If you’re referring to the popular tip that one kitchen item can make bananas last dramatically longer, the trick is usually plastic wrap around the banana stems.
Bananas naturally release ethylene gas, which promotes ripening. Wrapping the stems can slow the movement of ethylene somewhat and may help bananas stay fresh a little longer.
How to try it
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Separate the bananas rather than leaving them tightly in a bunch.
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Wrap the stem ends with a small piece of plastic wrap.
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Keep them at room temperature, away from direct sunlight and other ethylene-producing fruit.
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Once they’re as ripe as you like, you can refrigerate them. The peel may darken, but the fruit inside can remain good for longer.
Important: There isn’t good evidence that this method reliably makes bananas last exactly 10 days longer. The amount of extra time varies considerably with ripeness, temperature, and storage conditions.
