That is normal. Those are the male flowers falling off after the female/bisexual flowers have already formed and begun forming parthenocarpically (without pollination). In wild bananas the male flowers are only present for a few days at most then when the pollen is no longer viable the flowers fall off, in edibles, even though the male flowers are sterile and in most cases no pollen is present, they still do the same thing. In order to get more hands of female flowers you would really need to manage the mat by taking off pups and really feeding them well thru out the season.
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Growing bananas in Colorado, Washington, Hawaii since 2004. Commercial banana farmer, 200+ varieties.
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