What triggers blooming in Oncidiums?

[rbarata]

My Oncidium has been blooming around this time of the year but this year it didn't bloomed from the older pbulb.
In the meanwhile it had a new growth still going on.
When it bloomed in previous years it was outside, with hot days and more or less cool nights (around 18ºC/64F) with bright indirect light.

This year it stayed inside with a constant warm temp and light reduced by 50%.
As soon as I noticed it was not blooming I've put it outside and now has a spike growing from this years growth. I'm not sure what triggered blooming as both conditions (light and cool nights) were changed.

What do you think?

[Roberta]

Yes. (could have been both, or either) Or just timing... correlation does not necessarily equal causation. My guess... and it is only a guess, is that a change in conditions woke it up. (When a plant encounters a bit of a shock, it decides that it needs to reproduce... hence flowers)

[rbarata]

Thank you, Roberta.