Verbascum thapsus is a fuzzy-leaved, herbaceous biennial in the Scrophulariaceae family. In its second year of growth, a flower spike emerges with bright yellow, densely clustered flowers. Although the plant is considered a weed that thrives in compacted, poor soils, mullein leaf has been traditionally used for its many beneficial attributes since the time of Dioscorides, over 2,000 years ago. Mullein herb can be macerated into mullein extract, brewed as mullein leaf tea, or made into syrup.