Knotsheath Sedge
Carex retrorsa
Last reviewed: June 2026
Light
part shade
Water
high
Size
12"–36" H × 6"–18" W
Bloom
May, Jun, Jul
Native to
CO, CT, IA, ID and 15 more states
Knotsheath sedge is a native perennial grass-like plant that forms clumps of arching green foliage. It thrives in moist to wet conditions and partial shade, making it ideal for rain gardens or naturally damp areas. This sedge produces inconspicuous flowers from May through July.
In an HOA neighborhood
Knotsheath Sedge takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Requires consistently wet conditions that may look problematic
- Goes completely dormant in winter leaving bare spots
- Informal grass appearance conflicts with traditional landscaping
Wildlife value
While not a major pollinator plant, this sedge provides habitat and nesting material for birds and supports various insects. The seeds are eaten by waterfowl and songbirds, particularly in wetland edge environments.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Knotsheath Sedge fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.