I have recently been over potting (in ten gallon containers) my caudiciform succulents to increase the caudex growth by simulating free root run and I was wonderinf if anyone on the list had tried this with pelargoniums to get a large caudex (swollen root/stem) in a shorter time. You would not believe (or maybe you would) the growth some of the succulents put on in a year from the overpotting.