Avoid Buying Bananas That Are Missing This Key Feature - Tasting Table
Briefly

Many overlook the importance of the neck of a banana when making a purchase. An intact neck helps protect the banana's inner flesh from oxidation and pest invasion. If a banana's neck is damaged, the flesh oxidizes quickly, becoming unappealing and vulnerable to bacteria. USDA guidelines suggest not leaving exposed fruit out for more than two hours. If you end up with damaged bananas, separating them from the healthy ones can mitigate spoilage, provided they show no signs of disease or rot.
"Most people's answer would probably be 'never' when asked about the kind of banana they buy, yet an intact neck is crucial for keeping them fresh."
"The neck of a banana acts as a protective 'cap' sealing off the inner flesh from the outside environment, preventing spoilage."
Read at Tasting Table
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