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The Problem with Black Walnuts
First Published in The Landscape Contractor magazine “What You Don’t Know About Walnuts Can Hurt Your Plants” By Becke Davis How many times have you planted perfectly healthy trees or shrubs into an existing landscape, only to have them die for no apparent reason? When that happens, do you call in a specialist from the County Extension Service you diagnose the cause of death? Do you have an arborist check out the remains of the plant? Or do you just bite the bullet and resign yourself to the inevitable loss of a few trees and shrubs? Nine times out of ten, you’d be safe to do that, but the 10th time you could be letting yourself in for a repeat performance. There are a number of reasons why a relatively new plant can die -- planting too deeply (although that usually causes a slower death), herbicide contamination, insufficient watering, root burn from over-fertilization, rootballs sitting in water that won’t drain, and so on. When you are running down a checklist of possible reasons fo...
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