Because goldenrod has an unusual ability to crossbreed with other plants, there are at least 130 species of goldenrod in the United States alone. This herb is native to Europe and has spread to Asia, the Azores, and both North and South America.

European goldenrod is a perennial often found along roadsides and in open fields with single woody stems that grow to heights of 3 - 7 feet. Its yellow flowers, which generally appear in August and September, are only about ¼-inch wide but come in large clusters. Leaves alternate between toothed and smooth edges.

Contrary to popular belief, goldenrod does not cause hay fever. However, some people may have a skin reaction (allergic contact dermatitis) when they come in contact with goldenrod.