In my experience, it doesn't matter. If there's anything that I'm proud of, it's my germ rates. I can usually get every single bean I soak and plant to pop and live. Maybe I'm taking a little bit too much credit for their vigor though.
like others have said, I have had them pop while on the surface as well, they never sank and germinated well.
some that sink will not pop open either though and some that float won´t open either...
the seeds open at different depths of submersion and can open at varying lengths of time. be good Mriko,
I got a huge batch of seeds that were 5-8 yrs old and almost all floated.Which to me meant that the seeds had dried out and were mostly full of air.Anyhow the only ones that popped were the sinkers and they didn't last as they were very weak