Humidity??
Last year after the orchids went outside, I had to wash mold off walls and dehumidify for a week! Big windows are covered with dew each morning! This year, I have been emptying out the movable trays (the ones without shelf legs in them) daily and trying to spray less. But the more I mount the more I need to spray those roots. But it's much more in control this year! Ursula has the whole ceiling of glass to dry her plants. My set up is much trickier!! And then there are those endless days without sun!! I have to turn the heat up a few degrees. This is why I feel like each flower is a miracle! Life is such a balancing act chez moi.