I agree with most of what Roberta said however...
Quote:
Originally Posted by Roberta
Best time for repotting is when new growth is starting...
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I only have one mtdm. not the same as yours. With the one I have, the new roots didn't start to grow until the new growth was significant size, much larger than most of my other oncidium orchids. Because I repotted when the new growths were small, and disturbed the root system before it was ready to grow new ones, I set it back and the two growths that were forming were very stunted. The plant did recover from that incident, but took another set of growths before I saw flowers again.
The best time for repotting is when the new growth is beginning to make roots. Too early and you risk setting it back. Too late and you risk damaging the new root tips.
Another thing you might try...
It has been my experience that most of my oncidium orchids will not start a new growth while it is also supporting a flower spike. You may want to cut the flowers now to encourage a new eye to begin swelling sooner rather than later.