Wrinkles are due to lack of water at one point or another, and it is not actually normal.
Some oncidium types will plump up their pb upon good watering, but many do not. So once you get wrinkles, you live with them. Once watering is corrected, wrinkles do not harm the plant, but it is not normal.
Certain intergenerics that are less heat tolerant will wrinkle up even with good watering as plants lose more water than they can take up. This is called heat stress.
Many oncidium types that are sold at stores or nurseries, I don't ever see any wrinkled pbs.
Most of mine are wrinkle free, even the oldest tiny pbs.
The ones with wrinkles (that I have) are the ones with root damage ( not enough water taken up) or heat stress (more cool growing types that I have hard time with).
By the way, have you felt your oncidium's roots? Are they firm or soft?
If soft, then they are gone bad even if they may look good.
I really have no clue as to how to save your plant at this point other than guessing that you are probably seeing the result of bad roots not being able to take up enough water.
You mentioned that the moss was wet when you bought. Then it has stayed that way (you watering the plant even when the moss was still wet...)
I can't think of anything else.
Lower temperature is not an issue unless it is really low like below 55 or 40. 69 during the day is perfectly fine. plus lower temp has nothing to do with wrinkles. too high temp can though.
Switching it to s/h is not a good idea at this point. Just like repotting, switching plants to s/h is best done when plants are pushing new shoots and roots. The likelihood of success is higher that way.
Last edited by NYCorchidman; 02-03-2013 at 11:52 PM..
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