 The planting of the mounds is done so that the plants which have a higher frost tolerance, such as the Irish potatoes, are planted casually throughout the mound and the low tolerant sweet potatoes are planted in the best position to avoid the frost.Peas, beans, and cabbage which are all highly tolerant to frost will be planted outside the circle of sweet potatoes and lower on the mound placing them closer to the cold temperatures of the ground (Dove and Carpenter 2008).The Enga practice fallow rotation where a garden will in crop for about four years followed by about four years of fallow grassland to let the soil replenish (Wohlt 2004).