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Black Walnut

Juglans nigra • American Walnut, American Black Walnut


Black walnut produces the most highly valued hardwood used in furniture. It is a large, growing between 30-40 meters tall. It is a common species in the moist bottom-lands in southwestern Ontario. It has been frequently planted north and east of its range. It can live to be 150 years old. Black Walnut contains a toxin (juglone) from roots and leaves which prevent other plants from establishing under the tree. The seeds of the Black Walnut are difficult to extract from their shells, but are high in fat and make a delicious and nutritious snack for humans and wildlife.


Compound and pinnately divided into 14-23 leaflets. Leaves yellowish-green, smooth above and somewhat hairy underneath. Finely toothed leaves. 20-60 cm long. Leaflet on tip small or absent.


Round, yellow-green to brown. Fragrant. Irregularly smooth-ridged shell that has a slightly hairy husk. Hangs in clusters of 1-3.


Mature bark almost black, with rounded ridges.


Green and tiny. Male and female on same tree. Male flowers in hanging catkins, female in clusters of 1-4. Flowers in spring.

186 Trees

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