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Russian knapweed flower
This Class B noxious weed has a limited distribution in Washington and control is required in King County. For more information on noxious weed regulations and definitions, see Noxious weed lists and laws.

Additional information on Russian knapweed

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

Please notify us if you see Russian 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 Russian 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 Russian knapweed in order to help us and others locate new infestations in time to control them.

Report russian knapweed in King County, Washington

Locate russian knapweed in King County, Washington

Related information

Related agencies


Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact staff, see the Noxious Weed Control Program Directory, send an email, or call 206-477-WEED (206-477-9333).