With good storage conditions (at room temperature and dry) our seeds have no specific expiration date.
However, over time, the germination rate can decrease. You could still try growing the seeds later than the two or four years we recommend on the seed packets, depending on the variety. But please keep in mind, that it is just likely that fewer plants will sprout.
We only use seeds that are heirloom varieties, while other manufacturers often offer F1 hybrid varieties, which usually lose their germination capacity faster.
All our seeds are GMO-free and free from pesticides.