For me the "easiest" are phalaenopsis. They barely had any root loss when transferred from bark to semi-hydro. Also consistent moisture benefits them enormously because phals don't have pseudobulbs for water storage. My phals used to add one new leaf per season, now they add two or three.
My 3 cattleyas, on the other hand, lost all the roots and all new growth turned black when I put them in semi-hydro so I freaked out and transferred them back to bark. Now they are recovering after being rootless for 4 months.
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Hoarding orchids since 2011
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