紫背天葵为菊科土三七，属多年生草本植物。原产我国南部地区，以嫩稍和嫩叶供食，并具有很高的营养保健作用，其生长中尚未发现病虫害，属无公害蔬菜。　　1.育苗 紫背天葵的茎节部易生不定根，目前多采用扦插繁殖育苗。春季从健壮的母株上剪取 6厘米～ 8厘米的顶芽，若顶芽很 Purple back sky Kwai Chrysanthemum soil thirty-seven, is a perennial herb. Originally southern China, with tender and tender leaves for food, and has a high nutritional role, its growth has not yet found pests and diseases, is a pollution-free vegetables. 1. nursery purple sunflower stem section prone to adventitious roots, the current use of cutting propagation nursery. Spring from the robust parent plant cut 6 cm ~ 8 cm of the top bud, if the top bud is very