Planting Around Black Walnut Trees 

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Black walnut trees produce a chemical called juglone that inhibits the growth of neighboring plants. It is a means of eliminating competition, referred to as allelopathy The following list contains plants that show tolerance of this chemical:

Perennials:

Achillea spp. (Yarrow)
Ajuga reptans (Bugleweed)
Anemone spp. (Anemone)
Arisaema triphllum (Jack in the Pulpit)
Aster spp. (Aster)
Astilbe spp. (False Spirea)
Athyrium spp. (Fern)
Campanula spp. (Bellflower)
Chelone spp. (Turtlehead)
Chrysanthemum spp. (Hardy Mum)
Dicentra spectabalis (Bleeding Heat)
Galium odoratum (Sweet Woodruff)
Gentian spp. (Bottle Gentian)
Geranium spp. (Geranium)
Helianthus spp. (Sunflower)
Helleborus spp. (Lenten Rose)
Hemerocallis spp. (Daylily)
Heuchera spp. (Coral Bells)
Hosta spp. (Plaintain Lily, Hosta)
Iris spp. (Iris)
Lobelia spp. (Cardinal Flower)
Monarda spp. (Bee Balm)
Phlox paniculata (Garden Phlox)
Polygonatum commutatum (Solomon's Seal)
Pulmonaria spp. (Lungwort)
Sedum spp. (Stonecrop, Sedum)
Stachys byzantia (Lamb’s Ear)
Thalictrum spp. (Meadow Rue)
Tradescantia virginica (Spiderwort)

Vines:
Clematis spp. (Clematis)
Wisteria frutescens (American Wisteria)

Shrubs:

Amelanchier spp. (Serviceberry)
Corylus americana (Hazlenut)
Forsythia spp. (Forsythia)
Hamamellis spp. (Witch Hazel)
Hydrangea arborescens (Smooth Hydrangea
Hypericum spp. (St Johns Wort)
Juniperus spp. (Juniper)
Lindera benzoin (Spicebush)
Philadelphus coronarius (Mock Orange)
Ribes spp. (Black Currant)
Rubus spp. (Black Raspberry)
Sambucus canadensis (Elderberry)
Viburnum acerfolia (Mapleleaf Viburnum)
Viburnum carlesii (Korean Spice Viburnum)

Trees:

Aesculus glabra (Ohio Buckeye)
Acer rubrum (Red Maple)
Asimina triloba (Pawpaw)
Betula nigra (River Birch)
Carya spp. (Hickory)
Cercis canadensis (Eastern Redbud)
Chionanthus spp. (Fringetree)
Cornus florida (Flowering Dogwood)
Diosypros virginiana (Persimmon)
Fagus grandifolia (American Beech)
Liquidambar styraciflua (Sweet Gum)
Liriodendron tulipifera (Tulip Poplar)
Nyssa sylvatica (Black Gum)
Sassafras albidum (Sassafras)
Thuja occidentalis (Arborvitae)
Quercus spp. (Oak)
Ulmus spp. (Elm)

Susceptible Plants

Apple, Azalea, Baptisia, Columbine, Egg Plant, Green Pepper, Hydrangea, Mountain Laurel, Peony, Petunia, Potato, Tomato, White Pine, Yew 

Sources: Compiled from experience and information from the Pennsylvania, Wisconsin, Minnesota, West Virginia, and Ohio

Cooperative Extension services. For more information visit us on the web at www.behmerwald.com