Re: bananas in outdoor greenhouse
As far as what is the minimum temp bananas will continue to grow...
I'm sure there will be variation between varieties, but... From my experience and what I have read, 55F seems to be the temperature at which growth stops. That doesn't necessarily mean you need to keep the greenhouse at 55F at night. You may still get growth with lows in the 40s if the daytime temps are warm enough.
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Adam 
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