Pecan Tree Toxicity – Can Juglone In Pecan Leaves Harm Plants

By Amy Grant Plant toxicity is one serious consideration in the home garden, especially when children, pets or livestock may be in contact with potentially harmful flora. Pecan tree toxicity is often in question due to the juglone in pecan leaves. The question is, are pecan trees toxic to surrounding plants? Let’s find out. Black Walnut and Pecan Tree Juglone The relationship between plants wherein one produces a substance, such as juglone, which affects the growth of another is called allelopathy. Black walnut trees are fairly notorious for their toxic effects to surrounding juglone sensitive vegetation. Juglone does not tend to leach out of the soil and may poison nearby foliage at the circumference of twice the radius of the tree’s canopy. Some plants are more susceptible to the toxin than others and include: Azalea Blackberry Blueberry Apple Mountain laurel Potato Red pine Rhododendron Black walnut trees have the highest

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