AllenF

They should be okay. I have had mine outside days for over a week with them going inside my garage at night. Two days ago I began leaving them out overnight as well. They have survived 3*C/37*F with a little wind & sun damage.

Make sure that you gradually expose them to increased amounts of sunlight. They sunburn easily.

Allen

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You don't have to be crazy to grow Bananas in Alberta, but it helps