One year, I had a beautiful yellow and white bloom on an iris seedling,
fairly tailored form, but not surprising for the cross. Then the rest
of the flowers opened....they were "normal" yellow. It was Roundup.
This year, the weeds were <so> out of control, it was impossible to see
the iris foliage & I knew I'd have Roundup damage. Remarkably not
nearly as much as I expected. Earliest blooms to open have had the
most, but even those are more like your His Highness. Only one or two
blooms really "artistic".