Answer: 'Winter Gem' boxwoods should retain their green color throughout the winter season. What you describe is unusual, but not unheard of. The bronze tint to the leaves sounds like either cold damage or a nutrient missing in the soil. Leaves that turn bronze with cold are generally those that have not had time to harden-off before a cold snap. It sometimes takes weeks and weeks for this type of damage to show up. The important thing to know is that all evergreens eventually lose their oldest leaves, which are replaced with healthy new foliage. Your boxwoods are no exception - after the leaves are shed they will be replaced. Now that your shrubs are developing new growth you can prune them back a bit to further encourage healthy new growth. Feed your shrubs this spring to ensure that the roots receive the nutrients they crave. Use an all-purpose liquid or time-release formulation(in amounts as recommended on the fertilizer package). I expect that your boxwoods will thrive this summer, prepare sufficiently for winter and sail through the cold months with green rather than bronzy or yellowing foliage.
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