Black Walnut


(Juglans nigra subsp. null)

Native to Niagara and eastern United States. The Black Walnut is known for its valuable wood, distinct fruit and tasty, edible nuts. Occasionally planted in urban areas, but more often found in the wild due to the large tap root when cultivating. The trunk is single, with loose-open branching and long compound leaves. Roots let out a chemical called Juglone to deter certain plants, such as those of the nightshade family, form growing near the tree.


Long, compound leaves with 13 - 23 leaflets. Fall colour is not highly regarded, usually yellow, brown, or green. Leaf arrangement is alternate.


Edible, roast-able and tasty. Most black walnut trees are planted by squirrels that spread and store the nuts in the ground.

Twigs & Buds

Unique, hardy bud and leaf scar shape. Twigs are thick and have a chambered pith, which can be seen in cross-section taken length-wise. Distinct ridged and furrowed bark runs along the length of the trunk and continues all the way to the top of the tree.


Hard, heavy, strong and rot resistant wood. Highly valued for furniture, flooring, veneer and coffins.

Pests & Disease

Caterpillars (Fall Webworm) feed on the leaves. Signs of an infestation include large webs on branches that resemble, spider webs. Usually not critical to the health of the tree.