter | Pet-safe |
| Schwantesia pillansii | Direct sun (at least 4-6 hours) | Only when soil is completely dry, roughly every 12-16 days in growth; keep nearly dry when dormant | Mildly toxic to pets |
| Sea Lettuce | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in winter (active growth); monthly or less in summer (dormancy) | Pet-safe |
| Sea Urchin Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, roughly weekly to fortnightly in summer; keep nearly dry in winter | Pet-safe |
| Sea Urchin Copiapoa | Direct sun (at least 4-6 hours) | Every 14-21 days in summer; once a month or completely dry in winter | Pet-safe |
| Sedum 'Autumn Joy' | Direct sun (at least 4-6 hours) | When soil is dry several centimeters down, roughly every 10-14 days | Pet-safe |
| Sedum burrito | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in summer | Pet-safe |
| Sedum clavatum | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer | Pet-safe |
| Sedum dasyphyllum | Direct sun (at least 4-6 hours) | Every 1-2 weeks when soil is fully dry in growth; sparingly in winter | Pet-safe |
| Sedum hernandezii | Direct sun (at least 4-6 hours) | When the soil is fully dry, about every 10-14 days in summer, very sparingly in winter | Pet-safe |
| Sedum palmeri | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer, sparingly in winter | Pet-safe |
| Sedum spectabile 'Iceberg' | Direct sun (at least 4-6 hours) | When soil is dry a few centimeters down, about every 10-14 days | Pet-safe |
| Sedum telephium 'Purple Emperor' | Direct sun (at least 4-6 hours) | When soil is dry a few centimeters down, about every 10-14 days | Pet-safe |
| 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 |
| Sempervivum 'Commander Hay' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum 'Emerald Empress' | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 1-2 weeks in summer, far less if grown outdoors in the ground | Pet-safe |
| Sempervivum 'Killer' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; almost none in winter | Pet-safe |
| Sempervivum 'Oddity' | Direct sun (at least 4-6 hours) | When the soil is fully dry, sparingly; roughly every 2 weeks in summer and minimal in winter | Pet-safe |
| Sempervivum 'Pacific Blue Ice' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum 'Red Lion' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; almost none in winter | Pet-safe |
| Sempervivum 'Reinhard' | Direct sun (at least 4-6 hours) | Every 2-3 weeks when fully dry in growth; minimal in winter | Pet-safe |
| Sempervivum calcareum | Direct sun (at least 4-6 hours) | Every 2-3 weeks in growth, only when the soil is fully dry; little to none in winter | Pet-safe |
| Sempervivum heuffelii | Direct sun (at least 4-6 hours) | When the soil is fully dry, sparingly; roughly every 2 weeks in summer and very little in winter | Pet-safe |
| Sempervivum montanum | Direct sun (at least 4-6 hours) | Every 2-3 weeks when soil is fully dry in growth; keep nearly dry in winter | Pet-safe |
| Seven-Spined Discocactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, approximately every 10-14 days in the growing season; once a month or less in winter | Pet-safe |
| Shadow Adromischus | Medium indirect light (a couple of metres from a window) | Every 2–3 weeks in the active season; monthly in winter | Pet-safe |
| Shaggy Trichodiadema | Direct sun (at least 4-6 hours) | When soil is completely dry, approximately every 10-14 days during winter-spring growth period; very sparingly (once monthly) in summer dormancy | Pet-safe |
| Shand's Gibbaeum | Direct sun (at least 4-6 hours) | Every 2–4 weeks during active growth (autumn and spring); withheld in summer dormancy and reduced to once monthly or less in winter | Pet-safe |
| Sharp-petaled Schwantesia | Direct sun (at least 4-6 hours) | Every 10-14 days during autumn and winter growth; once a month in spring; none or minimal in summer | Mildly toxic to pets |
| Shining Bush Peperomia | Medium indirect light (a couple of metres from a window) | Every 5–7 days in the growing season; every 10–14 days in winter | Pet-safe |
| Short-stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 2–4 weeks in growing season; monthly or less in winter | Mildly toxic to pets |
