Question
I purchased a gorgeous oncidium (dancing lady orchid) last February totally in bloom.  After the blooms were spent, I cut off the stems and it continues to grow but almost a year and a half later, no sign of bloom.  Should I repot it and if so, what type of potting medium should I use?  Presently it is potted in some sort of a tight straw looking medium that I have never seen before.  I have pretty good luck with the rest of my orchid plants (all Phalanopsis)  thanks in great part to your past help, but I am really stumped by this one.  Would love to have it rebloom for me.

Answer
Catherine, it appears that your plant is potted in a tree fern orchid potting mix.  In my experience, that is best for oncidiums. Since the plant is doing well, I would not repot it at this time.  Oncidiums like it warm and bright to flower so try to increae the light level. If you have a place where you can grow it outdoors, find a nice sunny location when daytime temperatures are 70 degrees or higher.  Initially, you can place it in a semishaded location and, then, gradually expose it to more sun. I have been able to grow oncidiums in full sun but I check on them to be sure that they are not getting leaf burn.  Same for indoor growing during cold weather.  Put it in the sunniest location. The leaves should be a light yellow-green if it is getting enough sun to flower. If there is a name tag in the pot, that might give a hint as how to best grow the plant. Let me know the name if it is available.  While most oncidiums prefer the conditions I suggested, there are some exceptions. Once you achieve the best conditions, don't expect the plant to bloom right away.  Most orchids have a blooming season and the favorable temperatures are needed to set the buds for its next bloom season.