Well, I believe their flowering phase for Oncidiums are between September to November from what I've read somewhere. I recently got into Oncidiums myself so don't quote me on that. I'm waiting for winter and wishful thinking that it'll spike once the cold comes in. However to me, temperature drops depends on where you live that would trigger spikes earlier or later in winter maybe...? Some also say triggering spikes can be due with an abundance of light. So far no luck on that here. Heh.