That headline is likely referring to plastic wrap around the banana stems. It has some basis in how bananas ripen, but “10 days longer” is not a guarantee.
Bananas naturally produce ethylene, a gas that accelerates ripening. Covering the crown/stems with plastic wrap can reduce ethylene movement and may slow ripening somewhat.
A practical way to keep bananas fresh
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Keep unripe bananas at room temperature.
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Wrap the crown/stems with a small piece of plastic wrap; wrapping individual stems may work better than wrapping the whole bunch.
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Keep bananas away from other ripe, ethylene-producing fruits such as apples and very ripe pears.
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Once bananas reach the ripeness you like, refrigeration can extend the edible life. The peel may become brown or dark, but the flesh can remain good.
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Don’t expect a fixed extra 10 days—the result depends on temperature, banana variety, and how ripe they were when purchased.
So the kitchen-item trick is reasonable, but the viral headline exaggerates how predictable the result is.
