Jacob's Ladder Picture and Link
I happen to really like Polemonium and have grown every new variety as it emerges from the breeder's trials. Here's a pic of one of the latest with some other thoughts here about growing this plant.
Easy to grow in part shade in fertile soil. Tough to grow in clay.
Easily divided in the early spring.
Great ferny foliage.
What's not to like in perennial flowering plant?