Ageratina altissima [sold as White Snakeroot] White Snakeroot
White (Small, fragrant, tubular flowers densely packed into flat-topped clusters; blooms from late summer into fall)
Green (Opposite, ovate to heart-shaped leaves with coarse serrated margins and prominent veins)
Green to purplish-brown (Erect, branching stems that may become purplish in sunny conditions)
Black (Small dry achenes produced in fall and equipped with white bristles for wind dispersal)
3-5 feet
2-4 feet
Prefers moist, humus-rich, well-drained soils; adaptable to clay and woodland soils
Eastern and central North America, from southern Canada through much of the eastern and central United States
