Oncididium Splendidum with unusually tall but unblooming spike

[silken]

How much SuperThrive are you using? Too much of that can cause abnormal growth and I have read that you should stop using when plants are in spike. Also does your fertilizer have a high nitrogen content? This may be contributing to this spike wanting to grow so tall. Good thing you at least live in a warm part of the world!! Where I come from, I would have to tip it sideways!!