I have done well growing P. laueana but can not get it to bloom. The plants appear very healthy, and I've gotten several new plants from leaf pullings I've taken over the last year, but never, ever a bloom.
I grow it in a wardian case at about 60% humidity, although I just sealed it a bit the other day so humidity is up to about 70% now. I have a florescent light on about 15-16 hours a day. It's one of the Lights of America spotlights and is about a foot above the plants. I have reduced the light a couple of hours in the winter, and increased it again in the summer to give it some seasons.
Any suggestions? I've been told it flowers very freely and doesn't need to go dormant, although mine did the first couple of years I had it.