Lots of Japanese Maple q's huh? hehe Well anyways... check out my harvesting thread.
http://forum.bonsaitalk.com/showthr...ghlight=harvest I usually pick them late november early december. A good rule of thumb I go by is, -the seeds are ready when the seeds fly off (not fall off) when you shake the tree- or you can compare the color of your seeds with my seeds.
Kazuki