Orchids for the crotches of my trees?

[Ordphien]

So here's the deal...
I want some orchids... for crotches of my trees.
Temps.. down to 30 in winter.. but specific microclimate prevents any damage to tropical plants.
Up to 95 (Fahrenheit) in summer.
Winter humidity hovers at around 40% and summer between 60% and 80%.
Wet rainy winter's. No frosts ever.
The crotches of the trees naturally hold decomposing leaf litter. One is a pine.
The other two are deciduous.

Another important thing is that it had to be able to handle my hard water.
I'm willing to flush it periodically with RODI water but daily watering will be handled by hose.


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