I have a couple of Cercis started as Bonsai, this one being about 15 years old. Thought I'd share...
BTW.. I've never had flowers on mine while potted in a Bonsai pot. The leaves do reduce nicely and will be very small heart-shaped, dollar-coin sized. I don't have a pic of it in smaller leaves, but since they're temporary each year (dropping in the fall), I don't worry too much about them.
Joey
Austin, Tx