I use medium/large grade bark and it works just fine.
You can essentially use LECA, but I don't have too much experience with it, so I have a difficult time advising about this potting media.
I've never tried growing them with lava rock either, but hypothetically speaking, it should also work.
CHC should work too.
With a clear plastic pot and medium/large grade bark alone, I don't have to water everyday if I'm not able to.
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Philip
Last edited by King_of_orchid_growing:); 04-18-2013 at 07:47 PM..
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