I have several Phalaenopsis all sitting on a table facing a floor to ceiling window with curtained light. Several weeks ago, four of them grew spikes which matured with multiple buds on them. On one plant two buds have opened, BUT on each some of the mature buds have turned yellow and will soon drop. I have not done anything new, mist daily (only water they get) with filtered water. The day-night temperature is the same (? 70 F). Can anyone offer ideas as to why this is happening? Thanks
