Common comfrey - Symphytum officinale

"Symphytum officinale" is a perennial flowering plant of the genus "Symphytum" in the family Boraginaceae. Along with thirty four other species of "Symphytum", it is known as comfrey. It is native to Europe and it is known elsewhere, including North America, as an introduced species and sometimes a weed. The flowers are mostly visited by bumblebees.