This is a very good question to ask!!
With germination of seeds from a seed bank there are way too many variables present to give a definitive answer.
Some breeders are questionable...
How long have the seeds been sitting in storage.
Conditions when shipped, going from a hot country to a frozen country also has an impact on the germ rate.
So far i have been really lucky!
Nirvana seeds i got 4 out of 5 germ, the one did not even split after 2 weeks in paper towel.
Attitude i have 3 for 3.
Sannie's seeds i have germed all but one of the freebies that split and then did nothing else for a week.
RCMC i have a 6 for 6 germ rate! Excellent gear!!
Barneys Farm was 3 for 3.
All grew as expected with no stunting even from my self inflicted abuse!
Most have been super cropped and serious LST, except for the Auto's that i pretty much leave alone except for defoliation now and then.
For me the key is to add a few drops of H2O2 when wetting the paper towels, just to kill any germ or bacteria that could harm the seeds.
Oh and they also get placed on a roll of tape on top of a warm air duct in sealed containers.
A nice warm, humid environment is key!
When the tails are about 1cm in length they get transplanted into their first or final container, depending on type.
