How to plant
When to plant
Plant Agapanthus in spring after the threat of frost has passed and the soil begins to warm. In mild climates, planting in late winter may also work, provided the soil doesn’t remain soggy or frozen.
Where to plant
Select a location with full sun to part shade. Agapanthus prefer bright light for strong flowering but benefit from afternoon shade in very hot regions. They need soil that drains well—standing water causes root problems.
Preparing the soil
Loosen soil to a depth of about 25 cm, remove rocks and debris, and improve poor soil by mixing in compost or organic matter. In heavy or clay soils, add grit or coarse sand to aid drainage and air circulation.
Planting the rhizomes
Position each rhizome horizontally or slightly angled, with any growth points facing upward. Cover with soil so that the rhizome lies about 5–10 cm beneath the surface, depending on species. Space plantings about 30 cm apart to allow mature clumps to spread.
After planting
Water well to settle soil around the planting site. After initial watering, maintain consistent moisture while growth is active, but avoid waterlogging. Once established, Agapanthus tolerate some drought, though flowering improves with regular moisture.
During growth & blooming
Leaves and stems emerge, followed by striking umbels of flowers. Feed with a balanced fertilizer early in the season to support flower development. Deadhead individual stalks when blooms fade to keep the plant tidy and encourage new stalks.
After blooming / end of season
Allow foliage to persist and die back naturally, as it helps the rhizome store energy. After leaves yellow, trim them off. In colder regions, provide frost protection or lift rhizomes and store them in a dry, frost-free place over winter. In frost-free gardens, they may remain in place with a mulch layer for insulation.
Extra tips
- In containers, use deep pots with good drainage to accommodate root spread.
- Rotate plants occasionally to avoid permanent shading and to promote even growth.
- If clumps become overcrowded and flowering declines, divide during spring or early summer and replant.
- Avoid high-nitrogen feeding which encourages foliage at the expense of flowers.
- Use Agapanthus as a focal or accent plant — their height and spherical flower heads pair beautifully with lower perennials or grasses.
