Maurice - Unfortunately (or maybe fortunately) my daylilies are 98% hybrids grown from seed here in my yard. I might be able to share the names of some of the newer seedlings, but not the older ones (lost the tags and parent name trail long ago). So this is a case of possible genetics for me, not what the plant was used to. Which would probably mean that the genetics of that hybrid require colder winters/milder summers. But here is the other issue, some of those are in a partial shade area. They are planted with other daylilies in the same raised bed. The other daylilies seem to do well there, but these "dormants" don't. So ... over 75 degrees they may be struggling. You have shared some VERY interesting info about the experiments that Moldovan and Munson did. I, for one, would be interested in more discussion about this topic. Being a novice, I have a LOT to learn!
It probably would be a good idea to start a new thread about this string of discussion. Could we copy and paste the info that you already shared in this thread into a new thread? I know others would indeed be interested as this issue has come up before but the discussion didn't go as far. Do you want me to start a new thread or can you do it and post the thread link on this thread to redirect others there? I don't mind doing it, just let me know.