Blue Boy
Blue BoyBlue BoyHow to Grow Centurea cornflowers seeds

Blue Boy

5 out of 5 based on 1 customer rating
(1 customer review)


  • Annual
  • Edible flowers
  • Tall growing for cut flowers.
  • Bright blue on fuzzy grey stems
  • Plant height 90cm (36″)

Product Description

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Centaurea cyanus. Centaurea are also known as Bachelor’s Buttons. These familiar, charming, brightly-coloured pompoms on fuzzy grey stems, are well loved by humans and attractive to beneficial hover-flies. Blue Boy is at home in borders, with herbs, or in the kitchen garden. Direct sow Blue Boy cornflower seeds at repeated intervals in April to June to extend bloom. Centaurea can also be planted in October on the Coast. Blue Boy has the traditional vivid blue blossoms, tall growing for masses of cut flowers. Centaurea flowers also dry particularly well. Tear fresh flower petals for use in salads, teas, or fancy drinks. Plant height 90cm (36″). It is drought tolerant once established, so good for xeriscaping.


How to Grow Centaurea

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An annual plant that also answers to Cornflower, Bachelor’s Button, Bluebottle, Hurtsickle, Hardheads, Knapweed, and Star Thistle. We use the genus name to keep it nice and simple. Grows well in any ordinary, well drained garden soil.  Seeds will flourish within the pH range of 5.5-7.0. Deadhead regularly to prolong blooming. You will find planting several times over the spring will produce a longer bloom time throughout summer and early fall.

Centaurea cyanus
Family: Asteraceae


Season & Zone
Exposure: Full sun
Zone: 1-10

Direct sow starting just before last frost, and again every two weeks until end of May. Can be direct sown in autumn as well. Starting indoors is not necessary, but can be accomplished by keeping seed trays in the dark at the optimal soil temperature of 15-21°C (60-70°F). Move under bright lights once germination occurs, and transplant out in late spring, around mid-May.

Just cover the small seeds. Thin or space to 15-30cm (6-12″) apart.


1 review for Blue Boy

  1. 5 out of 5


    I planted (actually just sprinkled the seeds on the soil surface) the whole package in a 4 foot square plot in my front yard. They grew very succesfully and I used them in mini bouquets with sweet peas. They are a great way to add blue to your garden. After a first bloom I cut them down to about half the stem and am now getting a second bloom in the early fall.

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