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How to Grow Viscount Blueberry

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Viscount Blueberry

Vaccinium corymbosum 'Viscount'

shrub

Viscount is a highbush blueberry cultivar bred specifically for northern climates, known for its cold hardiness and early ripening fruit. It produces medium-sized, sweet blueberries and is a compact, deciduous shrub that offers ornamental value with attractive spring flowers and fall foliage color.

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Example Viscount Blueberry timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Viscount Blueberry

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Viscount Blueberry

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Viscount Blueberry dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily (minimum 6 hours for optimal fruiting)
💧
Water: Consistent moisture, 1-2 inches per week; avoid waterlogging. Mulch heavily to retain soil moisture and maintain cool root zone.
📏
Spacing: 48 inches
📅
Days to maturity: 2-3 years to significant production, 3-4 years to full maturity
🌱
Planting depth: Same depth as root ball; do not bury crown

Soil

Type: Well-draining, acidic sandy loam or peat-based soil
pH: 4.5-5.5
Amendments:
Peat moss or sulfur to lower pH if needed Pine bark mulch Compost for organic matter Avoid lime or alkaline amendments

Growing Zones

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Thrives in zones 3-7, with exceptional cold hardiness down to -35°F (-37°C)

3a 3b 4a 4b 5a 5b 6a 6b 7a 7b

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Growth Stages

1

Establishment

Year 1

Young shrub develops root system and initial branch structure. Leaves emerge bright green in spring.

Water regularly, mulch heavily, pinch off flowers the first 1-2 years to encourage vegetative growth. Remove any damaged canes.

2

Vegetative Growth

Years 1-3

Shrub grows taller and wider, developing a dense canopy. Annual growth of 12-18 inches expected.

Maintain consistent watering, apply acidifying mulch annually, prune lightly to shape. Continue removing early flowers.

3

Flowering

2-3 weeks in spring

Delicate clusters of small, bell-shaped white or pale pink flowers appear in spring (April-May).

Flowers appear on previous year's wood; avoid pruning during flowering. Cross-pollination with another highbush variety improves fruit set.

4

Fruiting

4-6 weeks

Flowers develop into clusters of hard green berries that gradually grow and ripen to blue-purple (early season, June-July).

Ensure adequate water during fruit development. Birds may need netting to protect crop. Thin heavily laden branches if needed.

5

Dormancy & Pruning

November-March

Leaves turn brilliant red and burgundy in fall before dropping. Canes become visible, revealing woody structure.

Prune in late winter/early spring (February-March) to remove dead wood, crossing canes, and low branches. Thin interior to improve air circulation.

Companion Planting

Plan your garden →

Plant with:

Rhododendron Azalea Boxwood Bearberry Sheep laurel Cranberry Lingonberry Other highbush blueberry varieties (for cross-pollination)

Avoid planting near:

Alkaline-loving plants (lilac, clematis) Shallow-rooted plants competing for water (maple, birch) Walnut trees (allelopathic toxins)

Common Pests

  • Yellow sticky traps in summer, sanitation of fallen fruit, spinosad sprays in late June-July

  • Remove and destroy infested canes, maintain plant vigor, avoid wounding branches

  • Hand-pick in early morning, use pheromone traps away from plants, neem oil sprays

  • Ensure excellent drainage, avoid overwatering, apply fungicide drench if needed, improve soil aeration

  • Remove infected berries and mummified fruit, prune for air circulation, sulfur fungicide in spring

  • Netting over plants during fruit ripening, reflective tape, predator decoys

Uses

🍳

Fresh eating and baking

Culinary

Viscount blueberries are excellent for fresh consumption, high-quality for pies, muffins, and jams due to their sweet flavor and early season availability. [source]

💊

Antioxidant-rich food

Medicinal

Blueberries are rich in anthocyanins and other polyphenols with potential cognitive and cardiovascular health benefits. [source]

🌿

Landscape and hedging

Ornamental

The compact growth habit, white spring flowers, and vibrant red-burgundy fall foliage make Viscount attractive as a specimen shrub, foundation planting, or informal hedge. [source]

🦋

Native pollinator and bird support

Wildlife

Flowers attract bees and other pollinators; ripening fruit provides an important food source for songbirds and wildlife. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Berries are ripe when fully blue and firm to the touch (late June-early July). Pick by gently rolling berries in your palm—ripe ones release easily. Harvest every 2-3 days during peak season. Refrigerate unwashed berries in shallow containers; they keep 2-3 weeks.

Fun Facts

  • 🌱 Viscount was bred at the University of Guelph in Ontario, Canada, and is sometimes called 'Guelph' in breeding databases—it was specifically developed to survive harsh northern winters.
  • 🌱 Blueberries have the highest antioxidant content of any common fruit, and Viscount's early ripening (mid-June in northern zones) means fresh, peak-nutrition berries before mid-summer.
  • 🌱 A mature Viscount blueberry can produce 5-10 pounds of fruit per year, and the shrub can remain productive for 30-40+ years with proper care.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Annual Cultivar Full Sun Mulch Pollination
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