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Roses, Clematis and Peonies
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Glossary ListGlossary Term 
Juglone
Why shouldn't you plant roses near walnut trees? Well, Doc & Katy Abraham in their book, Green Thumb Wisdom: Garden Myths Revealed! say, black walnuts produce juglone, which "tells" other plants to "stay away."
See also, Companion Planting.
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