Aster ageratoides Harry Schmidt
Aster ageratoides Harry Schmidt
Aster ageratoides Harry Schmidt
Japanese Aster, White Michaelmas Daisy, Asian Starwort
The plants are very green and vigorous, although pruned very short, which is not a bad thing for transport given the heat this August. Planted as soon as received, they seem ready to grow back. I'm looking forward to the flowering next year.
Christelle, 27/08/2025
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Description
Low-maintenance and resistant to powdery mildew, Aster ageratoides Harry Schmidt is an excellent perennial that will find its place in all gardens. This dwarf variety is very compact and transforms into a true cushion of pale lilac star-shaped flowers with a small amber centre for 2 months starting from the end of summer. Its dense and regular silhouette and abundant flowering will bring a very neat touch to the beds of heavier perennials. This very hardy aster appreciates sunny locations and well-drained but moist soil.
Aster ageratoides is a perennial plant native to northern Myanmar, southwestern China, and Tibet. It belongs to the Asteraceae family. The 'Harry Schmidt' variety stands out for its small size and very compact habit. This plant forms a regular and suckering stump with upright, rigid, and close-growing stems, bearing deciduous foliage that is slightly rough and matte-green. The mature plant will form a bushy and round clump, reaching a height of 40 cm (16 in) and a diameter of 30 cm (12 in). In early autumn, starting from September, numerous small flowers with very fine ligulate petals appear, in a pretty pastel-lilac shade that makes the foliage disappear.
Plant Aster ageratoides Harry Schmidt in any type of soil; it even tolerates poor-quality soil such as backfill soil or compact and clayey soils, with its only requirement being not to compete with other perennials with a strong root system. In the garden, for example, associate it with perennial geraniums or light grasses such as Stipa tenuifolia or Muhlenbergia capillaris. It also forms beautiful bluish-pink flows between large rocks in a rockery. Its abundant and delicate flowering attracts pollinating insects. The flowering stems are very attractive in a vase in a floral arrangement, along with September roses.
The Aster genus offers a large number of species, represented by a multitude of floriferous varieties. They come in all sizes, in an extremely rich range of colours. Several species are associated with each season.
Aster ageratoides Harry Schmidt in pictures
Flowering
Foliage
Plant habit
Botanical data
Aster
ageratoides
Harry Schmidt
Asteraceae
Japanese Aster, White Michaelmas Daisy, Asian Starwort
Cultivar or hybrid
Planting and care
Install Aster ageratoides Harry Schmidt in any soil; it even accepts poor-quality soil such as backfill soil, or compact and clayey soils. But while it adapts to lean and relatively dry soils, it will require fertilisation in April, more frequent watering in summer, and mulching to maintain freshness at its base. In mass plantings, leave at least 50 cm (20 in) spacing between plants. At the end of flowering, cut back the clump to 10 cm (4 in). Divide clumps every 2 to 3 years to maintain vigorous roots and propagate this wonderful plant throughout the garden.
Plant it in a sunny location that allows it to express its full potential. Its robust foliage appears to be very resistant to powdery mildew, even in hot weather. Its only requirement is not to compete with other perennials with a strong root system. Prune dry branches in winter.
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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