| Section2 = | Section7 = | SPhrases = A }} | Section8 = }} Juglone's an aromatic organic compound with the molecular formula C10H6O3. It occurs naturally in the leaves, roots and bark of plants in the Juglandaceae family, particularly the black walnut. Juglone's an allelopathic compound, meaning it's synthesized by one type of plant and affects the growth of another. In the case of juglone, it's toxic or growth-stunting to many types of plants. Landscapers have long known that gardening undern… (More on Juglone)