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Black Walnut, Eastern Black Walnut
Scientific Name: Juglans nigra L.
Juglans nigra, Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 579.
Recommended Temperature Zone:|
Sun Exposure: Full sun
Origin: Eastern North America, southeastern New Brunswick to northern Mississippi
Growth Habits: Deciduous tree, 50 to 75 feet tall (15-23 m) or more; alternate, odd-pinnately compound leaves, with the terminal leaflet missing or misshaped, 12 to 24 inches long (30-60 cm), with 10 to 23 serrated leaflets, 3 to 5 inches long (7.5-12.5 cm), odoriferous when bruised
Watering Needs: Moist, well drained soils, relatively drought resistant
Propagation: Named varieties are grafted on same species seedlings
The black walnuts are difficult to transplant because of their long tap root. They secrete a substance (juglone) that prevents close-by plants to grow.
The male flowers are long catkins, 2.4 to 5.6 inches long (6-14 cm). The female flowers are yellowish green, on short spikes, close to the end of the twigs. The black walnut blooms in the spring (April to June).
The fruit is a round nut, 1 to 1.6 inches in diameter (2.5-4 cm), containing a tasty, oily seed, ripening in the fall (September-October). It is surrounded by a very hard thick shell. The trees start producing seeds when they are about 20 years old.
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