Helianthemum Mixture - Rock Rose
Helianthemum Mixture - Rock Rose
Helianthemum Mix
Rock Rose
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
With their small cistus-like appearance, the Helianthemums of this mix bear adorable rose, lemon, copper, red, purple, and white flowers from May to July, depending on the plants. These evergreen undershrubs are very floriferous and form delightful ground covers. Their evergreen foliage, ranging from green to grey-green-silver, provides a beautiful backdrop to their flowering. They thrive in sunny borders and rockeries, cascading over a low wall or between the stones of a pathway.
Belonging to the Cistaceae family, the helianthemums in this lovely collection come from two botanical species, Helianthemum apenninum, native to southern Europe, and H. mummularium, widespread in Europe and Turkey. Like their ancestors, they love calcareous, rocky, and sandy soils, as well as full sun. Without these conditions, they do not flower and will wither. Helianthemum forms a low, spreading, cushion-like, dense undershrub, 25cm (10in) tall and 30 to 35cm (12 to 14in) wide. Its foliage is evergreen to semi-evergreen, depending on the climate. It is composed of small linear leaves that differ in appearance depending on the plants in the mix we offer. Their colour ranges from dark green to silver-grey. It highlights an abundant and bright flowering in various colours, either solid or bicoloured. From May to August, it is covered with a multitude of small cup-shaped flowers, 3cm (1in) in diameter, with five crumpled petals adorned with a bouquet of golden stamens.
Helianthemum is the ideal plant to enhance a rocky garden, a sunny embankment, in the stones of a pathway, or cascading over a wall. It also looks stunning at the front of perennial beds or raised flower beds. It is suitable for cultivation in pots or containers on patios. It can be used to create green walls and green roofs. It can be associated with other rockery plants (erigeron, shrubby potentilla, shrubby wallflower), as well as perennial plants such as lavender, Iris germanica, cistus, helenium, Convolvulus cneorum and C. sabatius, coreopsis, creeping thyme, and rosemary. Its flowers blend delicately with the grey foliage of stachys, dwarf artemisia, and silver basket (cineraria).
Flowering
Foliage
Plant habit
Botanical data
Helianthemum
Mix
Cistaceae
Rock Rose
Cultivar or hybrid
Planting and care
Sow the helianthemum seeds from March to June.
Sow the seeds in trays, pots, etc. in moist but well-drained special sowing compost. Barely cover the seeds with compost. Enclose the sown seeds in a transparent plastic bag and keep in a warm place to maintain an optimal temperature of 21 to 24°C (69.8 to 75.2°F). Germination can take 15 to 20 days.
Transplant the young plants once they are large enough to handle, into 8cm (3in) pots. Let them grow under a cold frame and plant them outdoors in full sun, spacing them 30 to 45cm (12 to 18in) apart.
Cultivation:
Helianthemum enjoys being planted in full sun, in neutral or limestone, well-drained soil, even dry in summer, that is rich in gravel or sand. It does not tolerate stagnant moisture in winter. In cold and humid climates, lighten the soil during planting by adding gravel and sand to improve drainage. Helianthemum is a very hardy plant that can withstand temperatures between -15 to -20°C (5 to -4°F). It tolerates drought well and only requires regular and moderate watering during its first year after planting; afterwards, the plant can manage on its own. At the end of flowering, pinch off the faded flower spikes and foliage to encourage autumn regrowth. Lightly prune the clump with hedge shears after flowering to maintain a dense vegetation and prevent the centre from becoming bare. When young, make sure to protect it from weeds that retain moisture and shield it from harsh sunlight.
Sowing period
Intended location
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).
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.
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