Ageratina adenophora, commonly known as Crofton weed or sticky snakeroot, is a perennial herbaceous shrub that is native to the highlands of Mexico. It typically grows 3-7 feet in height and features trowel-shaped, serrated leaves that are 2-4 inches long. The plant is characterized by its clusters of small, fluffy, creamy white flowers that bloom in late spring and summer, which are moderately showy and attract pollinators. Crofton weed prefers semi-shaded environments and is often found in disturbed areas such as roadsides, pastures, and forest margins.

Crofton weed is known for its rapid growth and ability to spread quickly through both wind-dispersed seeds and vegetative propagation. This makes it a potential problem plant due to its invasiveness in regions outside its native habitat, where it can outcompete native flora and disrupt local ecosystems. In cultivation, it requires minimal care, thriving in a range of soil types with good drainage and moderate water. It can be used for erosion control or as a filler plant in garden borders, but caution is advised due to its invasive nature. Before planting Ageratina adenophora, it is crucial to check local regulations and its invasive status in the area.CC BY-SA 4.0