Walnut Tree

Juglans regia

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A large, stately deciduous tree native to Central Asia, highly valued for its large, nutritious nuts and durable hardwood. Walnut trees are long-lived (100+ years), reaching 40–60 feet at maturity, and produce fragrant catkins in spring. They require considerable space, as they produce allelopathic compounds that inhibit growth of nearby plants.

Common Problems

Select the problem your Walnut Tree is experiencing to get a treatment guide.

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Brown Spotschevron_right

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Dropping Leaveschevron_right

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Slow Growthchevron_right

Care Guide

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Light

Full sun (8+ hours daily) for vigorous growth and optimal nut production.

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Water

Moderate to deep watering during the first 2–3 years to establish roots. Once mature, fairly drought-tolerant. Avoid waterlogging; ensure well-draining soil.

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Soil

Deep, well-draining loam or sandy loam with pH 6.0–7.5. Walnuts prefer fertile soil. Poor drainage leads to poor growth and disease. Mulch young trees to conserve moisture.

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Fertiliser

Minimal fertilization needed if soil is fertile. Apply balanced fertilizer in early spring if growth slows. Avoid excessive nitrogen.

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Temperature

Hardy in temperate zones; requires cold winters (800+ chilling hours) for proper dormancy. Thrives in USDA zones 5–9.

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Humidity

Moderate humidity. Good air circulation is beneficial. Walnut trees are generally disease-resistant but benefit from open, unobstructed canopies.

Toxicity

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Nut meats are safe for humans. Hulls, leaves, and roots contain juglone, a toxic compound harmful to many plants and potentially toxic to dogs if ingested in quantity.

Common Diseases

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Common Pests

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Seasonal Care

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Resume regular watering and feeding as growth picks up.

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Peak growing season. Water and feed regularly.

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Reduce watering as growth slows. Stop heavy feeding.

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Minimal watering and feeding. Protect from frost if needed.