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Plants that survive under Black Walnut Trees
Black Walnut trees produce a toxin called juglone. This toxin prevents many plants from growing under or within the root zone of Black Walnuts. The roots seem to contain the highest concentration of juglone, but all parts of the tree including leaves, stems and fruit contain some of the toxin.
The following plants have been observed surviving under Black Walnut
Shrubs and Vines:
Arborvitae (Thuja)
Azalea (Rhododendron)
Beautybush (Linneae amabalis)
Black Raspberry (Rubus occidentalis)
Clematis
Forsythia
Honeysuckle (Lonicera)
Kerria Japonica (Pleniflora)
Lilac (Syringa)
Mock Orange (Philadelphus)
Quince (Cydonia oblonga)
Rhododendron
Rose of Sharon (Hibiscus syriacus)
Virginia Creeper (Parthenocissus quinquefolia)
Weeping Forsythia
Winter Creeper (Eunonymus)
Herbaceous Perennials:
Bee Balm (Monarda)
Bell Flower (Campanula)
Bleeding Heart (Dicentra)
Bugleweed (Ajuga)
Coral Bells (Heuchera)
Chrysanthemum (Mum)
Cinnamon Fern (Osmundastrum cinnamomeum)
Daylily (Hemerocallis)
Echinacea (Coneflower)
False Spirea (Astilbe)
Foxglove (Digitalis)
Geranium (Cranesbill)
Hollyhock (Alcea rosea)
Hosta
Jacob's Ladder (Polemonium caeruleum)
Lamb's Ear (Stachys byzantine)
Leopard's Bane (Aconitum)
Lungwort (Pulmonaria officinalis)
Herbaceous Perennials, cont'd.
Peony (Paeonia)
Phlox
Siberian Iris (Iris sibirica)
Sensitive Fern (Onoclea sensibilis)
Solomon's Seal (Polygonatum)
Sedum (Stonecrop)
Shasta Daisy (Leucanthemum × superbum)
Spiderwort (Tradescantia)
Sweet Woodruff (Galium odoratum)
Annuals:
Begonia hybrid
Common Marigold (Calendula officinalis)
Morning Glory (Ipomoea purpurea)
Pansy
Sweet Potato Vine (Ipomoea batatas)
Zinnia
Onion
Parsnips
Snap Beans
Squash
Trees:
Arborvitae (Thuja)
Black Cherry (Prunus serotine)
Black Locust (Robinia pseudoacacia)
Eastern Redbud (Cercis canadensis)
Flowering Dogwood (Cornus florida)
Hackberry (Celtis occidentalis)
Honey Locust (Gleditsia triacanthos)
Holly (Illix aquafolium)
Japanese Maple (Acer palmatum)
Pawpaw (Asimina trilobal)
Pear Tree (Pyrus)
Red Oak (Quercus rubra)
Spruce (Picea)
Sugar Maple (Acer saccharum)
Sweetgum (Liquidambar styraciglua)
Viburnum
White Oak (Quercus alba)
