Dunce-nettle
Cirsium muticum
Last reviewed: June 2026
Light
part sun
Water
medium
Size
24"–60" H × 12"–24" W
Bloom
Jul, Aug, Sep
Native to
AL, AR, CT, DE and 29 more states
Pollinators
bees, butterflies
Swamp thistle is a tall native perennial that produces clusters of pink to purple flowers from summer through early fall. Despite its common name, it's not aggressive like non-native thistles and provides excellent wildlife value in naturalized settings.
In an HOA neighborhood
Dunce-nettle 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.
- Thistle appearance triggers negative associations
- Can reach 5 feet tall
- Dies back completely in winter leaving bare stems
Wildlife value
The flowers are magnets for native bees, butterflies, and other pollinators during late summer blooms. Seeds provide food for goldfinches and other birds in fall.
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 Dunce-nettle fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.