Answer: Root rot has more to do with poor drainage than excessive irrigation. When roots sit in soggy soil, they suffocate from lack of oxygen. This can happen through irrigation in the summer or high levels of rainfall in the fall and winter months. To save your remaining hydrangeas you may have to improve the drainage either by installing a curtain drain or planting your hydrangeas in a raised bed (which facilitates good drainage). Best wishes with your hydrangeas!
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