Walnut Fruit

Juglans regia

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verifiedReviewed by the GreenScout Team

English walnut trees produce large, round nuts with hard shells containing nutrient-rich kernels. These tall, deciduous shade trees secrete juglone, a compound that inhibits growth of many nearby plants. Walnuts require a long growing season and are productive in regions with warm, frost-free springs.

Common Problems

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

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Slow Growthchevron_right

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Brown Spotschevron_right

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Dropping Leaveschevron_right

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Underwateringchevron_right

Care Guide

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Light

Full sun; requires 6–8 hours of direct sunlight daily for optimal nut production

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Water

Moderate; water regularly during establishment and growing season. Mature trees are drought-tolerant; reduce watering in winter

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Soil

Deep, well-draining loam or silt loam; pH 6.0–7.5. Needs room for deep root development

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Fertiliser

Light feeding in early spring with balanced fertilizer. Excessive nitrogen reduces nut quality and shell thickness

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Temperature

Prefers warm, long growing seasons. Frost-sensitive during spring; late frosts damage flowers and developing fruit

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Humidity

Moderate; prefers slightly moist but well-drained conditions. High humidity increases fungal disease risk

Toxicity

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Walnut kernels are edible and non-toxic. However, the hull stains skin and clothes; juglone in leaves and roots can be toxic to sensitive plants nearby

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.

Frequently Asked Questions

Why won't anything grow well near my Walnut tree?

Walnut trees secrete juglone, a compound that inhibits the growth of many nearby plants, so struggling plants underneath or close to the canopy may simply be sensitive to this natural chemical.

Why did my Walnut tree's flowers get damaged this spring?

Walnuts are frost-sensitive during spring, and late frosts can damage flowers and developing fruit — site selection away from frost pockets helps protect the crop.