This is a perennial herb with a woody, square stem. Leaves are arranged in whorls. They are lance shaped, stalk less and heart shaped or rounded at the base. The plant can grow from 4-10 feet along roadsides and in wetlands. They produce magenta colored flower spikes with 5-7 petals.
Concern: With the right conditions, they can rapidly establish and replace native vegetation. This can lead to a reduction in plant diversity which can have a negative effect on wildlife.