sceletium tortuosum (Kanna)

Is their anyone out there that has one of these plants as a housplant? If so could you give me some tips on the best ways to grow this plant. I have one and although it isn't quite a year old yet it is quite small and doesn't seem to be doing very well. I would also be interested in any tips on how to take and grow cutting from this plant. If anybody can help me with this it would be greatly appreciated. I love this plant and want it to grow big and healthy.