Heliopsis helianthoides var. scabra Sommersonne
Heliopsis helianthoides var. scabra Sommersonne
Heliopsis helianthoides var. scabra Summer Sun
Oxeye sunflower, False sunflower, Smooth oxeye, Rough oxeye
I bought 2 young plants for trials and for bouquets. I received the plants in good health in buckets. Currently, they are protected by 5l bottles as they are being attacked either by slugs or by birds, or both. They are slowly recovering away from predators. I hope to be able to make beautiful bouquets out of them.
Béatrice, 25/05/2024
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Description
The flowers of Heliopsis helianthoides 'Sommersonne', also known as 'Summer Sun', are bright and golden, they will illuminate the dull days of autumn with their double suns. They rise high on tall, strong, and rigid stems. This beautiful perennial is both similar in appearance and closely related to the famous sunflower, Helianthus. It is an undemanding plant, suitable for any well-drained soil, in full sun or partial shade. Its great vigour and simplicity make it suitable for the back of borders and naturalistic compositions.
Heliopsis helianthoides var. scabra 'Sommersonne' belongs to the Asteraceae family. Heliopsis helianthoides var. scabra, from which it originates, is native to North America, where it is generally found in open woodlands and tall grass prairies, less commonly along roadsides.
The cultivar 'Sommersonne' is a perennial plant with a non-spreading woody stump. It forms a spreading bushy clump, made up of numerous sturdy stems, reaching a height of up to 90cm (35in) and spreading 60cm (24in) wide. Its growth rate is moderate to fast. Flowering occurs from June to September. The inflorescence appears at the end of branched stems and consists of several heads (capitules), themselves made up of double, bright yellow ligulate flowers (the 'petals') and brownish florets forming the disk. The deciduous foliage extends to the top of the stems, it is bright green and rough, with lanceolate and dentate leaves, slightly triangular.
Trends are quite puzzling because the upright habit of these perennials, their long flowering period, and their low requirements are all keys that should open the door to every garden... but no! Yet, all specialists agree that they are excellent perennial plants. 25 years ago, Alan Bloom, a famous perennial plant breeder in England, said: "These are certainly the last plants I would get rid of if I decided to eliminate the yellow colour from the borders in my garden." Combine Heliopsis Summer Sun with other tall, easy-going perennials such as hybrid mulleins, Buenos Aires verbena, tansies, sneezeworts, and Franchet's ground cherry.
Heliopsis helianthoides var. scabra Sommersonne in pictures
Flowering
Foliage
Plant habit
Botanical data
Heliopsis
helianthoides var. scabra
Summer Sun
Asteraceae
Oxeye sunflower, False sunflower, Smooth oxeye, Rough oxeye
Cultivar or hybrid
Planting and care
Heliopsis are easy to grow plants. They adapt to any well-drained soil and only fear excessive winter moisture and excessively dry soil in summer. However, they tolerate clayey, poor, and occasionally dry soils. Heliopsis helianthoides 'Sommersonne' prefers a sunny exposure, but it tolerates partial shade, which will give it a slightly looser habit and will require some light staking. It should be protected from strong winds. It is preferable to remove faded flowers to promote reblooming. The plant can be divided every 2 to 3 years to maintain its vigour. You can also cut back the plant by half in early June to promote the strength of the clump. Note that certain varieties of Heliopsis are susceptible to powdery mildew and rust when growing conditions are not optimal.
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).
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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