When I have left over vegetable seeds I place them, in their original package or ziplock bag, in a plastic bowl with a lid. I add rice to the bowl, not getting it mixed in the seeds, and put it in the refrigerator. The rice soaks up any moisture that may make it in the bowl. I just planted the last of my pink eyed purple hulled pea seeds that I bought 4 years ago and they grew just fine. I put the rest of my leftover seeds from carolina supply in there and I am hoping it works with them too.