Mullein Leaf, also known as Verbascum Thapsus, is an herbaceous biennial in the Scrophulariaceae family. While it is native to Europe and Asia, it can now be grown anywhere, and it crops up commonly in North America. The Mullein plant blooms with beautiful yellow flowers. Its soft, thick leaves have also been called Grandmother's Flannel.

The dried leaves can be brewed into an herbal tea or used to make oils and syrups.