I apply 0.1& IBA (Rooting hormone) to the cuttings & mist 2-4 weeks is usually more than enough time to root. They do root easly where ever the stem touches the ground. so this may also be used to propagate the plant.

Also, if you look carefully along the stems you may (should) find roots already growing on some of them. This is common on mature plantings. When you do, clip off the stem below the roots and pot, set in medium shade for a few weeks.