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Hydrilla (Hydrilla verticillata) is a nonnative, invasive aquatic plant that is rooted and can grow to almost 30 feet, filling up the water column. The best way to control it is to prevent its spread.
Some of the most serious invasive plants in the Great Plains are the old world bluestems (i.e. yellow, Caucasian, plains, King Ranch, B. Dahl), sericea lespedeza, eastern redcedar, musk thistle, Bradford or callery pear, and salt cedar.