I agree with Leafmite about buying plants from vendors that grow from their own flask, maybe do their own breeding, although nearly no vendor test their plants every 3 months or before shipping. Vendors like SVO or Rogue Orchids that have their own breeding programs are low risk. Hobbyist vendors like Diamond Orchids that have a small number of plants and occasionally do their own breeding are low risk. Vendors like Oscar Allen or Rare Earth that mainly propagate through divisions have some risk no matter how clean their operations are. Then there are vendors that primarily source from wholesale growers, like Seattle Orchids, Marlow's, Hausermann's, Norman's, etc., and I think this is where you'd find the most problems, especially with variegated and meristemmed plants. They might have a clean operation, but their sources may not, and they won't ever tell you who they buy from.
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