Mertens' Sedge
Carex mertensii
Last reviewed: June 2026
The USDA PLANTS Database (opens in new tab) does not flag Mertens' Sedge as toxic to livestock.
Light
part shade
Water
medium
Size
8"–24" H × 6"–12" W
Bloom
May, Jun, Jul
Native to
CA, ID, MT, OR and 1 more states
Browse plants for this ecoregion
Mertens' sedge is a clumping grass-like perennial that forms neat tufts of narrow green leaves. This native sedge thrives in partial shade with moderate water, producing small flower spikes in late spring and early summer. It maintains a tidy, compact appearance throughout the growing season.
In an HOA neighborhood
Mertens' Sedge is an HOA-friendly choice. Maintenance level: low. Tidiness: 4 out of 5.
Works well in: front yard, foundation, street edge, mid zone.
Wildlife value
This sedge provides habitat and nesting material for small birds and beneficial insects. The seeds offer food for songbirds and small mammals in late summer and fall.
Common questions
- How much sun does Mertens' Sedge need?
- Mertens' Sedge grows best in part shade conditions.
- When does Mertens' Sedge bloom?
- Mertens' Sedge blooms in May, June, and July.
- Where is Mertens' Sedge native?
- Mertens' Sedge (Carex mertensii) is native to CA, ID, MT, OR and 1 more states, per the USDA PLANTS Database and regional native plant society lists.
- Is Mertens' Sedge toxic to livestock?
- The USDA PLANTS Database does not flag Mertens' Sedge as toxic to livestock.
- Is Mertens' Sedge HOA-friendly?
- Mertens' Sedge is generally an HOA-friendly choice in the right placement, with low maintenance.
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.
Ready to grow Mertens' Sedge? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz