Juglone-A toxic, natural, chemical defense mechanism of certain trees, e.g., walnut, butternut, to reduce competition for resources.
Juglone is produced primarily by walnut roots. The amount produced varies by species, and some individual trees make more juglone than others. It is not soluble in water, so it remains behind after watering or rain.
Juglone inhibits the growth of certain plants, especially those in the Solanaceae or nightshade family--as well as azaleas and rhododendrons, mountain laurel--even privet.
Contain juglone which can be toxic to plants. Add in small quantities, mix thoroughly; toxin will biodegrade in 30 to 40 days.
Weeds, pernicious
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The roots produce a toxic substance called juglone which inhibits certain plants to grow next to it. Tomatoes and earthworms are especially sensitive to juglone poisoning.
The roots of Black Walnut trees contain juglone, a substance that affects the growth of many plants. The roots of the trees can stretch many feet beyond the drip line of the tree. The plants may grow for a short time, then suddenly die.
All parts of the trees produce hydrojuglone, which is converted to an allelotoxin when it is exposed to oxygen.
Black walnuts produce a chemical called juglone, especially in their roots, that is toxic to many other plants.
Black walnut tree parts have a toxic compound called juglone, which inhibits the ability of many plants to acquire energy. Leaves from this tree and other poisonous plants are not good sources for leaf mulch or leaf mold.
The chemical responsible for its toxicity, called Juglone, remains in the soil around the tree and is most potent at the drip line, though the roots can spread out well beyond this.
 See also: Plant, Toxic, Wood, Soil, Growing
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