I find that I have to treat my Phals like succulents grown in a cooler condition. Deep water at least once a week at the root zone only, and let dry for several days, but really lots of air around. I guess it helps simulate a nice cool down.I think the leaves hate our hard water, but roots don't mind as long as they dry out fast. I only dare to have the leaves wet, when it will be rain on the leaves when temps are warm. I always find them to prefer to have a cool summer feeling.
Thinking about it, in their natural environment, I think they get lots of rain on very warm days, cooling them down. And typically, during cold season in the tropics, there is no rain, just cool air around, or gentle cool mist.
