'Duke' blueberry may be a late bloomer, but that just means the flowers will miss late frosts, assuring a heavier crop. And as if it wants to make up for the late start, 'Duke' blueberries ripen early in the season, yielding medium to large, mildly flavored berries. At least six hours of sun is a must for best tasting berries, and if you can plant another blueberry variety that blooms at about the same time, the berry production and flavor will be all the better for that. Blueberries are self-pollinating, but the cross pollination results in better yields.