fertilizer injury

Fertilizer Injury on Dogwood

This digital image of dogwood arrived with the e-mailer asking if the problem was leaf scorch.   Damage seemed too great and too complete to be simple leaf scorch due to some transient heat stress. Further information indicated that someone had suggested that the plant needed potash and the e-mailer applied it and then asked if too much could be applied.  Well, yes. As with anything, even something as useful as fertilizer, “the dose makes the poison.”


The sender had applied 2 pounds of a 6 pound bag of a consumer-product potash (0-0-60) fertilizer. So at 2 pounds...

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Jim Chatfield