Centaurea montana Seeds
Centaurea montana Seeds
Centaurea montana
Perennial Cornflower, Great Blue-bottle, Mountain Bluet, Mountain Centaury
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Description
Centaurea montana, the mountain cornflower, is a hardy perennial whose countryside flower is well known. Its beautiful inflorescences are composed of magnificent fine and toothed deep blue ligules, surrounding a pretty purple heart. They are renewed from the middle of spring to the middle of summer and are enjoyed by both pollinators and bouquet enthusiasts. Accustomed to mountain, countryside, or wild gardens, it can also be found in contemporary gardens, as its refined appearance can suit this setting. Preferring moist, fertile soils and sunny exposures, it also tolerates poor, limestone soils and moderate periods of drought.
Centaurea montana is found in the wild in a large part of southern and central Europe. This herbaceous perennial with rhizomatous roots grows spontaneously in meadows, in massifs, and in rockier terrains at altitude. It tends to spread by forming new tufts at the periphery. It can become carpeting after a few years. Its deciduous foliage has a beautiful silver-green colour. It is slightly velvety (especially on the lower side). The sessile leaves are lanceolate and positioned alternately along the stem. The plant thus forms a beautiful upright tuft 50cm (20in) high and 30cm (12in) wide. The stems are often single and crowned with an involucre made up of a collection of bracts. To put it simply, it looks like a tiny green artichoke, still in bud, with black ciliated scales. From May (depending on the climate and exposure), beautiful inflorescences emerge, which renew generously until August. The periphery is formed by long, tapered and cut ligulate flowers. Deep blue, they surround the tubular flowers in the centre, which are small and of intense violet. This particularly delicate and subtle ensemble offers enchanting colours in flower beds or bouquets.
Being both a companion of wild and romantic gardens, the mountain cornflower is also a choice guest in more contemporary compositions. Its airy flowers, with dense colours and subtle patterns, are incredibly fashionable and blend well with many grasses. It is perfect in borders, blue compositions, and all flower beds, thanks to its versatile size. With its vibrant and remarkable colour, this centaurea pairs well with catmints, globe thistles, and godetias.
Centaurea montana Seeds in pictures
Flowering
Foliage
Plant habit
Botanical data
Centaurea
montana
Asteraceae
Perennial Cornflower, Great Blue-bottle, Mountain Bluet, Mountain Centaury
Central Europe
Planting and care
Sowing:
Sow from January to March or from September to November. Sow on the surface of light, moist but well-draining special sowing compost, then lightly cover the seeds with fine quality vermiculite. Place the container in a heated mini-greenhouse, or enclose the sowing in a polythene bag in a location maintained at 15 to 20°C (59 to 68°F). Germination can take 1 to 3 months. Keep the sowing near a source of light, as this facilitates germination.
When they are large enough to be handled, transplant the young plants into 8cm (3in) trays or pots. Gradually acclimatise them to cooler conditions for a few weeks before planting them out, after all risk of frost has passed, with a spacing of 45 to 60cm (18 to 24in).
Sowing in situ is also possible, between April and June. Prepare the soil by weeding it and sow in well-prepared soil free of surface stones using a rake. After sowing, lightly firm the soil. For a meadow of flowers, mix the centaureas with other seeds.
Cultivation:
Centaurea montana thrives in ordinary, light, even poor, but well-drained soil, as well as full sun. This plant likes moderately moist to moderately dry soil, but dislikes winter humidity. It is very adaptable and tolerates short periods of drought and city pollution quite well. Removing faded inflorescences will encourage the renewal of flowers. This robust and hardy plant will grow in most types of soil, in all regions. The plants can be severely cut back in summer to maintain a compact habit.
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).
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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.