Annual flower
Cosmos plant profile
Cosmos bipinnatus
An annual flower for full sun.
Last updated .
When to plant
When to plant Cosmos
Direct sow
at your last spring frost to 2 weeks after your last spring frost
Growing conditions
- Sun
- Full sun
- Planting depth
- 0.125 in
- Lifecycle
- Annual
- Spacing
- 12 to 24 in apart
Common problems
Watch for these
Also watch for: self seeding, weed competition.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Cosmos in the Garden
Utah State University Extension. Supports direct-sowing timing (normalized). Checked 2026-06-13.