Your question suggests you have dug up a Photinia red robin and now wonder when's the best time to replant it? But perhaps you mean, when can I dig up my Photinia and move it somewhere else? October, where you live, if that's what you're asking. On the other hand, if you mean you have a Photinia in a pot and want to know when you can plant it, now. I can't think of any other possible meanings of your confusing question, Guest.