Many of us may return home from the store and promptly wash a bag of grapes before storing them in an airtight container, but this isn’t the best method for keeping them fresh.

Without proper airflow, the fruit can build up condensation and spoil sooner. Grapes do need some humidity, but there should never be so much moisture that it’s visible.

Instead, keep grapes in the crisper drawer of your fridge to control the humidity level. Store them in the bag they came in, or some other kind of ventilated container for airflow.

If kept dry, cool, and ventilated, grapes can last up to three weeks in the fridge. The sole exception to the airtight-container rule is cut grapes, which last up to 48 hours.

You should only wash grapes right before you eat them to prevent premature spoilage. If you have to wash them before storage, dry them well to limit excess moisture.