Best Hedge Trimers for Pleached Trees?
I have 6 hornbeam trees against a wall in the back garden which are grown to create a "hedge of stilts". They are now getting to the point where I need to start shaping them into a neat hedge, but I am not sure what hedge trimers to get. Ideally I need something that could be extendable to keep the sides neat right to the top (probably about 3-4 metres tall). Does such a thing exist - or do I need to call in the tree surgeons? Advices please.