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Juglans nigra (F)

black walnut

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

Other common names
American walnut

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Size
Ultimate height
Higher than 12 metres
Time to ultimate height
more than 50 years
Ultimate spread
Wider than 8 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green Green
Summer Green
Autumn Green
Winter
Position
  • Full sun
Aspect

South–facing or West–facing or East–facing

Exposure
Exposed or Sheltered
Hardiness
H6
Botanical details
Family
Juglandaceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy
Genus

Juglans are deciduous trees with pinnate leaves, and inconspicuous flowers in catkins followed by usually edible nuts

Name status

Correct

Plant range
E USA

How to grow

Cultivation

Grow as a specimen tree in any well-drained or moist but well-drained soil in full sun

Propagation

Propagate by seed or grafting

Suggested planting locations and garden types
  • Low Maintenance
Pruning

Pruning group 1

Pests

May be susceptible to aphids and walnut blister mite

Diseases

May be susceptible to walnut leaf spot, walnut leaf blotch, honey fungus and coral spot

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