Halimiocistus sahucii
Halimiocistus sahucii
Halimiocistus sahucii
(x) Halimiocistus sahucii
sahuc rock rose
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Description
x Halimiocistus sahucii is a small bush resulting from spontaneous cross-breeding between Cistus salviifolius and Halimium umbellatus. The plant forms a low and wide dome and its thick foliage remains evergreen in winter. In spring, its growth is covered with a multitude of small white flowers with yellow centres, transforming it into a remarkably bright ball. Cistus plants not very resistant to severe frost. This attractive hybrid will make a great impression in rock gardens, on a dry slope, or mixed with other Mediterranean shrubs in a dry garden.
x Halimiocistus sahucii belongs to the Cistaceae family. Its first parent is the sage-leaved rock rose, which dots the dry slopes and woods of Mediterranean regions in Europe. The second parent is the rock-rose with umbels, specific to siliceous and rocky slopes. This branched, bushy shrub has a loose and spreading habit. It will reach about 50 cm (19.7 in) in height, with a diameter of 90 cm. Flowering occurs in spring or early summer depending on the climate (in May-June), and lasts for about three weeks. The flowers are round and fully open corollas, 3 cm (1.2 in) in diameter. They have 5 pure white petals surrounding a bright yellow centre. Each flower only lives for a day, covering the ground with its petals in the late afternoon, but it will already be replaced the next morning. The persistent foliage is composed of thick and wavy, oval, medium to dark green, hairy leaves, measuring 3 to 5 cm (1.2 to 2 in) in length. This variety can withstand short frosts of about -7°C (19.4 °F) once mature if planted in well-drained soil, sheltered from the wind.
x Halimiocistus sahucii is a plant for rock gardens and poor soils, well adapted to drought and coastal areas. Create a group, reminiscent of the garrigue, by mixing the foliage and scents of lavenders (blue, white, pink), rosemary (creeping or upright), thymes (T.vulgaris, T. polytrichus), salvias (Salvia x jamensis or officinalis), oreganos, teucriums (T.chamaedrys, T. x lucidrys, T. hircanicum), catmints, ballotes and dryland spurges (E.characias, E. cyparissias). The combination of this white cistus with the Mauritanian bindweed Convolvulus sabatius is sensational.
The rock rose is a pioneer plant, linked to fire ecology. In nature, seed germination is subject to the intense and brief heat associated with fires. These shrubs quickly colonize devastated surfaces, allowing other plants to settle in the shelter of their branches. With a relatively short lifespan of 10 to 15 years, cistus plants then make way for larger shrubs that deprive them of sunlight.
Halimiocistus sahucii in pictures
Plant habit
Flowering
Foliage
Botanical data
(x) Halimiocistus
sahucii
Cistaceae
sahuc rock rose
Cultivar or hybrid
Planting and care
Sahuc's rock rose requires full sun (or at most partial shade in Mediterranean areas) and a perfectly drained, rocky or sandy, poor soil, whether it be acidic, neutral or even slightly chalky. This shrub is drought-resistant when well-established. Water abundantly during the first summer after planting, but spaced it out (11 litres of water per week). Afterwards, it will rely on rainwater, even in very dry regions. Under these conditions, it is hardy down to -7°C (19.4 °F) once mature and will live longer. Mulch it in winter in slightly colder regions and protect it from wind and cold as much as possible. Place it in the warmest corner of the garden, in full sun against a south-facing wall, in a rocky or sandy slope or any substrate that does not retain moisture, which would be fatal to it in winter or summer, which is its vegetative rest period. The combination of heat and humidity leads to the development of a fungus that attacks the plant's collar and would be fatal to it as much as a Siberian cold. You can lightly prune the stems after flowering to encourage the plant to branch out. Avoid severe pruning.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.