Mirabilis expansa (mauka or chago) is a species of flowering plant cultivated as a root vegetable in the Andes, at cold, windy altitudes between 2,200 m (7,200 ft) and 3,500 m (11,500 ft). The above-ground portion dies back with frost, but the root is quite hardy. The roots can reach the size of a man's forearm, and yields can reach 50,000 kg/ha (45,000 lb/acre) given two years maturation time.