'Ogon' outside in the winter has not survived for me even in a relatively protected site with some mulch cover. Temps dropping into the upper 20sF have damaged the growth, though those didn't kill it outright. I'm in zone 7b. There is continual heat/cool temps fluctuating in the winter months and never any snow cover. Those may be a factor in the lack of survival here. We usually have at least one cold snap that gets into the lower teens and occasionally into single digits. Whatever the reasons, when spring returns 'Ogon' has not been there to see it. I bring mine into the garage or on the closed in porch, though I often have it outside when temps are staying above 32F.
