Sweet Potatoes grow under the ground just like regular potatoes. Above ground, Sweet Potatoes are sprawling vines that can take up a lot of room in the garden. Unlike regular potatoes, Sweet Potatoes are a warm-weather crop and need about 4 months of high temperatures to mature. However, if you live in a northern climate, you can still grow them through proper propagation and maintenance. Choose a warm site in full sun, and someplace where sweet potatoes have not grown recently. Make sure the soil has good drainage. The best soil for sweet potatoes is a light, sandy soil. It should be slightly acidic, and have a good supply of phosphorus and potassium in the soil. Keep reading the tutorial in the source.