Black walnuts are allelopathic--they produce substances toxic to other plants. Frank Robinson, executive director of the American Horticultural Society, provides this list of plants that can survive in the shade of black walnut trees.

Herbaceous Perennials

• Ajuga reptans, bugleweed
• Alcea rosea, hollyhock
• Asarum europaeum, European wild ginger
• Astilbe
• Campanula latifolia, bellflower
• Chrysanthemum, hardy chrysanthemum
• Doronicum, leopards bane
• Dryopteris cristata, crested wood fern
• Galium odoratum, sweet woodruff
• Geranium robertianum, herb Robert
• Geranium sanquineum, cranesbill
• Helianthus tuberosus, Jerusalem artichoke
• Hemerocallis fulva, common daylily
• Heuchera x brizoides Pluie de Feu , coral bells
• Hieracium aurantiacum, orange hawkweed
• Hosta fortunei Glauca
• Hosta lancifolia
• Hosta marginata
• Hosta undulata Variegated '
• Hydrophyllum virginianum, Virginia waterleaf
• Iris sibirica, Siberian iris
• Monarda didyma, bee balm
• Monarda fistulosa, wild bergamot
• Oenothera fruticosa, sundrops
• Onoclea sensibilis, sensitive fern
• Osmunda cinnamomea, cinnamon fern
• Phlox paniculata, summer phlox
• Polemonium reptans, Jacob s ladder
• Polygonatum commutatum, great Solomon s seal
• Primula x polyantha, polyanthus primrose
• Pulmonaria, lungwort
• Sanquinaria canadensis, bloodroot
• Sanquinaria canadensis Multiplex , double-flowered bloodroot
• Sedum acre, gold moss
• Sedum spectabile, showy stonecrop
• Stachys byzantina, lamb s ear
• Tradescantia virginiana, spiderwort
• Trillium cernuum, nodding trillium
• Trillium grandiflorum, white wake-robin
• Uvularia grandiflora, big merrybells
• Viola canadensis, Canada violet
• Viola sororia, woolly blue violet

Bulbs

• Chionodoxa luciliae, glory-of-the-snow
• Crocus
• Endymion hispanicus, Spanish bluebell
• Eranthis hyemalis, winter aconite
• Galanthus nivalis, snowdrop
• Hyacinthus City of Haarlem
• Muscari botryoides, grape hyacinth
• Narcissus Cheerfulness
• Narcissus Yellow Cheerfulness
• Narcissus Geranium
• Narcissus Tete a Tete
• Narcissus Sundial
• Narcissus February Gold
• Scilla siberica, blue squill
• Tulipa Darwin White Volcano
• Tulipa Darwin Cum Laude
• Tulipa Parrot Blue Parrot
• Tulipa Greigii Toronto

Trees

• Acer palmatum, Japanese maple
• Acer palmatum Dissectum , cutleaf Japanese maple
• Catalpa bignonioides, common catalpa
• Tsuga canadensis, Canadian hemlock

Vines and Shrubs

• Clematis Red Cardinal
• Daphne mezereum, February daphne
• Forsythia suspensa, weeping forsythia
• Hibiscus syriacus, rose of Sharon
• Lonicera tatarica, tartarian honeysuckle
• Parthenocissus quinquefolia, Virginia creeper
• Rhododendron periclymeniodes, pinxterbloom
• Rhododendron Exbury hybrids Gibraltar and Balzac

Annuals

• Begonia, fibrous cultivars and tuberous cv Nonstop
• Calendula officinalis, pot marigold
• Opomoea Heavenly Blue , morning glory
• Viola cornuta, horned violet
• Viola x wittrockiana, pansy

Courtesy of

American Horticultural Society
7931 East Boulevard Drive
Alexandria, VA 22308-1300
(800) 777-7931
FAX: (703) 768-7533
dellis[at]ahs.org
www.ahs.org

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