I grew this Musa glauca from seed several years ago. Supposedly hardy, I sacrificed his sister to the winds and snow to find out just how tough she was and sadly found absolutely nothing in her place the following spring. Hardy in the land of ice and snow is a relative term.
For those of you who like to grow bananas, but don't have a tonne of inside room, I have found that this method has worked well for me over the last 3 years or so:
Dig up the plant.
Remove all but the top leaf.
Shake off quite a bit of soil.
Dump in a brown paper refuse bag.
Store in basement until first frost free day.
Stick in garden and watch it start to grow all over again.
The only note of caution is that Musa glauca stains terribly - it is impossible to remove the dark brown sap stains from clothing. I tried this storage method with tinier plants and did not have as much success - although the poor things were sitting next to the furnace all winter - I suspect cooking them would be considered a poor horticultural practice.