Annual flower
Black-Eyed Susan plant profile
Rudbeckia hirta
An annual flower for full sun.
Last updated .
When to plant
When to plant Black-Eyed Susan
Transplant outdoors
at your last spring frost to 2 weeks after your last spring frost
Growing conditions
- Sun
- Full sun
- Lifecycle
- Annual
- Spacing
- 12 to 24 in apart
Common problems
Watch for these
Also watch for: rabbit damage, self seeding.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- 'Prairie Sun' Black-eyed Susan, Rudbeckia hirta
University of Wisconsin-Madison Division of Extension (Wisconsin Horticulture). Supports outdoor transplant timing (normalized). Checked 2026-06-13.