Originally from Brazil, it is cultivated in many areas of China, especially in the south. It has the advantages of easy cultivation, few pests and diseases, high nutrition, good taste and rich in Va and Vc, and has the functions of nourishing, strengthening waist and knees, resolving phlegm, promoting blood circulation, invigorating stomach and protecting liver.

The small pimple on the root is a bead bud, which can replenish liver and kidney, nourish, strengthen waist and knees, reduce swelling and resolve phlegm when used as medicine.