By contrast, this plant is also known as “wooly” Mullein, referring to the lanceolate leaves that become rougher and more densely covered in small hairs during its vertical progression in the second year. The name of Verbascum, is a corruption of the Latin barbascum derived from the Latin barba, meaning beard, again characterizing the beard-like hairy filaments in the leaves. Its second name of thapsus likely derives from the Greek thapsinos, meaning yellow, describing its abundant bright yellow blossoms. The flowers are so richly endowed with yellow that they impart a golden color to boiling water—an infusion used in the Greco-Roman era to impart a light-filled hue to hair.
The tall inflorescences of yellow flowers on the Mullein are indeed impressive to experience. The higher the Mullein stalks grow, the longer they bloom. Well-developed strong Mullein plants develop not only a single candle-like stalk but also flowering side shoots that create a “candelabra” form. Hundreds of small yellow, 5-petaled flowers are grouped densely on each leafy spike. They bloom progressively throughout the summer and early autumn, growing from the bottom to the top in successive spirals. Each individual flower has a diurnal rhythm, opening before dawn and closing by mid-afternoon.