Richweed is a term that refers to a type of weed that grows abundantly in rich soils, particularly in agricultural areas. It is also known as gelder rose, swamp milkweed, and swampweed. Other synonyms for the term richweed include Joe-Pye weed, gravel root, trumpet weed, and queen of the meadow. These plants have clustered pink, purple, or white flowers that bloom from midsummer to fall and are often visited by butterflies and other insects. In some parts of the world, richweed is used for medicinal purposes, although it is generally considered a nuisance weed due to its invasive nature.