The Black Walnut is a handsome, fast-growing tree, native to North America, but planted in Britain as an ornamental. With its glossy hanging leaves and domed crown, it is an impressive sight in parkland and larger gardens. It needs warmer conditions to do well than the Common Walnut, but in good years will produce a good crop of nuts.
Site and soil
Requires deep rich soil and warmth. More tolerant of wet soils than the Common Walnut.
Height and spread
After 10 years: 8m x 4m After 20 years 15m x 7m
Leaf and bark
The large leaves are pinnate, to 60cm, with 11-23 leaflets; they are glossy and aromatic. The bark is very dark grey-black and deeply fissured.
Flower, seed and fruit
The flowers are greenish catkins produced in May/June, followed by oval to round green fruits about 5cm across. These contain a husk which encloses the familiar walnut. The walnuts are more difficult to extract then the Common Walnut.
Ornamental tree, woodland. Walnut timber is very high quality and is used for furniture and veneers and the leaves and bark are used medicinally to treat skin complaints. The shell has been used in hair dyes, and both the leaves and husks yield dyes. Walnuts are grown commercially for their nuts.
The main reasons for buying protection is to protect the plants against:
When it comes to deciding what protection to choose the golden rule is to choose the product dependent on which pest you are protecting against. The below will help you in deciding what height of protection you will need.
Vole, Mice 20cm
Roe Deer, Muntjac 1.20m
Fallow Deer 1.50m
Pest & Minimum Protection Height
Protection Type Where more than one size is listed, the wider diameter protection is recommended for taller, bushier plants.
Support Required Taller support is recommended for use in sandier, lighter soils and wider/stronger support should be used at exposed sites.