Start by cutting tips, leaving at least 15 - 20 centimetres of stem.
Put cuttings to the side then remove the main plant. These plants are fairly shallow-rooted so they are easy to get out of the ground.
Dig a trench for the cuttings - about 20cm deep, place cuttings and backfill to hold them up. The cuttings can be planted directly in the ground in summer.
Don't water the cuttings for a week or so to allow the base to dry off. In cooler months, leave them out of the ground for a week before planting.
In around a month the cuttings will take root and the top of the cuttings will grow soon after.