Tubers

Tubers are high in carbohydrates and are great sources of energy. You can eat them in diverse forms. You can boil, bake, or mash them. A common type of tuber is potato. Tubers grow downwards and anchor the plant into the ground. 

In the ground, they absorb nutrients used during the drier months or in winter. Other examples of tubers include Ube or purple yam, Lotus root, Yam bean root, etc.