| Short-Stemmed Monanthes | Bright indirect light (just back from a sunny window) | Every 10–14 days in active growth; less in hot summer months | Pet-safe |
| Showy Disocactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, approximately every 7-10 days in spring and summer; reduce to every 3-4 weeks in winter | Pet-safe |
| Shrubby Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer through early spring; completely dry in June–August | Pet-safe |
| Silver Ball Cactus | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, every 10-14 days in summer; every 4-6 weeks in autumn; once monthly or less in winter | Pet-safe |
| Silver Ball Notocactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, approximately every 10-14 days in summer; sparingly once every 4-6 weeks in winter | Pet-safe |
| Silver Cluster Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, about every 10-14 days in growth; withhold in winter | Pet-safe |
| Silver Crown | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer (growing season); every 3–4 weeks in autumn–winter | Toxic to pets |
| Silver Torch Cactus | Direct sun (at least 4-6 hours) | When the soil is dry, about every 10-14 days in summer; keep dry in winter | Pet-safe |
| Silver Waves Cotyledon | Bright indirect light (just back from a sunny window) | When the soil is almost dry, roughly every 10-14 days in summer | Toxic to pets |
| Simpson's Juttadinteria | Direct sun (at least 4-6 hours) | Every 2–3 days in the active season (autumn and spring); very sparingly in summer | Mildly toxic to pets |
| Singapore Yellow Frangipani | Direct sun (at least 4-6 hours) | Weekly to fortnightly during active growth; very sparingly in winter dormancy | Toxic to pets |
| Slender Frailea | Bright indirect light (just back from a sunny window) | When the top 3 cm of soil is dry, roughly every 10-14 days in summer | Pet-safe |
| Slender Iceplant | Direct sun (at least 4-6 hours) | Sparingly; allow soil to dry completely between waterings | Pet-safe |
| Slender-lined Living Stones | Direct sun (at least 4-6 hours) | Very infrequent — one or two waterings during the autumn growth window (September–November); completely dry for 7–8 months of the year | Pet-safe |
| Smelly Dorstenia | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 3–4 weeks in winter | Mildly toxic to pets |
| Smooth Cane Begonia | Bright indirect light (just back from a sunny window) | When the top 2 cm of compost feel dry | Toxic to pets |
| 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 |
| Sneed's Pincushion | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 14-21 days in the growing season; almost none in winter | Pet-safe |
| Snowball Pincushion | Direct sun (at least 4-6 hours) | When fully dry, about every 10-14 days in summer; keep dry through winter | Pet-safe |
| Snowcap Cactus | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in summer; keep dry in winter | Pet-safe |
| Soft-leaf Dunce Cap | Bright indirect light (just back from a sunny window) | Approximately every 12–14 days in the growing season; very sparingly in winter dormancy | Pet-safe |
| Somali Desert Rose | Direct sun (at least 4-6 hours) | Weekly in hot active growth (above 30°C/86°F); cease or minimise in winter | Toxic to pets |
| Spanish Houseleek | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month in winter | Pet-safe |
| Spanish Stonecrop | Direct sun (at least 4-6 hours) | Low — drought-tolerant; water only in very dry spells | Pet-safe |
| Spear Head | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–5 weeks in autumn and winter | Toxic to pets |
| Spegazzini's Gymnocalycium | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, every 10-14 days in summer; every 4-6 weeks in winter | Pet-safe |
| Spilanthes | Direct sun (at least 4-6 hours) | When the top 2 cm of soil is dry, roughly every 2-3 days in summer | Mildly toxic to pets |
| Spiny Adenia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; completely dry in winter | Toxic to pets |
| Spiny Club Cactus | Direct sun (at least 4-6 hours) | When soil is dry, about every 10-14 days in summer; little to none in winter | Pet-safe |
| Spiny Orostachys | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; almost none in winter dormancy | Pet-safe |
| Spiny Ruschia | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days in summer; once every 4-6 weeks in winter | Pet-safe |
