You should store seeds in conditions that are cool, dark, and dry. Temperature fluctuations, especially heat, and humidity are seeds’ worst enemies. Seeds do best at a moisture content of about 8 percent.

One way for you to ensure moisture content is to use a desiccant (a product used to remove excessive humidity) .ith your seed packets and seal them together in an airtight jar. A standard canning jar and lid, along with some silica gel, will do the trick. Add the silica gel to the jar; add the seeds, still in their packets, to the jars, and seal. Small seeds will dry down to 8–10 percent moisture overnight, while large seeds may take several days. Seal the dried seeds in a new, dry jar and label it clearly. Then place it in a dark, cool place. You can even store seeds in your refrigerator or freezer.