I haven't tried a Phal in S/H, some of my other plants seem to love it, others not so much. I have a problem with remembering to water them enough in S/H for one. My healthy Catt's thrive in it. My Phals have been thriving in their bark/moss mix so I don't see a reason to experiment with them. Maybe if I get some keikis with my keiki paste experiment, I'll have spares to experiment with! I haven't put the paste on yet, my Phals are in full bloom and not ready, or not in bloom at all.