I have never seen any successful bonsai from sugar maple. Don't waste your
time. If you would like to try a collected native maple, use red maple, Acer
rubrum, but it will take ten years to look like anything.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)