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Help with leylandii please
My neighbour asked if he could trim our leylandii and this is the result. We would like to keep it but obviously not as it is on the top. Any ideas or suggestions please to rescue or camouflage the damage. Thanks

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Or failing that, how wide and high is it?
It is hard to tell from the angle you took the photo.
It looks like it is brown and those bits will not grow.
However, it is possible that keeping the sides well trimmed and the top at about the same height you may be lucky and new side growth could be trained to cover it gradually.
If you are lucky there may be some bits with tiny bits of green left.
Can you see any?
If there are even small bits they can and will grow, but take time.
If it is going to be an ongoing problem I would bite the bullet and replace it now with something like Yew or Thuja which will grow from old wood.
The lesson there is - don't let neighbours do your garden
An instant hedge will certainly be very pricey, and then you have the problem of removing that hedge, properly prepping the ground as it won't be great, and then being vigilant over a good length of time to get the new one established. That isn't easy with a mature hedge. At this time of year you can get bare root hedging, and depending on what you chose - that will establish well and grow to a decent size within a couple of years, with a lot less effort.
I live in west central Scotland - not where that photo is...
The fence was in the neighbour's garden, they are redesigning theirs at the moment and have removed the fence and are putting decking down. Our garden is the other side of the hedge, behind our neighbour's garden at a lower level. Hope that makes sense! I do appreciate your comments.
Sorry,.
What you need to do is let any pieces of growth near the top and heading in the right direction grow on a bit to cover the brown, prune the tip so it will branch and spread.
The rate that they grow it should not take that long.
If you really want to keep this hedge then a year or so with it looking a bit scrappy at the top is not so bad?
I don't think it will take long.
I wish I could gauge or tell you how long to leave the bits that head in the right direction, maybe let whatever grows around a quarter to half way then prune the tip so the rest of it branches and spreads sideways over the top.
Keep checking and doing this until it gets covered.
You know which side grows the most, usually the south side of any hedge is more vigorous so let the more rampant side/direction grow across while still trimming the rest as usual.
Of course any pieces that grow in the right direction are good, so you will just have to look and see what does, then prune to make it branch.
Yes, our garden wraps around our neighbour's garden, and is at a lower level than theirs so we can't see the top from our garden but we can from our house!
We are not gardeners (sorry) so I really do appreciate your helpful comments. I only wish you lived near enough to help with the practical recovery!