The soybean sprouts, mung bean sprouts and broad bean sprouts we eat in our daily life are all made by the traditional "sprouting bean sprouts" method. Both artificial germination and "bean sprout machine" germination are carried out in dark environment, and the production is also called complete softening culture. Because the bean sprouts produced are not exposed to sunlight, the whole bean sprouts are milky white and milky yellow. In recent years, vegetable farmers in Shouguang, Shandong Province have used efficient and energy-saving sunlight greenhouse (locally called winter greenhouse), ordinary sunlight greenhouse (locally called spring greenhouse) or plastic greenhouse to produce bean sprouts, creating a new method completely different from the traditional "sprouting bean sprouts". Because bean sprouts grow in weak light (covered with sunshade nets, etc.). ) After bean sprouts are unearthed, they are called "green-petalled bean sprouts" because their cotyledons (watercress) are light green and hypocotyls are milky white, which is different from traditional bean sprouts. This cultivation method is also called semi-softening cultivation in production.

At present, the production of "green-petal bean sprouts" is limited to soybeans, black beans and red soybeans. Its hypocotyl (commonly known as white bud) is longer than ordinary bean sprouts except that the color of cotyledons (watercress) is different from that of traditional bean sprouts. When selling, it can be listed in small bundles or in small packages; Its flavor quality is similar to that of traditional soybean sprouts, but the content of vitamin C is generally high.

Because "green petal bean sprouts" are cultivated in protected fields, the method is simple and convenient, and ordinary vegetable farmers can produce them; Its product is formed by sand culture, which is cleaner than ordinary vegetables, and can be used as a new product of bean sprouts to enrich the sprout market, so "green petal bean sprouts" have been welcomed by producers and consumers.