Re: Cold hardy Container Bananas??
Don't see how it could have frozen since you state that the indoor temp was 60. Strange. I would say the more likely culprit is rot, especially if you are seeing leaves fall off.
It will be very difficult for you to find a hardy banana if you want to leave it outdoors in the pot all winter. Anything in a pot is more prone to freezing than if it is in the ground because the root system is above ground and the air circulating around the pot is cold. Bananas and anything tropical in nature will be especially prone to freeze damage if left in a container and outdoors during the winter. As Bryan, mentioned, bring it indoors if you have the room.
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