Watering too often can promote disease problems and if the soil stays soggy wet roots will die back from lack of oxygen. It is better to give a good soaking once a week or even less often. Mulch on the soil surface also helps. You are on the plant's southern limit but I would try making the change in the watering schedule. Starting next March fertilize it with a turf fertilizer such as 15-5-10 or similar product sprinkling a half cup around each plant throughout a 5 foot circular area around each bush. Repeat every 4 weeks for three more applications.
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