A seed is a living thing, and when you put it into a cold environment, the life cycle of the seed slows down. This also means that the degradation slows which in turn means that your seed will last longer than it normally would in an environment where the life cycle of the seed continues at it's normal pace....it's why we put fruit and veg and herbs in the fridge...it slows down the life cycle and the decay, it's the same principle for your seeds
