He'd dig out an area about 1' deep, in the ground lay down 2" of straw and cover it with 4" of fresh horse manure topped by about 3" of loose and leveled sandy soil.
Picking out some of his best sweet potatoes from the previous year's crop he'd lay them on this bed, topped with another 3" to 4" of very sandy soil, and water them.
Then lay some burlap bags over them until they started sprouting.
Into mounds of soil that he had prepared and made up especially for them .
The long awaited moment of Harvesting of the sweet potatoes would began as soon as they reached a usable size about three months later.
Dad would always Harvest a few of the tubers first to see if they were large enough, before digging the entire patch.