Well, before the wildflower bed was put out, it was just an old farm field. Pigs I think actually! We bought the land from an old farmstead that had been here years and years in one family.
It was about 15 years ago or so I did that bed. I used round up to kills the weeds and field grasses and then roto'd the heck out of it for weeks. If I remember right that bucket of mix was supposed to have glads and daylilies in it. The only other thing might have been bird droppings, do they eat glad seed pod? Or rodents of any sort? Maybe a squirrel buryed something?
I honestly don't know, b/c like I said, we've been here 19 years and I know I didn't plant them. They just showed up about 3-4 years ago I think. the lupines were the same thing........in the mix, but never showed up till about maybe 6 years ago. Those are all over in there, and I really need to try to dig some of the smaller 1st year ones up too.
Sorry to ramble..........
They are irises not glads. 
