Carex trisperma, commonly known as Three-seeded Sedge, is a perennial herbaceous plant native to cool, moist, acidic bogs and wetlands within northern coniferous and mixed forests. It is found in Canada, Greenland, and the northeastern United States. This sedge typically forms clumps reaching 20-60 cm in height and spreads slowly by rhizomes. Three-seeded Sedge has narrow, grass-like leaves and produces inconspicuous greenish-brown flowers in late spring to early summer. The flowers are followed by distinctive three-seeded, beaked fruits that give the plant its common name.

Three-seeded Sedge is valued for its ability to thrive in wet, acidic soils where many other plants struggle. It is often used in naturalized plantings, rain gardens, and as a ground cover in moist, shaded areas. This sedge prefers partial to full shade and consistently moist to wet soil conditions. It is not drought-tolerant and requires a habitat that can provide adequate moisture. While not particularly prone to diseases or pests, it can suffer in conditions that are too dry or sunny. Three-seeded Sedge is not known for being invasive and is a beneficial addition to native plant gardens, providing habitat and food for wildlife.CC BY-SA 4.0