

I have inherited an untidy yew hedge which has been neglected for some time. There is greenery on the outside but the inside of the hedge which is about 2.5 feet wide in places is completely dead. I have been considering taking it right back to the trunk in the hope that it may grow denser and therefore look better eventually. Other than that I don’t really know what to do with it. Any help / suggestions greatly received. Removing it isn’t an option by the way.
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A light trim all over and a good feed/ mulch / water will pay dividends and encourage new growth.
and this is what it looks like beneath the surface greenery which is just a couple of inches thick if that
So don't worry about it being 'dead inside' ... that is perfectly natural and as it should be ... and it will provide wrens and robins etc with marvellous shelter during the winter.
In the meantime you can cut your hedge right back close to the trunk if you want to ... it'll soon regrow ... but as @Hostafan1 has said, a good trim, followed by a feed (Fish Blood and Bone will be great) followed a good watering (this suimmer's drought has effected everything) and then by mulching with some organic matter and it'll soon be a great hedge ... then just regular trimming will keep it looking great.
When you trim it try to shape it so that it's slightly 'A' shaped ... a little wider at the bottom than at the top ... that the bottom of the hedge gets as much sunlight as the top and the growth will be more even, rather than having a hedge with 'bare legs'
A yew hedge is, in my opinion, absolutely the best hedge you can have ... you're very lucky ... I envy you.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Cut yours back as hard as you need to get the size and shape you want then give it a good drink and maybe some bonemeal which will promote root and plant health but not soft sappy new growth which will be damaged by winter frosts. Next spring, give it a good general feed of blood, fish and bone or pelleted chicken manure.
The RHS says spring is the best time to renovate a yew hedge so maybe for now just give it a good trim to tidy it up - https://www.rhs.org.uk/advice/profile?PID=729
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw