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Herb Robert identification and control: Geranium robertianum

Herb Robert identification and control

Geranium robertianum, Geraniaceae Family

Herb Robert Flower Closeup - click for larger image
Herb Robert escaped from ornamental plantings and thrives in forested communities as the dominant ground cover, displacing native and beneficial plants.

Herb Robert's 5-petaled flowers are in all shades of pink and sometimes white. Overall the plant is covered with short glandular hairs, giving the plant a sticky feel and a distinct odor (sometimes this plant is known as "stinky Bob"). Shallow, weak roots make this plant easy to pull although large infestations can be highly labor-intensive to remove.

Legal status in King County, Washington

This non-regulated Class B noxious weed is widespread in western Washington. Control is recommended, but not required in King County. For more information, see Noxious weed lists and laws.

herb Robert plants

Additional information on herb Robert

Herb Robert photos - click thumbnail for larger image

Herb Robert rosette
Herb Robert Ivy Blackberry
herb robert infestation near Skykomish

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).