Common Mullein

common mullein seedhead
common mullein rosette
common mullein flower

Common Mullein

Verbascum thapsus

Information Sheet (PDF)


Colorado List C – Control recommended


General

  • Biennial
  • Family: Scrophulariaceae (Figwort)
  • Introduced from Europe


Common names

  • Wooly Mullein


Habitat

  • Found in rangeland, pastures, open areas, disturbed sites and roadsides


Plant


Vegetation

  • Leaves get smaller as they grow up the flower stalk
  • Leaves oblong, blue-green, hairy, up to 5 inches wide and 12 inches long
  • Mature plants grow up to 8 feet tall


Roots

  • Tap root and fibrous secondary roots


Flower

  • Color: yellow
  • Season: June to September
  • Size: about 1 inch wide; tightly grouped flowers at the end of a stalk up to 6 feet tall


Seed

  • Seeds last up to 100 years in the soil
  • Up to 180,000 seeds per plant


Seedling

  • Rosette


Reproduction

  • Seed


Control


Biological

  • Gymnetron tetrum, seed weevil


Chemical


Cultural

  • Prevention – maintain health of site
  • Removal – flower and seed stalks should be bagged and disposed
  • Re-vegetation of highly disturbed sites


Mechanical

  • Burning - Not recommended; fire encourages plants to germinate
  • Grazing - Not recommended; most animals will not feed on the plant
  • Mowing - Not recommended; plants will regrow multiple stems and set seed


Use all chemicals according to the manufacturer's label. No specific recommendation or endorsement is made or implied by listing methods or products.