Horseweed
Conyza canadensis
Last reviewed: June 2026
Light
full sun
Water
low
Size
12"–60" H × 6"–24" W
Bloom
Jul, Aug, Sep, Oct
Native to
RI
Pollinators
bees, butterflies, beetles
Browse plants for this ecoregion
Horseweed is a tall annual wildflower that produces clusters of small white to greenish flowers from summer through fall. This native plant can reach up to 5 feet tall and readily self-seeds, often appearing in disturbed soils and open areas.
In an HOA neighborhood
Horseweed 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.
- Aggressive self-seeder often considered weedy
- Tall growth habit can appear unkempt
- Common in vacant lots and disturbed areas
Wildlife value
Host plant for American Lady, Painted Lady.
The small flowers attract various pollinators including bees, butterflies, and beetles during its extended blooming period. Seeds provide food for birds, particularly finches and sparrows.
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 Horseweed fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.