Cowbane
Oxypolis rigidior
Last reviewed: July 2026
Light
part sun
Water
high
Size
24"–60" H × 12"–24" W
Bloom
Jul, Aug, Sep
Native to
AL, AR, DE, FL and 23 more states
Pollinators
bees, beetles, flies
Cowbane is a tall native perennial with clusters of small white flowers that bloom from summer into early fall. This wetland plant thrives in consistently moist to wet soils and partial sun conditions. It forms clumps that can reach up to 5 feet tall with an upright, somewhat formal appearance.
In an HOA neighborhood
Cowbane 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.
- Name includes 'bane' which may concern neighbors
- Requires consistently wet conditions uncommon in typical yards
- Can appear wild and unstructured to conservative tastes
Wildlife value
The umbrella-shaped flower clusters attract a variety of pollinators including native bees, beetles, and flies during the summer blooming period.
Common questions
- How much sun does Cowbane need?
- Cowbane grows best in part sun conditions.
- When does Cowbane bloom?
- Cowbane blooms in July, August, and September.
- Where is Cowbane native?
- Cowbane (Oxypolis rigidior) is native to AL, AR, DE, FL and 23 more states, per the USDA PLANTS Database and regional native plant society lists.
- What pollinators does Cowbane attract?
- Cowbane draws bees, beetles, and flies.
- Is Cowbane HOA-friendly?
- Cowbane 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 Cowbane? 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