Black Eyed Susan (Rudbeckia hirta)-Hort Answers - University of Illinois Extension
University of Illinois Extension

University of Illinois Extension

Hort Answers

Wildflowers

Black Eyed Susan
Rudbeckia hirta

Black Eyed Susan
Black Eyed Susan
 
Features

Yellow daisies with drooping petals and a dark cone in the center.

 
 
Culture

Full sun; moist, well drained soils. Avoid crowding plants to reduce fungal problems. Tolerates some dryness.

 
 
Mature Height
1-3 Feet
 
Native To:
Illinois
Indiana
Iowa
Michigan
Missouri
Ohio
Wisconsin
 
USDA Hardiness Zone
3 - 10 
 
Bloom Color
Yellow
 
 
Bloom Season
June - October
 
Soil Conditions
Dry
Moist, Well-Drained
 
 
Exposure/Light Requirements
Full Sun
 
 
Pests and Problems

Environmental Damage


Additional pests and problems that may affect this plant:

Rust, gray mold and mildew fungi can mar the foliage.
 
Additional Notes

Found in fields and open woods. This species may be biennial or perennial, but is often utilized in the garden as an annual.