When I had taken the photos of the blister beetles, there were a LOT of them. As I didn't know anything about them, I didn't think much about it. Later when I was reading about the insects, it was said they are a pest that can eat quite a bit. Oh...
After the flowers in the patch started blooming, I went back more often and never noticed anything missing. I expect holes in leaves, and quite a bit of munching goes on back there, but no mass devastation.. Besides the seeds we spread, there are some seedlings we put back there, Prairie Spiderwort, Yellow Giant Hyssop, White Sage, ... Beardtonges... oh, I cannot remember it all. And as suddenly as the Blister Beetles appeared, they disappeared again.