1、 What is it

1. Form: yam is a kind of plant that can be used as both food and medicine. It is very common in life. It belongs to the dry rhizome of Dioscorea, which is cylindrical in shape, generally straight and slightly curved. The outer skin is yellowish white or light yellow, with longitudinal grooves and some fibrous roots, with a length of about 15-30cm and a diameter of about 1.5-6cm. The texture is relatively solid and heavy. It is white inside. The taste is relatively light, slightly sour and sticky

2. Origin: its main producing areas are Hebei, Henan and Guangxi, and the rest are also cultivated in Zhejiang, Hunan, Sichuan, Shandong, Guizhou, Shanxi, Shaanxi and other places

3. Habits: it likes to grow in warm places and sufficient sunshine. It requires fertile and loose soil and good drainage. It is afraid of cold climate in winter and can't stand frost

2、 There are several

Yam is mainly divided into two species, one is common yam, the other is field potato, and there are five varieties. The subdivided varieties mainly include hemp yam, iron stick yam, water yam, xiaobaizui yam, fine wool yam, etc. these varieties are more common