
Common St. Johnswort identification and control
Hypericum perforatum
Legal status in King County, Washington
Common St. Johnswort is a Class C noxious weed on the Washington State Noxious Weed List. It is on the Non-Regulated Noxious Weed List for King County, Washington. Control of Common St. Johnswort in King County is recommended but not required. For more information on noxious weed regulations and definitions, see Noxious weed lists and laws.
The King County Noxious Weed Control Board encourages property owners to remove Common St. Johnswort where possible and to avoid introducing it to new landscapes.
Additional information on common St. Johnswort
- Washington State Noxious Weed Control Board (external link)
What to do if you find this plant in King County, Washington
Because Common St. Johnswort is so widespread, property owners in King County are not required to control it and we are not generally tracking infestations. We can provide advice on how to control Common St. Johnswort, but there is generally no legal requirement to do so.
Common St. Johnswort photos
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).