I have some old tomato seeds that I did not store carefully- they've moved with me several times- and have lived in basements, and on shelves in closets. I have recently test germinated 3 packets and got 90% germination in less than 1 week using the paper towel method, here are the varieties, sources and age:
Reif Red Heart 1997 Johnny's
Kotlas 1997 Johnny's
Grandma Mary's Paste 1997 Fedco (still one seed in the paper towel- not giving up yet since 3 germinated this morning)
Tomato seeds seem to be pretty hardy! This has not been the case for other types of veggies. I had 0% germination on broccoli, lettuce, cucumbers and winter squash from the same sources and ages. Other veggies which have germinated well are peas (100%), beans (90%), radish (90%). It's been an interesting experiment so far!
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