| Spinystar Cactus | Direct sun (at least 4-6 hours) | When the potting mix is completely dry, roughly every 10-14 days in summer; almost none from October to March | Pet-safe |
| Split Rock | Direct sun (at least 4-6 hours) | Soak-and-dry, only when fully dry — roughly every 2-3 weeks in active growth; little to none in summer and winter | Pet-safe |
| Spoon-leaved Aloinopsis | Direct sun (at least 4-6 hours) | Every 2–3 weeks from autumn through early spring; minimal or none June–August | Pet-safe |
| Spotted Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; once monthly or less in winter | Mildly toxic to pets |
| Spotted Gasteria | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Pet-safe |
| Stapelia flavopurpurea | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Pet-safe |
| Stapelia grandiflora | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia hirsuta | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia hirsuta var. vetula | Bright indirect light (just back from a sunny window) | When the soil has dried out, roughly every 1-2 weeks in warm growth | Mildly toxic to pets |
| Stapelia leendertziae | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in the growing season | Pet-safe |
| Stapelia variegata | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in spring and summer | Pet-safe |
| Stapelia-Like Monadenium | Bright indirect light (just back from a sunny window) | When the soil is mostly dry, roughly every 10-14 days in summer and every 4 weeks in winter | Toxic to pets |
| Star Cactus | Direct sun (at least 4-6 hours) | Every 2-4 weeks in spring/summer; roughly monthly or less in winter | Pet-safe |
| Star Frailea | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is completely dry, roughly every 10-14 days in summer | Pet-safe |
| Star-fruited Uncarina | Direct sun (at least 4-6 hours) | Every 10–14 days in growing season; completely dry during winter dormancy | Mildly toxic to pets |
| Stardust Ice Plant | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is dry, roughly every 7–14 days in summer; reduce in autumn and maintain nearly dry in winter | Mildly toxic to pets |
| Starfish Sansevieria | Medium indirect light (a couple of metres from a window) | When the soil is fully dry, roughly every 2-3 weeks (longer in winter) | Toxic to pets |
| Stonecrop 'Autumn Joy' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is fully dry, roughly every 10-14 days; less frequent once established | Pet-safe |
| Stonecrop 'Dragon's Blood' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days; minimal once established | Pet-safe |
| Stonecrop Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; once a month or less in winter | Pet-safe |
| Stonecrop-leaf Aichryson | Bright indirect light (just back from a sunny window) | Every 10–14 days in the active growing season (autumn to spring); once a month or less in summer | Pet-safe |
| straight-leaved butterwort | Bright indirect light (just back from a sunny window) | Water when top of mix feels barely dry (summer); reduce to very occasional misting (winter) | Pet-safe |
| Strawberry Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer; once a month or less in winter | Pet-safe |
| 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 bananas | Bright indirect light (just back from a sunny window) | When soil is dry, every 14 days | Toxic to pets |
| String of dolphins | Bright indirect light (just back from a sunny window) | When soil is dry, every 10-14 days | Toxic to pets |
| String of Fishhooks | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| String of hearts | Bright indirect light (just back from a sunny window) | When soil is dry, every 10-14 days | Pet-safe |
| String of Hearts 'Silver Glory' | Bright indirect light (just back from a sunny window) | When the top half of the soil is fully dry, roughly every 10-14 days in growth | Pet-safe |
| String of needles | Bright indirect light (just back from a sunny window) | When soil is dry, every 10-14 days | Mildly toxic to pets |
| String of Needles | Bright indirect light (just back from a sunny window) | When the top 3-5 cm of soil is dry, roughly every 10-14 days in summer and every 3-4 weeks in winter | Mildly toxic to pets |
