Duke Blueberry. Duke' is a late bloomer and early-ripener, producing beatiful pinkish-white flowers in late spring and large, flavorful berries that ripen late-May to early-June. It produces consistently abundant crops and flourishes when paired with other pollinating varieties. This plant will reach 4-6' tall and wide and its extremely large berries have been known to grown as large as a quarter. Their tangy-sweet flavor makes them great for fresh eating, preserves and baking.