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Centaurea atropurpurea

Centaurea atropurpurea
Dark purple knapweed

5,0/5
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Beautiful naked young plant, that's true, but perennial? At my place, they lasted at most two consecutive years and then disappeared. I think they're more like biennials.

Sophie, 05/06/2022

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This plant carries a 12 months recovery warranty

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Value-for-money
This knapweed is a cousin of the cornflower. In summer, this tall perennial displays deep red-purple thistle-like flowers, emerging from finely cut silvery foliage. It is a hardy perennial, native to Bohemia. It combines the robustness of wild plants with a particularly elegant chromatic marriage. This greedy and generous plant loves sunlight. It is perfect in natural, slightly wild flower beds.
Flower size
3 cm
Height at maturity
60 cm
Spread at maturity
30 cm
Exposure
Sun
Hardiness
Hardy down to -29°C
Soil moisture
Dry soil, Moist soil
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Best planting time March to April, September to October
Recommended planting time February to April, September to November
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Flowering time May to July
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Description

Centaurea atropurpurea, also known as Purple Centaury, is a cousin of the cornflower. In summer, this tall plant displays red-purple thistle-like flowers, emerging from finely cut silver foliage. Still little-known, it is a hardy perennial, native to Bohemia. It combines the robustness of wild plants with a particularly elegant chromatic marriage. Sun-loving, greedy and generous, this baroque plant will succeed in natural, slightly wild borders.

 

Centaurea atropurpurea belongs to the Asteraceae family. It is native to the Balkans where it grows in mountainous Carpathian meadows. This perennial forms an upright tuft, with a bushy and spreading habit, reaching a minimum height of 60cm (24in), with a spread of 30cm (12in). Flowering takes place from May to July, in the form of purple-red thistle-like flowers, with small petals emerging from a decorative ovoid calyx. These solitary flowers are borne at the end of large sturdy stems, and are covered with grey felting. The deciduous foliage is arranged in a rosette. It is also pubescent. The foliage is strongly cut, with a grey-silver appearance that is even more pronounced in hot and dry weather.

 

The purple centaury will naturally find its place in borders or on sloping banks, in the company of perennials that will enhance its baroque and refined beauty, such as the silver foliage of Artemisia 'Canescens', Artemisia alba, or the small azure blue flowers of perennial flax, pink coreopsis, and the blonde hair of Stipa tenuifolia.

 

 

Centaurea atropurpurea in pictures

Centaurea atropurpurea (Flowering) Flowering
Centaurea atropurpurea (Foliage) Foliage

Flowering

Flower colour red
Flowering time May to July
Inflorescence Solitary
Flower size 3 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour grey or silver

Plant habit

Height at maturity 60 cm
Spread at maturity 30 cm
Growth rate slow

Botanical data

Genus

Centaurea

Species

atropurpurea

Family

Asteraceae

Other common names

Dark purple knapweed

Origin

Eastern Europe

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Planting and care

Plant in autumn or spring, in ordinary, deep, well-worked, well-drained soil. This plant dreads stagnant moisture in winter. It withstands temporary drought, but it grows better and flowers for longer in moist soil. Give it a sunny exposure, or partial shade during the hottest hours; it doesn't ask for more to settle well in the garden. Cut back the dried stems before winter.

Planting period

Best planting time March to April, September to October
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow, Rockery
Type of use Border, Slope
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Planting density 3 per m2
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, well-draining, fertile

Care

Pruning No pruning necessary
Disease resistance Very good
Overwinter Can be left in the ground
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