David, I believe that these are mesic forest dwellers and even climb up onto the base of trees and can be seen in crevices...quasi epiphytic. Old orchid mix w/ compost and sand and/or coir or orchid mix even with potting soil should work. They do not like to be too dry, as I have found out killing a batch of seedlings 5 yrs ago in a drought. this same mix works well for my Worsleya, too. I thinlk that these are two amaryllids like very little disturbance once established. best, Kevin D. Preuss http://www.amaryllis-plus.com/