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Walnut Toxicity
Black walnut roots release a toxin called Juglose that prevents many plants from growing. Plants
that are susceptible to the toxicity and usually die slowly (by gradually wilting) include:
Tomato
Alfalfa
Pear
Blackberry
Red Pine
Blueberry
Mountain Laurel
Azaleas
Rhododendron
Potentilla
White Pine.....Other evergreens may be affected.
To avoid injury, susceptible plants should be place at least eight feet past the walnut tree's
dripline.
Walnut sawdust or wood chips have been shown to affect plants in a similar fashion and should
not be used as a mulch around these plants.
BULBS AND BULBOUS PLANTS NOT AFFECTED
The following is a list of bulbs and bulbous plants that appear NOT affected by the toxicity
released by walnut roots.
Chionodoxa (Glory-of-the-snow)
Crocus
Endymion (Spanish Bluebells)
Eranthis (Winter Aconite)
Galanthus (Snowdrop)
Hyacinths
Muscari (Grape Hyacinths)
Narcissus (Daffodils)
Scilla (Blue Squill)
Tulips
Shrubs and vines that do not appear to be affected
Japenese Maple
Canadian Hemlock
Clematis,
Forsynthia, Rose of Sharon
Honeysuckle
Virginia Creeper
Rhododendron Exbury Hybrids
Calendulas
Morning Glory
Pansy
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PERENNIAL PLANTS NOT AFFECTED
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last updated September 18, 1996
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