Perhaps the raggedy shaped leaves give ragweed its name (see ragweed photo below).
When goldenrod is blooming, ragweed is also out. Although there are no showy flowers, ragweed pollen causes sinus allergies in many people. Do you have allergic reactions in the fall? The ragweed pollen travels far in the air, but it might help to uproot ragweed if you have it growing on your property.