Introduced in Europe, Asia, Australia. Quiet waters of marshes, lakes, and streams, to depths of 25' or more. Also the Great Lakes. Often forms large masses. By Seed Flowers June-August Male flowers rise on long stalks and split open, spreading pollen onto the water's surface where it drifts and may, by chance, reach a female flower.
Pollination occurs at the water's surface at the whim of wind and wave.
By fragmentation of the stem.