Description:
Spotted Knapweed is a biennial or short lived perennial with a stout taproot. It has one or more stems up to three feet tall. The plants produce a pinkish-purple flower at the end of each branch. Bracts have dark spots tipped with fringe. Leaves are finely divided.
 

• Mechanical: The plant may need to be cut several times, during growing season, to prevent seed production.
• Biological: Urahora Affinis & Uraphora quadrifasciata
• Herbicide: Refer to the State Noxious Weed Control Board site
• Cultural: Regrowth is hindered if a competitive crop of perennial grass is established

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