Paul, there are no hard and fast rules for production. I have several trees that are much older by 15 years than your Red Pygmy. They have never produced seeds.

I would like to see a crop of seedlings from Red Pygmy, I enjoy growing from seed. Its the surprise of the unusual seedlings that show up in a flat.

Ron

Is it possible Red Pygmy doesn't seed or can only be fertilized by another red pygmy.

Is it a male tree? I have watched an acer griseum for 20 yrs. an never a seed. its 12-13" trunk. That's one tree you want seeds from!

I suppose its possible that a tree may never set seeds, or should I say viable seeds. Then you have to have flowers first.

Ron

I din't know there were male and female trees in JN maples family.
Fruiting trees, yes, Ginco baloba, yes but not maples. That is until I thought about it. Seeds are part of fruit; and I have heard that Griseum's are notorious for not setting viable seeds. Is there any way to find out if it is a male or female?
Paul

I have seen seeds on red pygmy jm at our local botanical garden so it is not a sterile variety. I would just give it more time to mature. I have never heard of male and female maples. I don't think maples need to cross polinate in order to produce seeds.

JM can undergo asexual or sexual reproduction, but there are no male and female trees per se. Red Pygmy will set seeds it depends on the age of the tree, cultural conditions and the age of the scion wood used to propagate the tree.
MJH