Plants Resistant to Walnut Toxicity
Black walnut trees produce a toxin (juglone) which kills or stunts plants near them. Juglone is expelled through the roots stems, leaves, and nuts. Gardening near Walnut trees can be more difficult, but in no way is it impossible.
Cleaning any tree debris underneath the tree can be one easy way to limit the exposure to juglone to plants which are outside the drip line of the tree. Do not use any walnut tree debris for mulching or amending your soil as you may contaminate the surrounding area.
Sometimes you can place a wood, plastic, or concrete barrier to separate the trees roots from the roots of the plants you wish to plant near a walnut. Barriers can also keep tree roots away from larger garden spaces.
An ounce of prevention is worth a pound of cure when it comes to creating a garden near walnuts. Here is a list of plants which are less susceptible to juglone and can take some of the trial and error out of your garden.
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Perennials:
Ajuga/Bugleweed
●Alcea rosea Hollyhock
●Astilbe sp. Chocolate Chip Ajuga Astilbes
●Campanula latifolia Bellflower
●Chrysanthemum sp. Hardy Mums
●Gallium odoratum Sweet Woodruff
●Geranium sanguineum Bloody Cranesbill
●Helianthus tuberosus Jerusalem Artichoke
Daylily
●Hosta Hosta Albo Marginata Hosta ●Iris siberica Siberian Iris
●Monarda didyma Bee Balm
●Oenothera fruticosa Sundrops
●Onoclea sensibilis Sensitive Fern
●Osmunda cinnamomea Cinnamon Fern
●Phlox paniculata Garden Phlox
●Polemonium commutatum Jacob's Ladder
●Primula x polyantha Polycanthus Primrose
●Pulmonaria Lungwort
●Sanguinaria canadensis Bloodroot
Goldmoss
●Sedum specable Sedum Starfire Phlox ●Stachys byzantine Lamb's Ear
●Tradescantia virginiana Spiderwort
●Trillium grandiflora Trillium
●Viola Violets
Vegetables and Fruits:
●Daucus carota Carrots
●Phaseolus vulgaris Beans
●Rubus occidentalis Black Raspberry
●Zea mays Corn |
Trees:
●Acer Palmatum Japanese Maple
●Acer palmatum var. dissectum Cutleaf Japanese Maple
●Catalpa bignonoides Common Catalpa
Redbud
●Cydonia oblonga Quince Red Japanese Maple ●Juniperus virginiana Red Cedar
●Tsuga canadensis Canadian Hemlock
Shrubs:
Clematis
●Forsythia Forsythia Karl Saxe Forsythia ●Hibiscus syriacus Rose of Sharon
●Lonicera tatarica Tartarian Honeysuckle
●Parthenocissus quinquifolia Virginia Creeper
●Rhododendron 'Exbury Hybrid' Exbury hybrid Azalea
Annuals:
●Begonia sp Begonias
●Calendula sp Calendulas
●Ipomoea sp Morning Glory
●Viola cornuta Horned violet
●Viola x wittrockiana Pansy
Bulbs:
●Crocus sp Crocus
●Muscari sp Grape Hyacinth
●Narcissus Daffodil
●Scilla siberica Blue Squill
●Tulipa Tulip
Turf:
●Poa pratersis Kentucky Bluegrass
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