Best food for Photinia Red Robin?

[Lee777]

Hi Guys,

I have planted Photinia 'Red Robin' in a garden bed I filled with gp potting mix.

They look to be struggling a bit, although they are around 24 months old and fairly well established. What product would you recommend giving them to get them well fed and looking well?

Thanks,

Lee

[Lee777]

Thanks for your detailed response, Eric, much appreciated.