Duke Highbush Blueberry (Vaccinium corymbosum ‘Duke’)
Duke Highbush Blueberry is an early-season northern highbush noted for heavy crops of firm, light blue berries on an upright, multi-stem plant; late-blooming flowers help dodge spring frosts while fruit ripens early for one of the first harvests of summer.
Distinctive Features
Large, mildly sweet berries with excellent firmness and a small dry scar form in uniform clusters; vigorous, cold-hardy plants carry white spring bells and develop yellow to orange fall color in acidic soils.
Growing Conditions
- Sun Exposure: Full sun for highest yield and sweetness.
- Soil: Moist, well-drained, organic-rich, acidic soil.
- Water: Keep evenly moist, especially from bloom through harvest.
- USDA Hardiness Zones: 4 to 7.
- Mature Size: Typically 4 to 6 ft tall and 3 to 5 ft wide.
- Bloom Time: Spring bloom is relatively late; fruit ripens early season, often early summer.
- Soil pH: 4.5 to 5.5 for best performance.
Ideal Uses
- Focal Point: White spring bloom and bright fall foliage frame patios and entries.
- Edible Hedge: Upright habit forms a productive, seasonal screen.
- Wildlife Support: Flowers feed pollinators; berries attract birds.
- Large Containers: Thrives in acid media with regular feeding and water.
Low Maintenance Care
- Watering: Deeply water when the top 1 in is dry; avoid drought during set and ripening.
- Pruning: In late winter, remove weak wood and oldest canes after year 4 to 5 to renew growth.
- Fertilizing: Feed in early spring with an acid-forming fertilizer; repeat lightly after bloom if needed.
- Mulching: Apply 2 to 4 in of pine bark or needles to conserve moisture and maintain acidity.
- Notes: Self-fertile but heavier crops with a second early or midseason cultivar; net plants to deter birds and avoid alkaline soils to prevent chlorosis.
Why Choose Duke Highbush Blueberry?
- Early Harvest: One of the first highbush blueberries to ripen.
- Firm, High-Quality Fruit: Large berries hold texture for fresh use and baking.
- Cold Hardy: Reliable northern performance with late bloom protection.
- Ornamental Value: Spring bloom and colorful fall foliage enhance gardens.
Plant in full sun with acidic, well-drained soil and steady moisture for abundant, early-season blueberries.
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