Glass jars, like mason jars, are ideal for storing seeds. Their one drawback is that most are not opaque, so you’ll have to keep them in a dark location or cover them with something, so that the seeds remain in the dark.
If you ordered your seeds from a top online seed bank, they probably arrived in sealed packaging. If you haven’t opened it yet, it is best to just leave them sealed in that package.
Plastic Container (Like A Film Canister)
Just make sure to protect them from temperature fluctuations. Even if temps are warmer than is ideal, they will be ok, as long as the temperature remains constant.
Plastic bags can work in a pinch, but they are far from ideal. Most are not airtight, which means they can not prevent fluctuations in light, temperature and humidity.
Seeds are best stored in a cool, dry, dark location. That basically describes a fridge. With one caveat. You can’t open the door all the time.
Since desiccation-tolerant seeds stop almost all metabolic activity as they mature and dry, they can be stored for months or even years with only minor loss of viability and vigor. Desiccation-tolerant seeds which show high germination percentages when fresh—if properly dried and stored in a freezer—can typically retain their viability for years.
To use silica gels for drying seeds, place equal weights of dry silica gel and seeds to be dried in a well-sealed jar for 7 to 8 days. Then transfer the dried seeds quickly into airtight storage jars and place in a freezer, refrigerator or other cool, dark place.
Avoiding Problems With Stored Seeds
Mold and Mildew: A common problem with stored seeds is mold or mildew resulting from incomplete drying before storage. Dry your seeds thoroughly before storing them (though drying them to 0% moisture will of course cause their death). If seeds sweat on insides of jars during storage, they are too wet and must be dried further in order to store successfully. At this point the use of a desiccant is a good idea. Don’t tarry, because damp seeds will mildew quickly.
Seeds with low initial germination rates will begin to lose viability fairly quickly, however, even under ideal storage conditions. Seed lots with a low initial germination rate should be regrown as soon as possible. If a batch of seeds with poor germination is grown out and a healthy batch with good germination produced from them, the healthy batch can then be dried, frozen and stored for long periods successfully.
Seeds air-dried during humid weather require additional drying with desiccants such as silica gel before final storage (but don’t use heat!). Most seeds benefit from drying with silica gel if they are to be stored for very long. The longest storage life for desiccation-tolerant seeds is achieved by drying them to between 5% and 7% moisture content (by weight) and then storing them at several degrees below freezing. As storage temperature rises above freezing or moisture content rises above 5 to 7%, longevity in storage goes down and the incidence of mutation rises. Seeds dried to a low moisture content with silica gel and then stored in a freezer can usually retain viability for many years.