Re: Musa mannii in zone 8a
Frank I too have a musa Mannii but no way can I leave mine out. I think it's a very underated banana.
Mine seems to have a darker stem than yours and it also has little crinckly bits on the petioles.
Keep us posted on the flower as it will be nice to see what it looks like.
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Time Flies like an Arrow.....Fruit flies like a Banana. 
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