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Juglans nigra (Black walnut)

Other names: American walnut

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Species
J. nigra is a large deciduous tree with large oblong leaflets, catkins and green fruits housing edible black nuts.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
40 m 40 m 20-50 years
131 ft 131 ft 20-50 years

Where to grow

Soil type
  • Chalky
  • Clay
  • Loamy
  • Sandy
Soil drainage
  • Moist but well-drained
  • Well-drained
Soil pH
  • Acid
  • Alkaline
  • Neutral
Sunlight
  • Full Sun
Aspect
  • East
  • West
  • South
  • North
Exposure
  • Exposed
  • Sheltered

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Additional plant details

Cultivation

Black Walnut is more resistant to frost than the English Walnut, but thrives best in the warmer regions of fertile, lowland soils with a high water table.

Suggested uses

Low Maintenance, Woodland, Foliage only

UK hardiness

H6

USDA zones

Sunset zone

1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21

WUCOLS

North-Central Coastal = Moderate/Medium
Central Valley = Moderate/Medium
South Coastal = Moderate/Medium
South Inland = Inappropriate
High and Intermediate Desert = Inappropriate
Low Desert = Inappropriate

Foliage

Deciduous

Native to

Eastern North America, Central United States

Drought tolerant

No

Flood tolerant

No

Fragrance

The leaves are aromatic when bruised.

Toxicity

The roots, nut husks, and leaves secrete a substance into the soil called juglone that is a respiratory inhibitor to some plants.

Plant care

Pruning

Propagation methods

Seed, Grafting

Pests

Aphids

Walnut blister mites

Diseases

Coral spot

Leaf spot

Selective pruning only (only if needed)

Rake up and use fallen leaves to make leafmould

Propagate from grafting in winter (advanced)

Sow seed in containers in cold frame (anytime)

Other plants

Plants in this Genus (8)

Juglans

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Juglans regia 'Mayette'
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Juglans regia 'Mayette' Common walnut 'Mayette'
Juglans regia 'Broadview'
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Juglans regia 'Broadview' Common walnut 'Broadview'
Juglans nigra
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Juglans nigra Black walnut
Juglans regia
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Juglans regia Common walnut
Juglans cinerea
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Juglans cinerea Butternut
Juglans mandshurica
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Juglans mandshurica Manchurian walnut
Juglans californica
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Juglans californica California black walnut
Juglans ailantifolia var. cordiformis 'Imshu'
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Juglans ailantifolia var. cordiformis 'Imshu' Japanese walnut 'Imshu'
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Companion plants (0)

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