Giant Knotweed P.E.
Polygonum cuspidatum Sieb. et Zucc.. ), also known as acid barrel rod, acid barrel reed, large elder, and Banzhuang root. Perennial herb with stout rhizomes and horizontal walks. The stems stand erect not only for ornamentation, but also for food. It is produced in southern Shaanxi, southern Gansu, eastern China, central China, southern China, Sichuan, Yunnan and Guizhou, and also in Korea and Japan. It is found in hillside shrubland, valleys, roadsides, and fieldside wetlands. Dig in spring and autumn, remove the beard roots, wash them, cut short or thick slices fresh, and dry them in the sun.