Oncidium Green Valley Sweet

[fotofashion]

When I bought this plant last month it had 4 tall spikes blooming. (This is a large plant). Two of the spikes appear to be finished but I have observed something interesting on an older, trimmed down spike. It is starting to form buds somewhat like a Phal. will do. My question is: When I trim the no-longer-blooming spikes, just how far down should I trim them in order for them to put out more buds. BTW, this is a relative of Sharry Baby and is fragrant in the AM.
Beverly A.

[RosieC]

Interesting, I'm new to flowering this sort so can't really comment. Would be interesting if they can flower again on trimmed spikes.