Cyperus haspan, commonly known as Haspan Flat Sedge, is a perennial herbaceous plant native to a wide range of wetland habitats including marshes, wet meadows, pond margins, and riverbanks in tropical and subtropical regions worldwide. This includes Africa, Asia, Australia, and the southeastern United States. It typically grows 1 to 2 feet tall, forming dense clumps of slender, grass-like foliage. The plant produces small, greenish-brown flower clusters atop triangular stems during the summer months, though the flowers are not particularly showy.

Haspan Flat Sedge is valued for its ability to thrive in wet conditions and is often used in water gardens, rain gardens, and as a soil stabilizer along waterways. It prefers full sun to part shade and requires consistently moist to wet soil conditions. While it is not demanding in terms of soil type, it does best in gravelly, sandy-clay soils with good water retention. Cyperus haspan is easy to maintain, but gardeners should be cautious as it can be potentially invasive outside its native range, particularly in similar wetland environments. It is advisable to manage its spread to prevent it from outcompeting native vegetation.CC BY-SA 4.0