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Cornflower Red Boy Seeds - Centaurea cyanus

Centaurea cyanus Red Boy
Cornflower, Bachelor's button, Bluebottle, Cyani Flower, Barbeau, Blaver, Blue Bonnet, Happy Skies, Ragged Robin

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This adorable annual weed, once so common in the countryside, surpasses itself in this very beautiful variety that bears double flowers in a very rich shade of pinkish carmine red. Very decorative in large drifts, these cornflowers bloom for months on end, if care is taken to remove the flowers as they wilt. They like full sun and fertile, well-drained soil.
Flower size
3 cm
Height at maturity
90 cm
Exposure
Sun
Annual / Perennial
Annual
Germination time (days)
18 days
Sowing method
Direct sowing, Sowing under cover with heat
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Sowing period February to April, August to September
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Flowering time June to August
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Description

Centaurea cyanus Red Boy is a very beautiful variety derived from the wild, annual cornflower, also called bachelor's button. Its flowers are full double blooms and are of very richly nuanced shades of red, tinged with carmine pink. Just like the adorable annual weed which was once so widespread in the countryside, wandering even as far as into our cereal crop fields, they paint a somewhat naïve but unforgettable picture. Very decorative in large drifts, these cornflowers are perfect in wildflower bouquets and bloom for months on end if care is taken to remove the flowers as they wilt.

 

Cornflowers of the 'Red Boy' variety belong to the Asteraceae family. It is a cultivar derived from Centaurea cyanus, an annual herbaceous plant native to Europe and North Asia that has long been considered an invasive weed in cereal crops and is one of the most beautiful wildflowers of our regions. It forms an upright clump with tender stems, reaching 80-90 cm (2 ft 8-3 ft) high and 25 cm (10 in) wide, that bear very narrow, long, greyish-green leaves. The flowering period lasts from June to August, displaying inflorescences in the form of double flower heads of 3 cm (1.2 in) in diameter. The ligulate flowers (or the petals surrounding the centre) are indented at their tips and come in a hue ranging carmine to magenta, while the centre of the inflorescence is made up of florets of a darker red. The blooms are very melliferous and nectar-rich. The fruit is an achene that contains seeds that easily self-sow in light soil. The seedlings produced from spontaneous self-sowing will not necessarily be identical to the parent plants.

  

Cornflowers are enchanting in flowerbeds where they form remarkable patches of colour. The variety 'Red Boy', a delightful descendant of the most famous of them all, brings the charm of the countryside to our gardens. Sow cornflower in wild-looking beds, combined with ornamental grasses such as Stipa tenuifolia or Muhlenbeckia capillaris. Add to the mix its brother 'Blue Boy', alongside common poppies, blue or white  love-in-a-mist, annual or oriental poppies, tall daisies, thistles (Eryngium, Echinops), or chamomile. The edible flowers can be used to decorate summer salads. It is also an excellent cut flower.

Flowering

Flower colour red
Flowering time June to August
Inflorescence Flower head
Flower size 3 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour green

Plant habit

Height at maturity 90 cm
Spread at maturity 25 cm
Growth rate very fast

Botanical data

Genus

Centaurea

Species

cyanus

Cultivar

Red Boy

Family

Asteraceae

Other common names

Cornflower, Bachelor's button, Bluebottle, Cyani Flower, Barbeau, Blaver, Blue Bonnet, Happy Skies, Ragged Robin

Origin

Cultivar or hybrid

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Planting and care

Sow cornflower 'Red Boy' seeds outdoors, in their final position, in March-April. Choose a sunny spot with well-drained soil that has been well prepared and raked to a fine tilth. Sow thinly, to a depth of 3 mm (0.2 in), spacing the seeds 30 cm (1 ft) apart. Water regularly, especially during dry periods. Germination usually takes 14-21 days. When the cornflower seedlings are large enough to handle, transplant them 50 cm apart.

An alternative is to sow them indoors from August to September to obtain blooms at the beginning of the following summer. Sow the cornflowers on the surface of good quality soil at a temperature of 18-23 °C, and cover with a sprinkling of very fine garden compost or vermiculite. Keep the seedlings in the light as this helps germination. When the seedlings are large enough to be moved, transfer and grow them in a sheltered location from the cold until the seedlings are large enough to be moved outdoors. Grow the cornflower seedlings in a frost-free place before planting out the following spring, or prick them out into pots. Cornflowers thrive in fertile, well-drained, fine tilth soil, in full sun.

Sowing period

Sowing period February to April, August to September
Sowing method Direct sowing, Sowing under cover with heat
Germination time (days) 18 days

Intended location

Suitable for Meadow, Rockery
Type of use Border, Slope
Ease of cultivation Beginner
Exposure Sun
Soil pH Any
Soil moisture Moist soil, Well-drained, rich soil

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