| Like you said in the mini phal thread, it's just a matter of extrapolation of what a plant needs. THey're epiphyted in nature, much of the time, and even when they are terrestrials, they grow in very shallow leaf-little type substrates, rather than actual soil or anything like that. I imagine they are simply opportunistic and will grow on any substrate that is appropriate. After all, a happy masdevallia is an absolute weed. I actually started mounting them because many of the species with pendant or lateral inflorescences are so much more attractive, that way. I'm a big believer in letting the plant tell me how it will best display itself.
All other things being the same, the biggest thing about growing pleuros mounted is to keep the humidity up. They lack pseudobulbs and they have very fine roots, so drying out is the kiss of death. As long as the humidity is high enough to keep them from dessicating, they do very well, this way.
-Cj |