Fogponics anyone? (ultrasonic aeroponics)

[Discus]

I imagine you can get your "fog-o-ponics" to work without any LECA etc. by suitably mounting the orchids with their roots free in the "mist chamber" (which is my understanding of how this normally works with normal plants). I'm somewhat surprised that the orchid root morphology was so different, but I guess it would be.

I'm not sure quite why you want the LECA there?

The major concern with long-lasting ornamentals (grow, repeat) vs crop plants (grow, harvest, sterilise, repeat) in any form of common nutrient solution is disease - water is an idea vector for disease transmission and those droplets *will* be big enough to cart fungal spores and bacteria and certainly viruses between *all* your orchids; even if you think the droplets won't be big enough, the roots will likely eventually grow to the base of the container where they will all share a nice thin film of water and any pathogens...

Also, 500ppm is WAY too high for most orchids, so I don't think you'll need to worry about this "limit" to the foggers.