This bronzing coloration is a symptom of winter injury, which is not uncommon in evergreens at this time of year. You will find information about it here on our website.
The foliage colors will revert back to normal when springtime temperatures warm up consistently and the plants will begin to put out new growth. Since these are newly planted shrubs, be sure to keep them well watered during dry periods, as the root systems are still getting established.
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