| String of pearls | Direct sun (at least 4-6 hours) | When the soil is completely dry, every 2-3 weeks | Toxic to pets |
| String of Pearls | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; every 4–6 weeks in autumn and winter | Toxic to pets |
| String of pickles | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks | Mildly toxic to pets |
| String of Raindrops | Bright indirect light (just back from a sunny window) | When the compost is dry right through, roughly every 10-14 days in summer and every 3-4 weeks in winter | Toxic to pets |
| String of Teardrops | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); once a month or less in summer dormancy | Toxic to pets |
| String of Tears | Bright indirect light (just back from a sunny window) | Roughly every 7-14 days in spring and summer; about once a month in winter. | Toxic to pets |
| String of Tears | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| String of Watermelons | Bright indirect light (just back from a sunny window) | Every 10–14 days in spring and summer; once a month or less in winter | Toxic to pets |
| Striped Nananthus | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; minimal in summer | Mildly toxic to pets |
| Striped Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in winter (growing season); suspend almost entirely in summer | Toxic to pets |
| Summer Impala Lily | Direct sun (at least 4-6 hours) | Every 7–14 days in active growth; sparingly or not at all in winter dormancy | Toxic to pets |
| Sun Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in the growing season; nearly dry in winter | Pet-safe |
| Sunrise Crown Cactus | Direct sun (at least 4-6 hours) | When fully dry, roughly every 12-16 days in growth; none in winter | Pet-safe |
| Sunrise Succulent | Bright indirect light (just back from a sunny window) | When the top 2–3 cm of soil is dry, roughly every 10–14 days in summer and every 3–5 weeks in winter | Mildly toxic to pets |
| Sutherland's Ice Plant | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is completely dry, roughly every 7-14 days in growing season; reduce to monthly in winter | Pet-safe |
| Sweetheart plant | Bright indirect light (just back from a sunny window) | When soil is dry, every 14-21 days | Pet-safe |
| Swollen-stem Tylecodon | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in the growing season (autumn–spring); once monthly or none in summer | Toxic to pets |
| Tasteless Stonecrop | Bright indirect light (just back from a sunny window) | Every 14-21 days in spring and summer; monthly or less in winter | Pet-safe |
| Tavaresia barklyi | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in warm growth; keep nearly dry in winter | Mildly toxic to pets |
| Tavaresia grandiflora | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in warm growth; keep nearly dry in winter | Mildly toxic to pets |
| Tawny Living Stones | Direct sun (at least 4-6 hours) | Seasonally — water sparingly in autumn (September–November) during active growth; keep completely dry in winter and summer | Pet-safe |
| Teddy Bear Vine | Bright indirect light (just back from a sunny window) | When the top half of the soil has dried out, roughly every 10-14 days | Mildly toxic to pets |
| Tephrocactus | Direct sun (at least 4-6 hours) | When the mix is completely dry, sparingly every 2-3 weeks in summer; keep bone-dry in winter | Mildly toxic to pets |
| Texas Barrel Cactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Texas Nipple Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-14 days in summer and once every 4-6 weeks in winter | Pet-safe |
| Theresa's Pincushion | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and once every 6-8 weeks in winter | Pet-safe |
| Thick-stemmed Aichryson | Bright indirect light (just back from a sunny window) | Every 10–15 days during active growth (spring–summer); very sparingly in winter | Mildly toxic to pets |
| Thimble Cactus | Direct sun (at least 4-6 hours) | When fully dry, roughly every 10-14 days in summer; keep nearly dry in winter | Pet-safe |
| Thorny Adenia | Direct sun (at least 4-6 hours) | Every 2–4 weeks in summer growing season; none in winter dormancy | Toxic to pets |
| Tiger Aloe | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 2-3 weeks in active growth, sparingly in summer dormancy and winter | Toxic to pets |
