Photo by Melody

PlantFiles: Bachelor's Button, Cornflower
Centaurea cyanus 'Polka Dot Mix'

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

2 vendors have this plant for sale.

17 members have or want this plant for trade.


12-18 in. (30-45 cm)
18-24 in. (45-60 cm)

9-12 in. (22-30 cm)

Not Applicable

Sun Exposure:
Full Sun


Bloom Color:
Medium Blue
White/Near White

Bloom Time:
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
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

Click thumbnail
to view:

By Weezingreens
Thumbnail #1 of Centaurea cyanus by Weezingreens

By htop
Thumbnail #2 of Centaurea cyanus by htop

By Xenomorf
Thumbnail #3 of Centaurea cyanus by Xenomorf

By dalmatian_fan87
Thumbnail #4 of Centaurea cyanus by dalmatian_fan87

By chavelonni
Thumbnail #5 of Centaurea cyanus by chavelonni


1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive Weezingreens On Aug 31, 2002, Weezingreens from Seward, AK (Zone 3b) wrote:

Polka Dot is a delightful mix of semi-dwarf bachelor's buttons. They bloom in many colors, some bi-colors and earier than many other varieties.

If starting the seeds indoors, be sure to exclude light during germination.


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

Seward, Alaska
El Mirage, Arizona
Phoenix, Arizona
Springdale, Arkansas
Citrus Heights, California
Colorado Springs, Colorado
Lincoln, Maine
Halifax, Massachusetts
Harrisburg, Pennsylvania
Selinsgrove, Pennsylvania
San Antonio, Texas
Kalama, Washington

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