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The top eight problem aquatic weeds in King County

As part of the Lake Stewardship Program, identification cards were created for the top eight peskiest aquatic weed species. To learn more about these eight plants and how to spot them, click on the links below.

Emergent weeds on the shoreline:

Reed canary grass

Purple loosestrife

Floating weeds on the lake surface:

Water hyacinth

Submergent weeds under the lake surface:

Eurasian watermilfoil

Parrotfeather milfoil



Brazilian elodea

For more information about other noxious weeds in King County, please check out the King County Noxious Weed Control Program website.

For questions about lakes in King County, please contact or call the Water and Land Resources Division front desk at 206-477-4800.