About
Juglans nigra, commonly known as black walnut, is a robust, large deciduous tree characterized by its wide crown. It features prominent pinnate leaves made up of 15 to 21 lance-shaped leaflets. The tree produces male catkins that can reach lengths of 10 cm, while the female flowers are inconspicuous. After flowering, it bears round green fruits that grow to about 5 cm in diameter.
About the genus
Juglans are trees that shed their leaves in autumn, characterized by their compound leaves. They produce subtle flowers arranged in catkins, which are succeeded by typically edible nuts.
Growing conditions
- Sunlight
- Full sun
- Soil type
- Chalk, Clay, Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained, Well-drained
- Aspect
- South-facing, West-facing, East-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H6
Plant details
- Plant type
- Trees
- Habit
- Bushy
- Foliage
- Deciduous
- Height
- Higher than 12 metres
- Spread
- wider than 8 metres
- Time to full height
- More than 50 years
- Native to
- E USA
Care notes
- Cultivation
- Grow as a specimen tree in any well-drained or moist but well-drained soil in full sun
- Pruning
- Pruning group 1
- Propagation
- Propagate by seed or grafting
- Pest resistance
- May be susceptible to aphids and walnut blister mite
- Disease resistance
- May be susceptible to walnut leaf spot, walnut leaf blotch, honey fungus and coral spot