African lily
Also known as
Lily of the Nile, Common agapanthus, Blue lily
Keep this plant’s care guide close at hand.
Get the appAbout African lily
Agapanthus praecox is an evergreen to semi-evergreen perennial native to South Africa, prized for its bold clumps of strap-like leaves and showy, spherical umbels of funnel-shaped blue to white flowers in summer. Thick, fleshy roots and short rhizomes store moisture, making the plant drought-tolerant once established and well-suited to coastal gardens. Stems rise above the foliage to carry long-lasting blooms that attract bees and other pollinators, and are excellent for cut flowers. It thrives in well-drained soils and responds best to full sun in temperate climates, with light afternoon shade in hot inland areas. In mild regions it forms large, long-lived clumps; in colder zones it is often grown in containers and overwintered frost-free. The species is widely used as a low-maintenance border, mass planting, or container subject. In some regions it can self-seed and spread; prompt deadheading helps limit unwanted seedlings and conserves the plant’s energy for robust growth and repeat flowering.
Taxonomy
Properties & Requirements
How to care for African lily
Water
Water deeply and infrequently to encourage deep rooting. In active growth and bloom, give a thorough soak when the top 2–3 cm of soil are dry—typically weekly in the ground, more often in hot, windy weather. For containers, ensure excellent drainage and empty saucers. Reduce watering markedly in winter, keeping the root zone just barely moist. Avoid waterlogging, which leads to crown and root rot.
Light
Provide full sun for best flowering—aim for 6–8 hours of direct light daily. In very hot or inland climates, light afternoon shade prevents leaf scorch and prolongs bloom. Plants will tolerate bright, open shade but may flower sparsely. Indoors, place near a south or west window with unobstructed light, supplementing with grow lights if needed.
Nutrients
Feed in spring as growth starts with a balanced, slow-release fertilizer skewed slightly to phosphorus and potassium (e.g., 5-10-10) to promote flowering. Container plants benefit from a half-strength liquid feed every 3–4 weeks through bloom. Avoid heavy nitrogen, which pushes foliage at the expense of flowers. Stop feeding in late summer to harden growth before winter. Flush pots occasionally to prevent salt buildup.
Temperature
Agapanthus praecox grows best between 10–25°C. It tolerates brief light frosts to about −2°C, with mulch offering extra protection; harder freezes can damage foliage and crowns. In USDA Zones 8b–11 it can be grown outdoors year-round; elsewhere, overwinter containers in a bright, frost-free spot above 5°C. Avoid rapid freeze–thaw cycles and cold, waterlogged soils during dormancy.
