I have had success getting roots too grow by placing in one case the potted plant (small oncidium) inside a fish tank - layered the bottom of fish tank with moist peat moss and pebbles on top of that - covered the tank with top it came with allowing a small amount of air exhcnage. The peat moss on the bottom needs to remain moist so occassional water may be necessary. Tho I found that with the top on the tank it did not need to be watered more than once a month or so.
In another case this was not sufficient and I had read about live sphag seeming to be helpful so I obtained some live sphag and made a 'bed' of that on top of the peat/pebbles. wrapped a bit of the live sphag loosely around the rhizome and place it like that on top of the live sphag in tank - then covered top of tank allowing for some air exchange.
Both were placed in moderate light. I believe it is recommend that if/when you do get enough roots to pot your plant to slowly allow more air exhcange over course of a couple of weeks.
I have not tried sphag & bag myself.
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