How to plant
When to plant
Plant crocosmia rhizomes in spring after danger of frost has passed and the soil has warmed. In milder regions, you may start them earlier indoors and transplant later.
Where to plant
Select a spot with full sun or light shade. Bright light strengthens stems and encourages strong bloom. The soil must drain well—crocosmia dislikes standing water or overly saturated earth.
Preparing the soil
Loosen the bed to a depth of approximately 20–25 cm, clear out stones and debris, and blend in compost or organic matter. In heavier soils, incorporate coarse sand or grit to improve structure and reduce water retention.
Planting the rhizomes
Lay each rhizome horizontally, with the “eyes” or growing tips facing upward. Cover with soil so it is about 5–8 cm deep. Space plantings 20–30 cm apart to allow room for the clumps to expand.
After planting
Water thoroughly to settle soil around the rhizomes. Keep the ground evenly moist during the growing season, especially during dry spells. Avoid having soggy soil when plants are dormant.
During growth & blooming
New shoots will emerge, followed by arching stems of blooms. Feed with a balanced fertilizer early in the season to support stem strength and flowering. Deadhead faded flowers to maintain appearance and redirect energy into rhizomes.
After blooming / end of season
Allow the foliage to yellow and die back naturally — this recharges the rhizomes. In colder climates, once the foliage has fully withered, lift the rhizomes, clean and dry them, and store in a cool, frost-free place until spring. In milder zones, they may stay in place with light mulch protection.
Extra tips
Support taller varieties if stems lean in wind. In containers, use deep pots with excellent drainage. Divide crowded clumps during dormancy to maintain vigor. Crocosmia combines beautifully with grasses and summery perennials for contrast and rhythm.
