Polygonum cuspidatum is a large, herbaceous perennial plant of the knotweed and buckwheat family Polygonaceae. This plant is native to China, Japan, and Korea. Hu Zhang, that medicinally mainly refers to the dried rhizomes and roots of Polygonum cuspidatum, has a variety of different names, such as Bushy Knotweed Root, Rhizoma Polygoni Cuspidati, Knotweed Rhizome, Fallopia Japonica, Giant Knotweed, Japanese Bamboo, Japanese Knotwood, Mexican Bamboo, Reynoutria Japonica, Japanese Fleece flower and so on. Best harvesting seasons are spring and autumn. After the digging, remove fibrous roots, wash clean, chop into segments or thick slices when it is fresh, dry in the sun, and used raw or fresh.Proudly made in the USA in an FDA registered facility under srtict laboratory control. We produce our liquid extracts using ONLY natural ingredients! All herbs are organically grown, ethically wild harvested, or selectively imported. Our glycerites do not contain alcohol, GMO, gluten, artificial colors, heavy metals, preservatives, pesticides or fertilizers!. Super concentrated Hu Zhang glycerite: dry plant material menstruum ratio is 1:3! Extraction rate: 1 ml of glycerite is equal to 330 mg of Dried Root!. Expertly extracted under strict quality standards and procedures from Hu Zhang Dried Root. We meticulously produce our extracts according to precise standards where each herb is extracted according to the distinct characteristic of each plant!. We made this Hu Zhang liquid extract using ONLY natural ingredients! This extract does not contain Alcohol, GMO, gluten, artificial colors, heavy metals, preservatives, pesticides or fertilizers!.