White Snakeroot
Ageratina altissimaWhite Snakeroot is a perennial wildflower native to the Texas Hill Country that grows 2–4 ft tall and 2 ft wide. It wants full sun or part shade and low water, and handles clay soil. Blooms white in Jul–Nov. Good for bees, butterflies, caterpillars and moths.
Toxic — livestock, people. White snakeroot — tremetol causes milk sickness via contaminated milk.
Will it grow in your yard?
Enter your ZIP. The finder checks White Snakeroot against your microclimate, then ranks it against your sun, your watering and deer pressure.
The facts
5 sources- Type
- Perennial wildflower
- Sun
- Full sun to part shade (4–8 hrs of direct sun)
- Water
- Low
- Height
- 2–4 ft
- Spread
- 2 ft
- Bloom
- Jul–Nov · white
- Foliage
- Deciduous or dies back in winter
- Soil
- Takes clay · recorded on clay, dry, loam, moist, rich, rocky, well drained
- Wildlife
- Supports bees, butterflies, caterpillars and moths
Where it grows
Recorded in these EPA Level IV ecoregions in the Austin and Hill Country launch area:
56 occurrence records in Central Texas (GBIF).
Can you buy it?
Also grows here — hard to find. Native and recorded growing in Central Texas, but not on the grower stock lists we read. Sourcing varies: some are stocked widely, others you will have to hunt for.