Answer: Deep watering will encourage deeper rooting (shallow watering will keep roots close to the surface where moisture is abundant), so it's possible that's what has happened to your cedars. Emerald cedars tend to have shallow feeder roots, so I don't think there is any cause for alarm, but I would certainly begin watering deeply but infrequently to encourage deeper root growth. Shallow roots are more prone to physical damage, and to overheating when weather is hot. Don't cover the roots with additional soil, but do place a 2-3" mulch over the soil surface to help moderate soil temperatures, slow evaporation, and suppress weeds. Best wishes with your cedars!
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