Let me start by saying that I don't know anything about propagation.
In 2007 I planted 2 Calycanthus floridus ‘Michael Lindsey’ in my front yard and one in the back. Also, I planted a Calycanthus floridus ‘Athens' and Calycanthus 'Venus' in the back yard.
One of the Michael Lindsey in the front has had a baby. You can see it in the bottom right of this picture. I'm guessing that I should be able to cut it from the mommy this year. (if I'm wrong, please let me know).