Polygonum cuspidatum
Japanese Knotweed
This plant is native to Eastern Japan, China and Korea. In the United States it is considered an invasive species as it is in most other countries. It is considered one of the worst invasive species in the world. The plant grows rapidly and displaces native species quickly with its large size and is difficult to eradicate due to the way it is able to propagate through its root system. Luckily the plant has some redeeming qualities, which should make it very desirable to harvest. It is known as a rich source of the antioxidant Resveratrol.