I agree, goldenrod gone to seed.
I always love the fall look of goldenrod and purple asters growing together in the roadsides. At one point I tried to duplicate it in my garden, by digging some goldenrod up from a roadside and bringing it home. In my good garden soil it went crazy and got amazingly tall. And then it started spreading itself all over by root and seed and trying to take over the yard. I ended up yanking it all out.