Yam requires fertile, well-drained sandy soil, and likes warm and sunny places, but it is afraid of frost and avoids continuous cropping.
Purple yam, also known as "Purple Ginseng", also known as Dioscorea opposita and Dioscorea opposita, belongs to Dioscoreaceae and is eaten with its fat tuberous roots or cylindrical roots. The root tuber contains protein 65438 0.5%, carbohydrate 65438 0.4%, and contains many vitamins and choline. The nutritional value is very high. Protein content and starch content of purple yam are high. Eating purple yam regularly is beneficial to skin moisturizing and can also promote cell metabolism. This is a table delicacy.
The main producing areas are Lushan County, Ya 'an, Sichuan, Jintian Town, Guiping, Guangxi, Gannan, Guangdong, Taiwan Province and Fujian. Hakka people are regarded as the treasure of health preservation, and they are frequently used as raw materials in Hakka snacks.