I have been trying out different mediums too :-) sort of. If I am repotting out of old sphagnum with damaged or rotting roots (which is the case with department store phals), I put them in 50/50 bark and sphagnum so they can dry out more. I also have some that I repotted into just bark and I am getting the hang of it now.
The one that is growing best, though, is in just sphagnum. Wow it is growing like a weed! But the roots are very healthy and have been since I got it so I didnt worry about the extra moisture that the sphagnum holds.
So for me they grow best in sphagnum, but I cant use it if I have to undo damage that the store has done.
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