Common Name
Plant Form
Herbs
Considered Invasive?
Yes
Threat Level
High
Additional Info
Notes: This plant is still available for sale. It was introduced as a contaminant in ships’ ballast and as a medicinal herb and has spread along roads, canals, and drainage ditches to degrade wetlands since the early 1800s. Nearly all states and many Canadian provinces have been infested, and it is listed as invasive in Arlington and Alexandria.
Method of removal: Pull up by roots