Purple potatoes can eat 150 grams a day, that is, one to two, purple potatoes contain selenium and purple pigment than ordinary sweet potatoes several times higher, containing protein, vitamins, phosphorus, iron, calcium and other more than 10 kinds of trace elements, purple potatoes, also known as the black potatoes, the flesh of the potatoes is purple to dark purple. In addition to the nutrients of ordinary sweet potatoes, it is also rich in selenium and anthocyanins, purple potatoes for one of the main raw materials of anthocyanins.

Purple potatoes like warm climate environment, stem and leaves suitable growth temperature of 18 ~ 25 ℃, the temperature is lower than 15 ℃ stop growing. Root optimal growth ground temperature of 22 ~ 24 ℃, ground temperature below 20 ℃ stop expanding. Twining vine; tuber wild mostly cylindrical or rod-shaped, cultivated shape varies greatly, palmate, rod-shaped or conical, surface brown or black, section white, yellow or purple.