Leg Invest SARL:

Sorghum seed will germinate when the soil temperature at the seeding depth is 50 degrees F. Faster germination and superior establishment is obtained when the soil temperature is 60 degrees F., at 8:00 a.m. for more than five consecutive days. Sorghum can be planted in the summer, but grain yields are usually less than a spring planting.

Cowpeas is indigenous to Africa. It is also known as dinawe (Ndebele), dinaba (Shangaan), imbumba (Zulu), monawa or nawa (Pedi) and dinawa (Tswana).
Cowpeas is a protein-rich bean crop that leaves nitrogen in the soil and therefore has a beneficial effect on the follow-up crop.
Cowpeas can be planted as an intercrop or in rotation and can tolerate drought.