Avoid Plants That Don't Get Along
by Mary Tebo, special to HGTV.comSome plants are especially good at beating the competition---by allelopathic ways. To have harmony in the garden, avoid these plant combinations: Beneath black walnut, avoid pines (unless in well-drained soils), birch, crimson clover, crabapple (or edible Malus sp.), alfalfa, Sericea lespedeza, tomatoes, lettuce, honeysuckle
Goldenrod beneath sugar maple, tulip poplar or black cherry
Kentucky bluegrass or red fescue around azalea, barberry, yew, forsythia or dogwood
Perennial rye around apple, forsythia or flowering dogwood
Sassafras beneath boxelder, elm or silver maple
Black cherry with pine or red maple
Sweetgum under southern red oak--Information provided by William E. Klingeman, Plant Sciences Department, University of Tennessee
These plants apparently tolerate black walnut: Japanese maples (Acer palmatum and its cultivars)
Southern catalpa (Catalpa bignonioides)
Eastern redbud (Cercis canadensis)
Canadian hemlock (Tsuga canadensis)Vines and shrubs
Euonymus species
Weeping forsythia (Forsythia suspensa)
Tartarian honeysuckle (Lonicera tatarica), and most other Lonicera) species
Virginia creeper (Parthenocissus quinquefolia)
Black raspberry (Rubus occidentalis)
Arborvitae (Thuja sp.)Annuals
Pot-marigold (Calendula officinalis) 'Nonstop'
Begonia, fibrous cultivars
Morning glory (Ipomoea) 'Heavenly Blue'
Pansy viola
Zinnia speciesVegetables
Squashes, melons, beans, carrots, cornFruit trees
Peach, nectarine, cherry, plum
Prunus species, pear (Pyrus sp.)Herbaceous perennials
American wood anemone (Anemone quinquefolia)
Jack-in-the-pulpit (Arisaema triphyllum)
European wild ginger (Asarum europaeum)
Astilbe species
Spring beauty (Claytonia virginica)
Crocus species
Dutchman's breeches (Dicentra cucullaria)
Grasses Gramineae, most)
Common daylily (Hemerocallis) 'Pluie de Feu'
Hosta lancifolia
Hosta marginata
Hosta undulata 'Variegata'
Showy sedum (Sedum spectabile)
Lamb's-ear (Stachys byzantina)
Spiderwort (Tradescantia virginiana)
White wake-robin (Trillium grandiflorum)
Plants that don't grow within 50 feet of drip line of black walnut:Herbaceous perennials
Colorado columbine (Aquilegia caerulea)
Wild columbine (Aquilegia canadensis)
Hydrangea species
Lilies (Lilium) species (particularly the Asian hybrids)
Alfalfa (Medicago sativa)
Peonies (Paeonia sp., some)Trees
Silver maple (Acer saccharinum)
White birches (Betula)
Northern hackberry (Celtis occidentalis)
Apples and crabapples (Malus sp.)
Norway spruce (Picea abies)
Red pine (Pinus resinosa)
Eastern white pine (Pinus strobus)
Basswood (Tilia heterophylla)Shrubs
Hydrangea species
Mountain Laurels (Kalmia sp.)
Privet (Ligustrum species)
Amur honeysuckle (Lonicera maackii)
Rhododendrons and azaleas (Rhododendron sp., most)
Blackberry (Rubus allegheniensis)
Lilacs (Syringa species and cultivars
Yew (Taxus)
Blueberry (Vaccinium corymbosum)Annuals and vegetables transplants
Cabbage (Brassica oleracea capitata)
Peppers (Capsicum species, some)
Tomatoes (Lycopersicon esculentum)
Flowering tobacco (Nicotiana alata)
Petunia species and cultivars
Eggplant (Solanum melongena)
Potato (Solanum tuberosum)
double-flowered cole vegetablesSource: Funt, Richard C., and Martin, Jane. (1993), Ohio State University Extension
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