Scotch broom , Parrotfeather , Tansy ragwort , Spotted knapweed, Lawnweed, Meadow knapweed, Eurasian watermilfoil, Leafy spurge, Brazilian elodea, Diffuse knapweed, Velvetleaf and Yellow nutsedge.
Noxious weeds are non-native plants that have been introduced to Washington through human actions.
Because of their aggressive growth and lack of natural enemies in the state, these species can be highly destructive, competitive or difficult to control. These exotic species can reduce crop yields, destroy native plant and animal habitat, damage recreational opportunities, clog waterways, lower land values, and poison humans and livestock. To help protect the state's resources the Washington State Noxious Weed Control Board adopts a State Noxious Weed List each year. The Lewis County Noxious Weed List is made up of all Class A weeds, Class B designates and any selections by the County Board from the Class B or Class C weed list. The noxious weeds identified with a bold will receive the highest priority for educational, surveying and enforcement activities by the Lewis County Noxious Weed Control Board.