What you see are suckers. They usually appear after flowering and fruiting when the main stem dies back. If you are certain that your main stem, a pseudo trunk, is in good shape, break or snap off the sucker by grabbing it at the soil line. Here is more info on Musa basjoo. http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=d442.
Answered on December 27, 2017
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