I planted 3 seedlings, they completely took over the whole yard and some of the alley, but somehow did not kill the tomato plants. Sweet potato vines are attractive with cute little purple flowers. Harvesting reveals a crazy looking nerve center of roots and tentacles. It is difficult to tell where the root ends and the potato begins. After harvest, you have to let the spuds sit on top of the ground for several days so they can "cure," meaning they need to develop a tougher skin and sweetness, neither of which they have right after you dig them up.