I had a Boxwood not do well in the spring. It was sitting side by side next to another one, they could be twins. One of the two died back during the spring and I was not sure why. I have had both for a long time. I just ran across an an article about Boxwood Blight (Calonectria pseudonaviculata) that can devastate or out right kill your Boxwood Bonsai. I cleaned the tree up and put it on the bench, a couple more branches died, but it is still alive. I am not totally sure my Boxwood has this blight, but I thought I would add these valuable articles (4 total) to my Boxwoods page, shown under Deciduous Bonsai and Bonsai Tree Information.

Photo courtesy of Midwest Bonsai Society.