I finally received the seeds from the Maple Society. I want to thank all those who collected, sorted them, put them in paper bags and posted them : thank you very much for the time and efforts spent. Now it's up to me to find the best way to make the best of this seeds galore ;-) PS: I had put some of my own seeds from A. palmatum palmatum directly in a ziplock bag that I put in the fridge on Dec. 5th after having soaked them overnight in water, and two days ago, some of them were already sprouting. Bad photo, but you can see some of the 10 or so that showed a white root. I planted them in individual pots and I keep them in the coolest room I have that gets some light.