white snakeroot
Ageratina altissima
USDA zones3 to 9
SunHandles full sun to full shade
WaterHandles dry to moist soil
Size3 to 5 feet tall2 to 4 feet wide
- Growth rate
- Moderate
- Habit
- Herb
- Bloom season
- Summer, autumn
- Bloom color
- White
- Foliage color
- Green
- Soil types
- Loam, clay, chalk
- Soil pH
- Alkaline, neutral
- Toxicity
- Toxic to pets
Garden uses
Attracts
Notes
White snakeroot (Ageratina altissima) is a perennial for borders, pollinator gardens, and meadows. It is hardy to USDA zone 3, or down to -40°F (-40°C). This plant likes full sun to full shade and dry to moist, loamy, clay, or chalky soil. Flat-topped clusters of small, fuzzy white flowers open from summer into autumn and draw butterflies, bees, and birds. Deer rarely make it their first choice. Keep pets away from it, since it is toxic to pets.
Pairs well with Hardy geranium, Morning Light eulalia, and Aureola Japanese forest grass.
Native range
AL, AR, CT, DC, and 38 more places. See all 42
AL, AR, CT, DC, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, ND, NE, NH, NJ, NY, OH, OK, PA, RI, SC, SD, TN, TX, VA, VT, WI, WV; NB, NS, NT, ON, and SK.