Will red-tip photinia survive the cold winters of southern Maine? How often does it need pruning?
Red-Tip Photinia in Maine
Certified GKH Gardening Expert
It will need protection in severe cold. They are generally hardy only to 0 degrees F. Growing zones for your state range anywhere from 3-5 (eastern parts include some Zone 6). This being the case, I would suggest growing the shrub in a container, which can be overwintered indoors, or the garage.
You can prune it back anytime between spring and fall, with late spring/early summer being the most ideal. This article will also help: