Juglone

Juglone is an compound that occurs naturally in the leaves, roots, husks, fruit, and bark of plants in the Juglandaceae family, particularly the black walnut. Pictured are black walnut shells which includes the compound.

Juglone is an compound that occurs naturally in the leaves, roots, husks, fruit, and bark of plants in the Juglandaceae family, particularly the black walnut. It is an allelochemical and is toxic or growth-stunting to many types of plants and sometimes used as an herbicide.