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Walnut/Black Walnut Leaves, Juglone, and Composting
A couple of autumns ago (in the northern hemisphere, just in case that matters), someone advised me to be very cautious about composting leaves I collected from the curbside, where homeowners in my community place them for collection by the city. (I'm only collecting from my street, just so you now that, too.) We have a number of walnut trees in
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mamculuna
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virginiadear
From what I've understood about walnut/black walnut toxicity to other plants, it's the roots of either type of walnut (Persian or black) which contain the greatest concentration of the juglone. If you look in the lists below the main text of the article, there is a compilation of plants which can not grow within fifty feet (50') of the drip line of a black walnut.
The toxin breaks down with exposure to air, water and bacteria, all of which have to be present in a compost pile, which means that with composting the leaves can be applied safely to your flower beds and herb and vegetable gardens and your shrubs.
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mamculuna
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