First off, it is very common that upon repotting a plant into a very different medium, the plant will be set back a little. This is because roots adapt to the culture they grow in - when they are older, that adaptability is limited. So when you switch you medium, the environment of the roots changes which often causes older, established roots to die as lots of new roots start growing that adapt to the new environment. This costs your plant a lot of energy and sometimes setback can happen when something goes wrong in the old-roots-disappear-new-roots-start-growing cycle (like your old roots were not in great condition, or nutrient deficiency causes new roots to not grow rapidly enough, etc.).
You are going from a very moist medium to one that is relatively dry. If you did not pre-soak the medium, it might be even dryer in the beginning because the bark does not absorb the water well.
This may be what you are experiencing. The temperature should help with watering needs, though I fully expect you need to water more in these conditions than when the orchid was in moss. Maybe even mist the surface of the bark in between waterings in the first few weeks to prevent the top from drying out excessively.
Essentially, a little setback is nothing to worry about, but you certainly need to water an orchid in bark/rock more than moss. Additionally, Miltionopsis likes to stay quite moist, more so than other orchids in my experience, so keep an eye on that medium.
Last edited by Puja; 11-16-2018 at 10:14 AM..
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Repotting Miltoniopsis from sphagnum moss to orchiata bark-- watering needs?
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