Answer: Daily watering is a little too much for your boxwoods. When the soil remains too wet it can suffocate the roots. Instead of watering daily, take them off the drip system and water them by hand until they recover. One deep soaking a week - two if the weather is really hot and the soil drains quickly. Try watering them deeply then waiting 3-4 days and poking your finger into the soil. If it is still moist one inch below the surface, don't water for another few days. If the soil is dry, it's time to water. Hope they recover soon!
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