Eurasian watermilfoil
Myriophyllum spicatum

This Class B noxious weed is widespread throughout Washington State. Control is not required but recommended in King County.

Eurasian watermilfoil is a submerged aquatic plant that is present in many lakes in King County, especially lakes with public boat launches. In order to prevent further spread of this and other aquatic weeds, boaters should clean all vegetation from boats and trailers before moving between lakes. If Eurasian watermilfoil is detected early enough, it may be possible to control it.

Additional information on eurasian watermilfoil

• Washington State Noxious Weed Control Board (external link)
• King County Best Management Practices for Milfoil
• WA State Department of Ecology.

What to do if you find this plant in King County, Washington

Please notify us if you see eurasian watermilfoil 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 eurasian watermilfoil in order to help us and others locate new infestations in time to control them.

Milfoil impacts - click thumbnail for larger image