How to Grow Verbascum
Verbascum
Verbascum spp.
flowerVerbascum, commonly known as mullein, is a tall biennial or short-lived perennial flower with distinctive large, fuzzy basal leaves and striking spikes of yellow, pink, purple, or white flowers. These dramatic plants are beloved by pollinators and add vertical interest to garden borders and naturalized areas. They are exceptionally hardy, drought-tolerant once established, and require minimal maintenance.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 3-9; thrives in cooler to temperate climates and tolerates poor conditions
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Growth Stages
Seedling
3-4 weeksTiny seedlings emerge with cotyledons and first true leaves forming. Very slow initial growth in first weeks.
Keep soil consistently moist but not waterlogged. Provide bright light. Thin seedlings to prevent crowding if direct sown. Protect from damping-off disease.
Rosette Formation (First Year)
8-12 weeks (rest of first season)Plant develops large, fuzzy basal leaves in a distinctive rosette pattern. Growth is vertical-limited; most energy goes to leaf production. Plant builds strong root system.
Maintain moderate moisture during active growth. Reduce watering as plant matures. Avoid overhead watering to prevent leaf diseases. Remove any flower spikes that form prematurely on biennials.
Bolting and Flowering
6-10 weeks of floweringCentral flower spike (or multiple spikes) emerges and elongates dramatically. Densely-packed yellow, pink, purple, or white flowers open from bottom to top along the spike(s). Plant height ranges from 2-6 feet depending on variety.
Provide sturdy staking for tall varieties in windy locations. Deadhead spent flowers to extend bloom and encourage side shoots. Reduce water; only water during drought. Watch for powdery mildew in humid conditions.
Seed Development and Maturation
4-6 weeksFlowers fade and develop round seed capsules along the spike. Foliage may yellow; entire plant hardens off. Seeds mature and dry on plant.
Stop watering unless drought conditions occur. Do not deadhead if you want seeds to develop; allow pods to dry fully on plant. Monitor for self-seeding if you wish to control spread.
Dormancy/Overwintering (Biennials)
3-4 monthsPlant dies back completely or goes semi-dormant. Seeds persist in soil or on dried seed heads. Perennial varieties may retain some evergreen foliage.
Cut back dead foliage or leave standing for wildlife shelter and seeds. In mild winters, perennial varieties may produce basal leaves. Ensure drainage to prevent root rot in cold, wet conditions.
Common Pests
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Monitor for leaf mines; remove affected leaves. Generally not serious. No chemical control necessary in most gardens.
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Spray with water to dislodge. Apply neem oil or insecticidal soap if infestation is severe. Improve air circulation.
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Use yellow sticky traps. Spray insecticidal soap or neem oil. Remove heavily infested leaves.
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Ensure good air circulation. Avoid overhead watering. Apply sulfur dust or baking soda spray (1 tbsp per gallon of water). Remove severely affected leaves.
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Improve drainage; amend soil with sand or grit. Reduce watering. Remove affected plants if severe. Choose well-draining locations for future plantings.
Uses
Respiratory and soothing tea
MedicinalVerbascum leaf is traditionally used to make herbal tea believed to support respiratory health and soothe throat irritation. The leaves contain mucilage compounds that may have demulcent properties. [source]
Traditional herbal preparation
HouseholdDried verbascum leaves and flowers have been used in folk medicine as infusions, tinctures, and poultices for centuries across Europe and Asia. Modern herbalism continues to explore these traditional applications. [source]
Pollinator magnet
WildlifeVerbascum flowers are beloved by bees, butterflies, and other pollinators. The dense flower spikes provide abundant nectar and pollen, making these plants excellent for supporting pollinator populations in gardens and naturalized areas. [source]
Herbal beverage
CulinaryFresh or dried verbascum flowers can be added to herbal tea blends for visual appeal and subtle flavor. Some culinary herbalists use flowers as a garnish or tea component, though they are less commonly used in cuisine than medicinal preparations. [source]
Dried flower arrangements
CraftThe tall, striking dried seed heads and flower spikes are popular in dried flower arrangements, wreaths, and botanical crafts. The architectural form and neutral tan color complement many design styles. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
For seeds: Allow flower spikes to fully dry on plant (late summer to early fall). Cut entire dried spike and place in paper bag to catch seeds as they dry further. Seeds are tiny and numerous. Collect before heavy rain or wind disperses them. For medicinal use: Harvest leaves in first year during rosette stage, before flowering. Dry leaves in bundles or on screens in shade. Harvest flowers when fully open for fresh use or drying.
Fun Facts
- 🌱 Verbascum was historically used to make torch wicks—dried flower spikes were dipped in tallow (animal fat) to create rustic torches, giving rise to the common name 'torchflower' or 'flannel flower.'
- 🌱 The fuzzy leaves of verbascum contain saponins, compounds that create a lather when crushed in water, and were traditionally used as a natural soap substitute for washing delicate fabrics.
- 🌱 Some verbascum species are considered invasive in certain regions due to their prolific self-seeding and ability to thrive in disturbed, poor-quality soils—a testament to their remarkable hardiness and adaptation.
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