Red top photinia

Question

Can you trim red top photinia that have basically turned into trees — back to 3 feet in height, and have them survive?

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Answer 1

You can hard prune these shrubs.
I do suggest though that you prune 1/3 of the shrub at each turn.
https://www.gardeningknowhow.com/ornamental/shrubs/photinia/rejuvenating-red-tip-photinia.htm