Vaccinium 'Duke', also known as HIghbush Blueberry, this blueberry plant produces medium to large light blue berries around July and yellow-orange foliage in the fall. Mature plants will produce up to 20 pounds of fruit. For the largest berries and crop yield, use a good organic mulch and cross pollination. Best grown in acidic (pH of 4.8 to 5.2), peaty, organically rich, medium to wet, well-drained soils in full sun to part shade.