Crassulaceae
Cobweb Houseleek: Ground Cover Plant
Sempervivum arachnoideum
Grow in full sun to partial shade in fast-draining soil, watering only once the substrate has dried out completely. It thrives outdoors in cold climates and is a low-maintenance staple for rock gardens.
Every 14 days
Bright indirect
-32° - °C
% - %
Categories
What is Cobweb Houseleek?
Cobweb Houseleek (Sempervivum arachnoideum) is a easy-care plant from the Crassulaceae family. Sempervivum arachnoideum, the cobweb houseleek, is a compact alpine succulent whose tight rosettes are laced with fine white webbing, giving each cluster a spiderweb-like appearance. Native to the mountains of Europe, it is remarkably cold-hardy and spreads into dense mats via offsets ("chicks").
Cobweb Houseleek grows up to 13cm, spread of 30cm, watering every 14 days. It is suitable for indoor environments and safe for pets.
Unlike many tropical plants, Cobweb Houseleek tolerates watering mistakes. Best for beginners. Unlike many popular species, Cobweb Houseleek is safe to keep around pets. Without adequate drainage, root rot can develop within 28 days.
How to Care for Cobweb Houseleek?
TLDR: Cobweb Houseleek needs Bright indirect, watering every 14 days, and temperatures between -32-30°C with 40-70% humidity.
How Often Should You Water Cobweb Houseleek?
Water deeply, then let the soil dry out completely before watering again; cut back watering drastically in winter while the plant is dormant.
How Much Light Does Cobweb Houseleek Need?
Prefers full sun but tolerates partial shade in very hot climates, which helps prevent leaf scorch.
What Is the Best Soil for Cobweb Houseleek?
Use a sandy, fast-draining soil with a pH between 6 and 8; adding coarse grit or pumice improves drainage.
What Pot Should You Use for Cobweb Houseleek?
A shallow, wide unglazed terracotta or ceramic pot with generous drainage holes.
What Is Cobweb Houseleek and Where Does It Come From?
Sempervivum arachnoideum, the cobweb houseleek, is a compact alpine succulent whose tight rosettes are laced with fine white webbing, giving each cluster a spiderweb-like appearance. Native to the mountains of Europe, it is remarkably cold-hardy and spreads into dense mats via offsets ("chicks").
How to Propagate Cobweb Houseleek?
Offset (chick) division
Use clean tools and avoid watering immediately after planting to prevent rot.
- 1 Wait until offsets ("chicks") reach at least 2 cm in diameter
- 2 Carefully detach the chick from the mother rosette using a clean knife
- 3 Let the cut callous over for 1-2 days before planting
- 4 Plant in well-draining soil and water lightly after a few days
Materials needed:
How Big Does Cobweb Houseleek Grow?
TLDR: Cobweb Houseleek can reach up to 13cm tall with Medium growth rate.
Max height
13cm
Spread
30cm
Growth rate
Medium
Foliage
Evergreen
Plant Uses
Ornamental
Great for decoration
Ground Cover
Soil coverage
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Cobweb Houseleek?
TLDR: Cobweb Houseleek is susceptible to 8 known diseases. Monitor regularly for early detection.
Mealybugs
Mealybugs are small, soft-bodied insects covered with a white, waxy, cottony material. They are common pests of houseplants and outdoor plants in mild climates. These sap-sucking insects feed on plant tissue, causing damage, stunted growth, and can lead to plant death if left untreated. They produce sticky honeydew which attracts sooty mold.
Root Rot
Root rot is a serious fungal disease that affects the root system of plants, causing them to decay and die. It is primarily caused by overwatering, poor drainage, or soil-borne fungi such as Pythium, Phytophthora, Rhizoctonia, and Fusarium. The disease thrives in waterlogged conditions where roots are deprived of oxygen, making them susceptible to fungal infection.
Spider Mites
Spider mites are tiny arachnids (less than 1/20 inch long) related to spiders and ticks that feed on plant sap. They thrive in hot, dry conditions and can cause significant damage to ornamental and vegetable plants. During severe infestations, crop losses can reach 14% or higher as these pests disrupt vital plant processes including photosynthesis, carbon dioxide absorption, and transpiration.
Aphids
Aphids are small, soft-bodied, pear-shaped insects (1/16 to 1/8 inch long) that feed by sucking nutrient-rich sap from plants. They reproduce rapidly and can quickly weaken plants, causing distorted growth and transmitting plant viruses. Aphids come in various colors including green, black, red, yellow, brown, and gray. They secrete honeydew, a sticky substance that attracts ants and encourages sooty mold growth.
Meaning & Symbolism
Symbolizes protection and longevity; historically planted on rooftops across Europe to ward off lightning, tied to the idea of eternal life (from Latin "sempervivum").
Compare with similar plants
| Attribute | Difficulty | Light | Watering | Pet Safe |
|---|---|---|---|---|
| Field Maple | Easy | Bright indirect | 14d | ✓ |
| Silver Birch | Easy | Direct sun | 14d | ✓ |
| Common Blanketflower | Easy | Direct sun | 10d | ✓ |
| Cushion Bush | Easy | Direct sun | 14d | ✓ |