There are a couple of existing irises right in the middle of the grassy patch, which is one of the reasons I thought it would be a good spot for the new ones. Sigh, I haven't had much luck with irises, so it was a pleasant surprise to see these little survivors. No idea what they are, tho! And a couple of daylilies and oriental lilies, so I can't just hack and maim.
I did run the water for a while this afternoon, so we'll see what I can yank out. Then I may just drag out the grass killer!