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Seed Storage again

Thanks for all the great seed storage tips! Now I am wondering about the
seeds of annual flowers like coleus, cleome, nicotiana, etc. Are these
considered tropical? I have found that asclepias tuberosa, which normally
needs a cold period, will start just fine indoors with seeds plucked from
the pod in February. So would freezing seeds affect the germination
inhibitors? Or wouldn't this apply to most annuals?

Carol
zone 3, MN
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