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Centaurea cyanus Snowman - Cornflower seeds

Centaurea cyanus Snowman
Cornflower, Bachelor's button, Bluebottle, Boutonniere flower, Hurtsickle, Cyani flower

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A very beautiful variety of annual cornflower with large double, snowy white flowers. Very decorative in large clumps and sublime in a vase, the plants bloom for 3 or 4 months if you regularly remove faded flowers. They should be grown in full sun, in fertile and well-drained soil, which remains slightly moist in summer. Sow in spring or autumn, directly in the open ground.
Flower size
3 cm
Height at maturity
60 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 'Snowman' is a beautiful double, white selection of an annual field plant called Cornflower or Blue Cornflower. Its flowers are large and full of petals, resembling snowy pom-poms from early summer to early autumn if you regularly deadhead. Highly decorative in large clumps in flower beds, these flowers are perfect in rustic or romantic bouquets.

The annual cornflowers of the 'Snowman' variety belong to the Asteraceae family. Their ancestor, Centaurea cyanus, is an annual herbaceous plant native to Europe and Northern Asia, long considered an invasive weed in cereal crops. It is also one of the most beautiful wildflowers. Each plant forms an upright clump of weak stems, 60-65 cm (24-26in) tall, bearing very narrow and long, greenish-grey leaves. It blooms from June to September, earlier or later depending on the sowing date. The inflorescences, which we call the flowers, are double, 3 cm (1in) diameter heads. The Ligules (or petals of the crown) are pure white, toothed at their tips. The centre of the inflorescence is composed of shorter, pale beige florets. The fruit is an achene that contains seeds easily reseeding in light soil. Plants obtained from self-seeding may not necessarily be identical to the parent.

Annual cornflowers create remarkable spots of colour in flower beds and borders. Centaurea cyanus 'Snowman', a delightful descendant of the most famous among them, brings the charm of the countryside and the purity of its white flowering to our gardens. It will be sublime in wilder flower beds with medium-sized grasses like Stipa tenuifolia or Muhlenbergia capillaris. Also, grow it with poppies, Love-in-a-Mist, large daisies, thistles (Eryngium, Echinops), or chamomiles. The edible flowers can be used to decorate summer salads. It is also an excellent cut flower.

Flowering

Flower colour white
Flowering time June to August
Inflorescence Flower head
Flower size 3 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour green

Plant habit

Height at maturity 60 cm
Spread at maturity 25 cm
Growth rate very fast

Botanical data

Genus

Centaurea

Species

cyanus

Cultivar

Snowman

Family

Asteraceae

Other common names

Cornflower, Bachelor's button, Bluebottle, Boutonniere flower, Hurtsickle, Cyani flower

Origin

Cultivar or hybrid

Planting and care

Sow the seeds of annual Snowman cornflower outdoors, directly in place, in March-April or September. Choose a sunny location with well-drained soil, properly prepared and loosened. Sow the seeds finely, at a depth of 3 mm (0in), with a spacing of 30 cm (12in). Water regularly, especially during dry periods. Germination usually takes 14 to 21 days. When the cornflower plants are large enough to handle, transplant them 15 cm (6in) apart.

Another option is to sow indoors from August to September for earlier flowering the following year. Sow the cornflowers on the surface of good quality compost at a temperature of 18-23°C (64.4-73.4°F), and cover with a pinch of very fine compost or vermiculite. Keep the sowing in light, as this facilitates germination. When the seedlings are large enough to handle, transplant and grow them on in a frost-free location until the young plants are large enough to be moved outdoors. You can grow these cornflower plants in a frost-free area before planting them in the ground in the following spring, or in pots.

Annual centaurias thrive in fertile, well-drained, well-loosened soil that does not dry out too much and 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
Type of use Border, Container
Ease of cultivation Beginner
Exposure Sun
Soil pH Any
Soil moisture Moist soil, fertile, well-drained

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