Tall goldenrod is one of the most abundant and aggressive goldenrods in the Chicago area, popping up in garden beds and along roadsides. It is recognized by its height - four to six feet tall - its large attractive feathery blooms and willowy leaves thare are toothed along the upper half. The very similar Canada goldenrod does not get quite so tall and has leaves toothed along the entire margin and slightly smaller individual florets. This species is found throughout much of North America except the far West. It is much appreciated by bees, small butterflies and the cute little goldenrod beetles. As with other goldenrods, since it has heavy pollen, appreciated by insects, it does not cause hay fever. That honor goes to a completely different plant, ragweed.