- Mature height
- 20m to 30m (approx.)
- Mature width
- 15m to 30m
Juglans nigra, the Black Walnut, is a majestic deciduous tree valued both for its exceptional timber and its stately presence in the landscape. Large pinnately compound leaves provide lush green shade through the warmer months, turning a clear yellow in autumn.
Black Walnut grows to 15-25 metres tall and wide, developing a rounded canopy on a straight trunk for a grand, stately form. It makes a magnificent shade tree for large gardens, rural properties, and parks. Trees produce edible walnuts with a rich distinctive flavour after several years.
Black Walnut performs best in cool to temperate regions including VIC, NSW, ACT, Tasmania, and elevated parts of SA and WA, in full sun with deep well-drained soil. It is drought tolerant once established and low maintenance. Note its roots release juglone, a natural compound that can inhibit some other plants nearby.
Frequently Asked Questions
About Juglans nigra Black Walnut
How tall does Black Walnut grow?
Juglans nigra grows to 15-25 metres tall and 12-18 metres wide with a broad rounded canopy.
How fast does Black Walnut grow?
Black Walnut is moderately fast-growing, adding 50-80cm per year once established.
Does Black Walnut produce edible nuts?
Yes. Juglans nigra produces edible walnuts with a rich, distinctive flavour, encased in a hard shell. Trees take several years to begin bearing.
Is Black Walnut deciduous?
Yes. Black Walnut is fully deciduous, with large compound leaves that turn yellow in autumn before dropping in winter.
Is Black Walnut suitable for residential gardens?
Black Walnut suits large gardens, rural properties, and parks due to its mature size. Note that its roots release juglone, a natural compound that can inhibit some other plants nearby.
Where does Black Walnut grow best in Australia?
Black Walnut performs best in cool to temperate regions including VIC, NSW, ACT, Tasmania, and elevated parts of SA and WA, in deep well-drained soil.
How far apart should I plant Black Walnut?
Plant 8-12 metres apart given the broad mature canopy, or as individual specimens with plenty of room.