Common Mullein (Verbascum thapis) is a biennial herbaceous plant in the family Scrophulariaceae, widely recognized by its tall, dramatic flower spike and densely woolly, grey-green leaves. It is one of the most conspicuous wildflowers of disturbed ground and open landscapes across Europe, Asia, and North America.
• First-year plants form a large basal rosette of thick, felted leaves close to the ground
• In the second year, a single erect flowering stem can reach heights of 0.5–2 meters, topped by a dense spike of bright yellow flowers
• The plant's dense covering of branched, star-shaped trichomes (hairs) gives it a soft, velvety texture and a silvery-grey appearance
• Known by many folk names including "great mullein," "Aaron's rod," "candlewick plant," "flannel plant," and "torches" — the last referring to the historical practice of dipping the dried flower stalks in tallow to use as torches
• One of the earliest colonizers of bare, disturbed soils, often among the first wildflowers to appear on burned, logged, or cleared land
분류학
• Introduced to North America by European colonists in the early 18th century, likely valued for its medicinal properties
• First recorded in North America around 1739 on the East Coast
• Has since become naturalized across virtually all of the United States, Canada, and parts of Mexico
• Also introduced and naturalized in Australia, New Zealand, and parts of South America
• The genus Verbascum contains approximately 360 species, primarily distributed across the Mediterranean region and western/central Asia, which is the center of diversity for the genus
• The species name "thapsus" is derived from the ancient Greek town of Thapsos in Sicily, where a related plant was known in antiquity
Root System:
• Deep, fibrous taproot that can extend 30 cm or more into the soil
• Enables the plant to access water and nutrients from deeper soil layers, contributing to its drought tolerance
Basal Rosette (First Year):
• Forms a large, flat rosette of leaves up to 45–60 cm in diameter
• Leaves are oblong to oblanceolate, 10–45 cm long and 3–12 cm wide
• Both surfaces densely covered with branched, felt-like trichomes (stellate hairs), giving a soft, woolly texture and grey-green to silvery appearance
• Leaf margins are entire (smooth, without teeth or lobes)
• Leaves are thick and spongy, with prominent parallel venation
Flowering Stem (Second Year):
• Erect, stout, and unbranched, typically 0.5–2 meters tall (occasionally up to 2.5 m)
• Stem is densely woolly with the same stellate trichomes as the leaves
• Cauline (stem) leaves are alternate, progressively smaller toward the apex, and decurrent (extending down the stem)
Flowers:
• Arranged in a dense, terminal spike (thyrse-like raceme) 15–50 cm long
• Individual flowers are actinomorphic (radially symmetrical), 1.5–3 cm in diameter, bright yellow (rarely white)
• Five petals fused at the base into a short corolla tube
• Five stamens: the upper three are shorter and densely covered with white woolly hairs; the lower two are longer and glabrous (smooth) — a key diagnostic feature of V. thapsus
• Flowers open sequentially from the bottom of the spike upward over several weeks
• Each flower opens for only a single day, typically in the morning
• Primarily pollinated by short-tongued bees and hoverflies
Fruit & Seeds:
• Fruit is an ovoid capsule, 6–10 mm long, densely covered with stellate hairs
• Capsule splits into two valves (loculicidal dehiscence) at maturity
• Each capsule contains numerous tiny, ridged, brown seeds — approximately 0.5–1 mm long
• A single plant can produce over 100,000 to 200,000 seeds
• Seeds remain viable in the soil seed bank for decades (reportedly up to 100 years under ideal conditions), germinating when exposed to light at the soil surface
Habitat Preferences:
• Roadsides, railway embankments, and field margins
• Burned areas, clear-cuts, and logged forest land
• Overgrazed pastures and abandoned agricultural land
• Gravelly or sandy riverbanks and dry slopes
• Limestone outcrops and rocky, calcareous soils
Soil & Light:
• Prefers dry to moderately moist, well-drained soils
• Tolerates a wide pH range but favors slightly alkaline to neutral soils (pH 6.0–8.0)
• Thrives in full sun; does not tolerate shade
• Highly drought-tolerant due to deep taproot and woolly leaf covering that reduces transpiration
Ecological Role:
• Pioneer species and early successional colonizer — among the first plants to establish on bare, disturbed ground
• Provides nectar and pollen for a variety of pollinators, including native bees, bumblebees, and hoverflies
• Seeds are consumed by finches and other seed-eating birds
• Host plant for the mullein moth (Cucullia verbasci) caterpillar, which can defoliate the plant
• The dense rosette leaves can suppress competing vegetation by shading the ground
• Generally unpalatable to grazing animals due to the irritating trichomes
Reproduction:
• Obligate biennial — completes its life cycle in two years
• Year one: vegetative growth (rosette formation)
• Year two: bolting, flowering, seed production, and death
• Reproduces exclusively by seed; does not spread vegetatively
