The Duke blueberry plant blooms late and ripens early, producing many sweet blueberries. Duke blueberries are full of antioxidants, so they are not only delicious but good for your health. The Duke blueberry is a large bush that can grow between 4 and 6 feet high. The plants are hardy through U.S. zones 4 to 7, where low temperatures range between 10 F and -30 F.
Choose a spot for your Duke blueberry plants. They need full sun to partial shade in which to thrive. Duke blueberry plants also need well-drained soil. If your soil has too much clay, add sand to improve drainage.
Test your soil's pH. Duke blueberry plants need acidic soil in which to thrive. The soil's pH should be between 4.0 to 5.0. If your soil is not acidic enough, add sulfur to increase the acidity of your soil. Add about 1 pound of sulfur per 30 square feet.
Plant your Duke blueberry plants in the spring after the last frost.
Dig a shallow hole for your Duke blueberry plants. The hole should be wider than it is deep, about 3 feet in diameter and 1 foot deep. Space the holes about 6 feet apart.
Place the Duke blueberry plants in the holes. Fill the holes with an equal mixture of peat moss, soil and shredded pine mulch. The top of the Duke blueberry plant's root ball should be exposed by about 2 inches.
Apply pine needle mulch on top of the soil mixture to cover up the root ball.