Adults feed on pollen of goldenrods of the genus "Solidago". Emerges in April and feeds until June on "Rumex" and "Solidago". The larvae feed on "Solidago" and "Aster" species. Little to no differences were observed between "Solidago" and the subgroups in terms of karyotype. Usually the genus "Solidago", but species in "Chrysoma", "Euthamia" and "Oreochrysum" are also called goldenrods. The genus "Solidago" is monophyletic as indicated by morphological characters and molecular evidence. Edison decided on "Solidago leavenworthii", also known as Leavenworth's Goldenrod. The sweet goldenrod ("Solidago odora") is the state herb of Delaware. "Solidago gigantea" is highly invasive throughout Europe and Asia. "Solidago rugosa" is grown as an ornamental garden plant. "Solidago rugosa" is a variable plant throughout its range. Northern goldenrod ("Solidago multiradiata") grows to elevation, and has narrow leaves. "Solidago" species are perennials growing from woody caudices or rhizomes. Solidago gigantea is a North American plant species in the sunflower family. "Solidago gigantea" is the state flower of Kentucky and Nebraska.