Answer: In my experience rosemary is somewhat difficult to overwinter indoors. (I do not think they would survive a winter outside in your area, especially as container plants. "Tuscan Blue" is hardy to zone 8 and you are only in the warmer part of zone 6.) They may be suffering shock from being moved inside to where the air tends to be very warm and dry. Or, there may be a pest such as spider mites or a disease such as mildew. It is difficult to diagnose this type of thing long distance. For general care guidelines, a bright location is fine. Take care not to overwater them as this can cause root damage which then eventually causes the foliage to drop. Also, a cooler room temperature is best, say 45 to 60 degrees. They also need good air circulation to help prevent fungal infections. If you think their location meets the above, then you might consult with your local county extension to see if they can give you a more precise diagnosis. Then, knowing that, you can determine how to proceed.
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