And practically the only longiflorum cultivar you will ever find in the USA is Nellie White. There use to be a few other longiflorum cultivars sold at Easter time, like Ace, but they have been gone for 30 years. Nellie White is shorter and more compact not because of genetics. All Nellie Whites are infected with Lily Symptomless Virus (LSV). It is this virus that caused them to grow shorter. I would suspect that if you did find and buy Nellie White, it would probably pass the virus to your other longiflorum cultivars in time, and to other lilies. Whether you would actually notice any symptoms, I am not sure.
