Answer: All evergreens eventually lose their oldest leaves, which are usually replaced in a short time with healthy new leaves. It's normal for boxwoods to undergo some leaf drop and turning orange is the first step in this process. Cold nights typically trigger the color change (similar to tree leaves), and usually only the oldest leaves are affected. These leaves drop during the fall or winter (but sometimes hang on until spring). New growth then appears.
You can brush or hose these leaves from the shrubs if you find them unsightly, or you can prune them off. New growth should be a healthy green.
Hope this sheds some light on the problem!
Q&A Library Searching Tips