I've had some success with seeds tthat were as old as 8 yrs. I soaked them overnight in tea before planting them in potting mix. Probably as much as 75% germination on 2 different occasions. Both were old heirloom varieties - but not a clue which since I got them at the Doon Heritage Crossroads Museums' Mennonite Farmhouse Garden, back in the mid 90's. One of them seems to be a perennial, rather than a biannual.
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