depends .
coco chips, moss, some perlite, some hydroton.
I like net pots. really cheap at one store. You can see whats going on and you can use them with hydroton for S/H just by putting them on a tray or water or on top of a glass/ cup that fits snugly.
in traditional culture you can also put them inside a clay pot so it helps keep humidity around the roots but still get good areation.
I have a clay glazed pot and everything I put in it dies, for some strange coincidence. Not orchids tho
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