I've read about a couple of ways to sprout slips from sweet potatos. The method we picked was to cut the sweet potato in half, used toothpicks to hold the potato such that the bottom 1/4 or so was immersed in water. We've been waiting now for a couple of weeks - nothing happening. Has anybody else tried this? How long does it usually take before eyes sprout slips? I also read you could cut the sweet potato in half length-wise, plant in sterile potting mix (seed starting mix) and it would sprout slips that way. Any help would be most appreciated. Thanks!