Carex halliana, commonly known as Hall’s sedge, is a tussock-forming perennial sedge native to moist meadows, wetlands, and riparian zones in the western United States, particularly in the Pacific Northwest and Northern California. It typically forms dense clumps with sharply triangular stems that can reach up to 31 inches tall. Hall’s sedge is dioecious, meaning individual plants bear either male or female flowers, which are not particularly showy but are ecologically significant for local fauna.

Hall’s sedge is valued for its ability to stabilize soil and prevent erosion in wet areas. It is often used in restoration projects, rain gardens, and as a naturalizing element in water-wise landscaping. In cultivation, it prefers consistently moist soils but can tolerate seasonal dryness once established. It thrives in full sun to part shade conditions. While generally low-maintenance, it can spread if conditions are favorable, potentially becoming aggressive in garden settings.CC BY-SA 4.0