Hi Frank,
I usually put rocks -maybe golfball size --larger if the caudex is larger- around plants like that till they get some roots in.
Mike

Mike...
I savvy. So the caudex will be really just resting in a slightly depressed area of the growing medium and the rocks act to prop up the caudex until it is anchored by new roots. Interesting technique. I was thinking of making some kind of aluminum foil collar/doughnut to act as a prop, -which would be skewered into the medium to hold it in place- but the rocks would look more natural.

Thanks for the suggestion.

Frank