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Semponium Diamond

x Semponium Sempervivum x Aeonium Diamond
Sempervivum x Aeonium

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An unprecedented plant, a cross-breeding between two genera: aeoniums and sempervivums, two rosette succulents. This variety was on the "Shortlist" of the Royal Horticultural Society for the Plant of The Year 2023 award. It forms a dense and conical compound tuft of light green rosettes bordered in red if exposed to the sun. It requires no maintenance or watering, only dry, lean soil, and some rain, even if it is scarce.
Height at maturity
40 cm
Spread at maturity
40 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -6°C
Soil moisture
Dry soil
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Best planting time April to May
Recommended planting time March to May
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Description

x Semponium 'Diamond' is the result of a unique cross-breeding between an Aeonium and a Sempervivum. Both succulent plants that are characterised by their rosette foliage. 'Diamond' has a dense and conical habit, consisting of several rosettes with thick leaves. They are contrasting, a fairly light and vibrant green surrounded by red margins if the plant is exposed to the sun. Its hardiness is estimated at -5ºC until further tested.

x Semponium 'Diamond' belongs to the family of Crassulaceae. It is the first hybrid between two genera of succulent plants: Aeonium and Sempervivum or houseleeks. The former are mainly native to the Canary Islands, but also to Madeira, Morocco, and Ethiopia. Aeoniums are magnificent perennials with rosette foliage, astonishing colours, and multiple forms. Houseleeks, on the other hand, are found naturally in rocky meadows, on rocks and scree, especially in mountainous areas. They display beautiful rosettes of green, golden, bluish, or reddish-purple tinted leaves. 'Diamond' grows up to 40 cm high with an equivalent width and produces numerous offsets. The leaves are quite rounded and pointed. They are thick and overlapping, without petioles, like an artichoke.

x Semponium 'Diamond', like its parents, is an excellent plant for dry or alpine rock gardens, in mild climates. Plant this perennial in full sun or partial shade in well-drained soil. It also thrives very well in pots and can be brought indoors to a conservatory in winter to protect it from the cold. It looks stunning in a container thanks to its sculptural design and conical habit. You can also grow it in a rock garden with houseleeks of various colours, Sedums, or Lewisia cotyledon with pink flowers.

 

Semponium Diamond in pictures

Semponium Diamond (Flowering) Flowering
Semponium Diamond (Foliage) Foliage
Semponium Diamond (Plant habit) Plant habit

Foliage

Foliage persistence Evergreen
Foliage colour variegated

Plant habit

Height at maturity 40 cm
Spread at maturity 40 cm
Growth rate fast

Botanical data

Genus

x Semponium

Species

Sempervivum x Aeonium

Cultivar

Diamond

Family

Crassulaceae

Other common names

Sempervivum x Aeonium

Origin

Cultivar or hybrid

Planting and care

x Semponium Diamond loves sunny spots and perfectly drained, moist to dry, poor, sandy or gravelly soils. You can plant it in spring or autumn in open ground or in a pot, adding gravel or coarse sand to the planting substrate, then it will need little care.

Outside of the mildest winter regions, it is best to grow this Semponium in a pot so that it can be overwintered under cover, protected from frost.

If you wish to multiply it, cut a few young rosettes and replant them elsewhere, barely burying the roots. Look after it by ensuring that it is not overwhelmed by taller plants and does not become covered in dead leaves or vegetation.

Planting period

Best planting time April to May
Recommended planting time March to May

Intended location

Suitable for Rockery
Type of use Edge of border, Container, Slope, Greenhouse, Conservatory
Hardiness Hardy down to -6°C (USDA zone 9a) Show map
Ease of cultivation Beginner
Planting density 5 per m2
Exposure Sun, Partial shade
Soil pH Neutral, Any
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 Needs to be stored

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