Walnut Toxicity
It has been proven that the foliage and roots of the Black Walnut contain a chemical named juglone. This chemical is toxic to many other kinds of species, causing death or poor growth of these species when growing under the branch spread. Hence, the Black Walnut should not be grown near valued specimens.
Plants resistant to Walnut Toxicity:
Trees: Dogwood (Alternate-leaved) American Barberry American Elm Beech Bittersweet Black Birch Black Cherry Black Gum Black Locust Black Oak Dwarf Sumac European Euonymous Five-leaved Aralia Flowering Dogwood Gray Dogwood Hawthorn Hazelnut Hickory Honey Locust Maple-leaved Viburnum Ohio Buckeye Papaw Red Oak Sassafrass Staghorn Sumac Sugar Maple Sycamore Tree of Heaven Tulip Tree White Oak Wild Rose Winged Euonymous Japanese Maple Common Catalpa Redbud Quince Red Cedar Canadian Hemlock | Shrubs: Clematis (Red Cardinal) Forsythia Spice Bush Shrubby St. Johnsworth Rose of Sharon Tartarian Honeysuckle Virgina Creeper Rhododendron (Exbury Hybrid Gilbraltor, Balzac) Perennials: Bugleweed Hollyhock Astilbe Campanula latifolia Chrysanthemum Leopard's Bane Sweet Woodruff Bloody Cranesbill Jerusalem Artichoke Daylily Hosta fortunei Hosta Lancifolia Hosta marginata Hosta undulata Siberian Iris Beebalm Sundrops Sensitive Fern Cinnamon Fern Garden Phlox Jacob's Ladder Polyanthus primrose Lungwort Bloodroot Gold Moss Lambs Ear Spiderwort Trillium grandiflora Canada violet | Annuals: Begonia Calendula Morning Glory Horned Violet Zinnia Vegetables & Fruits: Beets Cabbage Cauliflower Bean Black Raspberry Corn Currant Onions Oats Wax Beans Snap Beans Parsley Peas Bulbs: Crocus Grape Hyacinth Narcissus Daffodil varieties -Cheerfulness, Geranium, Sundial, Feb. Gold) Bl. Squill Tulip (Tulipa, Darwin, White Volcano, Gerigii Toronto) Other: Kentucky Bluegrass |
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