To recognize black walnut, look for very long alternate compound leaves, usually 12 to 24 inches (30 to 60 cm) long, with many narrow leaflets along one central stalk, plus large round green husked fruits about 2 inches (5 cm) wide.
Mature trees also show dark, deeply furrowed bark in long interlacing ridges.
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Check black walnut for a tall tree form with very large compound leaves and round husked fruits.
The leaf size, high leaflet count, and husked round fruits are the fastest visual clues.
Juglans nigra shows clear visual shifts from seedling to fruiting tree, useful for identification.
In spring, black walnut leafs out with long compound leaves, and drooping male catkins become easy to spot as the tree flowers. By late summer into fall, round green husked fruits are often visible and can litter the ground beneath the canopy. After leaf drop in fall, the stout twigs, chambered pith, and deeply furrowed dark bark are more visible, giving the tree a heavier, rugged winter outline.
A few walnut relatives are regularly mistaken for Juglans nigra.
English walnut(Juglans regia)
Both are large trees with pinnate leaves and round nuts. English walnut usually has 5-9 broader leaflets, often with smoother margins. Its husked fruit is more smooth and less rough than black walnut.
butternut(Juglans cinerea)
This is another walnut with long compound leaves and similar branching. Butternut leaflets are usually more numerous, often 11-17, and the fruit is oblong rather than round.
pecan(Carya illinoinensis)
Pecan can suggest walnut from a distance because it also has long pinnate leaves. The quickest check is fruit: pecan makes a narrow, elongated nut, not a round husked walnut.
Juglans nigra is native to eastern and central North America, from southern Ontario and the northeastern US west to the Great Plains, and south to Georgia, Alabama, and eastern Texas. It is most often found in rich bottomland woods, floodplains, stream banks, and moist lower slopes. Finding a walnut in these fertile inland habitats helps separate it from species more typical of drier uplands or coastal sites.
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A strong clue in black walnut identification is the large pinnate leaf with 15 to 23 narrow leaflets, usually lacking a terminal leaflet, plus round green husked fruits and dark, deeply furrowed bark on mature trees.
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