Eupatorium coelestinum
Eupatorium coelestinum
Eupatorium coelestinum
Eupatorium coelestinum
Eupatorium coelestinum
Eupatorium coelestinum
Eupatorium coelestinum
Eupatorium coelestinum
Eupatorium coelestinum
Eupatorium coelestinum
Hardy Ageratum, Mist flower
Plant arrived weak, has died
Anouck, 10/08/2025
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Description
Eupatorium coelestinum is a sturdy and tall herbaceous plant with pastel blue to lilac umbel-like flower heads.
It is a herbaceous perennial from the Asteraceae family, also known as Ageratum. Native to North America, it has beautiful deciduous foliage in a deep green colour that turns lime-green during flowering. The leaves are oblanceolate. The plant bears its terminal flower heads in umbel-like clusters on sturdy wine-coloured stems, reaching a height of 80 cm (32in); giving it an upright and bushy habit. It commonly reaches a width of 60 cm (24in). The inflorescences can reach a diameter of 10 cm (4in), resembling bluish pompons with a slightly blurred appearance. It is true that the flowering period is a bit late, but it can embellish a garden throughout the summer until the end of October. It maintains its decorative aspect during winter thanks to its fruiting topped with small fluffy seed heads that disperse with the wind.
Eupatorium coelestinum is an easy-to-grow plant: it is resistant to insects and diseases. It is an extraordinary melliferous plant, attracting pollinators, especially butterflies. It is hardy and can withstand temperatures as low as -15°C (5°F). It is also a plant called an indicator species: in its natural state, it prefers to grow on fresh to moist soils, indicating a certain degree of soil moisture. You can plant it alongside a pond. It adapts to all types of soils, but it prefers moist, rich, and well-drained soils. They will look stunning in a wild garden as a groundcover on the edge of a flower bed, accompanied in the background by their larger relatives, Eupatorium cannabinum Plenum with double flowers. Prune the stems to maintain a more compact habit.
Eupatorium gets its name from the Persian emperor Mithridates Eupator, who boasted of surviving poison ingestion thanks to a powerful antidote. However, the knowledge of that time does not allow us to say with certainty whether the antidote in question was truly Eupatorium or Agrimony, two plants with strong similarities.
Eupatorium coelestinum in pictures
Flowering
Foliage
Plant habit
Botanical data
Eupatorium
coelestinum
Asteraceae
Hardy Ageratum, Mist flower
Central Europe
Planting and care
This is a plant called an indicator plant: in its natural state, it tends to thrive on damp or even moist terrain. It indicates a certain level of soil moisture. It adapts to all types of soil, but it definitely prefers them to be moist, rich, and well-drained.
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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