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.

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