I don't think that any of those terms are useless. Not at all. I just think that there are variables. Some daylilies really are tender, and will not grow in very cold areas, or will grow for a while, and then die. Same goes for some of the dormants that are grown in a hot area. Many people in the North grow mostly dormants, and many people in the South grown mostly evergreens, even though many do well in both places. Some hybridizers living in a hot region will send their plants to a cold region, for evaluation, and some in a cold region will send theirs to a hot region, before introducing them. That way, they will have a better idea of how that plant will do in areas where it wasn't hybridized. For the longest time I would not buy a daylily that wasn't dormant, because of where I lived. When I decide to take a chance on evergreens, I bought them from someone local who had been growing the plant for a while. The ones I bought did really well, but the seller told me that she had problems with some of the other evergreens, and wouldn't recommend them because of that. Honesty is priceless, and saved me a fortune!
Bloom times are also not useless. If you are living in the same area as the hybridizer, you can expect pretty much the same bloom times. Areas that are in the same zone can expect close to the same bloom times. For everyone else, things can really vary. But, I don't think it is useless information!
