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The frost would take it out I'm sure even in a green house. Seems like the root system would be a cause for a great expense as well. I can look into it for maybe a project of experiment, but I am pretty sure I will have to admire from a distance :(

Some of my banana trees are over 30 feet tall and others only grow to 8 ft. I guess this would be a factor also for the requirements of the ceiling height and generally how much greenhouse space you would want to dedicate to bananas.