I'm pretty sure this is one plant I have: Phal. Minho Princess x Lightning??? I got mine in bloom with some buds in March. It was packed a bit tight in moss when I got it from a greenhouse. I didn't water it for 3.5 weeks, but the blooms still opened and a smaller 2nd spike grew (only grew to produce two buds). At this point I noticed some springtails (harmless but often evidence of deteriorating medium) and then repotted in moss just not as tight. Let it soak then weakly fertilized. This plant takes a long time to dry up in this moss and i only water when it's totally dry, at which pt I soak it for 20 minutes and fertilize. It sits next to an east window. Its flowers have only just started withering in the last couple weeks but it still loses only one flower at a time, so it's taking its time. The small spike, one bud finally opened last week. However I'm not seeing root growth or any new leaves but it's holding on. Oh and it has been on and off warm and cool, often quite warm in my house.
So after all that, what was the condition of the buds/blooms when you got it? Were they small buds? I agree with some others that that pot might not be appropriate and you might be better off putting it in a pot with holes. What did the roots look like when you repotted? You said only the surface (assuming that's what you meant by superficial) roots are okay? How often do you water right now?
What brought me to OB some I don't know 6 months ago now is it...(?)...was an extremely wrinkled, limp-leafed Phal that hadn't spike in a while and a similar mini phal that hadn't bloomed in 5 years. I cut off all the rotted roots and repotted them in an orchid mix I added coconut coir and moss to. I then paid closer attention to just when the medium dries out, not completely but close, and watered them by soaking them for AT LEAST 20 minutes usually more (unintentionally). This has been a process for me, one of attentive observation and patience but my Orchids are now doing quite well in fact. I've learned that Orchid care is a matter of understanding what your plants "need" and how you can provide that. Maybe you don't water bark enough. Maybe you need to add a little bit of moss or something that retains moisture better. Jumping straight on the bark gravy train may not be the best thing for everyone. But then again, a lot of people on here seem to HATE moss. But how do YOU best provide the needed conditions?
Oh and before I end my rant, something else I think I've learned is that it's easier to come back from dehydration than waterlogging. Be patient, don't panic.
