Verbascum thapsus L.
Common Mullein, Great Mullein, Aaron's Rod, Adam's Flannel, Wild Verbascum
Leiosandra cuspidata, Thapsus linnaei, Thapsus schraderi, Verbascum lanatum, Verbascum simplex
Bloom Time: Summer
Verbascum thapsus is a hairy biennial plant that grows up to 6.6 feet (2 m) tall. It forms a rosette of leaves in its first year of growth. The second-year plants typically produce a single unbranched stem. Leaves are large, up to 20 inches (50 cm) long. Flowers are small, yellow, and densely grouped. The flowering lasts up to 3 months, from early to late summer.
USDA Hardiness Zones 4a to 10b: from −30 °F (−34.4 °C) to 40 °F (+4.4 °C).
How to Grow and Care
Mullein needs a spot with full sun or partial shade and sandy or loamy soil that drains well. The roots are likely to rot in wet soil. A slightly acid pH is a plus but not absolutely necessary. Rich soil leads to sprawling plants and weak stems that are likely to flop.
Trim established Mullein to neaten them in early spring. If you set out new plants in spring, water them weekly for the first month if it hasn't rained. Established plants rarely need watering in spring. Before the end of spring, mulch around the plants to moderate the soil temperature, discourage weeds and prevent seeds that fall to the ground from making contact with the soil. Species varieties self-sow readily, but hybrids don't.
Stake tall Mullein before the spikes become heavy with flowers. Tie the spikes loosely to the stake so they can move with the wind. Once the flowers fade, cut off the spike at the base. This extends the flowering season and prevents self-sowing. Although Mullein tolerates drought, the plants look their best if you water them during prolonged dry spells. Apply the water slowly, allowing the soil to absorb as much as possible. This encourages deep, spreading roots.
See more at How to Grow and Care for Mullein (Verbascum)
- Back to genus Verbascum
- Plantopedia: Browse flowering plants by Scientific Name, Common Name, Genus, Family, USDA Hardiness Zone, or Origin
Click on a photo to see a larger version.
We participate in the Amazon Services, LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliate sites.