My wife and I love eating sweet potatoes, so last year, my wife and I attempted to grow them. We bought a few sweet potatoes from the grocery store and placed them halfway immersed in a glass of water like we were told to do. They never sprouted. We then tried to put them in moist soil. again, all we got were rotten potatoes. Thinking that the supermarket potatoes were too GMO'ed or processed, we bought some at a produce stand on the way to the beach in eastern North Carolina....again, no luck. What are we doing wrong? Where do we need to get sweet potatos that will actually sprout, or are we just going about this all wrong and need to start the sweet potatoes another way?