How to Grow Walnut

Walnut

Juglans regia

tree

The walnut is a large, long-lived deciduous tree prized for its nutrient-rich nuts and valuable hardwood. It typically grows 40-60 feet tall and can live for over 100 years, producing abundant nut crops once mature. Walnut trees have compound leaves, deep root systems, and produce a natural herbicide that inhibits nearby plant growth.

Looking for a specific variety?

Carpathian Chandler Franquette Hartley Payne Tulare

Growing Conditions

☀️

Sun: Full sun, minimum 6-8 hours daily, preferably 8+ hours

💧

Water: Moderate watering when establishing; once mature, walnuts are drought-tolerant but produce better yields with consistent moisture during growing season. Water deeply 1-2 times per week during dry periods.

📏

Spacing: 400-600 inches (33-50 feet apart) inches

📅

Days to maturity: 5-10 years to first production; 10-15 years to commercial productivity

🌱

Planting depth: Plant seedlings or grafted trees at same depth as root ball; bury fresh nuts 1-2 inches deep in fall for stratification

Soil

Type: Well-draining loamy or silty soil

pH: 6.0-7.5

Amendments:

Compost Aged manure Lime if pH is below 6.0 Mulch layer to retain moisture

Growing Zones

Find your zone →

Zones 5-9, with best production in zones 6-8

5a 5b 6a 6b 7a 7b 8a 8b 9a

Growth Stages

Seedling

1-2 years

Young tree with developing stem and compound leaves (7-9 leaflets per leaf); root system establishing.

Protect from deer and rabbits; provide staking in windy locations; mulch around base; consistent watering critical. Remove competing weeds.

Juvenile/Vegetative

3-5 years

Tree grows rapidly, developing branch structure; no flowering yet. Crown expands and tree reaches 15-20 feet.

Light pruning to establish strong scaffold branches; continue regular watering; remove lower branches if desired; fertilize lightly with balanced NPK.

Flowering/Early Production

1-3 weeks flowering; fruit develops over 5-6 months

Male catkins appear in spring; female flowers develop into small green fruit with outer hulls. Light nut production begins.

Male and female flowers on same tree (monoecious), but cross-pollination improves yields. Do not prune during flowering. Monitor for pests.

Nut Development

May-September (4-5 months)

Green walnut hulls expand; inner shell hardens. Nuts reach full size by mid-summer; hulls begin darkening in fall.

Maintain consistent moisture for optimal nut size; thin crowded fruit if desired; watch for hull rot in wet conditions; apply fungicides if disease pressure is high.

Maturity/Harvest

September-November; storage indefinite

Hulls darken and split; nuts drop naturally when fully mature. Tree enters dormancy after leaf drop.

Harvest fallen nuts promptly; remove hulls within 24 hours to prevent staining and mold; dry nuts in well-ventilated area; store in cool, dry conditions.

Companion Planting

Plan your garden →

Plant with:

Clover Grass cover crops Nitrogen-fixing legumes (at distance) Grapevines at tree edges Shade-tolerant understory plants

Avoid planting near:

Tomatoes Peppers Potatoes Eggplants Apples Pines Rhododendrons Azaleas Alfalfa Cabbage family plants

Common Pests

Sanitation of fallen fruit; netting in severe cases; entomopathogenic nematodes in soil; bagging developing fruit clusters
Hand-pick egg masses on shoots; Bt (Bacillus thuringiensis) spray when caterpillars are young; encourage natural predators
Pheromone traps; bagging nuts; removal of mummified fruit; pruning to open canopy for air circulation
Resistant varieties; copper fungicide sprays in spring; pruning infected branches; improve air circulation
Prevention through native walnut protection; remove infected trees; do not transport firewood; no cure available

Uses

🍳

Nutmeat for cooking and baking

Culinary

Walnut kernels are rich in omega-3 fatty acids and widely used in baking, salads, pestos, and as snack foods. They have a rich, slightly earthy flavor that complements both sweet and savory dishes. [source]

💊

Heart and cholesterol health

Medicinal

Walnuts contain polyphenols and ALA (alpha-linolenic acid) that support cardiovascular health and have anti-inflammatory properties. Regular consumption is associated with improved cholesterol profiles and reduced cardiovascular risk. [source]

🏠

Wood for fine furniture and veneer

Household

Black walnut and English walnut wood is highly prized for furniture, cabinetry, gunstocks, and decorative veneer due to its rich color, grain pattern, and workability. [source]

🏠

Natural dye and ink

Household

Walnut hulls and leaves produce a rich brown dye used historically for textiles and wood staining. The tannins in hulls also yield a dark ink-like substance. [source]

🏠

Juglone—natural herbicide

Household

Walnut trees produce juglone, a natural compound that inhibits growth of many plants nearby, which gardeners can use strategically in landscape planning or to reduce weeds. [source]

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

Harvest Tips

Walnuts mature when hulls split naturally and nuts fall to the ground, typically September through November. Harvest promptly after falling to prevent hull rot and mold. Remove outer green hull within 24 hours by rubbing against concrete or using a mechanical huller—wear gloves as juice stains skin and fabric. Dry nuts in a well-ventilated location (garage, shed) for 2-4 weeks until shell is completely hard and kernel moisture is reduced to 8-10%. Store in cool (50-60°F), dry conditions; in-shell nuts keep 2+ years, shelled kernels 4-6 months in refrigerator.

Fun Facts

🌱 A mature walnut tree can produce 40-60 pounds of nuts per year, with some specimens yielding over 100 pounds; a single tree can remain productive for 100+ years and be passed down through generations.
🌱 Walnuts are one of the oldest tree foods known to humans, with evidence of walnut consumption dating back to 7000 BCE; they were also valued as currency and gifts in ancient trade.
🌱 The outer green hull of walnuts contains juglone, a natural chemical that stains skin and clothing dark brown and was historically used to make dye, leather treatments, and even hair color.

Want personalized planting timelines?

Get started free