Proper storage is vital for storing any seeds and basil is no exception. How long do they keep? Correctly stored, your basil seeds should germinate for as much as four to five years. Be sure to label your seeds with the variety name and the date of collection. Always use the oldest seeds first. Keep them completely dry and in a dark location for best results.
The best way to store any kind of seeds is in a glass jar with a solid lid. Freeze the jar containing the seeds for a few days to ensure that any insects, larvae or eggs will be killed off to protect your seed. Once you remove the jar from the freezer, store it in a dark and cool location.