White Snakeroot (Ageratina altissima) is a graceful woodland native that produces clusters of small, fluffy white flowers in late summer to early fall. The blooms appear just as many other flowers begin to fade, providing an important late-season nectar source for pollinators. Bees, butterflies, moths, and many other beneficial insects visit the abundant flowers, and the foliage supports several caterpillars, including the Ruby Tiger Moth. Its soft, cloud-like blooms brighten shady gardens and woodland edges while adding valuable habitat for wildlife. The bitter foliage is typically avoided by deer and other mammalian herbivores.
 
White Snakeroot contains a natural compound called tremetol that can be toxic to livestock if eaten in large amounts; historically this was linked to “milk sickness,” though modern pasture management has made such cases very rare today.