Kojyokon

Chinese: hu zhang

English: Japanese knotweed

Pharmaceutical: Polygoni cuspidati Rhizoma

Properties: Bitter, cold

Standard Species: Polygonum cuspidatum Sieb. et Zucc., Reynoutria japonica Houtt. var. japonica

Japanese Knotweed

Japanese Knotweed (Polygonum cuspidatum) - Hamilton, Canada (Photo by TH Tanaka)

Japanese Knotweed Year old

Japanese Knotweed (Polygonum cuspidatum) - Hamilton, Canada (Photo by TH Tanaka)

Reynoutria sachalinensis - Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, Japan (Photo by TH. Tanaka)