They can be borne on the wind great distances from the parent plant. These include vacant lots of the inner city, railroad embankments, highway medians, fence rows and roadsides. It was imported into the United States in 1784 by a Philadelphian gardener. In the western states it was brought over by Chinese immigrants who use it for medicinal purposes. Due to its rapid growth and prolific seed production, it quickly escaped from cultivation.
Seedlings establish a taproot three months from germination.
Thus, they quickly outrace many native plant species in competition for sunlight and space. As these accumulate in the soil, the toxin inhibits the growth of other plants. This toxin is so effective it is currently being studied as a possible source for a natural herbicide. Furthermore, the root system is capable of doing damage to sewers and foundations. It has persisted in certain areas despite cutting, burning and herbiciding.