Fred, I'm over 100 miles south of you and those 100 miles make a critical difference. While you were having very cold temperatures last winter, my garden never got lower than 42 degrees. And, yes, I'm on a barrier island with water on both sides--ocean on one side, intercoastal waterway on the other. The island is very narrow right here--3 blocks wide. The water warms us in the winter, and cools us in the summer.
I don't mulch because with FL rain, rot can be a real problem. Also, shade or sun doesn't seem to matter. Most of my daylilies get some of shade from palm trees.
Cranky? I guess if failure to thrive makes them cranky, you are right. But I don't think this is really a wide-spread problem down here. If you go inland 40 miles (towards Orlando) the winters are cold enough that most SEV's aren't a problem.
Becky, I think of daylily classifications on on a sliding scale, with evergreen at one end and dormant at the other. The SEV's are somewhere on that sliding scale. Some plants are closer to EV than DOR, and others are closer to DOR. That's where my problem lies--I can look at parents till I'm blue in the face, but I can't tell which parent is dominant in influencing this issue. The only thing I can do is try this plant or that plant knowing that it's 50/50 if the daylily will succeed. That's why I shop on the Lily Auction--to minimize the pain to my wallet when a plant won't grow.
I remember having failure to thrive with one Stamile EV. Don't remember which one. Anyway, when I realized the daylily wasn't happy, I looked up the parents of that plant. Every one was a dormant but the child of those parents was classified as an EV. Didn't understand that one and in this garden it was doomed.