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Commonly known as Black walnut, Jupiter's nuts
leaves to 60cm (24in) long consisting of 11-23 ovate-oblong, glossy, dark-green leaflets.
To 30m (100ft)
To 20m (66ft)
Vigorous, spreading tree. Male flowers are in drooping catkins to 10cm (4in) long. Edible nuts within spherical fruit to 5cm (2in) long.
Hardy - very cold winter Hardy in all of UK and northern Europe. Plant can possibly withstand temperatures down to -20°C (-4°F)
Prefers a sheltered sunny spot.
Good to know - roots produce juglone which can inhibit growth of plants within the crown area.
Pests & Diseases
aphids, walnut blister mites,honey fungus, leaf and coral spot.
Place of origin
Pinnate see photos above
Entire see photos above
Oblong see photos above
Pruning group 1
Suitable for: Deciduous and evergreen trees, and some deciduous shrubs.
Pruning: Minimal pruning required. Prune wayward or crossing branches to maintain a healthy framework.
When: When dormant in the late winter/early spring. Some in the summer/autumn to prevent bleeding of sap.
RHS group 1
Scented foliage - aromatic leaves.
Fertile moist well-drained soil
Rounded to broadly spreading
- How to plant a tree - Video Tip ondemand_video
- How to plant a tree
- Ties - Video Tip ondemand_video
- Restaking fallen young trees - Video Tip ondemand_video
- Fallen old tree - Video Tip ondemand_video
- Clearing up fallen beech tree - Video Tip ondemand_video
- Spring pruning - Video Tip ondemand_video
- Removing side shoots - Video Tip ondemand_video
- Pruning and Shaping Magnolia - Video Tip ondemand_video
- Deer protection - Video Tip ondemand_video
- Weed Spraying - Video Tip ondemand_video
- Removing Ivy - Video Tip ondemand_video
- Removing wire protection - Video Tip ondemand_video
- Tree Survey - Video Tip ondemand_video
- Crown uplift - Video Tip ondemand_video
- Removing shoots below graft - Video Tip ondemand_video
- Removing peeling bark - Video Tip ondemand_video
- Maintaining variegation - Video Tip ondemand_video
to 30m (100ft)
to 20m (66ft)