Answer: The chemical substance manufactured by walnut trees is called juglone. When the roots of susceptible plants come into contact with walnut roots, they can be stunted or killed. Walnuts are deep-rooted trees, and this fact may enable you to plant annualsnearby as long as they have shallower roots. Try raising the soil level in your garden by adding topsoil to give your plants a deeper root zone. There isn't anything you can add to the soil to counteract the juglone.
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