Are they useful or just looking yellow?From the side yard:
View attachment 3618153
The yellow daisy/sunflower ones are sunchokes (Jerusalem artichokes), I'm sure everyone recognizes the goldenrod (we have two species here), and the light purple flowers in the back are phlox.
My land is being swamped with Giant Ironweed:
https://en.wikipedia.org/wiki/Vernonia_gigantea
No real use, but it supports beautiful butterflies