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St. Johnswort Hypericum perforatum
This species should not be confused with the ornamental St. Johnswort found in gardens. Common St. Johnswort is taller and less dense, with smaller flowers. Usually found along roadsides and in empty lots in western WA, this weedy species can also be found in natural areas. In eastern WA and in other regions of the western US, common St. Johnswort is widespread and difficult to control.
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 species should not be confused with the ornamental St. Johnswort found in gardens. Common St. Johnswort is taller and less dense, with smaller flowers. Usually found along roadsides and in empty lots in western WA, this weedy species can also be found in natural areas. In eastern WA and in other regions of the western US, common St. Johnswort is widespread and difficult to control. 
