Assertion: black walnut's juglone | /r/AtLocation | the epicarp
Facets:
value: naturally
type: MANNER
Source sentences:
text: Juglone occurs naturally in the leaves, roots, husks, fruit (the epicarp), and bark of plants in the Juglandaceae family, particularly the black walnut (Juglans nigra), and is toxic or growth-stunting to many types of plants.