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Frost Damaged Photinia

This is my frost damaged Photinia. I planted the hedging in September 2021 and it survived that winter and looked in perfect condition in autumn 2022 with lots of new growth. But after this winters frosts, it got to -8 over several consecutive days the leaves all seemed to die back. Is there any hope for the plants. Should I cut them back and hope for new growth, any ideas?
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It certainly doesn't look very happy but someone with the. knowledge will be able to advise you.
Also the aspect - windy/exposed is another thing they don't tend to like.
I live in west central Scotland - not where that photo is...
They either look like that, or covered in black spot when planted in wet sites.
The previous winter, when you planted them. was the mildest driest one I can ever remember, and I'm not young. Unfortunately, we also then had the hottest summer on record. That combination meant they wouldn't have been well established enough to cope with the wet/freeze of December and March, even if minus 8 was the lowest you had there.
I live in west central Scotland - not where that photo is...