How to Grow Cobweb Houseleek Minor
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Cobweb Houseleek Minor
Sempervivum arachnoideum subsp. tomentosum 'Minor'
succulentCobweb Houseleek Minor is a diminutive alpine succulent forming tight rosettes densely covered in silvery-white, hair-like filaments that resemble cobwebs. This evergreen perennial produces tiny, star-shaped pink or red flowers on short stalks. It is an exceptionally hardy, low-maintenance plant perfect for rock gardens, containers, and alpine troughs.
When should you plant Cobweb Houseleek Minor in your zone?
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Example Cobweb Houseleek Minor timeline · Pittsburgh, PA (Zone 6b)
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Plant Cobweb Houseleek Minor
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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Harvest Cobweb Houseleek Minor
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; extremely cold-hardy and drought-tolerant
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Get my Cobweb Houseleek Minor timeline →Growth Stages
Rosette Establishment
3-4 weeksYoung plant develops a tight, flat rosette of fleshy leaves covered in characteristic white cobweb-like filaments
Keep soil barely moist for first 2-3 weeks; provide bright light; avoid overhead watering to prevent rot
Vegetative Growth
Several months to 1-2 yearsRosette expands and fills out; secondary rosettes (offsets) begin developing around the mother plant
Water only when soil is completely dry; ensure excellent drainage; provide full sun exposure
Flowering Preparation
2-4 weeks before floweringCentral rosette may develop a thicker, taller center as it prepares to flower; this rosette will be monocarpic
Continue minimal watering; do not fertilize; maintain full sun and excellent air circulation
Flowering
4-6 weeksCentral rosette produces a short inflorescence (1-3 inches) with 5-20 tiny, star-shaped pink, red, or coral flowers
Do not water the flowering rosette heavily; allow it to dry out gradually after flowering; provide full sun
Post-Flowering & Propagation
Ongoing renewal; offsets mature in 1-2 yearsAfter flowering, the central rosette dies back (monocarpic), but the plant survives through surrounding offsets that continue growing
Remove dead rosette; offsets mature over the next 1-2 growing seasons; detach and replant offsets if desired
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Remove with a dry brush or cotton swab dipped in rubbing alcohol; ensure very dry conditions to prevent reinfestation
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Prevent through excellent drainage and minimal watering; if detected, repot in fresh, dry soil and withhold water longer
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Spray with insecticidal soap or neem oil; rare on Sempervivum; usually not a serious issue
Uses
Rock Garden & Alpine Display
HouseholdCobweb Houseleek Minor is a classic alpine trough, rock garden, and scree garden plant, where its diminutive size and intricate webbed foliage create architectural interest and require minimal maintenance. [source]
Container & Specimen Gardening
HouseholdIts small, compact size makes it ideal for shallow pots, hypertufa containers, and bonsai-style displays. It thrives in well-drained potting mixes and adds striking visual texture indoors or on patios. [source]
Pollinator Support
WildlifeThe delicate pink and red flowers attract small bees and pollinators in late spring to early summer, supporting alpine and rock garden ecosystems with minimal input. [source]
Traditional Medicinal Plant
MedicinalHouseleeks have been used in traditional European herbalism as a topical remedy for minor cuts, burns, and warts due to their mucilaginous leaf tissue. [source]
Textural Ornament & Living Jewelry
CraftThe distinctive cobweb-like filaments and perfect symmetry make this species prized by succulent collectors and artists for living wall installations and decorative arrangements. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Sempervivum arachnoideum is ornamental; harvest by detaching mature offsets in spring or early summer. Gently twist or cut offset rosettes from the base and allow cuts to callus for 1-2 days before planting in dry, gritty soil. Flowers can be admired on the plant but have no culinary or medicinal harvest.
Fun Facts
- 🌱 The genus name Sempervivum means 'always living' in Latin, reflecting the plant's exceptional hardiness and ability to survive extreme alpine winters, including temperatures below -30°F.
- 🌱 The cobweb filaments are actual hairs (trichomes) that reflect sunlight and reduce water loss, allowing the plant to thrive in harsh, sunny alpine environments with minimal moisture.
- 🌱 Cobweb Houseleek is monocarpic, meaning the central rosette dies after flowering, but the plant never truly dies because it produces offset rosettes that replace the parent rosette—a form of vegetative immortality.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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