Cyperus laevigatus, commonly known as smooth flatsedge, is a perennial sedge native to a variety of wetland habitats including coastal marshes, riverbanks, and the margins of hot springs in tropical and subtropical regions. Its native range spans the Americas, Africa, the Mediterranean, Australia, and Asia. Smooth flatsedge typically grows up to 24 inches tall and is characterized by its cylindrical spikelets, which can vary in color from green to dark brown. It thrives in wet areas, particularly in brackish and saline soils.

Smooth flatsedge is valued for its ability to stabilize soil in erosion-prone areas and is often used in restoration projects for this purpose. It is also appreciated for its simple, yet attractive appearance in water gardens and naturalized plantings. In cultivation, it requires consistently moist to wet soil conditions and can tolerate a range of light exposures from full sun to partial shade. However, it is potentially invasive in some regions, and gardeners should be cautious about planting it outside its native range. Its aggressive growth can outcompete native vegetation, so it is important to check local regulations and invasive species lists before cultivation.CC BY-SA 4.0