Description:
Description and Variation: Yellow hawkweed has bristly-haired, narrow, elongated leaves four to six inches long. The leaves are attached near ground level and the flowering stalk, arising from the leaf cluster, is leafless. The flowering stalks grow from a few inches to three feet in height; the stems have short, stiff hairs and contain a milky latex sap inside the stem. The flowers, which are about the same shade of yellow as buttercups, occur in heads that are about 3/4 of an inch in diameter.

• Mechanical: In scattered patches of small size, the simplest mode of attack is to dig them out, making sure that all of the below-ground growth is also removed, since even a small piece may develop into a new plant. These plants should be either burned or placed in a refuse pile where they can do no harm.
• Biological: Dr. Joe McCaffrey of the University of Idaho is currently investigating possible biocontrol agents.
• Herbicide: Early season treatment with picloram, combinations of picloram plus 2,4-D, or dicamba mixed with 2,4-D can be effective in controlling the hawkweed, but 2,4-D alone is inadequate. See current herbicide labels and recommendations for herbicide doses to be used. Refer to the State Noxious Weed Control Board site

For More Information:
Detailed information about Yellow Hawkweed is available at the Washington State Noxious Weed Control Board Web Site.