Re: Musa Basjoo in zone 8b
They should be putting out a new leaf every five days or so, so yes, they are languishing. I've seen bananas in San Diego that went through the same problem. If there is a way to keep them out of the direct sun, you're going to be much better off. 37c is like 85 degrees here, so it's not that hot, but low humidly is definitely not good.
If you can get some shading over the plant to reduce the direct sun, and place something over it to help keep humidity in, you can put a container of water next to it. The evaporation will stay contained under the cover like a miniature greenhouse, but you must reduce the sun first!
In your area, the stem will die back, but all the way to the ground. It should stay around three feet or so. bananas spread, so don't worry about the mother p-stem dieing back. By then, it will have pupped and begun spreading.
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