1. Purple sweet potato is not genetically modified food, but is produced by specific geographical conditions and breeding techniques.

2. In fact, natural plants have various shapes. The same thing, big and small, is colorful. People only see products of one size and one color, just because this variety is widely planted by human beings.

3. Because of its high yield and wide adaptability, sweet potato is planted in many parts of the country. It is called sweet potato in Beijing and Tianjin, sweet potato in Shandong, sweet potato in Northeast China, sweet potato in Henan and Hunan, sweet potato in Anhui, sweet potato in Jiangsu and Zhejiang, sweet potato in Fujian and sweet potato in Sichuan.