Last week I rented a cabin on Grindstone Lake in Northwoods Beach, WI. I put up two feeders as soon as I arrived, and had Rubythroats in about ten minutes. There were at least three hummers. There was no garden, but I noticed they occasionally visited the flowers posted. They look like a small wild snapdragon to me. All were in sand. Please excuse the amateur photography
When I travel, I too take a feeder. It is fun to see if you will attract anyone. The plant that you posted is a very common weed here. It is all over. I am not sure, but believe that it is linnaria. (spelling?) I have never seen the birds use it, but I am not at all surprised that they do. I have always thought that they would be using many of the wild legume species that we have such an abudance of. I am glad to know that they truely do use this plant.
Thank you for posting this.