Agapanthus africanus 'Albus' (white African lily) care

Light

Most houseplants will scorch where agapanthus africanus 'albus' thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Demands full sun for good flowering and sturdy stems; at least 6 hours of direct light. In Britain the warmest, most sheltered position or a glasshouse gives the best results. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for water regularly, roughly twice weekly in hot weather while growing; keep just moist in winter for agapanthus africanus 'albus', but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Keep the rootball evenly moist through spring and summer growth. As an evergreen it never goes fully dormant, so do not let it dry out completely in winter, but water sparingly to avoid cold-wet rot.

Soil and pot

Agapanthus africanus 'Albus' grows best in free-draining, fertile loam-based mix. Wants a rich, sharply drained medium; in containers use John Innes No. 3 with added grit. Good drainage is critical because the evergreen crown is vulnerable to rot in cold, wet conditions. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Agapanthus africanus 'Albus' sits happiest at around Moderate, 40-60% humidity and 10-25°C (50-77°F). Tolerates ordinary outdoor and glasshouse humidity. Under glass over winter, ensure ventilation so the evergreen foliage stays dry and free of grey mould. If you keep the room above 10 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed agapanthus africanus 'albus' sparingly. Feed every 2 weeks from spring to flowering with a high-potash liquid feed such as tomato fertiliser to maximise the white blooms; reduce in late summer and stop over winter. Skip high-nitrogen feeds, which suppress flowering. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on agapanthus africanus 'albus' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Frost damage — This evergreen species is the most tender agapanthus; foliage and crowns are killed by hard frost. Overwinter pots in a frost-free greenhouse or porch in cool climates.
• Poor flowering — Caused by shade, over-potting, or too much nitrogen. Provide full sun, keep roots slightly restricted, and feed with high-potash fertiliser.
• Crown and root rot — Cold, waterlogged compost rots the evergreen crown. Use a gritty, free-draining mix and water sparingly in winter while keeping the plant from drying out fully.
• Grey mould on overwintered foliage — Stale, damp glasshouse air causes botrytis on retained leaves. Ventilate well, remove dead foliage, and avoid wetting the leaves.

Propagation

Divide clumps in spring as growth restarts, retaining several growth points per piece; flowering may pause briefly afterwards. 'Albus' is propagated by division only, as seed will not reliably reproduce the white-flowered form. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Agapanthus africanus 'Albus' is mildly toxic to pets. Agapanthus africanus is not individually listed in the ASPCA Toxic/Non-Toxic Plants database and is not a true lily, so it poses no lily-type kidney risk. The sap and rhizome contain saponins that can cause drooling, mouth irritation and vomiting if chewed. Treat with caution and verify with a vet if a pet ingests it. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Agapanthus africanus 'Albus' deep-dive guides

Every aspect of agapanthus africanus 'albus' care, each with its own calibrated guide:

• Agapanthus africanus 'Albus' watering schedule
• Agapanthus africanus 'Albus' light requirements
• Best soil mix for agapanthus africanus 'albus'
• Agapanthus africanus 'Albus' fertilizing guide
• When to repot agapanthus africanus 'albus'
• How to propagate agapanthus africanus 'albus'
• Agapanthus africanus 'Albus' growth rate & size
• Agapanthus africanus 'Albus' cold hardiness
• Agapanthus africanus 'Albus' temperature & humidity
• Is agapanthus africanus 'albus' toxic to cats & dogs?
• Is agapanthus africanus 'albus' toxic to cats?
• Is agapanthus africanus 'albus' toxic to dogs?
• Getting agapanthus africanus 'albus' to bloom

Featured in these plant shortlists

Agapanthus africanus 'Albus' qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Agapanthus africanus 'Albus' is also commonly called white African lily or white agapanthus.

• Peace lily care — light, water and common problems
• Bird of paradise care — light, water and common problems
• Hoya care — light, water and common problems
• All 5561 plant care guides in the Growli library