Asafoetida should be stored alone in an airtight container, away from other spices and ingredients, to prevent its strong odor from contaminating them.
Asafoetida, also known as hing, has a very pungent and powerful aroma. If stored with rice or other ingredients, its odor and flavor can easily transfer, altering the taste and smell of the other items. To maintain the integrity of your other spices and ingredients, and to preserve the distinct flavor of asafoetida for when you specifically need it, it's best to store it separately. An airtight container is crucial to contain its strong smell. Glass or stainless steel containers are preferable as they are less likely to absorb the odor compared to plastic. Ensure the container is properly sealed after each use.
If you're using powdered asafoetida, consider storing it in the refrigerator, especially in warmer climates. This helps to prolong its shelf life and further minimize the risk of its aroma permeating other foods in your pantry.