Johannsen's Greenhouses - Gardening Tips

Plants that are resistant to Walnut Toxicity*

*Herbaceous Perennials*
Scientific Name	Common Name
Achillea millefolium Ajuga reptans Alcea rosea Arisaema triphyllum Asaarum europaeum Aster Astible Campanula latifolia Chrysanthemum Dentaria spp. Doronicum Dryopteris cristata Eupatorium purpureum Galium odoratum Geranium robertianum Geranium sanguineum Hesperis matronalis Hemerocallis fulva Heuchera x brizoides Hosta Hydrophyllum virginian. Hypericum spp. Iris sibirica Monarda didyma Monarda fistulosa Oenothera fruticosa Onoclea sensibilis Osmunda cinnamomea Paeonia Phlox paniculata Polemonium reptans Polygonatum commu. Primula x polyantha Pulmonaria spp. Rudbeckia spp. Sanguinaria canadensis Sedum spp. Solidago spp. Stachys byzantina Tradescantia virginiana Trillium cernuum Viola canadensis Viola soroia Viola spp.	Yarrow Bugleweed Hollyhock Jack in the pulpit European wild ginger Bellflower Toothwort Leopards bane Crested wood fern Joe-Pye weed Sweet woodruff Herb robert Cranesbill Dame’s rocket Common Daylily Coral bells Virginia waterleaf St. John’s-wort Siberian iris Bee balm Wild bergamot Sun drops Sensitive fern Cinnamon fern Peony Summer phlox Jacob’s ladder Solomon’s seal Primrose Lungwort Black-eye Susan Bloodroot Goldenrod Lamb’s ear Spiderwort Nodding trillium Canada violet Wooly blue violets Johnny Jump-ups
*Annuals*
Scientific Name	Common Name
Begonia (fiberous and tuberous) Calendula Officinalis Coleus Impatiens Ipomea Tagetes Viola wittrockiana Zinnia elegans	Pot marigold Morning glory Marigold Pansy Zinna
*Bulbs*
Scientific Name	Common Name
Chionodoxa luciliae Crocus Endymion hispanicus Eranthis hyemalis Galanthus nivalis Hyacinth Lilium Muscari botryoides Narcissus Scilla siberica Tulipa	Glory of the snow Spanish bluebell Winter aconite Snowdrop Asiatic Lilies Grape hyacinth Blue squill Darwin, parrot type
*Vegetables*
Scientific Name	Common Name
Curcurbita Beta vulgaris Daucus carota Phaseoulus vulgaris Rheum rhabarbarum	Squash and melons Beet Carrot Bean Rhubarb
*Vines*
Scientific Name	Common Name
Celastrus scandens Clematis spp. Lonicera Parthen. Quinquefolia	Bittersweet Honeysuckle vine Vinginia Creeper
*Trees*
Scientific Name	Common Name
Acer palmatum Acer reubrum Carya spp. Catalpa bignonioides Cercis canadensis Crataegus spp. Fagus grandifolia Juniperus virginia Liriodendron tulipifera Platanus occidentalis Prunus serotina Quercus alba Robinia pseudoacacia Tsuga canadensis Ulmus americana	Japanese maple Red Maple Hickory Catalpa Redbud Hawthorne Beech Red cedar Tulip tree Sycamore Black cherry White oak Locust Canada Hemlock American Elm
*Shrubs*
Scientific Name	Common Name
Berberis canadensis Cornus spp. Cydonia oblonga Forsythia Hibiscus syriacus Lonicera tatarica Potentilla Rhododendron (Exbury hybrids) Ribes aureum Ribes spp. Rhus glabra Rosa multiflora Sambucus canadensis Syringa Viburnum acerifolium	American barberry Dogwood Quince Rose of Sharon Tartarian honeysuckle Clove currant Currant & gooseberry Smooth sumac Multiflora rose Common elder Lilac Maple-leaf viburnum
*Other*
Scientific Name	Common Name
Festuca arundinacea Mentha spp. Poa pratensis Rubus occidentalis Taraxacum officinale Trifolium repens	Tall Fescue Mint Kentucky bluegrass Black raspberry Dandelion White Clover

*List compiled by Ann Munson, Dane Co. Extension Master Gardener from the following sources:

"Effect of Black Walnut Trees and Their Products on other Vegetation," Bulletin 347, West Virginia University Agricultural Experiment Station
"Under the Black Walnut Tree," by Frank Robinson, Horticulture Magazine, Oct/ 1986, p. 30-33.
"Allelopathy," by Teresa Boes, American Nurseryman, January 15, 1986, p. 67.
"Plant against Plant," Elen M. Silva, Extension Technician, Dept. O Horticulture, in Virginia Gardener Newsletter, Vol. 8, No. 4
Gardener Betsey McKinney, who gardens intensively under Black Walnut trees

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