What can I do about slow growing holly bushes?

Question

I have 1 male holly bush that is beauiful and large. There are 6 female bushes. They grow the red berries on them but they are so small and do not seem to get much bigger. I got them all at the same time. They all get the same amount of sun.

Answer 1

Try feeding with chicken pellets. Available Garden Centres & not expensive. Regards. UK

Answer 2

Sounds like they need fed. Use Holly-tone. Big garden centers should sell it.