Common threesquare

Schoenoplectus pungens

Formerly Scirpus pungens. Cool season, rhizomatous, native grasslike perennial occurring on muddy shores and standing water of marshes, playas, ponds, streams and lakes below 6,500 ft. elevation. Tolerates alkaline, saline and freshwater conditions. May survive seasonal drought. Good for wetland projects. Roots and rhizomes an important food source for geese and muskrats; nesting for numerous other species.