Black Walnut Tolerant
Black Walnut trees produce a chemical called hydrojuglone, which is found in the leaves, stems, fruit hulls, inner bark and roots. When exposed to the air or soil, hydrojuglone is oxidized into the chemical juglone. Juglone is toxic to a number of plants, but there are also many plants that are resistant to the toxins. The native plants in this category are compiled from a variety of reliable sources and from our own experience. Note: Soil that is compacted, slow draining, or lacks sufficient healthy microbial growth, will have less success supporting plants under Black Walnut trees.