I don't
think my seedlings that went dormant indoors did so because of drought either, especially since some of the batch kept their green leaves even though they had a dormant bud. Just can't totally rule it out. But having said that, I know of other people who've had seedlings go dormant indoors, and Stout had it happen in a greenhouse and presumably he (or staff) didn't forget to water
I think that my seedlings did this in December. I can't compare with outdoors because outdoors here the daylilies in the garden would have died back from the cold by then regardless. Would yours have died back in December, earlier, later, or don't remember? Just interested in what the daylength and temperature would have been at the time.