When you plan to purchase a particular daylily that is evergreen, look it up in the Plants Database here on garden.org.
In there you can scroll down until you see where it is listed, (for example look up Cleo), 10 members have this plant and 1 member wants this plant.
In this case of Cleo, the 10 members are from:
New York, Florida, Upper East Tennessee, Wisconsin, Southern Indiana, SW Wisconsin, SE Minnesota, Washington, South Dakota, and one is not listed.
There are a number of members here at garden.org that have Cleo and live in states that one may think evergreen DL's wouldn't be a good idea. I happen to own Cleo and it does very well in my zone 5a here in Wisconsin.
Also many have been featured as a "Daylily of the Day" here at garden.org. Watch for that too when you look up a daylily. You will read first-hand reports from members that own the daylily.
The thread "Daylily of the Day: Cleo" in
Plants of the Day forum
