Answer: Most evergreens do better if planted in the spring so they have ample time to become rooted and somewhat established before the cold weather hits. If they are not fully rooted, they are less able to take up moisture and are more prone to drying out in sun or wind once the ground is frozen. Based on your description I suspect they are drying out due to inadequate rooting before the ground froze, combined with the stress of winter southern sun exposure. It is possible the trees are dead or nearly so, so you should probably consult with your retailer. I'm sorry I can't be more encouraging.
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