In article , Phil L
writes
I guess some seeds are indestructable and some
are a bit flimsy!

Yes, exactly right. Poppy seeds, for example, live many years in the
soil, waiting to be flung to the surface where their germination is
triggered by light (a mechanism to give them a good chance of growing in
bare soil), beans and peas are viable for several years, some members of
the umbelliferae (eg parsley and parsnips) need to be sown fresh.
--
Kay
"Do not insult the crocodile until you have crossed the river"