Epiphytes versus terrestrials

[Ray]

My experience with paphs and cymbs in pots seemed to suggest that they like to drive their roots deep. With phals, I was shortening the reservoir-to-top of medium distance in order to reduce the moisture gradient in the medium. Since then, I also give phals very large diameter pots (relative to their size), as I find that they sink their aerial roots into the medium that way, better stabilizing the plant mechanically.