Sempervivum Arachnoideum – 4 Amazing Ways To Grow And Care For The Plant

Sempervivum Arachnoideum
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Sempervivum arachnoideum is an evergreen Perennial growing to 0.1 m (0ft 4in) by 0.2 m (0ft 8in).
It is hardy to zone 5 (UK) and is not frost tender. It is on leave all year, and flowers around July, and also in August, the seeds ripen. The plant is hermaphrodite in nature 1.e. (has both female and male organs) and pollination is done by an insect.

Sempervivum Arachnoideum

Suitable Soil: light (sandy) and medium (loamy) soils and prefers well-drained soil.

Appropriate pH: acid, basic and neutral (alkaline) soils and can actually grow in acidic soils.
It can not grow in the shade. It likes completely dry or wet soil and can tolerate dry drought.

Sempervivum arachnoideum has a cobwebbed rosette that does quite possibly in cold environments, also buried under snow! It grows most outdoors and has pink edges. It generates many “chicks.” It is monocarpic but will have several chicks before it dies.

Summary of Sempervivum arachnoideum

The Cobweb Houseleek Sempervivum arachnoideum is a little, evergreen seasonal succulent that grows in extremely limited rosette-forming floor coverings as much as 30cm (or more) in size, typically cultivated in rock gardens. It is a very variable species. There are even a dwarf and a crested form and they all hybridize conveniently for brand-new selections.

Sempervivum Arachnoideum

Rosettes: Each rosette is small and might have up to 50-60 leaves. Some for clusters of 1- 2 cm rounds, others have larger spheres. The tips of the leaves are attached with each other by a very fine cobwebbing that looks simply like cobwebs thin, however, there are several clones. Some are very hairy, others slightly hairy, there are also types that are red, some maroon, others green.

Flowers: Pink (usually) also bright-red or white about 1-2.5 centimeters throughout. Flowers are raised on thick 20 centimeters tall stems and hermaphroditical (having both male and female reproductive organs).

Blooming season: Summer, lasting into early fall. The rosette that grew then dies after setting seeds.

Interesting fact: In Europe, the houseleeks (sempervivums arachnoideum) are often used for roof covering, with the plants grown in between roofing tiles; they are believed to prevent or ward off lightning.

Care and Propagation Info

How to Grow and also Look After a Sempervivum arachnoideum (Cobweb Houseleek).

Sempervivum arachnoideum, commonly referred to as Cobweb Houseleek, is a variety of flowering plants in the household Crassulaceae, native to the Alps, Apennines, and the Carpathians.
It is a low-growing, evergreen, perennial succulent, forming a floor covering of fleshy rosettes up to 1.2 inches (3 cm) in size. Leaves are green or reddish, with cobwebby white hairs at the tips. Starry pink flowers are up to 0.4 inches (1 cm) in size in level cymes on stems as much as 5 inches (12.5 cm).

Due to the variability of Cobweb Houseleek, they conveniently adjust to the regional conditions, and due to the little genetics pool, they end up being a kind or variety quite very fast, flawlessly adapted to the neighborhood conditions of cold and heat in addition to the quantity of snow or rainfall and also at which times of the year.

Cobweb Houseleek creates the hereditary basis for many named varieties using their special qualities to influence the growing practices, flexibility, and also plain good looks. They are low hardy succulent enhancements to trough gardens, hole gardens, hypertufa pinch pots, and also a lot more succulent crafts.

General care of Sempervivum arachnoideum

Sempervivum arachnoideum is a cold-hardy succulent with cobwebbed rosettes. It functions effectively in vertical wall surface yards, such as the Grow Vert planter.

Relatively easy to grow in a container or a rock garden, scree bed, wall surface hole, trough, or alpine house. They are perfect in numerous ways, as they quickly start to create really tight clusters of rosettes, completing Sempervivum walls, mosaics, and topiary, and their coarse yet shallow root systems hold soil in position even in vertical plantings.

After the plant flowers and sets seed, it will certainly die, but there will be numerous offsets to take its place.

Plant Cobweb Houseleek in well-drained succulent soil mix in full sun to light color. Water on a regular basis during the growing period and permit the soil to dry out prior to watering again. Water extremely little throughout the cold weather.


Sempervivum arachnoideum ‘Cebenese’ has regular watering needs for a succulent. It’s best to use the “soak and dry” approach, and enable the soil to dry entirely in between waterings.

Where to Plant

Sempervivum arachnoideum is cold hardy, and grows fine when planted outdoors. It does well in complete to partial sun. Be sure to plant it in an area of your garden that gets at least 6 hrs of sunshine a day. It can additionally be grown in rock walls, upright yards, and also containers.

Pairs Well With Sedum reflexum

How to Propagate Sempervivum arachnoideum

Sempervivum Arachnoideum

Sempervivum arachnoideum ‘Cebenese’ can be propagated simply from offsets. Each “hen” (mother plant) will certainly generate a multitude of “chicks” (offsets), which can then be removed from the mother plant and potted or included in setups.


The plant will certainly produce little rosette offsets. Cut the offsets off from the main stem with a sharp, clean, and sterile blade or scissors. Permit the offsets to completely dry for one to 2 days prior to laying on well-draining soil.

Growing Conditions

Light: Complete sun to light shade.

Hardiness areas: USDA hardiness zone 5a– 8b.

Soil: Cobweb Houseleek, as with a lot of succulents, needs exceptional drainage. Poor, sandy soil would be just fine. You can work some peat into heavier soil, to lighten them and boost drainage.

Water: It needs routine watering in the growing period, an extremely little bit in wintertime.

Breeding: Circulate by seed sown in spring or root offsets in spring.
Insects and Troubles.
Cobweb Houseleek can get vine weevil and might be subject to rust.

Uses of Sempervivum arachnoideum

Sempervivum arachnoideum ‘Cebenese’ is a terrific succulent to use as a component of a “green roof covering.”.

Intriguing background

“Cobweb Houseleek” was believed to keep lightning and witches far from your home.

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