Yam belongs to the Dioscorea plant of the Dioscoreaceae family, which is a perennial climber.It is called domestic yam by growers and wild yam by those who gather it from the wild;In traditional Chinese medicine, it is known as Huai mountain yam, Heshan yam, etc.Due to its rich nutrition, it has been considered a high-quality and affordable tonic since ancient times, suitable for both staple food and vegetables, and can also be made into snacks like yam sticks.Main production areas in China include Bo'ai, Qinyang, Wuzhi, Wenxian, Henan Province, with cultivation also found in Hebei, Shanxi, Shandong, and central-southwest regions.After the stems and leaves wither in winter, it is dug up, the roots are cut off, washed, and dried.The main types of cultivated yam in China include ordinary yams and field yu.Ordinary yams have smaller tubers, with those from Sichuan Province being particularly notable.The "footboard yu" from Shanxi Huai County and the Huaishan yam from Nancheng, Jianghan, are also well-known.The "footboard yu" from Shanxi Huai County and the Huaishan yam from Nancheng, Jianghan, are also well-known.
