8 years ago
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Landscaping and Gardening Around Walnuts and Other Juglone Producing Plants (w/ list of juglone-tolerant plants)
Walnuts and hickories produce the chemical juglone (5 hydroxy-1,4- napthoquinone), which is exuded from all parts of the plant. The greatest concentration of juglone and hydroxyjuglone (a nontoxic, colorless precursor that is converted into the toxic form juglone by sensitive plants and through oxidation) is found in the vegetative buds, leaves, stems, nut hulls, and roots of the plants.
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http://extension.psu.edu
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I have a big, beautiful walnut tree in my backyard. I love it, but it prevents me from growing many things under or near it. This article and list have really opened up a lot of possibilities for me, so I thought I'd share in case anyone else has struggled with juglone in their gardens.
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