We’ve all been there—buying a bunch of bananas only to watch them turn brown in just a few days. But here’s a simple trick that can keep them fresh much longer: wrap the stems in plastic wrap or foil.

It may sound too easy to be true, but science explains it. Bananas release ethylene gas, which speeds up ripening. By sealing the stems, you slow the release, giving your bananas extra days before they spot and soften.

Some people even go further, separating the bananas and wrapping each stem individually. Others pair this trick with storing them away from apples, which also release ethylene.

It’s a small kitchen hack, but it saves money and reduces waste. Next time you bring home a bunch of bananas, try it—you’ll be surprised how much longer they last.