Carex litorosa, commonly known as Sea Sedge, is a deciduous perennial grass native to coastal areas, estuaries, and wetlands of New Zealand. It typically grows to a height and width of 2-3 feet (0.6-0.9 meters), forming dense clumps of narrow, arching green leaves. The plant produces inconspicuous brown flower spikes in late spring to early summer, which are more interesting for their texture than for showy color. Sea Sedge is valued for its ability to stabilize soil and for its use in water purification in its native habitat.

In cultivation, Sea Sedge is appreciated for its ease of maintenance and its tolerance of wet conditions, making it suitable for rain gardens, water features, and as a ground cover in damp areas. It can thrive in full sun to part shade and prefers soils with wet or slow drainage, though it can adapt to drier conditions once established. This sedge is also used in erosion control and as habitat for wildlife. While generally disease-free, it can occasionally suffer from rust or root rot in poorly drained soils.CC BY-SA 4.0