Name: Marilyn, aka "Poly" South San Francisco Bay Area (Zone 9b) "The mountains are calling..."
I try not to plant the crown any deeper than 1/2" or so. Any deeper than that, if the seedling pulls itself down deeper, then it may not bloom. Any shallower than that, and it tends to fall over, maybe exposing its roots.
Evaluating an iris seedling, hopefully for rebloom