Old-Field Three-Awn
Aristida oligantha
Last reviewed: June 2026
Light
full sun
Water
low
Size
12"–36" H × 6"–12" W
Bloom
Jul, Aug, Sep
Native to
AL, AR, AZ, CA and 39 more states
Browse plants for this ecoregion
Prairie Three-awn is a native annual grass that forms small, upright clumps with fine-textured foliage. It produces distinctive three-pronged seed heads from summer through fall and requires minimal water once established. This grass thrives in poor, sandy soils where other plants struggle.
In an HOA neighborhood
Old-Field Three-Awn 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.
- Annual lifecycle creates gaps in plantings
- Seed heads can appear weedy or unkempt
- Fine texture may look sparse compared to traditional grasses
Wildlife value
The seeds provide food for native birds and small mammals. As a native grass, it supports various insects and contributes to local ecosystem health.
Common questions
- How much sun does Old-Field Three-Awn need?
- Old-Field Three-Awn grows best in full sun conditions.
- When does Old-Field Three-Awn bloom?
- Old-Field Three-Awn blooms in July, August, and September.
- Where is Old-Field Three-Awn native?
- Old-Field Three-Awn (Aristida oligantha) is native to AL, AR, AZ, CA and 39 more states, per the USDA PLANTS Database and regional native plant society lists.
- Is Old-Field Three-Awn HOA-friendly?
- Old-Field Three-Awn 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 Old-Field Three-Awn? 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