I had never tried rooting Heuchera leaves like this but it worked. Had tried stems in water but no luck. I pulled the stem off slowly getting the part where stem comes off root/mother plant. Stuck it down under mother plant and forgot about them. Repotting the mother NO ID and found these 2 rooted stems today. No rooting hormone used. Have potted the 2 stems in small pots to keep an eye on them.