I have suggestions for rebloom in the north.
If you like smaller blooms, most of Martin Kamensky's (from Michigan) rebloom. You can see some of his at www.midaylilysociety.com the Southern Michigan Daylily Society website.
Ginny Pearce of Michigan, her hybridizing objective is to create very hardy, robust, and northern reblooming tetraploid daylilies with large flowers of great color, substance, and form displayed as a minimum of 20 buds per well-branched scape. She strives for overall plant performance to ensure a beautiful garden presence as well as valuable hybridizing genetics.
http://www.gardenpathperennial... ... I am probably creating more competition for myself, but she is ISIS on the auction.
Quite a few of Judy Davisson's introductions have rebloom power for me in zone 5. You probably all know that she is a Michigan transplant to NC.
Martin K recommended "Little Rosy Cloud" and "Frequent Flyer" to me, and both have dependable rebloom in my zone 5 garden. "little Rosy Cloud" is hard as nails with fantastic banching. Rebloom scapes are taller and I think have more branches than first scapes. Hard frost in Fall is the only thing that stops it.
My first registration "Woof Returns" can send up 3 sets of scapes. www.kathysearthlyarts.com Not cutting edge, but that's quite a feat in the thumb of Michigan. ;)
