I have personally never done any air layering with deciduous greenery. I do believe when this is done, a cut is made into the side of the material to be rooted and sometimes the addition of a rooting hormone is used. For Phal spikes, I doubt it will work because the spike itself is not like that of shrubs, etc. I have used keiki paste and used at the proper time on a flower node, it will generate a new plant... just my thoughts, not they are worth even the 2 cents!
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