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Sempervivum arachnoideum Rubin

Sempervivum x arachnoideum Rubin
Cobweb Houseleek

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This houseleek is an adorable little succulent plant that can cover neglected, even arid, areas of the garden or rockery. It forms a beautiful carpet of rosettes turning bright purple in summer, covered in whitish filaments. Its red-pink flowering, with fleshy star-shaped blossoms, occurs on a beautiful summer day, like an unexpected gift. This perennial requires no maintenance. It tolerates dry, poor, siliceous or slightly calcareous soil, and relies on rainwater, even if it is scarce.
Flower size
3 cm
Height at maturity
10 cm
Spread at maturity
30 cm
Exposure
Sun
Hardiness
Hardy down to -29°C
Soil moisture
Dry soil
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Best planting time March, September
Recommended planting time March to May, September to November
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Flowering time June to August
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Description

With its regular shape and silky rosettes of bright purple, Sempervivum arachnoideum 'Rubin' is one of the prettiest varieties of houseleek. One beautiful summer day, like a lovely surprise, a small star-shaped flower spike of bright carmine pink emerges from the heart of the oldest rosettes. This houseleek is a small succulent plant ideal for arid and mineral areas. It requires nothing more than an open location. Without any maintenance, it miraculously survives almost without soil, in a dry, poor, siliceous environment, and relies on rainwater, even if it is scarce.

 

From the Crassulaceae family, the cobweb houseleek is proof that poor soil and a mineral landscape can accommodate beautiful specimens with vibrant colours. This sempervivum is quite variable in appearance. It lives on rocks or in scree, dispersing its fine seeds in crevices and clinging to the smallest fissures to slowly form small colonies of rosettes of different sizes. It has been hybridised with other species, producing beautiful varieties characterised by the presence of silky filaments on the foliage.

The hybrid cultivar 'Rubin' was selected in Germany in 1937. It was later awarded by the Royal Horticultural Society. Its juxtaposed rosettes are tightly packed, and do not exceed 10cm (4in) in all directions at maturity. Over time, it can form a creeping cushion through its stoloniferous stems, spreading up to 50 to 60cm (20 to 24in) on the ground, perfectly following the terrain. Resembling a slightly open artichoke, each perfectly organised rosette is composed of numerous fleshy, pointed leaves without petioles. The white threads, stretched between the central leaves, shine in the sun, as do the cilia that line them. The light purple colour of the leaves intensifies in summer. Flowering appears on rosettes aged 2 or 3 years, which will then disappear, having ensured the plant's perpetuity by producing several small rosettes on the periphery. The flower spikes develop in summer, formed by thick stems that bear 1 to 5 flowers with 8 to 10 petals of bright carmine pink. The roots of this perennial are thick and long. They penetrate deeply into rock crevices, ensuring a good attachment to the walls while drawing water from the depths.

 

Sempervivum 'Rubin' is a boon for gardens where the soil lacks thickness. It thrives where few species survive, colonising abandoned spaces. You can still enjoy this hardy perennial if your soil is poor, rather dry, stony, rocky, or even slightly chalky. It withstands temperatures below -15°C (5°F), requires no maintenance, and promises to bring life to any pile of stones, a low wall, or even a green roof. Houseleeks are easy-to-care-for succulent plants, offering flowers and foliage in various shades that create stunning compositions. Magnificent in pots, especially in low terrine-type pottery, they are irreplaceable in borders, troughs, or rockeries, alongside sedum, London pride (Saxifraga umbrosa), wall bellflowers, or Lewisia cotyledon. These miniature perennials quickly inspire the desire to multiply them. Consider choosing companions with staggered flowering times (thymes, Hertia cheirifolia, Saponaria ocymioides) and colourful foliage (Sedum spathulifolium) for a varied and joyful rock garden.

Sempervivum arachnoideum Rubin in pictures

Sempervivum arachnoideum Rubin (Foliage) Foliage
Sempervivum arachnoideum Rubin (Plant habit) Plant habit

Flowering

Flower colour pink
Flowering time June to August
Inflorescence Corymb
Flower size 3 cm

Foliage

Foliage persistence Evergreen
Foliage colour purple

Plant habit

Height at maturity 10 cm
Spread at maturity 30 cm
Growth rate slow

Botanical data

Genus

Sempervivum

Species

x arachnoideum

Cultivar

Rubin

Family

Crassulaceae

Other common names

Cobweb Houseleek

Origin

Alps

Product reference854061

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Planting and care

Sempervivum 'Rubin' likes sunny exposures and perfectly drained, moist to dry and poor soils, preferably without excess limestone. You can plant it in spring or autumn in open ground or in a pot, adding gravel or coarse sand to the planting substrate. Conversely, if you place it in a rock garden or on a wall, just give it a little compost to help it to establish itself. Afterwards, it will manage on its own. It only fears competition from taller plants, which create shade and moisture and compete with its growth.

If you wish to propagate it, simply cut a few young rosettes and replant them elsewhere, burying the roots just slightly.

Take care of it by ensuring it is not overwhelmed by taller plants, that it is not covered in dead leaves or vegetation residues, and by removing any faded inflorescences if necessary.

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Planting period

Best planting time March, September
Recommended planting time March to May, September to November

Intended location

Suitable for Rockery
Type of use Edge of border, Container, Slope
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Beginner
Planting density 5 per m2
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Chalky (poor, alkaline and well-drained), Stony (poor and well-drained)
Soil moisture Dry soil, Well-drained, poor.

Care

Pruning No pruning necessary
Disease resistance Very good
Overwinter Can be left in the ground

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