1, Jiang Dou and cowpea are the same bean product, just because they have different names in different regions. In ancient China, cowpea was called Jiang Dou. Later, this name has been used in some areas. In addition, cowpea is also called ginger bean, eighteen bean and pulp bean.

2. Jiang Dou belongs to Leguminosae and is an annual cultivated plant. According to legend, this plant is native to India and the Middle East, but it has been cultivated in China for a long time. The appearance of Jiang Dou is characterized by three compound leaves and leaflets with white, purple or yellowish flowers.

There are many varieties of edamame, but most of them are eaten as vegetables. Cowpea can be divided into white skin, green skin, flower skin and red skin according to different skin colors. Different varieties of cowpea have different responses to day-length. For example, cowpea with red mouth is not sensitive to day-length, while cowpea in Shanghai and Yangzhou is sensitive to day-length.