About
Juglans nigra, the black walnut, is a vigorous, broad-crowned, deciduous tree reaching up to 30 m tall with deeply furrowed, dark bark and large, pinnate leaves of 15�21 lanceolate leaflets. Globe-shaped, green fruits 5 cm across contain richly flavoured, edible kernels. The timber is highly prized for furniture and gunstocks. A magnificent specimen tree for a large garden.
About the genus
Juglans, the walnuts, are large, deciduous trees with aromatic, pinnate leaves, insignificant flowers in catkins and edible or ornamental nuts enclosed in fleshy green husks. Grown as specimen trees and nut crops.
Growing conditions
SunlightFull sun
Soil typeChalk, Clay, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureMoist but well-drained, Well-drained
AspectSouth-facing, West-facing, East-facing
ExposureExposed, Sheltered
UK hardinessH6
Plant details
Plant typeTrees
HabitBushy
FoliageDeciduous
HeightHigher than 12 metres
Spreadwider than 8 metres
Time to full heightMore than 50 years
Suggested usesSpecimen planting, large borders, parkland settings.
Native toE USA
Care notes
CultivationGrow as a specimen tree in any well-drained or moist but well-drained soil in full sun
PruningPruning group 1
PropagationPropagate by seed or grafting
Pest resistanceMay be susceptible to aphids and walnut blister mite
Disease resistanceMay be susceptible to walnut leaf spot, walnut leaf blotch, honey fungus and coral spot