I have a wide double row beech hedge. How and when can I cut it back severely ? One row grows towards the front, and the other to the back. The middle of the hedge is like an empty "tunnel".If I cut back one side I will leave the trees on that side with hardly any leaves. Would there be a danger that this may kill the row, or should I remove one row altogether ? It has become difficult to trim as it's about 6 ft.6in. tall and about 4 ft.6in. wide in places.
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