Mel, You have one tuff cat who chooses to chew/ignore Bitter Apple!
Re: Zygopetalums, I have a number of differences with the Basic Z Culture from Casa. Where are you located? That will help this discussion.
My greatest difference with the Casa recommendations is the potting media that I choose to use. My selection is the classic "Off" mix for standard Cattleyas. It contains much larger sized fir bark mixed with other ingredients. This works very well with the conditions that I provide.
I don't do well with many orchids. Phalaenopsis don't fare well here. I don't maintain the conditions which guarantee their best performance.
--Stitz--
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