I have a griselinia hedge lined avenue which is 30 odd years old it has formed an arch which I would like to maintain. the only problem is it seems to be dying on me. I have tried to cut out as much dead wood as I can. It has new shoots but these quickly loose their leaves and become bare and also brown or black at the tips. What could I do it would be a shame to loose this beautiful feature. Is pruning an option because these are now more trees than shrubs. thanks
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