Very good thread about hangianum culture...I would love to hear the progress of your hangianum seedlings from all of you posted here.
Just a few years ago, I got a tiny seedling from a fun-raising event here, probably only 2" LS when I got it..... now the LS is about 5". For sure it is the slowest growing Paph. seedlings I have ever grown.
I let it grow in the straight seedling bark mix that came with for about a year and a half and it practically did nothing. then I changed the potting mix(seedling barks, sponge rocks, charcoal, and some chopped moss) and it grew better in that new mix. The leaves got greener and shiny, and the root system got better too, but still growing very slowly... Today, I repotted it in the same mix except I used small-sized CHC in the mix instead of chopped moss this time.
It took me over 10 years to bloom my sanderianum from a tinny seedling...I hope the hangianum won't take that long.
Again, love to hear from you all.