photinia red robin no longer produces red leaves

[Donmaico]

I have a rather large one which got a bit out of hand so a couple of years ago I cut the sides and top quite considerably.Since then any new growth has been at best a sort of greeny pink colour but certainly not the bright red it once was .Can someone enlighten me as to what i can do to return it to its former glory?

[David E. Ross]

It might be the soil or a lack of some nutrient. I would cut one of the pink shoots and take it to a good nursery (not a hardware store or lumber yard) for diagnosis.