I have a field of say between one thousand and two thousand daylily clumps that I have grown for more than 20 years. I have seen similar scapes perhaps a handful of times. It is reasonably rare in my location and growing conditions.
Scapes develop over many months, depending on the temperatures. Since plant development depends on the environment, unusual changes in the environment may cause unusual effects. For example, plants may not be able to compensate for extremely high unexpected temperatures (heat shock) or extremely low unexpected temperatures (cold shock) that occur while the scape is developing. Those may cause unusual effects that become visible much later when the scape has completed enough development to appear.
