I put this in the ground last year to err thicken the stem up, and the central leader has taken off and is really thick, maybe too thick for a broom style now.
Its a silver birch that i acquired a couole years ago as a tiny sapling.
This is it now:
http://img.photobucket.com/albums/v1...er/SBB007a.jpg

and this is how it looked last year before I got to plant it out:
http://img.photobucket.com/albums/v1...der/SBB005.jpg