How to Grow Arctic Snow Mullein
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Arctic Snow Mullein
Verbascum bombyciferum 'Arctic Snow'
flowerArctic Snow is a stunning biennial or short-lived perennial mullein featuring tall spikes of pristine white flowers held above silvery-white, woolly foliage. The plant creates a dramatic architectural presence in garden beds with its candlestick-like flower spikes reaching 4-6 feet tall. It's valued for its striking silver-white appearance and long bloom period throughout summer.
When should you plant Arctic Snow Mullein in your zone?
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Example Arctic Snow Mullein timeline · Pittsburgh, PA (Zone 6b)
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Plant Arctic Snow Mullein
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Arctic Snow Mullein blooms
Mid-to-late summerBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Arctic Snow Mullein dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 4-9, with best performance in zones 5-8
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Get my Arctic Snow Mullein timeline →Growth Stages
Germination & Seedling
3-4 weeksTiny seedlings emerge with true leaves appearing fuzzy. Plants develop a basal rosette of silvery-white, woolly leaves close to the ground.
Keep soil lightly moist but not waterlogged. Ensure bright light. Thin seedlings to prevent damping off. Avoid overwatering.
First Year Rosette
6-10 monthsPlant forms an impressive mounding rosette of soft, silvery-white, felted foliage. Leaves are oblong-lanceolate and densely woolly. No flowers yet.
Water sparingly once established. Remove any competing weeds. Protect from excessive moisture. Mulch lightly around (not over) the base.
Bolt & Stem Elongation
3-4 weeksIn spring of second year, a tall, thick central flower stem emerges rapidly from the rosette, reaching 4-6 feet. Stem is covered in silver-white woolly hairs.
Provide sturdy staking if in windy locations. Reduce watering even further. Ensure excellent drainage. Stop fertilizing.
Flowering
6-8 weeksDense spikes of 1-inch pale white or cream flowers open progressively from bottom to top along the tall flower spike. Flowers attract pollinators.
Deadhead lower spent flowers to encourage upper blooms. Water only during extreme drought. Stake firmly if needed. No fertilizer required.
Seed Set & Maturation
4-6 weeksFlowers fade and give way to seed capsules. Foliage may yellow as plant diverts energy to seed production. Plant gradually declines.
Allow seeds to mature fully on the plant for self-sowing. Leave standing for architectural winter interest and wildlife cover. Harvest seed heads before splitting if desired.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick caterpillars; remove infested leaves; use neem oil if severe; encourage natural predators
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Ensure excellent air circulation; avoid overhead watering; apply sulfur dust or fungicide if needed; remove affected leaves
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Improve drainage; reduce watering frequency; plant in raised beds or containers with excellent drainage
Uses
Dramatic Garden Structure
OrnamentalArctic Snow provides exceptional vertical interest and architectural form in cottage gardens, dry gardens, and mixed borders. The silver-white foliage and tall flower spikes create striking focal points and lighting effects in landscape design. [source]
Pollinator Attraction
WildlifeThe abundant flowers attract bees, butterflies, and other beneficial insects. Seed heads provide food for birds and overwintering habitat for beneficial insects. [source]
Dried Arrangements & Craft Material
CraftDried flower spikes are excellent for dried flower arrangements, wreaths, and dried floral designs. The silvery seed heads add texture and winter interest to arrangements. [source]
Herbal Tea & Traditional Medicine
CulinaryVerbascum species have been used traditionally in herbalism for respiratory support. Flowers can be dried for tea (though Arctic Snow is primarily ornamental). [source]
Harvest Tips
Harvest seed heads in late summer or early fall when they've fully dried on the plant. Cut entire spike and hang upside-down in a dry location to further dry and extract seeds. Seeds are prolific and self-sow readily. Allow some heads to remain on plant for natural reseeding. Flowers are rarely harvested as they're valued for ornamental spikes rather than cutting.
Fun Facts
- 🌱 The name 'bombyciferum' means 'silk-bearing,' referring to the incredibly soft, silky woolly texture of the leaves and stems, which feels almost like flannel.
- 🌱 Verbascum has been used for thousands of years—ancient Romans dipped the dried flower stalks in tallow to make torches, earning it the common name 'Candlewick plant.'
- 🌱 Arctic Snow is a biennial that performs best when allowed to self-sow, as it can re-establish naturally year after year in ideal locations with good drainage and full sun.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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