Bonnie, thanks for your comments. I know the problem with "look too much like another" - there are many daylilies that fall into that category.
But what I am looking for here is tips to help me cull BEFORE the seedlings ever bloom. (Because I will need the space... Also, as one daylily person pointed out, it is a lot easier to get rid of a seedling with poor foliage or other plant habits
before it blooms, because if it blooms with a pretty face, you're going to want to hold onto it - when you really shouldn't.)
So, in that vein, Lucy answered with "lack of growth" and "foliage is messy".
That leads me to further ask, what kind of growth should I be looking for, and what constitutes "messy" foliage? (Because, to be honest, I am not that impressed with iris foliage. I am not that impressed with a lot of
daylily foliage, either, so no discrimination here.)