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You should also check to make sure that there are no bugs on the plant - either brown spots(scale), or white(mealy bugs), or aphids. As bugs will...
Ctna stands for Cattleytonia so the plant was crossed with Cattleytonia Why Not `Roundabout`.
Mine seems to flower once a year in February - at least it has for the last two years.
I cut mine back to the pseudobulb - but I am not an expert.
I grow orchids under 4' T5 lights....all sorts of different kinds and they seem to do very well.
Try the http://forum.theorchidsource.com/cgi-bin/ultimatebb.cgi - the people there are very helpful and should be able to help you.
There is no contact information...so no way of emailing you. I can not pick up but if you would be willing to mail to Pender I would be willing...
I would love one if you still have some left. P;ease email me.