Tag Archives: Black Walnut (Juglans nigra)

Winter Tree Identification – Bark!

February 17, 2025

Winter and tree identification leaves me looking at the bark. This is Black Walnut (Juglans nigra), a tree that is quite common here. The tree produces a chemical, juglone, in all its parts.

Juglone creates a toxic reaction in other plants. An example of its effectiveness is at the yoga studio where I hang out. There are perhaps three Black Walnut trees there. Under the trees and in the immediate surrounding area there is only grass, and no other plants or weeds – nothing.

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Leaves Long Gone

Black Walnut leaves (Juglans nigra) with their many leaflets turn from green to yellow early in autumn and with that change of color, they quickly fall to the ground. I love to capture the texture those leaves create against the blue sky before those leaves begin to drop.

The Black Walnut tree is also one that produces leaves quite late in the spring, in late May in some places. Early leaf loss, late leaf budding. A long time without leaves.

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