To offer a suggestion or report an error on the King County Noxious Weeds Web site, please contact Sasha Shaw, education specialist.
Slenderflower Thistle Carduus tenuiflorus
This Class A noxious weed has a limited distribution in Washington State and has not been observed in King County. Eradication of this Class A weed is required throughout Washington State. Slenderflower thistle invades pastures, meadows, and fields, displacing native and/or beneficial forage species.
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.
This Class A noxious weed has a limited distribution in Washington State and has not been observed in King County. Eradication of this Class A weed is required throughout Washington State. Slenderflower thistle invades pastures, meadows, and fields, displacing native and/or beneficial forage species. 
for slenderflower thistle.