Has there always been cowpea in the north?

Cowpea has always been in the north. Beans, also known as cowpeas, are widely planted in the north and have a long harvest period. It can be planted in spring, summer and autumn, and also in greenhouses in winter.

Cowpea can only be planted in spring, summer and autumn, from March to September. For the northern region, cowpea can be planted after all the harvest, while the time for planting cowpea in the southern region can be advanced to March.