Home & Garden Trees & Houseplants

Plants Affected by Black Walnuts




    • Norway spruce trees die from black walnut toxicity.spruce image by DOLPHIN from Fotolia.com

      Several tree varieties are among the plants affected by black walnuts. Mugo pine trees, red pine trees, white pine trees, silver maples, hackberry trees, white birch trees, European alder trees and Norway spruces cannot grow near black walnuts. Since tree roots often spread out relatively far in the ground, gardeners may want to plant these trees a little bit more than 50 feet from a black walnut tree's drip line.

    Flowers, Shrubs and Perennials

    • Hydrangeas and a few other flowers do not grow near black walnut trees.hydrangea image by L. Shat from Fotolia.com

      Purdue University Horticulture, Ohio State University and the Morton Arboretum warn that rhubarb, lilies, tobacco, columbine, some peonies, hydrangea, most rhododendrons, some narcissus, honeysuckle, cinquefoil, chokeberry, red laurels, yew and lilacs die from the black walnut's chemicals in the soil. Ohio State University explains that peonies, viburnum plicatum tomentosum and chrysanthemums might grow near black walnut trees but will not grow as well near them as they would grow away from the trees.

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