Diana Kulaga wrote:
Oncidiums grow "ladder
like", stepping up, in a way. They put out new growths from eyes on the
existing pseudobulbs, not from the center of the rhizome.


I had been wondering about this with my oncidium, which is my only, and
first, one. Hadn't been here in a while so I was interested to see
this discussion. I knew about potting the "back" of a sympodial orchid
at the edge of the pot but what I'd like to know with the oncidium is
how deep to re-pot it. If you want the roots from the higher new
growth to be at the right level for the compost, then you have to sink
the older bulbs into it, & doesn't that invite rot? Or, if you tried
to put all the p-bulb bases at compost level, then the whole thing
would be slanted over & look silly... Mine has space left in the pot
yet, but the way it's going, by the time it needs repotting, the new
shoots will be about an inch & a half above the pot. So, what is the
right way to repot them?
Thanks!

Alison