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

Category:

Annuals

Height:

24-36 in. (60-90 cm)

Spacing:

9-12 in. (22-30 cm)

Hardiness:

Not Applicable

Sun Exposure:

Full Sun

Danger:

N/A

Bloom Color:

Medium Blue

Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Foliage:

Herbaceous

Silver/Gray

Velvet/Fuzzy-Textured

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:

Non-patented

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

Regional

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

show all

Gardeners' Notes:

1
positive
1
neutral
0
negatives
RatingContent
Positive

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 th... read more

Neutral

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.