(Scirpus cyperinus) Each stem is topped by a large, shaggy brownish inflorescence drooping several inches long. This large native sedge may first be noticed as a colony of 6 ft. tall. It is found growing in marshes, swamps, and pond margins. It blooms from summer to fall. Wool-grass occurs almost always under natural conditions in wetlands.  Wool Grass actively grows during the spring and fall when soil temperatures are cool. It is often used to regenerate wetland areas and encourage the return of native birds.