Black Walnut (Juglans nigra)

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Plant Details

Category: Nursery
Light: Full Sun
Bloom Season: Spring
Height: 50-75' / 
15.2-22.9m
Space: 60-70' / 
18.3-21.3m
Zones: 5, 6, 7, 8, 9
Lowest Temp: -20° to -10°F / 
-29° to -23°C
Colors: Grown for Fruit

Basic Care

Plant in a reliably sunny spot. When planting, keep the base of the trunk exposed. Best in fertile, humus-rich, well-drained soil. Water regularly until established.

Water

Water regularly until established.

Soil

Fertile, humus-rich, well-drained soil.

Feed

Slow release feed in spring.

Black Walnut detailed care guide →
plants that grow upright

Grows Upright

Slow Growth

Ornamental Foliage

Fruit

Features

The majestic black walnut tree develops delicious edible nuts, encased by a round fruit. It may take 4-6 years for the tree to produce nuts but it’s worth the wait since they are excellent for use in any recipe that calls for walnuts. The lustrous, dark green leaves are fragrant when crushed. Chemicals produced by the roots can inhibit growth of some other plants.

Young black walnut trees may take 4 to 7 years to become productive. The nuts will fall to the ground as they mature, typically between September and October. You’ll need to remove the nuts from their outer husks. Since the husks are high in tannins that can cause staining, you may want to wear gloves during this process. Also, it is best to dispose of husks in the trash since they are high in juglones. You don’t want to contaminate your compost pile with this plant inhibitor.

Uses

A classic favorite for landscape focal points. Provides shade and large-scale beauty to landscapes. Makes a breathtaking specimen plant.

Black Walnut (Juglans nigra) Care Guide

Plant in spring or early fall to give plants the best start.

Choose a location that will allow roots to spread and branches to grow freely. Space plants far enough from building foundations, walls, and decks so that the growing foliage won’t crowd the structure. Consider whether tall trees or shrubs will block windows or interfere with the roof or power lines.

To prepare the planting area dig a hole as deep as the root ball and three times as wide. After removing the soil, mix it with some compost or peat moss. This enriches the soil and loosens the existing dirt so that new roots can spread easily.

To remove the plant from the container, gently brace the base of the plant, tip it sideways and tap the outside of the pot to loosen. Rotate the container and continue to tap, loosening the soil until the plant pulls smoothly from the pot. The container can also be removed by carefully cutting it down the side.

Set the plant in the hole. If the root ball is wrapped in burlap fabric this must now be removed along with any string or wire securing the burlap. If roots are tightly packed gently rake them apart with your fingers.

Return the soil to the planting area packing it firmly around the root ball. Fill the hole until the soil line is just at the base of the plant, where the roots begin to flare out from the main stem.

Water the plant well then add a 2” (5cm) layer of mulch, such as shredded bark, around the planting area. Keep the mulch at least 4” (10cm) away from the trunk of the plant as this can keep the bark too moist and cause it to decay.

Depending on rainfall, new plants need to be watered weekly through the first growing season. A slow, one-hour trickle of water should do the job. During hot spells thoroughly soaking the ground up to 8” (20 cm) every few days is better than watering a little bit daily. Deep watering encourages roots to grow further into the ground resulting in a sturdier plant with more drought tolerance.

To check for soil moisture use your finger or a hand trowel to dig a small hole and examine the soil. If the first 2-4” (5-10cm) of soil is dry, it is time to water.

Monitor new plants through the first two years to make sure they are getting the moisture they need. After that they should be sturdy enough to survive on their own.

Pruning may be needed to remove dead branches, encourage bushier growth, promote more flowers, or maintain a specific size or shape.

Dead branches should be removed close to the trunk, flush with the bark. When pruning to control a plant’s size or shape, cuts should be made just above a leaf bud and at a slight angle. This bud will be where the new growth sprouts.

Many shrubs can be regularly sheared to keep them shaped as a hedge, edging or formal foundation planting.

Always use sharp, clean tools when pruning. There are many tools available depending on the job. Hand shears, pruners, and loppers are ideal for most shrubs. Pole pruners and tree saws are better for large, mature shrubs or trees. If a tree is so large that it can’t be safely pruned with a pole pruner, it is best to call in a professional tree service.

Established trees should be fertilized every 2-3 years. Feed in early spring when plants start growing.

Fertilizers are available in many forms: granulated, slow-release, liquid feeds, organic or synthetic. Determine which application method is best for the situation and select a product designed for trees and shrubs, or go with a nutritionally balanced, general-purpose formula such as 10-10-10.

Always follow the fertilizer package directions for application rates and scheduling. Over-fertilizing plants or applying at the wrong time during the growing season can result in plant injury.

Black Walnut Companion/Combination Plants

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