I've had a few daylilies that had weaker scapes then others. Nothing too horrible, and mostly (but not totally) on newly planted daylilies. I would say that a 2- 3 year wait and see period may be in order before we declare a daylily's scapes to be inherently weak....As to Sunfast versus Colorfast I can site a couple of examples of the difference from my own experience. By my definition sunfast refers to the substance of a daylily, whereas colorfast refers to it's color. America's Most Wanted had good substance that held up well in our hot summers. But the beautiful yellow coloring was totally bleached out to almost white by days end. It was Sunfast, but not Colorfast. In contrast Citrix retained its color throughout most of the day, but was a limp dishrag by early afternoon. So Citrix to me was Colorfast but not Sunfast......When I first got into daylilies, outside of rust, these other issues were seldom mentioned. It's nice to get a new pair of eyes asking new questions.........Maryl