Question
I have dwarf boxwoods lining the foundation of my house. The leaves are yellowing, what is wrong?

Answer
A sign of nitrogen deficiency is yellowing of leaves, particularly older leaves inside the plant. I would fertilize the  trees with 10-10-10 fertilizer at the rate of 1 cup of fertilizer per bush scattered around the bush and  watered in good. Do this now and again in late summer.