Heliopsis helianthoides Mars
Heliopsis helianthoides Mars
Heliopsis helianthoides Mars
Oxeye sunflower, False sunflower, Smooth oxeye, Rough oxeye
Received with three buds cut during packaging, the recovery was difficult. Today it is in flower and, although a bit frail, has found its place in a flower bed where it cheerfully brightens up with its yellow flowers. The big plus: the flowers last very long—none have wilted since the beginning of flowering. I highly recommend it, I'm a fan!
didier, 03/08/2025
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Description
Heliopsis helianthoides 'Mars' warms up dull autumn days with its semi-double suns with orange hearts. The bright and golden inflorescences rise to the top of tall, strong and rigid stems. It is a beautiful perennial closely related to Helianthus, the famous sunflower, to which it bears a strong resemblance. It is an undemanding plant, suitable for well-drained soil, in full sun or partial shade. Its great vigour and simplicity make it suitable for the back of borders and rustic compositions.
Heliopsis belongs to the Asteraceae family. H. helianthoides, from which the 'Mars' variety originates, is native to North America, where it is usually found in open woodland areas and tall grass prairies. 'Mars' is a non-running woody perennial. It forms a spreading bushy clump, composed of numerous sturdy stems, reaching 1.5 metres (5 feet) in height and occupying 60cm (24in) of ground space. Its growth is moderate to fast. It blooms from June to September. The inflorescence appears at the end of branched stems, composed of several heads (heads). The heads form a beautiful rounded central disk that turns orange and then brown in autumn, surrounded by a double crown of ligulate yellow flowers. The deciduous foliage extends to the top of the stems, it is bright green and rough, the leaves are lanceolate and dentate, about 10cm (4in) long and somewhat triangular.
Fashion trends can be quite inscrutable 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! However, all specialists agree that they are excellent plants. 25 years ago, Alan Bloom, a famous perennial plant breeder in England, said: "They are certainly the last plants I would part with if I decided to eliminate the yellow colour from the borders of my garden." Combine Heliopsis 'Mars' with other tall, easy and vigorous perennials such as mulleins, giant scabious or Verbena bonarienses, for example, in rustic borders. It is a very good plant for quickly filling the back of a border.
Heliopsis helianthoides Mars in pictures
Flowering
Foliage
Plant habit
Botanical data
Heliopsis
helianthoides
Mars
Asteraceae
Oxeye sunflower, False sunflower, Smooth oxeye, Rough oxeye
Cultivar or hybrid
Planting and care
The false sunflower is an easy-to-grow plant. It adapts to any well-drained soil and only fears excessive winter moisture and slightly dry soil in summer. However, it tolerates clayey, poor, and occasionally dry soils. Heliopsis helianthoïdes 'Mars' prefers a sunny exposure, but it tolerates partial shade, which will give it a looser habit, in which case it will require light staking. It should be protected from strong winds. It is advisable to deadhead the flowers to encourage reblooming. The plant can be divided every 2 to 3 years to maintain its vigour. You can also cut the plant back by half in early June to promote the strength of the clump. Note that some varieties of Heliopsis are susceptible to powdery mildew and rust when growing conditions are not optimal. A preventive treatment against fungal diseases should be carried out towards the end of winter. Afterwards, treatment should only be applied if necessary, in case of confirmed presence of parasites on the plant, using targeted treatments whenever possible. In any case, treatment should be avoided during flowering to avoid harming pollinating insects.
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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