I've discussed this very fact with agronomists who are into things like "hanging baskets", etc. and we suspect that plant genetics has been at fault here. When you breed plants down to the point where the Potinara (Brassavola x Cattleya x Laelia x Sophronitis) has been bred, lotsa things go by the way. Hardiness is often one of those things. Many of us orchid growers choose the species orchids for just this reason. When an intergeneric hybrid fails you, it sometimes may be that its requirements are so specific that only experts can grow it. Maybe that's what's going on here?
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