University of Illinois Extension
Directory of Wildflowers - University of Illinois Extension

Directory of Wildflowers

Prairie Dock
Silphium terebinthinaceum

Prairie Dock (note very long flower stalks)
Prairie Dock (note very long flower stalks)

Quick Profile

Exposure
Full Sun
 
Mature Height
4 - 9 Feet
 
USDA Hardiness Zones
4 - 9 
 
Native To:
Illinois
Indiana
Iowa
Michigan
Missouri
Ohio
Wisconsin
 
Soil Conditions
Moist, Well-Drained
 
Bloom Color
Yellow
 
Bloom Season
August - October
 

Features

Yellow, daisy-like flowers on very long flower stalks. Large leaves at the base of the plant (up to 2 feet long).

Culture

Full sun; moist, well drained soils.

Notes

Found in prairies. This plant has a taproot which makes it difficult to transplant.