Store seeds in an airtight container in a cool, dark place, such as a pantry or refrigerator, to keep them fresh.  Some seeds contain healthy fats that can become rancid when exposed to light, heat, and air. Hence, seeds should be stored in an airtight container in a cool, dark place, such as a pantry or refrigerator, to keep them fresh and prevent rancidity as well. This helps prevent rancidity and preserves their nutritional value.