Posted: 05/08/2014 at 14:00
Not ever tried myself, but might have a go this year.
Don't know if you subscribe to GW mag but on page 71 tells you how. You take a non flowering stem, remove a lot of the leaves, so there's just a shoot. Insert the cuttings into the compost, next to the sides of the pot. Water and keep cuttings in humid conditions eg inside a plastic bag.
Not sure if you could try rooting powder on them.