How to Grow Common Mullein

Common Mullein

Verbascum thapsus

flower

Common mullein is a biennial plant known for its tall, dense spike of yellow flowers and distinctive fuzzy, gray-green basal leaves. In its first year, it forms a ground-hugging rosette; in the second year, it sends up a thick, unbranched flower stalk that can reach 3-6 feet tall. Historically valued for medicinal purposes and traditional crafts, it's now often considered a wildflower or naturalized plant in many regions.

Growing Conditions

☀️

Sun: Full sun, 6+ hours daily; tolerates partial shade but flowers more robustly in full sun

💧

Water: Drought tolerant once established; minimal watering needed. Prefers dry to moderately moist soil; avoid consistently wet conditions. Established plants require little supplemental water.

📏

Spacing: 12-18 inches between plants inches

📅

Days to maturity: 365-730 days (biennial; flowers in second year)

🌱

Planting depth: Seeds: surface sow or lightly press into soil (requires light to germinate); transplants at soil level

Soil

Type: Well-draining, sandy or gravelly soil; tolerates poor, infertile soils

pH: 5.5-7.5

Amendments:

Minimal fertilizer needed Avoid heavy organic matter or rich soils Coarse sand or gravel if drainage is poor

Growing Zones

Find your zone →

Thrives in zones 2-9; extremely cold and heat hardy, widely naturalized across North America

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

Growth Stages

Seed Germination & Rosette Formation (Year 1, Weeks 1-12)

8-12 weeks

Tiny seedlings emerge with small, fuzzy leaves. The plant develops a dense basal rosette of thick, gray-green, felt-like leaves close to the ground.

Keep soil lightly moist until established. Thin seedlings to proper spacing. Provide full sun exposure. Minimal fertilizer needed; avoid overfeeding.

Rosette Development (Year 1, Months 2-12)

3-8 months

Leaves grow larger and more numerous, forming a substantial basal mound with silvery-gray foliage. Plant stores energy in roots and developing crown.

Allow dry periods between waterings. Remove any competing weeds. Protect from excessive moisture during winter dormancy. No staking needed at this stage.

Bolt and Stem Elongation (Year 2, Early Spring to Early Summer)

4-8 weeks

A tall, sturdy, unbranched flower stalk emerges from the rosette center, reaching 3-6 feet tall with leaves alternating up the stem. Stalk is densely covered in fine hairs.

In windy locations, provide loose staking or support when stem reaches 2 feet. Ensure good sun exposure for straight growth. Water during dry spells, but avoid overwatering.

Flowering (Year 2, Summer)

6-10 weeks

Dense raceme of yellow, five-petaled flowers opens gradually from bottom to top up the stalk over several weeks. Flowers are typically 0.5-1 inch in diameter.

Deadhead spent flowers lower on the spike to encourage prolonged blooming if desired, or leave them for seed set. Provide water during dry spells. Support tall stems if needed.

Seed Maturation and Decline (Year 2, Late Summer to Fall)

6-10 weeks

Upper flowers finish blooming; lower portions develop seed capsules containing hundreds of tiny seeds. Foliage may yellow and decline. Plant naturally dies back after seed dispersal.

Allow seed pods to mature and dry on the plant for self-seeding or seed collection. Cut stems at ground level after seeds drop or for next-season cleanup. Plant is often finished by first frost.

Companion Planting

Plan your garden →

Plant with:

Yarrow Black-eyed Susan Coreopsis Lavender Catmint Salvia Alchemilla Thyme Echinacea

Avoid planting near:

Plants requiring consistently moist soil Shade-loving plants Plants sensitive to allelopathic compounds Nitrogen-demanding vegetables

Common Pests

Usually not problematic. Hand-pick caterpillars if present; allow natural predators to manage populations. Rarely requires intervention in gardens.
Increase air circulation and humidity with occasional misting. Remove heavily infested leaves. Neem oil spray if severe.
Ensure good air circulation. Avoid overhead watering. Remove affected leaves. Sulfur dust or baking soda spray in severe cases.
and
Generally resistant due to fuzzy leaves. Physical barriers or organic slug pellets if needed.

Uses

💊

Respiratory & Throat Support

Medicinal

Mullein leaf tea and infusions have been traditionally used for coughs, bronchitis, asthma, and sore throat relief. The flowers are also brewed into soothing infusions. Compounds in mullein may help reduce inflammation in the respiratory tract. [source]

💊

Ear Oil & Topical Applications

Medicinal

Mullein flower oil (flowers infused in oil) is a traditional remedy for ear infections and ear pain. The oil is also used topically for minor wounds and inflammation. [source]

🏠

Natural Torch & Fire Tinder

Household

The dried flower stalks were historically used as candles (dipped in fat) or as tinder for starting fires due to their dry, fibrous nature and ability to hold a flame. [source]

🎨

Fiber & Dye Source

Craft

The silky hairs covering leaves and stems can be used to make natural dyes (producing yellows and greens) and the fuzzy leaves have been used as felt-making material historically. [source]

🦋

Pollinator & Beneficial Insect Support

Wildlife

Mullein flowers attract bees, butterflies, and other pollinators. The dense flower spikes provide excellent nectar and pollen sources in summer when other flowers may be scarce. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest leaves for tea or medicinal use in early second year before flowering begins, or during first year. Cut leaves in morning after dew dries. For flowers, harvest individual blooms as they open, or harvest entire flowering spikes. For seeds, allow pods to dry completely on plant, then harvest before they shatter naturally (typically September-October). Seeds will self-sow readily if left on plant.

Fun Facts

🌱 Mullein was used in ancient times as a 'candle plant'—dried flower stalks were dipped in animal fat to create rustic candles, and this practice gave it the nickname 'candlewick plant.'
🌱 The fuzzy leaves feel like flannel or felt and contain compounds that may have natural insecticidal properties, which is why they were historically used to line sleeping areas to repel insects.
🌱 A single mullein plant can produce over 100,000 tiny seeds, which explains why it has naturalized across multiple continents and is considered invasive in some regions; seeds remain viable in soil for decades.

Want personalized planting timelines?

Get started free