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Fallopia japonica, commonly known as Japanese knotweed, is a large, herbaceous perennial plant of the family Polygonaceae, native to East Asia in Japan, China and Korea.In North America and Europe the species is very successful and has been classified as an invasive species in several countries.apanese knotweed has a large underground network of roots (rhizomes). To eradicate the plant the roots need to be killed. All above-ground portions of the plant need to be controlled repeatedly for several years in order to weaken and kill the entire patch.
Polygonum cuspidatum, known by the common name Japanese knotweed, is a tall, stout herbaceous perennial (Seiger, 2005) and is a member of the Polygonaceae (Seiger, 2005). In China it is referred to as Hu Zhanz. Japanese knotweed is also known under the scientific names Fallopia japonica and Reynoutria japonica. The leaves are alternately arranged and are oval with pointed tips and a truncate base. They measure approximately 15 cm long by 7.5-10 cm wide (Remaley, 2005).