UBI (Dioscorea alata L.) or water yam is a vine which produces both aerial tubers called bulbils and underground tubers or roots. The bulbils, weighing a few grams to over a kilogram, come out of the leaf axiles three (3) months after planting. On the other hand, the underground tuber, weighing from one (1) kilogram to six (6) kilograms can be harvested six months after planting.