Aster laevis Calliope
Aster laevis Calliope
Aster laevis Calliope
Aster laevis Calliope
Aster laevis Calliope
Smooth Aster, Smooth Blue Aster
Major issue with the first delivery, plants completely damaged due to faulty logistics. Fully replaced by Promesse de Fleurs, excellent customer service, second delivery still had some packaging problems. In the ground for 2 weeks, 5 with encouraging shoots, 1 apparently weak. Fragile plants for shipping, we'll see the result in September...
pascal, 05/06/2025
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This plant carries a 12 months recovery warranty
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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
Aster laevis Calliope, also known as Smooth Aster or Giant Fall Aster, is a massive aster of great ornamental value, both original and precious. This variety is distinguished by its black stems and purple foliage. It offers abundant and prolonged flowering in autumn, like a cloud of small blue-mauve stars with a golden heart that turns crimson. This large, very hardy and robust perennial requires full sun to flourish and adapts to all soils that are not too heavy, and even occasionally dry. It is a plant with a wild appearance, robust but very refined, truly superb in the back of a border.
Aster laevis Calliope belongs to the Asteraceae family. Aster laevis, from which it originates, is native to North America, specifically Florida. This perennial shows an upright and bushy tufted habit from spring onwards. It will reach a minimum height of 130 cm (51in) when in flower and will spread to 70 cm (28in), with very rapid growth. The airy and generous flowering, which bees and butterflies love, lasts from August to October. The light blue-mauve flower heads measure 4 cm (2in) in diameter. The heart is bright yellow and quickly takes on a wine-like hue. The stems are strong, branching, and black. The foliage is purple with bluish highlights and a wine-red line in the centre. The basal leaves are lanceolate and dentate, while the stem leaves are clasping. This plant spreads rapidly via rhizomes.
It is impossible to imagine our gardens without asters in the beds or borders. This one is particularly ornamental. It pairs very well with intense magenta Salvia microphylla, 'Lemon Queen' Sunflowers, and large Rudbeckias, for example. The aster genus is extremely diverse, coming in a wide range of varied colours and sizes. Try combining pink and blue asters with the 'Grace' Cotinus or dwarf winged Euonymus: the colour combination is astounding. These plants also make excellent cut flowers. Depending on the cultivars, it is possible to extend the flowering period right from spring to the end of autumn, allowing gardening enthusiasts to enjoy these lovely daisy-like flowers for a large part of the year.
Aster laevis Calliope in pictures
Flowering
Foliage
Plant habit
Botanical data
Aster
laevis
Calliope
Asteraceae
Smooth Aster, Smooth Blue Aster
Cultivar or hybrid
Planting and care
Plant Aster laevis Calliope in autumn or spring in a soil that is not too acidic or too alkaline, light, well-worked, sandy or loamy, moist to occasionally dry, not too poor. A heavy and wet soil shortens its lifespan. It appreciates full sun. It may be necessary to stake the plant depending on its growth (a rich soil will produce a lush but less sturdy plant). Avoid strong winds that would flatten the clumps. Once established, avoid moving it as it does not tolerate change well. In a border, leave at least 80 cm (32in) spacing around the plant. Divide clumps every three or four years to keep them floriferous. This aster may be susceptible to powdery mildew if planted in a soil that is too dry and too poor.
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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