Eurasian watermilfoil is an aquatic plant. Its stems tend to be limp, and may show a pinkish-red color. The leaves are typically divided into 12 or more pairs of threadlike leaflets. The most common native watermilfoil, northern watermilfoil, tends to have whitish or brownish stems, and leaves that divide into fewer than 10 pairs of leaflets.
How It Spreads
Eurasian watermilfoil was probably intentionally introduced to the United States. After being planted in waterbodies around the continent, its spread continued naturally as pieces of it were disseminated in flow and by motorboat traffic. Today, transport on boating equipment plays the largest role in introducing fragments to new waterbodies. It continues to spread through the aquarium and water garden trades as well.
Impacts to Rivers