Hi Wentworth,
I have a Sunipia bicolor (which used to be called a Bulbophyllum). Anyways, it pretty much rambles all over this square plastic pot that I have and I like things neat and tidy so I always train the p/b back into the pot... anyways, just noticed this week that it is sending out an inflorescence and it is on a p/b that is on the edge of the pot.. but all it's roots are still in the sphagnum moss. So I guess it must be a maturity thing and a bit of a condition thing... the edge of the pot would dry out much faster than the middle as there are holes on the side of the pot.
good luck with the bulbos, I am getting into them lately and want more and more and more....
cheers
tim