Thinleaf Cottonsedge
Eriophorum viridicarinatum
Last reviewed: June 2026
Light
part sun
Water
high
Size
8"–24" H × 6"–12" W
Bloom
May, Jun, Jul
Native to
CO, CT, IA, ID and 16 more states
Pollinators
bees, flies
Thinleaf cottonsedge is a native wetland perennial that forms small clumps of narrow, grass-like foliage. It produces distinctive white, fluffy seed heads from late spring through summer that give it its common name. This plant thrives in consistently moist to wet soils and partial sun conditions.
In an HOA neighborhood
Thinleaf Cottonsedge takes more care to keep looking intentional in a front yard. Maintenance level: moderate. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Looks wild and unmanicured even when healthy
- Requires constantly wet soil that may be impractical in typical landscapes
- Fluffy seed heads can appear messy to some
Wildlife value
The flowers attract bees and flies during its May through July bloom period. The fluffy seed heads provide material for bird nesting and the plant offers habitat for wetland-associated wildlife.
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 Thinleaf Cottonsedge fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.