What medium really doesn't matter. Many people use corks, broken rock, lava rock, shells, marbles. The only thing is that it needs both airflow and slow loss of moisture. Some orchids need drying overnight, meaning faster drainage and faster drying. Crushed leaves, for instance, retain more moisture. The only problem is that they also will rot quickly (decompose) which will create too much nitrogen than is good for the plant and also acidify the root zone too much. Many orchids are mounted on pieces of wood. Coconut husk is a good go-to medium, the hairy part, or the hull if you can get it shredded. Some people use half a coconut husk as a "cup" just drill some holes in it for air-flow.
Moss really is not necessary unless it is what you can find that will work. Many people use live moss to decorate the pot, just make sure there is air-flow to the roots. Live moss is very dense.
Last edited by Optimist; 03-21-2018 at 07:07 PM..
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