Wait until after the blooms have fallen off. That should be another 4 to 6 weeks. Prepare a large pot, bucket or planter box with a good sandy loam. Water the soil well and use a pencil to punch holes in the damp soil. Then cut stems back about 8 inches at one of the nodes. Remove most of the leaves, except the top top 2 or 3. Cut the remaining leaves in half across the short sides. Dip the dry stems in a rooting powder. Put the stems down into the soild about 4-5 inches. Water well so the sand settles firmly around the stems. Now place the pot in light shade and water daily. You should see 80% of the cuttings survive.

THANK YOU TSmith !!!!!!!!!!!