Crocosmia plant profile
Crocosmia x crocosmiiflora
A perennial flower for full sun.
Last updated .
When to plant
When to plant Crocosmia
Plant crocosmia corms in spring once the danger of frost has passed, at the same time you would plant dahlias or begonias (Washington State University). In its hardy zones crocosmia stays in the ground; lift and divide congested clumps in spring just before growth starts.
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Crocosmia in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Planting depth
- 3 in
- Lifecycle
- Perennial
- Spacing
- 6 to 8 in apart
- Hardiness
- Zones 5a to 9bFind my hardiness zone
Common problems
Watch for these
Also watch for: failure to bloom.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Crocosmia x crocosmiiflora (Common Montbretia, Crocosmia, Montbretia)
NC State Extension Gardener Plant Toolbox. Supports general reference. Checked 2026-06-18.
- African Bulbs (part three): Crocosmia (Garden Mastery Tips)
Washington State University Clark County Extension, Clark County Master Gardeners. Supports general reference. Checked 2026-06-18.