Claims that a method will keep bananas from turning black or rotting for 2 years are not realistic for fresh bananas. Fresh bananas naturally ripen and eventually spoil because of enzymes and the production of ethylene gas.
Here are evidence-based ways to make bananas last longer:
- Keep them at room temperature until they reach your preferred ripeness.
- Separate bananas from the bunch or keep them away from other ripening fruits to slow ripening slightly.
- Wrap the stems with plastic wrap or foil to reduce the release of ethylene gas from the stem area. This may modestly slow ripening.
- Refrigerate ripe bananas. The peel will usually turn brown or black, but the fruit inside often stays fresh for several more days.
- Freeze peeled bananas if you won’t use them soon. Frozen bananas can last 2–6 months (or longer with some loss of quality) and are great for smoothies or baking.
If you need bananas to last for a very long time, they must be preserved (such as by drying, freeze-drying, or canning in appropriate recipes). No simple household trick will keep fresh bananas in good condition for 2 years.