| Tiger Jaws | Bright indirect light (just back from a sunny window) | Every 2-3 weeks in spring-autumn; roughly monthly or less in winter | Mildly toxic to pets |
| Tina butterwort | Bright indirect light (just back from a sunny window) | Keep media lightly damp during carnivorous phase; allow to nearly dry during succulent winter phase | Pet-safe |
| Tiny Sun Mammillaria | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 10-14 days in summer and once every 6 weeks in winter | Pet-safe |
| Tiraque Sulcorebutia | Direct sun (at least 4-6 hours) | Every 10-14 days in active growth; once a month or less from October to February | Pet-safe |
| Titanopsis Hugo-Schlechteri | Direct sun (at least 4-6 hours) | Mainly in autumn through spring, every 2-3 weeks when the soil is fully dry; sparing in hot summer | Mildly toxic to pets |
| Titanopsis primosii | Direct sun (at least 4-6 hours) | In autumn-spring growth once soil is fully dry; withhold through summer dormancy | Mildly toxic to pets |
| Titanopsis schwantesii | Direct sun (at least 4-6 hours) | During autumn-spring growth when soil is fully dry; near-zero in summer | Mildly toxic to pets |
| Tom Thumb Cactus | Direct sun (at least 4-6 hours) | When the top of the soil is dry, about every 7-10 days in summer; minimal in winter | Pet-safe |
| Tongue Leaf Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn and spring; very sparingly in summer and winter | Mildly toxic to pets |
| Top-shaped Living Stones | Direct sun (at least 4-6 hours) | Every 3–4 weeks in autumn; none in summer or winter | Pet-safe |
| Torch Aloe | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 2-3 weeks in growth | Toxic to pets |
| Totem Pole Cactus | Direct sun (at least 4-6 hours) | When the mix is fully dry, roughly every 2-3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Tradescantia 'Bubblegum' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Tradescantia 'Lilac' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Tradescantia fluminensis 'Tricolor' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Tradescantia fluminensis 'Variegata' | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 5-7 days in growth | Toxic to pets |
| Tradescantia Navicularis | Bright indirect light (just back from a sunny window) | When the top half of the pot is dry, roughly every 10-14 days | Toxic to pets |
| Trailing Elephant Bush | Bright indirect light (just back from a sunny window) | Every 7–10 days in summer; every 2–3 weeks in winter | Pet-safe |
| Trailing Ice Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks (allow soil to dry completely between waterings) | Pet-safe |
| Trailing Iceplant Vygie | Direct sun (at least 4-6 hours) | When the top 3 cm of soil is fully dry, roughly every 7-10 days in spring-summer; monthly or less in winter | Pet-safe |
| Tree Houseleek | Direct sun (at least 4-6 hours) | Every 1-2 weeks in active growth (autumn-spring); roughly every 3 weeks or less during summer dormancy | Mildly toxic to pets |
| Tree-Like Pilosocereus | Direct sun (at least 4-6 hours) | When soil is dry to mid-depth, roughly every 10-14 days in summer; monthly in winter | Pet-safe |
| Triangular Rhipsalis | 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 |
| Truncate Haworthia | Bright indirect light (just back from a sunny window) | When soil is fully dry, about every 10-14 days in active growth, minimal in winter | Pet-safe |
| Tuberous Begonia | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of compost is dry, roughly every 3-5 days in summer | Toxic to pets |
| Tulista Marginata | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, about every 2-3 weeks in growth; monthly in winter | Pet-safe |
| Tulista Pumila | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 2-3 weeks in growth; monthly in winter | Pet-safe |
| Turbinicarpus pseudomacrochele | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2 weeks; none in winter | Pet-safe |
| Turbinicarpus schmiedickeanus | Direct sun (at least 4-6 hours) | Sparingly when fully dry in summer, roughly every 2-3 weeks; none in winter | Pet-safe |
| Turbinicarpus valdezianus | Direct sun (at least 4-6 hours) | Very sparingly when fully dry in the growing season, roughly every 2-3 weeks; none in winter | Pet-safe |
