Marsh Arrow-grass
Triglochin palustris
Last reviewed: June 2026
Light
full sun
Water
high
Size
4"–16" H × 2"–8" W
Bloom
May, Jun, Jul, Aug, Sep
Native to
AZ, CA, CO, IA and 22 more states
Browse plants for this ecoregion
Marsh arrow-grass is a slender wetland perennial with narrow, grass-like leaves that forms small clumps in consistently moist to wet soils. It produces inconspicuous spikes of tiny greenish flowers from late spring through early fall. This plant thrives in full sun and requires constant moisture, making it ideal for rain gardens or bog areas.
In an HOA neighborhood
Marsh Arrow-grass takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Requires constantly wet conditions that may create drainage concerns
- Grass-like appearance could be mistaken for unmaintained turf
- Inconspicuous flowers provide little ornamental appeal
Wildlife value
While specific pollinator data is limited, this native wetland plant likely provides habitat value for moisture-loving insects and small wildlife. Its seeds may provide food for waterfowl and wetland birds.
Common questions
- How much sun does Marsh Arrow-grass need?
- Marsh Arrow-grass grows best in full sun conditions.
- When does Marsh Arrow-grass bloom?
- Marsh Arrow-grass blooms in May, June, July, August, and September.
- Where is Marsh Arrow-grass native?
- Marsh Arrow-grass (Triglochin palustris) is native to AZ, CA, CO, IA and 22 more states, per the USDA PLANTS Database and regional native plant society lists.
- Is Marsh Arrow-grass HOA-friendly?
- Marsh Arrow-grass takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
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 Marsh Arrow-grass? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
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