According to the community inquiry of bamboo slips, the word "sunflower" in Sichuan dialect refers to winter amaranth, which is a cool vegetable in winter. It is a herb of Malvaceae. Its tender buds and leaves are edible, with smooth taste and rich nutrition. This kind of plant likes cold and humid climate, and is not resistant to high temperature and cold, but it is resistant to low temperature and light frost, and low temperature can improve its quality. The suitable temperature for plant growth is 15 ~ 20℃. It is widely cultivated in Hunan, Sichuan, Guizhou, Yunnan and other places in China, and a small amount is also cultivated in South China.