Carex curvicollis, commonly known as Curved Sedge, is a perennial herbaceous plant belonging to the sedge family. It is native to wetland areas, moist meadows, and along stream banks in parts of Japan, where it forms dense tussocks. This sedge typically grows to a height of 20-30 cm and has a clumping growth habit. The foliage is narrow and arching, with a distinctive curved appearance that gives the plant its common name. Curved Sedge does not produce showy flowers; instead, it bears inconspicuous brownish-green flower spikes in late spring to early summer.

Curved Sedge is valued for its textural interest in garden settings, particularly in moist or wet areas where it can form a lush ground cover. It is often used in rain gardens, around ponds, and in other water-wise landscaping designs. This plant prefers consistently moist soils and can tolerate partial shade to full sun conditions. It is generally low-maintenance but may require division every few years to maintain vigor. While not commonly afflicted by diseases, it can suffer from root rot if planted in overly saturated soils.CC BY-SA 4.0