DULUTH, MN (KDAL) - The City of Duluth is holding an educational workshop Thursday on how to remove the Japanese Knotweed, an invasive species commonly known as bamboo. The plant was brought from Asia in the 1800's and grows rapidly in dense clusters. The bamboo competes with native vegetation and greatly alters natural ecosystems. Once established, the bamboo patches are very difficult to control and grow several inches a day and reach heights of ten feet or more in a year. The workshop on Thursday will be held at the Irving Community Center at 57th Avenue West and Main Street from 5:30 to 7 p-m.