Grey sedge is a densely tufted, native, perennial. Like most sedges its stem is triangular in cross-section but with this species the angles are distinctly rounded. The leave are normally greyish to dark green which distinguishes it form the yellowish green leaves of the other British subspecies C. divulsa subsp. leersii, sometimes known as Many-leaved Sedge.
Grey sedge can be found on a wide range of soils, but is not tolerant of highly acidic sites. Most frequently found along woodland borders, banks, scrub, and other rough, open grassland.
Seed is best sown in late summer or autumn.