In stretches of the Chehalis River between Montesano and Plummer Lake, which is located in Centralia, grows the aquatic noxious weed Brazilian elodea. This perennial herb is commonly used in home aquariums, and following its introduction into the Chehalis River, it has had negative effects upon aquatic ecosystems, which is the reason for its designation as a Class B noxious weed by the Washington State Noxious Weed Control Board.
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