Cosmos bipinnatus Sensation - Garden Cosmos
Cosmos bipinnatus Sensation - Garden Cosmos
Cosmos x bipinnatus Sensation
Garden Cosmos, Mexican Aster
Given the number of seeds and the few cosmos that actually sprouted, I can only be disappointed. I followed the sowing dates precisely, though.
Mat, 14/10/2025
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Description
Cosmos Sensation with large flowers are annual plants with a tall habit, 100 to 110 cm (39 to 43in) in height, primarily used for flowering in rustic-style flower beds. Their large 9 cm (4in) diameter flowers are supported by elegant stems emerging from finely cut foliage. Even the slightest breeze causes these flowers to sway in a graceful multicoloured wave. The elegance of this abundant flowering does not go unnoticed. The colours of this Cosmos bipinnatus Sensation mix are numerous: red, pink, rose, white, violet.
The long and abundant flowering period, which extends from June to October, is also a significant advantage of Cosmos bipinnatus Sensation .
Cosmos bipinnate easily pairs with large plants in a rustic style, such as Gauras, Echinaceas, Crocosmias, and grasses.
Very easy to grow, Cosmos is a plant that beginners can sow. Cosmos is tolerant to summer drought.
The aesthetic qualities of its flowers, its finely cut and airy light green foliage, as well as its excellent vase life make it a preferred flower for creating summer bouquets.
An ecological note: Sowing a melliferous plant like Cosmos in your garden will attract pollinating insects and butterflies throughout the summer. At the end of the season, let the last flowers produce their seeds, which are particularly appreciated by birds. This will encourage them to settle in your garden and play an important role in its ecosystem.
Flowering
Foliage
Plant habit
Botanical data
Cosmos
x bipinnatus
Sensation
Asteraceae
Garden Cosmos, Mexican Aster
Cultivar or hybrid
Planting and care
Two cultivation options are available to you: 1. Sowing under glass in March-April, followed by transplanting into pots before final placement in your flower beds after the frost. 2. Direct sowing in May (after the last frost), followed by transplanting at a distance of 30 cm (12in) or simply thinning out excess seedlings. It takes between 80 and 90 days from sowing to flowering. During the summer months, removing faded flowers will promote renewal and prolong flowering until autumn.
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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