Synonyms: Eastern Black Walnut, Wallia nigra.
Leaves pinnately compound, with 9-23 leaflets; terminal leaflet usually lacking, in contrast to Butternut, in which a terminal leaflet is usually present (Weakley, et al., 2012).
Black Walnut grows in rich soil of mesic upland forests, floodplain forests, open fields, and fencerows Weakley, et al., 2012). It has been recorded from every county in Maryland, but is most common in the northern and western counties. Not frequent on the lower Eastern Shore (Brown and Brown, 1982).
Black Walnut produces an allelepathic substance called juglone, which inhibits the growth of plants beneath it.
Has been recorded as a host plant for Banded Hairstreak.
Host plant for various moth species including Luna Moth, Regal Moth, Imperial Moth, Walnut Sphinx Moth, Fall Webworm Moth, Walnut Caloptilia, Pecan Leafminer Moth, Monkey Slug Moth, Skiff Moth, Sad Underwing Moth, Bride Underwing Moth, Penitent Underwing Moth, Yellow-gray Underwing Moth, Widow Underwing Moth, Banded Tussock Moth, Angus's Datana Moth, Walnut Caterpillar Moth, Red-humped Caterpillar Moth, Black-blotched Schizura Moth, Closebanded Yellowhorn Moth, Walnut Shoot Moth, Pecan Leaf Casebearer Moth, American Plum Borer, Hickory Shuckworm Moth, Pecan Bud Moth, Gray-edged Bomolocha Moth, Sleeping Baileya Moth, and Small Baileya Moth.
Decaying shells host the fungus Walnut Mycena (Database of World's Lepidopteran Host Plants).
The fruit fly pest Walnut Husk Maggot feeds on Black Walnut fruit.
Black Walnut is used a host for the Butternut Woollyworm.
There are 340 records in the project database.
| GA | AL | WA | FR | CL | MO | HO | BA | BC | HA | CE | PG | AA | CV | CH | SM | KE | QA | CN | TA | DO | WI | SO | WO |
