After 2 years of failing, we are able to grow sweet potatoes in our garden. I grew the slip directly from a store bought sweet potato (read here and here) and used 6 mil clear plastic film to cover the soil for the entire season. Although most of the tubers are small, I count it as a success because the bed has only 5 inches of soil and the slips were close. Sweet potatoes are nutritious and hard to grow in warm climate countries. They do not need fur tile soil and can withstand drought. It is a wonderful gift from God, same with everything else.