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Plants: Species

Walnut: Black Walnut Juglans californica


The Southern California black walnut Juglans californica is prized for its rounded, flavorful nuts and for its ability to tolerate drought and poor soil. The only trick is that the nuts have extremely thick, hard shells, probably to protect those precious seeds from marauding foragers like us!

Black walnut trees are serious about keeping their space to themselves. Their leaves, bark, and roots contain a strong chemical, juglone, that withers competitive plants that try to set their roots too close for comfort.