Plant Profile: Mullein (Verbascum thapsus)

A Traditional Plant for Respiratory Wellness and More

Mullein (Verbascum thapsus) is a biennial flowering plant that has been valued for centuries in traditional herbal practices. Known for its tall flowering stalk, soft velvety leaves, and bright yellow flowers, mullein has long been associated with supporting respiratory health, soothing irritated tissues, and promoting overall wellness.

For those interested in learning about plants, nutrition, and natural wellness, mullein is an excellent example of a plant that is easy to identify, simple to grow, and useful throughout nearly every stage of its life cycle.

Plant Identification

• Scientific Name: Verbascum thapsus
• Common Names: Mullein, Common Mullein, Great Mullein
• Plant Family: Scrophulariaceae
• Life Cycle: Biennial
• Native Status: Introduced to North America but now widely naturalized throughout Ontario and much of Canada.
• Preferred Growing Conditions: Full sun, dry soils, roadsides, meadows, disturbed ground, and open fields.

Growth Stages

First Year – Basal Rosette

During its first year, mullein forms a large rosette of soft, fuzzy leaves close to the ground.

Characteristics:

• Thick woolly leaves
• Deep taproot develops
• Energy stored for second-year flowering
• Leaves are commonly harvested during this stage

Second Year – Flowering Stage

In its second year the plant sends up a tall flowering stalk that can reach:

• 1–3 metres (3–10 feet)

Bright yellow flowers bloom gradually from the bottom upward over many weeks.

This stage provides:

• Flowers for herbal use
• Pollinator habitat
• Future seed production

Seed Production

After flowering:

• Flowers become seed capsules.
• Each capsule contains hundreds of tiny seeds.
• A single mature plant may produce over 100,000 seeds.

Seeds may remain viable in the soil for decades.

Harvesting Seeds

Harvest when:

• Seed capsules turn brown.
• Flower stalk dries.
• Capsules begin opening naturally.

How to harvest:

1. Cut mature flower stalks.
2. Allow them to finish drying indoors.
3. Rub capsules gently over a tray or paper.
4. Separate seeds from plant material.
5. Store in a cool, dry location inside labelled envelopes or airtight containers.

Parts of the Plant Used

Leaves

Most commonly harvested.

Traditionally used for:

• Herbal teas
• Steam inhalations
• Poultices
• Infused oils

Young first-year leaves are generally preferred.

Flowers

Bright yellow blossoms are collected throughout the flowering season.

Often used for:

• Herbal infusions
• Oil infusions
• Traditional ear oil preparations
• Skin care products

Root

Usually harvested during the first year before flowering.

Traditionally used in some herbal practices for:

• Joint support
• Musculoskeletal wellness
• Urinary health

Seeds

Historically used in limited traditional applications.

Note: Seeds contain compounds that can be toxic if consumed in significant amounts and are generally not used internally.

Vitamins Found in Mullein

Although mullein is not typically consumed as a major food source, it contains several nutrients.

Vitamin A (Beta-Carotene)

Supports:

• Healthy vision
• Immune function
• Skin maintenance

Vitamin C

Supports:

• Immune health
• Collagen production
• Antioxidant protection

Vitamin E

Supports:

• Cell membrane protection
• Skin health
• Antioxidant activity

Small amounts of B Vitamins

Including:

• Vitamin B2 (Riboflavin)
• Vitamin B3 (Niacin)

These contribute to normal energy metabolism.

Minerals Found in Mullein

Mullein contains modest amounts of important minerals, including:

Calcium

Supports:

• Bones
• Teeth
• Muscle function

Magnesium

Supports:

• Muscle relaxation
• Nervous system
• Energy production

Potassium

Supports:

• Healthy blood pressure
• Muscle contractions
• Hydration balance

Iron

Supports:

• Oxygen transport
• Healthy red blood cells

Manganese

Supports:

• Bone formation
• Antioxidant enzyme function

Zinc (small amounts)

Supports:

• Immune function
• Wound healing

Plant Compounds Found in Mullein

Mullein contains a diverse collection of naturally occurring phytochemicals.

Mucilage

One of mullein's best-known compounds.

May help:

• Coat irritated tissues
• Soothe the throat
• Calm dry coughs
• Support digestive comfort

Saponins

Traditionally associated with:

• Supporting mucus clearance
• Respiratory wellness
• Healthy lung function

Flavonoids

Including compounds such as:

• Apigenin
• Luteolin
• Hesperidin

Known for:

• Antioxidant activity
• Cellular protection
• Inflammation regulation

Phenolic Compounds

Help provide:

• Antioxidant protection
• Support against oxidative stress

Iridoid Glycosides

Including:

• Aucubin
• Catalpol

Studied for their potential roles in:

• Tissue protection
• Immune response
• Cellular health

Tannins

May contribute to:

• Mild astringent properties
• Skin support
• Digestive wellness

Traditional Medicinal Uses

Across Europe and North America, mullein has traditionally been used to support:

Respiratory Wellness

Traditionally used for:

• Dry coughs
• Bronchial irritation
• Hoarseness
• Throat discomfort

Often prepared as tea or steam inhalation.

Lung Support

Herbal traditions frequently use mullein to help:

• Loosen mucus
• Promote easier breathing
• Support healthy respiratory passages

Skin Care

Fresh or dried leaves have been used as poultices for:

• Minor skin irritation
• Insect bites
• Small wounds

Flower-infused oils have traditionally been applied to soothe dry or irritated skin.

Ear Comfort

Mullein flower oil has a long history in traditional herbal medicine as a soothing preparation for minor ear discomfort.

Anti-Inflammatory Support

The combination of flavonoids, iridoids, and antioxidants contributes to its long-standing traditional use in supporting the body's natural inflammatory response.

Digestive Support

The mucilage content may help soothe irritated digestive tissues and support gastrointestinal comfort.

Harvesting Tips

Leaves

Harvest:

• First-year plants
• Young healthy leaves
• Dry in a warm, shaded, well-ventilated location

Flowers

Harvest:

• Freshly opened flowers
• Daily during bloom
• Dry immediately to preserve colour and beneficial compounds

Root

Harvest:

• First-year plants in autumn
• Before flowering begins

Growing Mullein at Home

Although naturally found in fields and roadsides, mullein can easily be grown in:

• Raised beds
• Large containers
• Wildlife gardens
• Pollinator gardens
• Sunny outdoor spaces

It prefers:

• Well-drained soil
• Full sunlight
• Minimal watering once established

Because it self-seeds readily, allowing only a few plants to produce seed can provide future harvests for many years.

Why Learn About Mullein?

Learning about mullein helps us better understand how plants have supported human wellness through generations. While it should not replace professional medical care, it serves as an excellent example of the connection between nutrition, traditional herbal knowledge, and the remarkable diversity of naturally occurring plant compounds.

Its ease of identification, abundance, and long history of traditional use make mullein an excellent plant for anyone beginning to explore herbal wellness, sustainable gardening, and the relationship between plants and overall health.

Educational Disclaimer

This information is provided for educational purposes and is intended to encourage learning about plants, nutrition, and wellness—not to diagnose, treat, cure, or prevent disease. Always correctly identify wild plants before harvesting, use herbs responsibly, and consult a qualified healthcare professional before using herbal products, especially if you are pregnant, nursing, taking medications, or have existing medical conditions.