The most widely planted early ripening northern variety. Heavy, consistent yield with an attractive, firm, light blue, high quality berry. Duke blooms late but ripens early which protects the blossoms from spring frosts. Branches may droop to the ground when laden with fruit, and requires the use a simple trellis as support. Fall foliage is orange-yellow blooming in white during the spring. Northern highbush blueberries require 800 to 1000 chill hours to set fruit.
Plant blueberry plants in a sunny to partially shaded area, in a well-drained, very acidic soil, with a pH of 4.2-5.2. Plant at least two different varieties for cross pollination. Set blueberry plants 4-8 feet apart (3 feet apart for hedges).
As fruit ripens, cover blueberry plants with netting to deter birds. Pick fruit promptly to discourage insects.