United Kingdom 
when do you prune hard back an old beech hedge. two foot needs to be cut back
15 Nov, 2009
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hedge plants
Answers
we did ours in february and we took it down by 3/4 to 12 ft. it has survived very well. the fence got damaged when a big heavy bit snapped its ropes. :o)
15 Nov, 2009
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The RHS has a very explicit answer to your query. Type in renovating old hedges.They suggest midwinter for deciduous trees.
15 Nov, 2009