Hi Kathy I have never tried one, but they should do well. They are a member of the hornbeem family I belive, and that exfoliating bark is way kool! If your going to do one, now is the time to do a heavy chop on one. Try to find one with a good base and surface roots!
Thanks Mitch If I find a nice one, I think I'm going to try it. The only thing I could find bad about them is that their life span isn't as long as some others - but as long as I don't kill it, it will probably outlive me. They also seem to like being wet like cypress. I'm thinking probably a mix of bonsai soil and miracle grow potting mix.
River birch is not a desirable species for bonsai, as it tends to drop entire branches and even trunks (for multi-trunk specimens). They were a landscape fad in the 80s until folks figured out the propensity to die back. Then that business pretty much dried up.
Another GNOBS member told me the same thing. Also, there are some planted around my workplace and I've since noticed how often they break even in just a regular thunderstorm.