Answer: The leaves, bark and roots of walnut trees contain a growth inhibiting chemical called Juglone. Some plants are extremely sensitive to Juglone and others are quite tolerant. Ivy is tolerant of Juglone, as are Astilbe, Bee Balm, Bellflower, Bergamot, Ajuga, Coral Bells, Crocus, Shasta daisy, wild ginger, Lamb's ear, Lungwort, Morning Glory, Pansy, Phlox, Marigold, Primrose, Sweet Cicely, Honeysuckle and Zinnia. When planting under any tree, remember that feeder roots close to the surface of the soil will compete with the roots of other plants. As a result, you may have to water more frequently to keep the plants supplied with adequate moisture.
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