Perennial sowthistle identification and control
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
- Washington State Noxious Weed Control Board (external link)
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
- Please notify us through our online infestation form
Locate perennial sowthistle in King County, Washington
- Use our interactive noxious weed map and search for perennial sowthistle