First I don't have any seed for you sorry my tree is not big enough.
Second there are 3 different populations (in Texas) of Acer grandidentatum one is in Ft.hood another in the Hill Country around Bandera (Lost maples area) these two share
similar genetics to a Chalk Maple Acer saccharum var. leucoderme). (Acer saccharum var.grandidentatum) which is what most people have in central Texas. (Acer grandidentatum var grandidentatum) is
in the Guadulaupe mountains and reaching as far north as Utah and as far south as Northern Mexico.I have a Acer saccharum var. leucoderme which was collected in east Texas and has performed well in my Alkaline clay of Austin.My point being you may be able
to find the Chalk maple seed easier. The seed also needs cold to germinate typically moist stratification for 90- 120 days @ a temperature of 33-39 degrees.Many of these seed will not have a viable embryo. Put the seed in water if they drop to the bottom that is what will germinate @95%. Discard the floaters.
Art

I bought mine at a place called Natives of Texas near Kerrville years ago. Mine is tall now and while I know it bloomed at the top of the tree last spring, I haven't seen any seeds. BTW, I love my Bigtooth Maple!

Art,
This is the first I have heard about there being any major genetic differentiation between the Texas Bigtooth populations, or about populations being more closely related to Chalk Maple. I was under the impression that the name differences were primarily taxonomic overlap. Do you have any references you could point men to on this>

Travis

I have heard that they differ, but I am not very versed to how. I was told to m,ake sure that I got the ones from Lost Maples.