The California Black Walnut is found most often growing as a part of the Oak Woodland ecosystem. Unlike the other protected tree species, this tree does not reach great height and is most often found in a multi-trunk form. Typically the California Black Walnut contains several trunks reaching twenty to twenty-five feet. This species is deciduous and bears an edible fruit although the fruit is small and can be tough to extricate from its covering and shell.

The California Black Walnut is a tough tree that even when cut down to a stump often re-grows. The leaves, bark, and fruit debris are toxic to other plants and it is not unusual to find the area under the trees canopy completely devoid of other plant life. Like the Coast Live Oak, the California Black Walnut is extremely drought tolerant and does not like to be too wet.

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