Photo by Melody

PlantFiles: Bachelor's Button, Cornflower
Centaurea cyanus 'Blue Boy'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Centaurea (sen-TAR-ee-uh) (Info)
Species: cyanus (SY-an-us) (Info)
Cultivar: Blue Boy

One vendor has this plant for sale.

31 members have or want this plant for trade.


24-36 in. (60-90 cm)

9-12 in. (22-30 cm)

Not Applicable

Sun Exposure:
Full Sun


Bloom Color:
Medium Blue

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Collect seedhead/pod when flowers fade; allow to dry

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1 positive
1 neutral
No negatives

Gardeners' Notes:

Positive CurtisJones On Nov 25, 2008, CurtisJones from Longmont, CO wrote:

From your friends at Botanical Interests: Annual. Summer bloom. 20" - 24" tall. Full sun. Drought tolerant. The sky blue flowers of this tall plant are attractive as cut or dried flowers. Will "naturalize" - seed drops quite readily and produces another crop of flowers. Seed must have darkness to germinate. Sow at depth of 1/4". Seed to 1" apart and thin to 6" - 8" apart. Plants have fewer flowers when grown in rich, overfertilized soils. The worse the soil, the better! An additional fun story: When Napoleon forced Queen Louise of Prussia from Berlin, she hid her children in a corn field and kept them entertained and quiet by weaving wreaths of Cornflowers (Bachelor Button). One of the children, Wilhelm, ultimately became the emperor of Germany. Remembering his mother's bravery, he made the Cornflower a national emblem of unity. Bachelor Button is known in England as Cornflower. The plant often comes up in fields of grain. *Bees are attracted to blue flowers and love this variety.

Neutral berrygirl On Mar 4, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:

Brought to America from Europe in the 17th century and known to have been cultivated by Thomas Jefferson at Monticello. Plants will bloom throughout the growing season. Well maintained strain with all blue flowers. Extremely easy to grow and dries well. Self-seeding hardy annual, grows 2-3 ft tall.


This plant has been said to grow in the following regions:

North Little Rock, Arkansas
Berkeley, California
Irvine, California
Long Beach, California
Longmont, Colorado
Cordele, Georgia
Chicago, Illinois
Hinsdale, Illinois
Dubuque, Iowa
Peosta, Iowa
Brookville, Kansas
Sapphire, North Carolina
Cincinnati, Ohio
Painesville, Ohio
Denton, Texas
San Antonio, Texas
Chimacum, Washington

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