juglone tolerant vegetables - Gardening Tips
Add Yahoo as a preferred source to see more of our stories on Google. MariaBrzostowska / Getty Images Juglone is a naturally occurring toxin released by certain plants to limit competition by damaging ... Juglone is an allelopathic compound, a substance produced by a plant to stunt the growth of another plant.
Understanding the Context
Juglone affects germination of plants less than it affects growth of the root and stem systems. Walnuts and hickories produce the chemical juglone (5 hydroxy-1,4- napthoquinone), which is exuded from all parts of the plant. Black walnut trees produce a toxic substance (called juglone) that prevents many plants from growing under or near them. Learn more about this compound and how to work around it in this factsheet.
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Key Insights
Juglone is a naturally occurring chemical compound that certain trees release into the soil to protect themselves from plant competition—a process known as allelopathy. The commonly held belief is that walnuts and other trees in the genus Juglans produce a chemical called juglone, and it is this chemical that affects other plants. It turns out that walnuts don’t produce juglone, or at least not very much of it. Instead, they produce a chemical called hydrojuglone. Juglone is a quinone compound that exerts an inhibitory effect on the rooting ability of certain plant cuttings, such as pecan and walnut, and its effects can vary depending on the species and concentration used.
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What Is Juglone? Although the black walnut has many uses and benefits, the tree does come with a caveat: the black walnut’s roots, which may extend 50 feet or more from the trunk, exude a natural herbicide known as juglone. This substance is also found in the tree’s leaves and fruit husks.