Whether ornamental or not, all banana plants will produce flower, and they can mature to fruit. I grew one that gave me sweet "apple" banana. Just realize that once your tree flowers, it will die, but they produce suckers or "pups" that will take their place. If not maintained, they will take over a space, so be prepared. My oranmental banana plant came from Home Depot and I created a tropical micro climate for it. Good luck!
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Can You Grow Ornamental Bananas in Western Washington?