Re freezing, if the seeds are dry (e.g. air dried for a few weeks) first they should be able to survive freezing in a freezer. If they were still hydrated, however, then they may well die based on Dr. Griesbach's experiments back in the 1950's.
If they survive outdoors when they fall to the ground (and I've seen that happen) I'm speculating it may be because they were not plunged straight into a freezer. Going in a freezer would mean they went from whatever the current room or outdoor temperature was directly to -18C (0F).
A whole plant itself adjusts to decreasing temperatures (cold acclimation) following environmental cues that winter is approaching. That's why daylilies can survive extreme cold here in winter, but if you dug up that exact same daylily in mid-summer and put it straight in a freezer it would die.
If anyone wants to read more about the 1950's research on daylily seed germination/storage/freezing etc. there are articles on the AHS website here:
http://www.daylilies.org/AHSar...
The comment about freezing seeds, as long as they are "drier than usual" and in sealed containers is in the third article.
Maurice, the reason I tested some of the unopened pod seeds in peroxide was because soaking in H2O2 breaks daylily seed dormancy. I wouldn't have considered soaking in plain water because in my earlier tests that was detrimental to germination. My logic was that including a test that I knew would break seed dormancy would give a comparison to those in the unstratified controls and also show that the seeds in the group were viable and not removed from the pod too soon.
@Natalie may have tested "maturation drying" - her seeds were stored in the fridge, dried two or three days beforehand if I remember rightly and didn't germinate until water was added. At that point some germinate in the fridge. So there seemed to be a response to water (if I'm remember the sequence of events correctly).
Another potentially confounding factor with seeds is secondary dormancy, i.e. a seed can be not dormant and then develop secondary dormancy when exposed to some particular environmental condition, such as in high temperature induced thermodormancy - lettuce comes to mind.
Another is that a percentage of seeds in a given batch often don't behave the same, some can be dormant and some not. Griesbach found something like 45% were non-dormant in his tests (in that case he considered non-dormant meant germination within two weeks of planting). In my case I gave them a bit longer before classifying as dormant or not, and for at least a couple of batches of the specific seeds I used it was 25% not and 75% dormant. I don't know how one could make sure this wasn't due to different environmental conditions during maturation since the pods would not all have matured on the exact same day and an individual pod wouldn't contain enough seeds presumably.
