anything between 0 and 70% is realistic. I did a little germination test this year with some 10+ years old bag seeds I found at the bottom of a drawer, 8/10. It’s just surprising, almost like seeds are made to preserve the life in them for a long time 😉
Another thought: you could sand them. after decades in dry heat I’d expect the shells to be very desiccated and hardened. BUT I’ve never done this myself so who knows?
this excellent guy shows it in under a minute, I’ve put a time stamp in:
if you have plenty of seeds I’d do something like this: some just in water, some in water with H2O2, some sanded in water, some sanded in water with H2O2
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