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orange hawkweed (hieracium aurantiacum)
PLEASE CALL 1-866-INVADER IF YOU SUSPECT YOU HAVE FOUND THIS SPECIES
 
USDA Symbol: HIAU

ODA rating: A, T
Orange hawkweed risk assessment
Noxious weed listing process


Distribution
Oregon orange hawkweed distribution
 
Other common names
Devil's paintbrush
 
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Photo by Bonnie Rasmussen, Oregon Department of Agriculture

Photo by Jim Schultz, Hines, Oregon
 
Photo by Bonnie Rasmussen, Oregon Department of Agriculture
 
If images are downloaded and used from the ODA web site please be sure to credit the photographer.
 
Description
Orange hawkweed is a perennial weed with above-ground runners (stolons) that root at the tips. Roots are shallow and fibrous. The plant grows up to 12 inches tall and contains milky juice. The vibrant orange-red colored flowers are clustered at the top of a leafless stem. Stiff, black, glandular hairs cover flower stalks. Leaves are hairy, lance shaped, up to five inches long, and exclusively basal.
 
Impacts
Once established, hawkweed quickly develops into a patch that continues to expand until it covers the site with a solid mat of rosettes. A dense mat of hawkweed plants has the potential to eliminate other vegetation. It displaces native vegetation posing a serious threat to native plant communities and can dominate pastures, lawn and roadsides.  It is unpalatable and crowds out more desirable species.  This invader weed from Europe thrives in poor non cultivated and disturbed soils. Orange hawkweed occurs on native meadows, gravel pits, forest openings, permanent pastures, roadsides, and hayfields. It prefers well-drained, coarse textured soils that are moderately low in organic matter. Hawkweeds do not persist in cultivation.
 
Introduction
Orange hawkweed is found from western Washington to Wyoming and is known to occur in eastern states.  Due to its striking flowers, plant enthusiasts have assisted in the distribution of this weed.
 
Distribution in Oregon
In Oregon, distribution is limited to a few sites. One established population is known in Clackamas County and a few ornamental plantings have been reported and confirmed in Deschutes County.
 
For a collection of spatial information on the distribution of this plant in Oregon go to Oregon WeedMapper
 

 
Biological controls
No approved biocontrol agent currently available for this weed. Orange hawkweed is an “A” listed noxious weed in Oregon, meaning that is very limited in distribution. All known infestations are under intensive management for eradication or containment.

Printable trifold orange hawkweed brochure (pdf)