Thank you!
I made follow experience - older seeds (from a friend) germinate very rush - after about 36 houres. If covered with a soil, then takes 4-5 days.
I guess, my first seed (not from Tom) was too fresh.
I will plant out mid May also. But now, winter come back with a lot of snow. It's uncommon even for this area in Switzerland. For the moment it's hard, imagine spring
Akelei