| Turk's Head Barrel | Direct sun (at least 4-6 hours) | When soil is completely dry, approximately every 10-14 days in the growing season; every 4-6 weeks in winter | Pet-safe |
| Turkish Rosularia | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season; very sparingly in winter | Pet-safe |
| Twin-flowered Ruschia | Direct sun (at least 4-6 hours) | When soil is fully dry, roughly every 10-14 days in the growing season; very sparingly (once every 3-4 weeks) in winter | Pet-safe |
| Twisted Aichryson | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in spring and summer; monthly in winter | Mildly toxic to pets |
| Twisted Barrel Cactus | Direct sun (at least 4-6 hours) | When fully dry, about every 2-3 weeks in summer; keep dry in winter | Mildly toxic to pets |
| Two-Petal Begonia | Medium indirect light (a couple of metres from a window) | Every 7–10 days; less in cooler months | Toxic to pets |
| Two-Row Stonecrop | Direct sun (at least 4-6 hours) | Every 10-14 days until established; essentially rain-fed once rooted | Pet-safe |
| Unarmed Hedgehog Cactus | Direct sun (at least 4-6 hours) | When soil is completely dry, every 10-14 days in summer; once a month or less in winter | Pet-safe |
| Valdez's Aztec Cactus | Bright indirect light (just back from a sunny window) | When the mix is nearly dry, roughly every 14-28 days in the growing season; once every 4-6 weeks in winter | Pet-safe |
| Vanilla Orchid | Bright indirect light (just back from a sunny window) | Water when the top 2-3 cm of medium is dry, roughly every 5-7 days in summer; every 10-14 days in winter | Pet-safe |
| Variegated Bear's Paw | Bright indirect light (just back from a sunny window) | Every 3–4 weeks, or when soil is completely dry | Toxic to pets |
| Variegated Carrion Flower | Bright indirect light (just back from a sunny window) | Every 14–21 days in summer; very sparingly (once monthly or less) in winter | Pet-safe |
| Variegated Elephant Bush | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 1-2 weeks in summer, monthly in winter | Pet-safe |
| Variegated Elephant Bush | Bright indirect light (just back from a sunny window) | When the top 3–4 cm of soil is dry, roughly every 10–14 days in summer and every 3–4 weeks in winter | Pet-safe |
| Variegated Liveforever | Bright indirect light (just back from a sunny window) | Every 10–14 days from late autumn through spring when leaves are present; withhold completely in summer dormancy | Pet-safe |
| Variegated Moon Cactus | Bright indirect light (just back from a sunny window) | When the soil is fully dry, roughly every 10-14 days in growth; minimal in winter | Pet-safe |
| Variegated String of Pearls | Bright indirect light (just back from a sunny window) | When soil is fully dry, roughly every 10-14 days in growth | Toxic to pets |
| Variegated Sweetheart Hoya | Bright indirect light (just back from a sunny window) | When the mix is almost fully dry, every 2-3 weeks | Pet-safe |
| Veined Begonia (Venosa) | Bright indirect light (just back from a sunny window) | When the top half of the soil is dry; sparingly in winter (roughly monthly) | Toxic to pets |
| Velvet Cotyledon | Bright indirect light (just back from a sunny window) | Every 10–14 days in the growing season, every 3–4 weeks in winter | Toxic to pets |
| Verity's Liveforever | Direct sun (at least 4-6 hours) | Every 10–14 days in the cool growing season (October–April); completely dry June–September | Pet-safe |
| Veronica beccabunga | Direct sun (at least 4-6 hours) | Keep permanently wet; never let the rootzone dry out | Mildly toxic to pets |
| Villete's Living Stones | Direct sun (at least 4-6 hours) | Every 3–5 weeks in autumn; none in summer or winter | Pet-safe |
| Wall Monanthes | Medium indirect light (a couple of metres from a window) | Every 1–2 weeks in the growing season; every 3–4 weeks in winter | Pet-safe |
| Warty Living Stone | Direct sun (at least 4-6 hours) | Every 14-21 days during active autumn-to-spring growth; completely none in summer | Pet-safe |
| Warty Living Stones | Direct sun (at least 4-6 hours) | Every 3–5 weeks in autumn; none in summer or deep winter | Pet-safe |
| 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 Lily Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in spring and summer; every 3-4 weeks in autumn; almost none in winter | Pet-safe |
