Sempervivum arachnoideum ssp. tomentosum

Cobweb Houseleek

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Cold-hardy succulent forming tight rosettes covered in white cobweb-like hairs. Ideal for rock gardens, requires full sun and excellent drainage to prevent rot.
yard Outdoor plants wb_sunny Sun pets Pet Friendly
info Pot sizes shown are estimations. Real dimensions may vary depending on the merchant.
Merchant Pot Size Availability Price
Amazon.com 1-2 in Out of Stock $7.69 Buy
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Plant Details

Common Name Cobweb Houseleek
Family Crassulaceae
Genus Sempervivum
Species Arachnoideum
Variety tomentosum
Origin Caucasus Mountains / Southern Europe
Blooming Pink star-shaped flowers on tall stalks in summer; monocarpic (mother plant dies after flowering)
Leaf Color Green with dense white cobweb hairs
Sunlight Sun
Category Outdoor plants
Pet Friendly check Yes
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Care & Maintenance

terrain
Soil

Very well-draining gravelly mix with perlite or pumice; mineral-rich substrate required

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Watering

Water sparingly during active growth; keep dry in winter dormancy. Avoid wetting center rosette to prevent rot

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Sunlight & Care

Requires full sun exposure to maintain compact growth and coloration; indoor placement needs maximum brightness

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Fertilization

Apply diluted succulent fertilizer once in early spring; avoid overfeeding to maintain slow growth

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Pruning

Remove dead flower stalks immediately after blooming as mother plant dies naturally. Remove offsets if desired

Pest Control Aphid Mealybug Scale Insect

These are the insects and pathogens that commonly interact with this plant, including pests, parasites, and organisms typically associated with its care.

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Seasonal Periods

local_florist Flowering Period 5 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 12 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
thermostat

Growing Parameters

thermostat
Temperature
14° – 86°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
20% – 60%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
3000 – 35000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
1200 – 3000
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
water
Soil Moisture
5% – 30%
% volumetric
Water content in the growing medium
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Soil EC
200 – 1500
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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