How to grow cosmos
Cosmos bipinnatus
Get your exact dates
The windows below are relative to your frost dates. Enter your ZIP for the calendar dates.
Open the planting calendarWhen to plant cosmos
Direct sowat your last spring frost to 2 weeks after your last spring frost
Growing conditions
- Spacing
- 12 to 24 in apart
- Planting depth
- 0.125 in
- Sun
- Full sun
Common problems
- self seeding
- weed competition
Cosmos by hardiness zone
Planting dates for a typical location in each zone:
Sources
Last updated 2026-06-13.