Eleocharis compressa, commonly known as flat-stemmed spike-rush, is a perennial herbaceous plant native to a variety of wetland habitats including marshes, wet meadows, and the edges of ponds and streams across North America. It typically grows up to 1 foot tall and features a distinctive flattened stem, which is a key characteristic for identification. The plant produces small, inconspicuous brownish flowers from late spring to summer, which are not particularly showy but are important for local ecology.

Flat-stemmed spike-rush is valued for its role in wetland restoration and stabilization projects due to its ability to thrive in saturated soils and its dense root system, which helps to prevent soil erosion. It is also used in water gardens and as a ground cover in moist, boggy areas. This sedge prefers full sun to part shade and requires consistently wet soil conditions to flourish. While it is not typically grown for ornamental purposes, it can provide a naturalistic look in appropriate garden settings. Gardeners should be aware that in ideal wetland conditions, it can spread vigorously, potentially becoming invasive.CC BY-SA 4.0