From the Plant Pathologist: From my research I'm struggling to find any mycoplasma-like organisms that affect sedum showing those symptoms. There are a couple that describe proliferation of the plant, reddening/yellowing of the plant (unnamed phytoplama), stunting, twisted flowers (Spiroplasma citri). Did they have any more specifics than just that? I reached out to a listserve of plant diagnosticians and am coming up empty so far.