Native to the United States as a wildflower, and found throughout most of the eastern half of the U.S. This is a threatened or protected species of plant in several northeastern states.
An annual, biennial, or sometimes perennial wildflower with an upright growth habit. It may be found commonly along roadsides in damp situations. Propagation is from seeds.
Mature plants are tall and thin, growing up to 2 feet tall with usually a single straight stem. Leaves are opposite, with the lower leaves more blunt or shovel shaped, while upper leaves are more elongate, with rounded tips. Flowers are white, violet, to blue-violet, alternate or opposite along the upper stem, with 5 open petals. The sepals are elongate and enclosed to form a tube that attaches to the stem.
There is no need to control this wildflower.