I have had this problem with a Phal equestris var alba I donated to my mom to look after while it was in flower My mom said a leaf had yellowed and died and I thought nothing of it, just assumed it was an old leaf, When I went down the other day I saw it had another yellow leaf and only one green one on one portion ( basal keiki and mother plant in one pot) We inspected the plant and there is no sign of crown rot or rotting of the roots and then we noticed it was throwing up a third flower spike the plant has been in flower for months and just keeps on going and now is at it again with this 3rd spike, then it hit me! I havent taken any feed down to my mom so the plant has not been fed in all the time she has had it so I am assuming the plant is very hungry and draining itself through putting out so many flower spikes, we fed it when we were there so I am gonna wait and see how it does, anyway enough rambling my point is, how often have you fed this orchid and what with? Is there a chance the plant is underfed and putting all its energy into the flowering spike to the detriment of the plant?
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