How did it happen? Looks as though the hedge was continuous and then something went through it, a section was taken out (hence the deadwood in the middle) and new planting (cotoneaster) has gone in at ground level and has yet to make any height. Is this a correct analysis?
It looks as if it's been clipped into the brown wood ... the interior of a hedge is always brown. I would clear the base of the hedge of any weeds, dead leaves etc, give the hedge a good feed of a general fertiliser like Fish, Blood & Bone, a generous soaking with water and a mulch of compost or similar. With any luck the brown branches at the end of that hedge will respond to the increased light and develop buds and new leaves.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
As mentioned, if it's only recently been clipped back, you will just need to keep it well watered and wait and see. They should grow back eventually.
It has also been pretty dry and hot this year. Even the winter time. The rain we have is still not enough for evergreen shrubs. Established shrubs can be vulnerable. It is possible, that section has died back due to drought.
You should try to prune further down to see if there will be regrowth. Water generously from now till autumn. If no re-growth in 6-8 weeks' time, it's probably had it.
Cotoneasters can sometimes get fire-blight. You would normally see leaves dried up still hanging on. But, if caught early, and you prune them back, they usually come back fine. So keep an eye on that too.
It looks to me as if something's been leaning against it for a while and blocked the light. Same effect as cutting into brown wood - what's exposed now hasn't had any light. Good treatment should help it to grow back either way, but it won't be instant.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Do you want to know how to sort it, or what has caused it, or something else?
I live in west central Scotland - not where that photo is...
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
It looks as if it's been clipped into the brown wood ... the interior of a hedge is always brown. I would clear the base of the hedge of any weeds, dead leaves etc, give the hedge a good feed of a general fertiliser like Fish, Blood & Bone, a generous soaking with water and a mulch of compost or similar. With any luck the brown branches at the end of that hedge will respond to the increased light and develop buds and new leaves.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
It has also been pretty dry and hot this year. Even the winter time. The rain we have is still not enough for evergreen shrubs. Established shrubs can be vulnerable. It is possible, that section has died back due to drought.
You should try to prune further down to see if there will be regrowth. Water generously from now till autumn. If no re-growth in 6-8 weeks' time, it's probably had it.
Cotoneasters can sometimes get fire-blight. You would normally see leaves dried up still hanging on. But, if caught early, and you prune them back, they usually come back fine. So keep an eye on that too.