| Abelia chinensis | Direct sun (at least 4-6 hours) | Weekly through the first season, then mainly during dry spells | Mildly toxic to pets |
| Abelia x grandiflora | Direct sun (at least 4-6 hours) | Weekly deep soak in the first season, then only during prolonged dry spells once established | Mildly toxic to pets |
| Acorus gramineus | Bright indirect light (just back from a sunny window) | Keep soil constantly moist to wet; never allow to dry out | Mildly toxic to pets |
| Acorus gramineus 'Variegatus' | Bright indirect light (just back from a sunny window) | Keep soil constantly moist to wet at all times | Mildly toxic to pets |
| Actinidia kolomikta | Direct sun (at least 4-6 hours) | Keep soil evenly moist, watering deeply about weekly in dry summer spells | Mildly toxic to pets |
| Aerangis biloba | Bright indirect light (just back from a sunny window) | Every 1-3 days when mounted; every 3-5 days in a small basket, kept lightly moist | Pet-safe |
| Aerangis fastuosa | Medium indirect light (a couple of metres from a window) | Water every 1-3 days, keeping the roots consistently moist | Pet-safe |
| Aesculifolia Rodgersia | Medium indirect light (a couple of metres from a window) | Keep soil consistently moist; water deeply 1-2 times weekly, more in heat | Mildly toxic to pets |
| African Marigold 'Crackerjack' | Direct sun (at least 4-6 hours) | When top 3-4 cm of soil is dry, about every 4-7 days | Mildly toxic to pets |
| African Wormwood | Direct sun (at least 4-6 hours) | Every 2–3 weeks once established; weekly for container specimens | Mildly toxic to pets |
| Agastache 'Blue Fortune' | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is dry, roughly every 7-10 days | Pet-safe |
| Agave Cactus | Direct sun (at least 4-6 hours) | When the top 3-5 cm of soil is completely dry, roughly every 10-14 days in summer; very sparingly in winter | Pet-safe |
| Agnes Rose | Direct sun (at least 4-6 hours) | Deep watering once a week, more in drought or first season | Pet-safe |
| Agrimony | Direct sun (at least 4-6 hours) | Water to establish, then only in prolonged drought, roughly every 10-14 days | Mildly toxic to pets |
| Alcantarea odorata | Bright indirect light (just back from a sunny window) | Keep the central tank filled; water the mix when its top 4-5 cm is dry | Pet-safe |
| Alexandria Alpine Strawberry | Direct sun (at least 4-6 hours) | Keep evenly moist; water 2-3 times a week in warm weather | Pet-safe |
| All Gold Lemon Balm | Medium indirect light (a couple of metres from a window) | Every 3–5 days; when top inch of soil feels dry | Pet-safe |
| Allegheny serviceberry | Bright indirect light (just back from a sunny window) | Weekly during establishment; moderate once established | Pet-safe |
| Allegheny Spurge | Low light (north window or shaded room) | Weekly during the first 1–2 growing seasons; every 2–3 weeks once established | Mildly toxic to pets |
| Allium 'Gladiator' | Direct sun (at least 4-6 hours) | Water during spring growth; keep dry in summer dormancy, every 2-3 weeks at most if drought-stressed | Toxic to pets |
| Alocasia Odora | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of mix is dry, about every 4-7 days in growth | Toxic to pets |
| Alpine Rock Cress | Direct sun (at least 4-6 hours) | Weekly during establishment; every 2–3 weeks once established | Pet-safe |
| Amanus Oregano | Direct sun (at least 4-6 hours) | Every 10–14 days in summer; monthly in winter | Pet-safe |
| Amazon Moonflower Cactus | Bright indirect light (just back from a sunny window) | When the top 2-3 cm of substrate is dry, roughly every 7-10 days in the growing season; every 2-3 weeks in a cooler rest period | Pet-safe |