this smells more like citrus or orange - does that matter? Thanks.
I can't answer that, perhaps somebody in your region can help identify it. My only point is don't assume it is a problem, it could very well be a strong nectar being dried. I can spell the golden rod 25-30 feet from the hives. Try hooking up with some local beekeepers or club or Ag extension, they can probably give you a definitive identification.