Why do some photinia bushes have prolific blooms and others have few or none?

Question

We have large photinia bushes that are covered with white blossoms and other bushes that have no blossoms only the red leaves. why is that?
I have no photos.

Answer 1

You could have some differences in nutrients in the soil.
This article will help you.
https://www.gardeningknowhow.com/ornamental/shrubs/photinia/red-tip-photinia-fertilizer.htm