Cyperus polystachyos, commonly known as manyspike flatsedge or bunchy sedge, is a perennial herbaceous plant native to a wide range of habitats including tropical and subtropical regions worldwide, often found in wetlands, along rivers and creeks, in rainforests, swamps, and coastal areas. It is adaptable to both temperate and tropical climates. This sedge typically grows to a height of 0 to 2 feet and has a clumping growth habit. It produces green-brown spikelets from summer to winter, which are not particularly showy but are interesting texturally.

Manyspike flatsedge is valued for its ability to thrive in moist and wet environments, making it suitable for water gardens, rain gardens, and as a ground cover in wet areas. It is also used for erosion control along waterways. In cultivation, it prefers full sun to part shade and requires consistently moist to wet soil conditions. While it is not known for significant diseases or pests, its aggressive growth can be problematic if not managed properly. It is potentially invasive in some regions, so gardeners should check local regulations before planting.CC BY-SA 4.0