It tolerates a wide range of water conditions, and often forms large infestations. They are branched and commonly grow to lengths of six to nine feet. The leaves are deeply divided, soft and feather-like.
Leaves are about two inches long.
The leaves are arranged in whorls of three to six leaves about the stem. The flowers of Eurasian water milfoil are reddish and very small. They are held above the water on an emersed flower spike that is several inches long.