I have a 40 foot row of boxwood bushes. The tops are growing fine, but after this last winter (I am in Stoney Creek, Ontario, Canada), the sides seemed a bit burned, even though I cover them with burlap for the winter. The sides are becoming quite thin, and many of the small petal leaves are drying up, turning brown and falling off. I have a large amount of them on the ground. Can you help please?
Leaves Falling Off Boxwood Bush
If the shrubs were mine, I'd wait until spring, and give them a light shearing. This will promote new growth to fill out the thin spots. I've attached an article that should help: https://www.gardeningknowhow.com/ornamental/shrubs/boxwood/trimming-boxwood-bushes.htm