When stored properly, cannabis seeds can germinate many years after they were harvested. They don’t come with a use-by date, but the longer they are stored, the lower the chances of successful germination. Seeds stored improperly may also take longer to germinate, up to a week in some cases.
Basically, the best thing to do is plan your grow around obtaining the seeds. The fresher the seed, the better your chances of a prosperous grow. We know this isn’t always possible, especially with the number of free or cheap weed seeds dished out by amazing seed banks like the Homegrown, so you need to know as much about storing marijuana seeds as possible.
For more details, please read the full article regarding storage here.