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walnut trees and vegetable gardens

I have a sunny area that is suited for vegetable and flower gardens, but it is surrounded on two sides by walnut trees. Last year nothing did well at all. Are the walnut trees detrimental to growing other things?
Submitted by BHGPhotoContest

Black walnut trees produce a substance that can inhibit the growth of other plants. Usually the effect of this substance is within the drip line of the tree, but leaves and other tree parts that fall on your garden could be hurting the growth of your plants.

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Can i add anything to the soil next to where a black walnut used to grow? The tree is cut down but the stump remains,but still no vegies will grow in the proximaty
Submitted by rockmiller12