P.S. Some smart seed collectors noticed that they would occasionally catch an insect or insect egg with their seeds. It would eat seeds, and even burrow out of one pkt and into other pkts. I never saw it, but some have.
The answer is get the seeds really dry, and then put them in something airtight and FREEZE that pkt for a few days! For some reason that kills bugs and even eggs. So they say.
P.P.S.
Because I have a bad case of O. Seed D., with severe nerdiness as a complication, I like to keep desiccant with my seeds. Most people don't bother. But if you want to go overboard, keep the Ziplocs in something pretty airtight like a screw-lid jar, and keep a little desiccant in the jar.
I use silica gel from a craft store's flower-drying section. I put a tablespoon into a paper coin envelope and staple it. I used too use m ore silica gel, but my humidity-indicating cards said I was getting the relative humidity down below 10%, and that seems lower than is ideal. I think around 30% RH is better.
http://www.hillgardens.com/sto...
I said I was pretty nerdy. "Dry them and store them in paper envelopes" is enough, if you have a cool, dry spot.
P.P.P.S What kind of seeds? Some are naturally short-lived and lose some % viability no matter how you store them. One guy said that he had good viability from Lisianthus seeds their sec ond year.
http://www.hillgardens.com/see...
