Most seeds store best if kept dry and cold. An airtight container in the freezer works well. For sprouting, I’d suggest first dividing them into whatever proportions you plan to use them in.
Some species last longer in storage than others. I think onions are the ones with the shortest storage life, but I’m going by memory here. Beans can last for ages as long as they’re kept dry. There have been bean seeds found in archeological digs and in the ruins of old villages, that were carbon-dated at over a thousand years old, and they still sprouted!
When I took a tour of the Baker Creek seed bank, the manager said that the storage life of a seed is best if the percent humidity and the temperature in Fahrenheit added together total less than 100.
Thanks!
We should all invest in Coconuts if we want long-lasting ‘seeds.’ ;)
How to grow a Coconut Palm in Florida:
https://www.thesurvivalgardener.com/planting-a-coconut/