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King County, Washington Noxious Weed Identification and Control

Slenderflower Thistle
Carduus tenuiflorus

Slenderflower thistle plantThis Class A noxious weed has a limited distribution in Washington State; control and eventual eradication is required in King County. Slenderflower thistle invades pastures, meadows, and fields, displacing native and/or beneficial forage species.

For more information about slenderflower thistle, please follow the link to the WA State Noxious Weed Control Board (external link).

If you find slenderflower thistle in King County, please notify us through our online infestation form.

To find out where we have records of this weed in King County, use our interactive noxious weed map and search Map find for slenderflower thistle.

 

 

 

 

 

 

 

 

 

Related Information:

Agencies

Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact a staff member at the King County Noxious Weed Control Program, please call 206-296-0290 or by reach them by email.