Pancrazio

I have a greenhouse similar to yours apparently, unheated.
I have tried for two years to store dwarf cavendish potted in there. My absolute minimum inside was about 1°C and the winter here has maximum temperature that stay on average, outside, around 10-13C for 3 months. So inside the greenhouse the temperature must be pretty similar.
Well, the first year the DC was in great shape when putted in, lost all the leaves during the winter, and in March the pstem rot. Something says to me that the rotting pstem was already underway during winter and just completed as soon as the temperature raised a bit. All the roots died during the winter too.
Next year thing went ever worse. Not only the pstem died (even the next year, just in spring) but also the corm almost died.

Now what i do think is that DC can survive suck temperature only if they are brief. As long as they can last few weeks you are safe. If the are going to stay for months, DC will rot. It just can stand to stay idle, and it doesn't care if it isn't growing because cold, drought, lack of light.

(On the bright, DC grow very well indoor, it put 4 big leaves form me, from november to april, sitting at 1,5m from a east facing windows which was usually closed in the morning - pretty impressive, in my opinion)

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