Ysa I have always heard that Oncidium Psychosis Mendenhall and Oncidium Papiliio hate to have their roots disturbed also. My experience is the same as yours and I have only repotted twice in about 4 years now. I currenly have 3 spikes on my Mendenhall and those flowers are a great and frequent favorite of mine!
Last edited by alsorchids; 11-07-2010 at 11:41 PM..