Here is the only oncidium that survived my move from Atlanta to San Diego. I suspect the others preferred the cool, AC-controlled Hotlanta homes over the non-AC homes / outdoors of San Diego...
This Onc. sphacelatum grows like a weed outdoors here, full sun (ish). It's outgrowing a 12 in bulb pan... not sure what to do any more. I'm tired of dividing it haha...