Field General,
The what you are seeing on your boxwoods is a natural thing. In the spring, they will turn green again. If you do any plantings, instead of using Korean, try the Wintergreen Boxwood. It has a lower temp tolerance and it stays green..... dark green. There is a post from 1-3 weeks ago that mention this. use the search, cause i think someone has a concoction to reverse this browning. Like i was saying above, the browning is nothing serious, just unsightly. Hope this helps.