I took (stole) two cuttings off this plant from where I work (non flowering tips). I've had them in water now for about 4 weeks. There's no sign of any roots but there are new leaves around the tips (they're all green instead of burgundy!). If it ever stops raining, I'm going to pop them into a pot of compost to see what happens. Maybe they'll grow, maybe they won't!

Semi ripe cuttings in late spring, early summer (bit late now) or layer the lower branches if possible.