I use stem cuttings with a part of 1 leaf at the tip. apply 0.1%IBA (rooting hormone) stick in well drained soil & mist. takes 15-40 days to root. May also use leaf cuttings & or seed or division

Thank you George

You can root the leaves of rhizomatous begonias, including rexes. I usually break the leaves into pieces, like I would a lettuce leaf for a salad, and poke the pieces, with the side closest to the petiole down, in the soilless mix I use. One year my son helped me stick some leaf cuttings and stuck them upside down, lol. The tiny plants formed on the leaf margins anyway, up in the air. I couldn't believe it!

Hi,
I'm new to all of this too, but a friend gave me some cuttings from her Rex Begonias and I took stems, cut them into pieces and stuck them into the soil, I even did this with the larger leaves (cutting them into pieces) and covering them in the medium (which by the way wasn't anything more then reg. potting soil) All my cuttings took, I was very surprised at how easy they were to root. I even for fun took a leaf with a little stem left and put it into water, low and behold I have several little plants now just from a few cuttings. I think you could probably do anything with these and they'd root,HA!
Good luck,
~ Georgia

Thank you all . I am really excited to try these now.