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Helleborus x hybridus Frozen Sven

Helleborus orientalis Frozen Sven®
Lenten Rose

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More information

A hellebore with cup-shaped flowers that are almost black, barely warmed by orange reflections. The particularly dark colour of the petals contrasts with almost white stamens. This hardy perennial can be grown in borders and under shrub beds, as well as in pots. Easy to grow, even in heavy soil, it will thrive in shade or non-scorching sun.
Flower size
6 cm
Height at maturity
45 cm
Spread at maturity
45 cm
Exposure
Partial shade, Shade
Hardiness
Hardy down to -29°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time January to March, September to December
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Flowering time February to April
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Description

Heleborus x hybridus 'Black' is a variety of Christmas rose that is particularly dark, with almost black single cup-shaped flowers only slightly warmed by orange highlights. The dark colour of the petals contrasts with almost white stamens at the centre of the flower. This robust and very hardy perennial can be grown in borders and under shrub beds, as well as in pots to decorate the terrace or balcony. Easy to grow, even in heavy soil, it will thrive in shade or non-scorching sun.

 

Originating from Greece, Turkey, and the central and eastern Caucasus, Oriental Hellebore, sometimes called Lenten Rose, is a perennial plant in the Buttercup family that hybridizes very easily with other species to produce many hybrids with varied colours and forms. No variety names are given to these hybrids, they are distinguished by their shape and colour characteristics. Oriental Hellebore is a hardy plant that can withstand temperatures down to -15°C (5°F), naturally growing in forests, thickets, and clearings up to an altitude of 2,000 m (7ft). The 'Black' variety forms a compact and leafy clump about 40 cm (16in) in all directions. It consists of palmate, evergreen basal leaves, slightly toothed, dark green and shiny, 30 to 40 cm (12 to 16in) long, composed of 7 to 9 leaflets. They only live for 8 months and are regularly replaced by new leaves.

Between February and April, clusters of flowers 5 to 7 cm (2 to 3in) in diameter form, simple and cup-shaped with a very light bouquet of stamens at their centre. They are inclined downwards, allowing water to slide off like an umbrella to protect the heart of the flower from rotting. The Hellebore is a plant that does not like to be moved once established, as the young plants take some time to flower. The seeds are sown by ants.

Use hellebores like the elements of an old tapestry, mixing them with woodland plants in brighter colours. They are highlighted when planted near Pieris, moderate-sized rhododendrons, under conifers (especially on windy sites), and surrounded by primroses, wood anemones, corydalis, dicentras, cardamines, or spring-flowering bulbs and snowdrops. You can also accompany them with ferns and shade-loving irises to create a beautiful contrast a little later in the season. They can be planted in groups, like a bouquet, in shade near the entrance of the house to enjoy their early flowering up close. They are suitable for cut flowers and in beds, borders, or even containers... Over time, Hellebore flowers do not wilt like the majority of other flowers but dry up, often in beautiful shades.

Each seed-sown Hellebore has a unique flower colour: so slight variations in colour may exist between two plants, which is normal and unavoidable. However, if the difference is too significant and distorts the desired effect, we will refund or replace the affected plant.

Flowering

Flower colour two-tone
Flowering time February to April
Flower size 6 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Evergreen
Foliage colour green

Plant habit

Height at maturity 45 cm
Spread at maturity 45 cm
Growth rate normal

Botanical data

Genus

Helleborus

Species

orientalis

Cultivar

Frozen Sven®

Family

Ranunculaceae

Other common names

Lenten Rose

Origin

Cultivar or hybrid

Product reference20895

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Planting and care

Helleborus x hybridus Black grows in any rich, light or clayey soil, without too much limestone, in partial or light shade, sheltered from cold and prevailing winds. Avoid direct sunlight during the hottest hours in the south. This perennial can be planted from early autumn to spring, between February and April. It thrives in deeply worked soil mixed with organic matter. To feed, use bone meal or another organic fertilizer. Water well after planting and then add a layer of mulch 2 to 5 cm (1 to 2in) thick. Regularly remove faded leaves to improve flowering. Make sure to maintain a planting distance of 30 to 40 cm (12 to 16in) between each plant to promote their development. Hellebore does not tolerate stagnant water which may cause rotting.

 

The roots should not completely dry out in summer. Hellebores can be affected by a fungal disease transmitted by aphids, called black spot. Remove old leaves from deciduous species or spotted leaves from evergreen species when flower buds appear. Remove faded flowers after the seeds fall. They can also suffer from grey rot or die from collar rot due to poor growing conditions, in excessively wet situations.

On a balcony or terrace, plant them in pots 4 to 5 times larger than their size, as they need space to develop their root system. Most hellebores can withstand temperatures down to -15°C (5°F) without suffering, allowing them to adapt to almost all regions.

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Planting period

Best planting time March, October
Recommended planting time January to March, September to December

Intended location

Suitable for Shaded rockery, Woodland edge, Undergrowth
Type of use Border, Edge of border, Container
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Planting density 6 per m2
Exposure Partial shade, Shade
Soil pH Acidic, Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil, rich in humus and light

Care

Pruning instructions Remove the old leaves from deciduous species or the stained leaves from evergreen species, when the flower buds appear. Remove faded flowers after the seeds fall.
Pruning Pruning recommended once a year
Pruning time January to March
Disease resistance Good
Overwinter Can be left in the ground

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