Karol's daylilies do wonderfully well in my zone 6/7 garden. I began following her hybridizing program a year or two before she had her first introductions, because of the clear colors.
Fifteen of hers grow here, and if there was more room, I'd grow more.
It's hard to pick a favorite but here are a few:
Blood,Sweat and Tears:
Born to Reign:
Cosmic Struggle: I picked this particular image to show the wonderful plant habits.
Flight Into Egypt - every bloom is always perfect on this one:
Filled to Overflowing:
Intelligent Design: The pattern is mesmerizing!
Heartbeat of Heaven:
Mount Ararat:
A seedling of Karol's. She remembered that I'd admired this in her garden in 2007 and sent me a piece of it several years later. Amazing lady!
Man of Sorrows:
I've added a couple new ones this year, but probably my current favorite of Karols is Desire of Nations: Love this one! It blooms ML here.