(Dioscorea batatas) Cinnamon scented flowers and heart shaped leaves adorn this vigorous deciduous vine. In the mountains of northern China it produces large, highly prized, white fleshed tubers with a nutty potato flavor. They must be cooked before eating, and handling the raw tubers can produce irritation of the skin in some people. While the top dies back each November the tubers can be left in the ground for several years to keep growing. One gallon pot.