I planted a a couple rows of boxwoods along my walkway about 18 months ago. They did fine until about 6-8 weeks ago when they started going brown. I have others planted a few years ago that a just a few feet awy and are doing fine. I can't understand what happened to these! Any thoughts much appreciated. Someone told me it might be insufficient nitrogen, so I gave them a mild dose of miracle grow a couple weeks back but t is pretty late in the fall.
As you can see, some shoots are tan/brown and others are still green. They are not dropping many leaves, even looking as unhealthy as they do. Will these plants die completely? Anything I can do to help them?