Aerial roots are an issue with potted plants only.
In nature the Phalaenopsis live attached to tree branches. The plant grows out and down. The roots are genetically inclined to grow up, that is where the branch is supposed to be.
When you mount a Phal naturally hanging down the roots will all grow up and attach to the mount. there will not be any aerial roots.
There is never the problem of crown rot since there is no crown to hold water when it points down.
Most surprising is that hanging down the Phals can take very high light levels.
Light is never a problem with orchids, they like all you can give them. The problem is the heat that comes with the sun. As the heat builds up it kills the chlorophyll in the leaf, we call it burn.
Well the side of the leaf that faces the sun naturally has no chlorophyll. I grow mine with my Vanda and Cattleya.
It is only when we put them unnaturally in a pot upside down, that heat buildup becomes a problem. For a million years these orchids have had to survive with only light levels bouncing from the forest floor. As a result the bottom (top in a pot) has evolved to become super sensitive. Upside down in a pot they need very low light.
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