Well, I put my sweet potatoe into the water, and it sprouted, I took off a couple of the longer sprouts and put them in water, and in two days they were starting to root! I'm so excited. It was just too easy. This was a Centenial that I saved from last year's crop. I have ordered some anyway, not knowing if this would work, so I should have lots of sweet potatoes this fall. Now if they live when I trasplant them is the next hurdle, but I'm thinking they are pretty hardy. I'm guessing I'll need to harden them off, as they are pretty pale being in the house.