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csb: I planted a box hedge 12 years ago alongside my driveway. I had one plant leftover which I put in the back garden. This one has grown to a nice ball shape which I have trimmed over the years to about 60cm diameter. The hedge at the front is finally a hedge but only about 45cm tall and about 40cm wide. It has had brown bits in it and all sorts of issues. I cut the bad bits out and have made sure it gets water over the last couple of years it now looks good. I think your box needed a little less sun and a bit more frequent watering (euph?).
Isn't there some sort of box disease at the moment?