Hi Ken,
Where do you get the seeds for these?
Can they grow from cuttings?
I was told at one of the plant sales here that if you want to get really interesting caudex-forms,... periodically (I think like once or twice a year) you 'wiggle' the plant upward an inch or two, then push the potting medium downward to re-pack it, leaving some of the upper root parts and the lower part of the caudex exposed where it will 'harden' and start creating interesting forms. (Haven't tried it, but the grower who told me how to do it had a bunch with very unique looking caudex's.