• Seeds require light for germination, explaining why the species appears prolifically after soil disturbance
• Mass germination events can occur after fire, construction, or other ground-clearing activities that expose buried seeds to light
Light:
• Requires full sun — at least 6–8 hours of direct sunlight daily
• Will not thrive in shade or partial shade
Soil:
• Prefers poor to moderately fertile, well-drained soil
• Tolerates sandy, gravelly, rocky, and calcareous soils
• Does not require rich or heavily amended soil; excessive fertility can reduce vigor
• Avoid heavy clay or waterlogged soils
Watering:
• Highly drought-tolerant once established
• Water sparingly; overwatering is more harmful than underwatering
• Seedlings require consistent moisture until the taproot is established
Temperature:
• Hardy in USDA zones 3–9
• Tolerates extreme cold (down to approximately -35°C) and summer heat
• The woolly leaf covering provides insulation against both frost and heat
Propagation:
• By seed — the primary and most effective method
• Seeds are tiny and should be surface-sown (not covered) as they require light for germination
• Sow seeds in late autumn (for natural cold stratification) or in early spring after cold-stratifying in the refrigerator for 2–4 weeks
• Germination typically occurs within 14–30 days at 15–20°C
• Self-seeds prolifically; deadheading can prevent unwanted spreading
Common Problems:
• Generally pest- and disease-free
• Mullein moth (Cucullia verbasci) caterpillars can defoliate plants in late summer
• Crown rot in poorly drained soils
• Rust fungus (Puccinia verbasci) may occasionally affect leaves
• Considered invasive or weedy in some regions — check local regulations before planting
Traditional & Herbal Medicine:
• One of the oldest documented medicinal plants in European herbalism, with references by Dioscorides (1st century CE) and Pliny the Elder
• Leaves and flowers have been used traditionally as a remedy for respiratory ailments, including coughs, bronchitis, asthma, and chest congestion
• The flowers infused in olive oil have been used as ear drops for earaches (a traditional remedy with some modern clinical support)
• Leaf preparations have been used topically as poultices for wounds, burns, hemorrhoids, and skin irritations
• Contains bioactive compounds including saponins, iridoid glycosides (e.g., aucubin), flavonoids, and mucilage, which may contribute to its expectorant, anti-inflammatory, and demulcent properties
• The German Commission E has approved mullein flower (Verbasci flos) for use in treating catarrhs of the respiratory tract
Other Traditional Uses:
• Dried flower stalks dipped in tallow or wax were used as torches or lamp wicks in ancient Rome and medieval Europe — hence the common names "candlewick" and "torches"
• Leaves were placed in shoes as insulators against cold
• Native American tribes used the plant medicinally; the Zuni people applied poultices of powdered root to skin infections and used leaf decoctions for colds
• The dense, woolly leaves have been used as a natural toilet paper substitute and as tinder for starting fires
• Flowers yield a yellow to greenish-yellow dye used historically for coloring hair and textiles
Ecological & Garden Uses:
• Valued in pollinator gardens and habitat restoration projects for its long blooming period and attractiveness to bees
• Used in wildflower meadow plantings and naturalistic garden designs
• The tall, architectural flower spikes add vertical interest to informal and cottage-style gardens
• Seeds are an important food source for goldfinches and other seed-eating birds
재미있는 사실
Common Mullein's extraordinary seed longevity and prodigious seed output make it one of the most persistent plants in the soil seed bank: • A single plant can produce over 100,000 to 200,000 seeds • Seeds buried in soil can remain viable for an estimated 35 to 100 years, making mullein one of the longest-lived seeds in the soil seed bank • This remarkable dormancy explains why mullein suddenly appears in abundance after construction, excavation, or fire — the seeds may have been lying dormant underground for decades, waiting for the light exposure that signals germination The plant's dense covering of branched, star-shaped hairs (trichomes) serves multiple survival functions: • Reduces water loss by trapping a layer of still air against the leaf surface, minimizing transpiration • Deters herbivorous insects and grazing animals — the fine hairs can irritate the mouths and digestive tracts of animals • Reflects excess sunlight, protecting the leaf from heat damage • Provides insulation against frost In ancient Rome, the dried flower stalks of mullein were dipped in tallow and used as ceremonial torches. Roman women reportedly used the flowers to dye their hair blonde, and the plant was associated with the goddess Minerva. The mullein's strategy of producing vast quantities of tiny, long-lived seeds that germinate only when exposed to light at the soil surface is a textbook example of a "gap-detection" strategy — the plant has evolved to exploit newly disturbed ground before competing vegetation can establish.
더 보기
