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Red Robin
I inherited an old, tall ‘Red Robin’ about 10 ft high. The lower branches have few leaves and look as if they won’t grow any new shoots. The upper branches have only a few healthy leaves and a lot of them drop off. Is it too tall to heavy prune. I am worried I won’t get any new growth if I do this but I can’t see a light prune helping. It would be very difficult for me to dig out Any advice welcome.
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If you have many branches below that are bare, it's a good time to prune them back. Although an evergreen shrub, they still shed leaves too and more so when conditions are less than ideal.
If you want to rejuvenate the lower branches, you will need to tackle the top sections. It will seem drastic and you will have a period of just bare branches further up, but there should not be a reason for leaving it the way it is, unless you want to create a standard type shape which is quite popular for photinias.
Prune them down by at least half its current height. It's nearly double the height of the back fence and can be catching the wind. Inspect the leaves. Are there any spots on the leaves. If yes, you will need to collect all dead and fallen leaves off from the area and lay new layer of compost of mulch. After cutting down the branches, feed the shrub. I doubt the shrub is fifty years old. These shrubs grow quite fast.
I would rather prune it down to test its ability than see it limp along like this. That's what I would do, it's up to you. Even on a south border, it can still be quite exposed from behind. I think the height needs to be reduced.