The experiment shouldn’t be interpreted as proof that every banana placed in a jar will remain perfectly fresh for exactly 16 days.
Bananas do not all begin at precisely the same stage of ripeness, and storage conditions can vary. Refrigerator temperature and the condition of the individual banana can influence the outcome.
The claim is therefore best understood for what it is: the reported result of Cross’s particular storage experiment.
What makes the idea useful is its simplicity. It involves leaving the peel intact, putting the banana half into a sufficiently large glass jar with a lid, and refrigerating it.
It also offers an alternative to simply leaving every banana in a fruit bowl until the bunch becomes increasingly brown.
If bananas regularly ripen faster than you can eat them, paying attention to where and how they are stored can make sense. Keeping a fruit bowl away from obvious heat sources such as a sunny window, oven, stovetop, or radiator can help avoid conditions that encourage faster ripening.
It is also worth remembering that other ripening fruits in the same bowl can produce ethylene. Apples, pears, and avocados are among the other climacteric fruits mentioned, so a mixed fruit bowl creates different storage conditions from keeping bananas on their own.
The glass-jar experiment takes a different approach by combining a container with the cooler environment of the refrigerator.
Cross’s result is striking because of the contrast she reported after 16 days: the refrigerated half remained relatively bright yellow, while the room-temperature banana showed substantially more brown and dark spotting.
That doesn’t turn 16 days into a guaranteed shelf life, but it does make the experiment an intriguing option for anyone tired of watching a bunch of yellow bananas become brown and soft before they can be enjoyed.
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