Doesnt get that cold here, tbf tho winters are getting milder, summers are getting hotter. Here anyway, plants that couldnt survive the winters are now surviving the winter. My Punica has been outside for must be at least 7 or more years. Ive had it in the ground two years and its thriving, produces flowers every season. but the previous owner kept it in a flower pot outside all year around. I took some thick hardwood cuttings almost 2 weeks ago, theyve been outside on my balcony, in a deep pot with a black bag over the top all through the heatwave, i checked today and the leaves are still fresh and there are new buds forming. theyre pretty hardy in my location and grow/thicken fast.