As a botanist once told me, "rushes are round, sedges have edges," but he never mentioned 'Big Twister' Rush with its corkscrew foliage. Technically classified as a perennial, 'Big Twister' will remain green during warmer winters, but will brown out during prolonged freezes. Simply give this unruly foliage a haircut in early spring to make way for the new growth. Provides unusual texture to container planters and thrives in boggy garden spots.