I am moving more and more towards a system where I only keep one jar of seed for each variety/species (at least on varieties that maintain their viability for years). So for example with dry bush beans, I'll decide how much bean seed I want to save for planting, and for an archive, and for sharing, and I'll save that much seed. With beans, it might be a two quart jar. Then each year, after harvest, I'll dump out all but 1/3 of the seed in the jar, and refill with fresh seed. So that keeps seed around from previous years, but I don't have to keep track of it separately. Then I eat the excess seed, or feed it to animals, or donate it, or whatever. I'm cautious to do germination testing before adding seed willy-nilly to the common seed lot.
For the sake of full disclosure, I have all kinds of seeds laying around from before I adopted this strategy. They do not bring me joy. Therefore, as I sort through them, I am feeding them to the chickens, or tossing them into the wildlands so that they can attempt to grow.
For 20 year storage it can be dried down and frozen. Dry it further, then freeze in a tightly sealed container. Bring to room temp before opening.
Once you start saving seed you end up with much more seed than you need. One way to keep your genetic diversity up is to collect less seed but do it from more plants/fruits. Then mix multiple years seed together when you plant. That way fewer of the seeds will be "related" and you'll have more diversity.
One advantage to storing seed over multiple years is that you can maintain varieties that cross-pollinate, like corn or squash, by simply growing one variety one year and another the next, and alternating thus indefinitely, keeping both varieties pure. Since these seeds easily store for several years, you could keep three or four varieties indefinitely, and also reserve a season to plant two and experiment with letting the cross, etc.
I'll be attending this seed swap. I am especially looking for collaborators in areas where blights vigorously attack tomatoes.
My friend works with horses, I may be able to get some but then yes I’m not sure if I’ll be able to break it down... Is poultry much preferable? From what I read P seems to be higher (our P is pretty low).