Well, the yellow one has a couple of crosses on it so it will stick around, at least for awhile. Truth be told, anything that hasn't already been tossed will probably make it to next year. 10T-05a is a pretty iris, but it looks a LOT like its other parent, Peace Prayer.
I think the seedling has better form and substance, but its branching may not be as good so it's a bit of a wash. Then again, many named iris had horrendous branching this spring, likely because of the repeated bouts of sub-freezing weather we had in April and even into early May (it even snowed a little on May 1!). So, I tried not to judge the seedlings too harshly on that aspect this year.
