Hi Lenny,
It looks like a Sango Kako (spelling??) by the bark? I think they look fantastic!!
My suggestion would be to cut it off at the first branch and use that as the new leader. That way you are getting some taper and also a bit more movement.
Wire some movement into the new leader and let it go nuts for a while!
NathanM
I agree with Nathan that it is probably a Sango Kaku (or Senkaku). You can cut it back as he suggests and even leave the wire on the first branch, using it to give some movement to the new leader. Re-anchor the wire, though. Seal the cut straight away. Yes, young trees (and this one is
very young!) grow better in a pot where their roots have plenty of room, but in this case the pot is already so outsize that there is no need to transplant it now. For general growth instructions, you can't do better than the ones given by shibui on Jan.17 under this thread.
viewtopic.php?f=129&t=7379 Note that he does not mention defoliating! Young trees, or trees that have strong growing to do, are generally not defoliated. Reading about bonsai is a good thing, but just picking out unrelated or incomplete chapters here and there can cause trouble.
Finally, some people expressed the opinion a bit earlier in the season that Acer palm. Senkaku is not suitable for bonsai, because the leaves don't reduce. That's incorrect. I've got two big bonsai ones and they
are as good or better than the average Japanese maple. Give your tree 8 - 10 years and if you treated it right, it should be a beauty by then.
Lisa
Lisa