My North Wind Dancer does not flop, but the scapes do lean. They tend to wave a bit in a breeze (or "dance"). It has the perfect name and the flower petals also give it a very fluid graceful look. Of course it has won the top award, the Stout medal, which takes years for a cultivar to achieve. If the gardener likes day lilies with stiff scapes and rigid petals, you won't like North Wind Dancer. My clump is located at the NE corner of the house and catches a lot of breeze, wind also.
I hope to have a good picture of it in full bloom before long.