Meadow knapweed identification and control
Centaurea x moncktonii
Legal status in King County, Washington
Class B noxious weed. Property owners in King County are required to control meadow knapweed. It is also on the Washington quarantine list (known as the prohibited plants list) and it is prohibited to transport, buy, sell, offer for sale, or to distribute plants or plant parts, seeds in packets, blends or "wildflower mixes" of this species, into or within the state of Washington. For more information on noxious weed regulations, see Noxious weed lists and laws.
Biology and morphology
Additional information on meadow knapweed
- Washington State Noxious Weed Control Board (external link)
What to do if you find this plant in King County, Washington
Please notify us if you see meadow knapweed growing in King County. Our program staff can provide the property owner or appropriate public agency with site-specific advice on how best to remove it. We map all known locations of regulated noxious weeds such as meadow knapweed in order to help us and others locate new infestations in time to control them.
Meadow knapweed photos
Report meadow knapweed in King County, Washington
- Please notify us through our online infestation form
Locate meadow knapweed in King County, Washington
- Use our interactive noxious weed map and search for meadow knapweed