| 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 |
| Whale Fin Snake Plant | Bright indirect light (just back from a sunny window) | every 2-4 weeks, when soil is fully dry | Toxic to pets |
| White Anacampseros | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in summer and monthly or less in winter | Mildly toxic to pets |
| White Juttadinteria | Direct sun (at least 4-6 hours) | Every 2–3 weeks in the growing season (spring through autumn); very sparingly in winter | Mildly toxic to pets |
| White Tiger Jaws | Direct sun (at least 4-6 hours) | Every 14–21 days during the growing season (spring–autumn); once monthly or less in winter | Mildly toxic to pets |
| White-Flowered Crown Cactus | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once a month or less from October to February | Pet-safe |
| White-pink Stomatium | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; every 4-6 weeks or less in winter | Mildly toxic to pets |
| White-Spined Thelocactus | Direct sun (at least 4-6 hours) | When the soil is completely dry, roughly every 14-21 days in the growing season; suspend almost entirely in winter. | Pet-safe |
| Wide Eye Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn to late winter; none in summer | Pet-safe |
| Wild's Pincushion | Direct sun (at least 4-6 hours) | Every 10-14 days in summer; once every 3-4 weeks in winter | Pet-safe |
| Wilman's Ebracteola | Direct sun (at least 4-6 hours) | When soil is completely dry, roughly every 10-14 days during the spring-autumn growing season; very sparingly (once every 4-6 weeks) in winter | Pet-safe |
| Wilmot's Dinteranthus | Direct sun (at least 4-6 hours) | Autumn only (2 watering cycles); stop completely in spring while new leaves emerge; minimal in early winter | Pet-safe |
| Wilmot's Dinteranthus | Direct sun (at least 4-6 hours) | Every 3–5 weeks during autumn through early spring; completely dry June–August | Pet-safe |
| Window Plant | Direct sun (at least 4-6 hours) | Every 3–4 weeks in spring and summer; minimal in winter | Pet-safe |
| Wire-stem Tylecodon | Direct sun (at least 4-6 hours) | Every 10–14 days in the growing season (autumn–spring); once per month or less in summer dormancy | Toxic to pets |
| Witteberg Cone Plant | Bright indirect light (just back from a sunny window) | Every 2–3 weeks in autumn–winter; almost none in summer | Pet-safe |
| Woolly Weingartia | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in the growing season; once monthly or less in winter. | Pet-safe |
| Woven Matucana | Direct sun (at least 4-6 hours) | When the top 3-4 cm of soil is dry, every 10-14 days in summer | Pet-safe |
| Wrinkled Elatostema | Low light (north window or shaded room) | Every 3–5 days; soil should remain consistently moist | Pet-safe |
| Yellow Baby Toes | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active growth (autumn through spring); essentially none through summer dormancy | Pet-safe |
| Yellow Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks in autumn; withhold entirely in summer | Pet-safe |
| Yellow Cone Plant | Direct sun (at least 4-6 hours) | Every 2–3 weeks from late summer through early spring; fully dry throughout June–August | Pet-safe |
| Yellow Dragon Fruit | Direct sun (at least 4-6 hours) | Every 10-14 days in growth; let the top half of the mix dry first | Pet-safe |
| Yellow Dragon Fruit | Direct sun (at least 4-6 hours) | When the soil is fully dry, roughly every 10-14 days in summer; every 3-4 weeks in winter | Pet-safe |
| Yellow Pitaya | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days in summer; every 2-4 weeks in winter | Pet-safe |
| Yellow Tower Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, every 7-14 days in spring and summer; every 4-6 weeks in autumn; once monthly or less in winter | Pet-safe |
| Yellow-scaled Tylecodon | Direct sun (at least 4-6 hours) | Every 2–3 weeks during active winter growth; completely dry during summer dormancy | Toxic to pets |
| Yucca | Direct sun (at least 4-6 hours) | When the soil is mostly dry, every 10-14 days | 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 |
| Zehtner's Turk's Cap | Direct sun (at least 4-6 hours) | When the top 2-3 cm of soil is dry, roughly every 7-10 days in summer; reduce to once every 3-4 weeks in winter | Pet-safe |