I keep finding new ways to kill my orchids, and this one has been happening for a while. I have a phal and a Dendrobium that have a couple flowers each. I water them sparingly, but whenever I do water them, several flowers immediately droop and eventually fall off. This happens if I water with regular water or just mist the roots with distilled water. Both types of water are room temperature. But then I have two other phals that respond really well to this same treatment. What am I missing? I appreciate your help, as always.