black walnut
Also known as: American walnut
J. nigra is a vigorous, large, deciduous, broad-crowned tree with large pinnate leaves composed of 15-21 lanceolate leaflets, with 10cm long male catkins and insignificant female flowers followed by globose green fruits, 5cm wide
Scientific classification
- Species
- black walnut (Juglans nigra)
- Genus
- Juglans
- Family
- Juglandaceae
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- Toxicity
- Trees
- Plant type
- Higher than 12 metres
- Height
- wider than 8 metres
- Spread
- Deciduous
- Foliage
- Bushy
- Habit
- Spring · Summer · Autumn
- Season of interest
- Full sun
- Sunlight
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- Ideal temperature
black walnut pictures
Distribution of black walnut
Distribution map
Eastern USA
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Culture
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Toxicity
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Quick identification of black walnut
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black walnut care guide
- Moderate regular watering, allowing brief slight drying between soakings
- Watering
- Full sun
- Sunlight
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- Ideal temperature
Watering
Moderate regular watering, allowing brief slight drying between soakings
Fertilizing
FertilizingBalanced perennial feed every four weeks from spring through summer
Pruning
PruningLittle pruning is needed. Remove diseased, damaged, crowded or crossing shoots and unwanted growth. Timing depends on the plant: generally late winter or early spring; plants prone to bleeding and deciduous magnolias need different timing, and deciduous azaleas and lilacs are pruned after flowering.
Propagation
PropagationPropagate by seed or grafting
Growing
GrowingGrow as a specimen tree in any well-drained or moist but well-drained soil in full sun
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Common pests and diseases
Diseases
May be susceptible to walnut leaf spot, walnut leaf blotch, honey fungus and coral spot
Pests
May be susceptible to aphids and walnut blister mite
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