Brown knapweed
Centaurea jacea

Legal status in King County, Washington

This Class B noxious weed has a limited distribution in Washington and control is required in King County.

Additional information on brown knapweed

• Washington State Noxious Weed Control Board (external link)
• Selected Knapweeds of Washington is an informative color brochure describing knapweeds. (316 KB) Acrobat file

What to do if you find this plant in King County, Washington

Please notify us if you see brown knapweed growing in King County. Our program staff can provide the property owner or appropriate public agency with site-specific advice on how best to remove it. Also, because brown knapweed is not established in King County, we have an opportunity to stop it from spreading if we act quickly. We map all known locations of regulated noxious weeds such as brown knapweed in order to help us and others locate new infestations in time to control them.

Brown knapweed photos

For detailed photos of brown knapweed, see this microscopy UK page with amazingly detailed photos of this species.