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perennial sowthistle plant
Perennial sowthistle is a Class C noxious weed on the Washington State Noxious Weed List. Control is not required in King County and it is on the non-regulated noxious weed list for the county. For more information about noxious weed regulations and definitions, see Noxious weed lists and laws.

Additional information on perennial sowthistle

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


If you wish to control perennial sowthistle, our program staff can provide site-specific advice on how best to remove it. The county isn't currently tracking locations of this species.

Report perennial sowthistle in King County, Washington

Locate perennial sowthistle 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).