Seed Saving Viability Chart
How long do seeds last? As a rule of thumb, germination rates of seeds decrease every year. But some seeds are known to live far longer, especially if they are stored in a cool dry place. Here is a table of average seed viability taken from a UF publication.
UPDATE: This year-2020- as we are in the midst of the COVID19 pandemic; many of us have been under stay-at-home orders. With that backdrop, I pulled out an old shoebox full of seed packets. Most of my seeds were date stamped 2010 or 2011. I planted them anyway and with the exception of the pepper and onion seeds, they all germinated. So, give those old seeds a chance!
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