White Snakeroot
Ageratina altissima
Last reviewed: June 2026
Light
part sun
Water
medium
Size
24"–60" H × 18"–36" W
Bloom
Jul, Aug, Sep
Native to
AL, AR, CT, DE and 33 more states
Pollinators
bees, butterflies, beetles
Browse plants for this ecoregion
White snakeroot is a tall native perennial that produces clusters of small white flowers from summer into fall. It grows 2-5 feet tall and spreads naturally through underground rhizomes and self-seeding.
In an HOA neighborhood
White Snakeroot takes more care to keep looking intentional in a front yard. Maintenance level: moderate. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Can spread aggressively and look weedy
- All parts are toxic to humans and livestock
- May be perceived as wild or uncontrolled
Wildlife value
Host plant for white-lined sphinx moth.
The late-season blooms are valuable for bees, butterflies, and beetles when many other flowers have finished. It serves as a host plant for some moth caterpillars.
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 White Snakeroot fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.