Hybrid species tend to inherit the best characters of both parents, and Hybrid Walnut is no exception, having some of the timber quality of Common Walnut with the superior form of Black Walnut.

Cultivated.

Monoecious. A fertile hybrid between Common Walnut and Black Walnut, where either can be the maternal parent.

Tall (30m), single-stemmed, vigorous, with a strong leader. Twigs glabrous, with heart-shaped (obcordate) leaf scars notched above. Leaves pinnate compound, variable in size, with 11-13 finely serrate leaflets and conspicuous hair tufts in the main vein axils. Fruit a thick-husked drupe with a smooth, thick-shelled nut. It appears intermediate between its parents, Common and Black Walnut.

Plant in fertile, well-drained soils to see this hybrid grow unlike any other walnut, with strong apical dominance and a straight stem. Branches enlarge quickly, so prune the trunk in stages towards a knot-free, fine-timber stem. As with all walnuts, prune in July. Some of the best cultivars include 'NG23' and 'NG38'.

No notable associations where introduced.

Generally without problems.

Hybrid Walnut is nearly always grown for timber, though natural hybrids arise spontaneously. Its timber lacks the fine colour and figure of Common Walnut, compensated by its vigour. On the European mainland it is sliced for veneer, often steamed to create the familiar dark walnut appearance.