Carex deweyana is a deciduous sedge found in woodlands, thickets, shady shores, or the edges of wetlands. It prefers full to partial shade and dry to moist soils. It is a clump-forming perennial with fine-textured leaves. It grows to 30cm tall with leaves that are usually dark green paired with spikes of inconspicuous, greenish-brown flowers in spring and early summer.
The plant is popular for landscaping, as it adds texture and interest to wetland or stream-side gardens. This species is generally low maintenance and is considered to be drought-tolerant.