Oncidiums are really tough and do recover. When an orchid is rootless, I like to fill the pot nearly to the top with medium, then stake the orchid on top Of the medium (chopsticks/pencils & twist ties work well) until roots are about an inch long before covering the roots. The orchid cannot absorb water without roots and yet it needs humidity (a clear bag placed over the pot can help retain humidity). Repotting after roots have grown can damage the roots. I have used this method with many oncidiums and cattleyas bought rootless. I use lava rock as a medium so I always need to place that top layer on carefully so as not to harm the roots but bark shouldn't be a problem.
If there are some roots, the oncidium should recover without problem. Placing a bag over the pot to retain moisture is fine as long as your medium doesn't stay too wet (and rot out remaining roots). When you water, let it soak, then let it dry complety before watering again. Good luck!
Last edited by Leafmite; 07-31-2012 at 08:34 PM..
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