What are the characteristics of purple potato?

Purple potato is also called black potato, and its meat is purple to deep purple. Besides the nutrients of common sweet potato, it is also rich in selenium and anthocyanins. Purple sweet potato is one of the main raw materials of anthocyanin. Purple sweet potato likes warm climate. The suitable growth temperature of stems and leaves is 18 ~ 25℃, and the growth stops below 15℃. The optimum ground temperature for the growth of tuberous roots is 22 ~ 24℃, and when the ground temperature is lower than 20℃, the tuberous roots stop expanding. A winding vine; Wild tubers are mostly cylindrical or rod-shaped, and the cultivated morphology changes greatly, such as palm, rod or cone, with brown or black surface and white, yellow or purple cross section.