I have had decent germination from some onion seed for up to three years. Bermuda was one that seemed to survive the longest and only kept in a drawer in the house not frozen. I love those Creole onions and they keep really good. Last year my red onions did pretty good and they seem to keep better than most but there are some others that keep well. It seems the best keepers are the ones with thin rings and are usually more pungent. I haven't ordered my onion seed for this next year yet. I usually start them in October in a pot of DE. I love growing them in the DE because if you let them dry out a bit before planting it is so easy to separate them. The DE just shakes right off.
I don't grow a lot of Vidalia types because they are poor keepers usually due to the amount of moisture in them I guess. My most consistent good producing onion and fairly reliable keeper over the past twenty years has been white Bermudas.
Bill
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