My Sharry Baby usually blooms in Spring, but last year it did it twice Spring and in winter, right on Christmas eve.
What I noticed is, it loves lots of water, lots of warmth and bright light. I can leave it in my growcamp outdoors during winter, but last winter, I decided to pull it in and bring it near our south facing window. Interestingly it sent out a bloom spike. So it seems come winter time, I should do that. Same happened to my other Oncidium orchids which I also brought indoors, some were in bloom as well late Fall to early winter, where in other years, they can only manage to bloom in mid Spring.
Currently all the Oncidiums that I have are back in my growcamp outdoors, getting all the bright light they can have, lots of cross breeze, and frequent watering, since they are almost always very thirsty.
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