Answer: Photinia is only considered reliably hardy in zone 7, however I too have seen a few apparently thriving in what is shown on the map to be zone 6 locations. I think microclimate is responsible for this. The plants I have seen are in very sheltered urban locations where it may actually be the equivalent of a zone 7. So whether or not you can grow one successfully will be a gamble. These plants grow several feet a year when they are well sited and well established. It will take some time for it to develop caliper and that overall tree-like look, maybe a decade. Privet grows at the same rate but most cultivars are more winter hardy. I hope this answers your question.
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