A food storage specialist has shared a simple method that can keep bananas fresh for at least 16 days: placing a halved banana in a sealed glass jar in the fridge.
Bananas are known for ripening quickly, largely because many people store them incorrectly in the kitchen. The fruit is highly susceptible to ethylene gas, a plant hormone that most fruits emit as they mature. Keeping bananas in a fruit bowl alongside other ethylene-producing fruits such as apples or pears increases the gas concentration in that space, causing everything nearby to spoil faster.
Specialist's trial shows dramatic difference
Food storage specialist Amy Cross, who posts on Instagram as @thecrosslegacy, tested the method and shared her findings. In the trial, she bought three bananas, left two out on the kitchen worktop, and cut the third in half before placing it in a glass jar in the fridge.
After 16 days, the bananas left out were covered in brown and black spots, while the halved banana in the jar looked completely fresh, with bright yellow skin free from brown spots. Amy wrote on Instagram, "A jar keeps bananas fresh for 16 days!" and explained on her blog, "If you put a banana in a glass jar with a metal lid, it will stay fresh in the fridge." She used a wide-mouth pint jar and noted, "The best results are when you leave the peel on the banana and place the entire half of the banana in the jar."
Why the glass jar banana storage hack works
According to Amy, a sealed glass jar creates the ideal environment for maintaining banana freshness when the peel stays intact. Bananas contain enzymes that are triggered upon contact with oxygen, setting off the ripening process. While this is beneficial for firm or green bananas, cutting an already ripe banana causes these enzymes to hasten ripening beyond the soft stage, eventually turning the fruit mushy.
Sealing a sliced banana in a glass jar removes exposure to oxygen, halting this reaction entirely. This prevents the fruit from becoming excessively soft and developing brown spots. Keeping the peels on also limits how much of the banana flesh comes into contact with air. Additionally, storing the banana in halves rather than smaller pieces extends its shelf life, as cutting it into smaller chunks increases the surface area exposed to oxygen, which accelerates deterioration.
