Very distinguishable with leaves 3-4″ long that are ruffled or wavy. Originally from Eurasia, it thrives in US waters in conditions inhospitable to other plants. One of the first plants to arrive in the Spring it grows well in cold water.
Once present in a body of water they will quickly displace other native species and clog the water with their dense mass. Able to produce turions, a specialized seed, they can survive drought and freezing conditions for many seasons.
Chemical control is effective but once established many years of consistent treatment are often required to eliminate the invader.