Photo by Melody

PlantFiles: Persian Cornflower, Knapweed
Centaurea dealbata

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Centaurea (sen-TAR-ee-uh) (Info)
Species: dealbata (day-al-BAH-tuh) (Info)

Synonym:Centaurea hypoleuca

One vendor has this plant for sale.

22 members have or want this plant for trade.


18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

15-18 in. (38-45 cm)
18-24 in. (45-60 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade


Bloom Color:

Bloom Time:
Late Spring/Early Summer
Mid Summer


Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
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:

Propagation Methods:
By dividing the rootball
From seed; direct sow after last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

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By naturepatch
Thumbnail #1 of Centaurea dealbata by naturepatch

By hczone6
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By PerennialGirl
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There are a total of 11 photos.
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5 positives
No neutrals
No negatives

Gardeners' Notes:

Positive Malus2006 On Apr 4, 2008, Malus2006 from Coon Rapids, MN (Zone 4a) wrote:

Tough species - I have never seen them selfseed. Bloom a bit later than C. montana and have heavily lobed leaves that stays close to the ground. More uncommonly sold compare to C. montana. A common name is Tall Bachelor's Button.

Positive bakingbarb On Jun 11, 2007, bakingbarb from Lynnwood, WA wrote:

Flowers are wonderful addition to the garden. The plant is spreading though so plant it where you have lots of space. Also it is easy to dig up the baby plants, just make sure to get some roots with it.

Positive bigcityal On Jul 4, 2006, bigcityal from Menasha, WI (Zone 5a) wrote:

Nice carefree flower. Finer cut foliage than regular cornflower. Gold finches eat all the seeds so I don't know if it self seeds.

Positive flowercrazy39 On Aug 10, 2005, flowercrazy39 from Manchester, NH wrote:

Mine just flowered this summer for the first time and I love it! No mildew, no bugs eat it, just beautiful flowers, no fuss.

Positive peonylady On Jul 23, 2004, peonylady from Anchorage, AK wrote:

Our USDA zone is usually 3, although we have had
several favorable winters lately. The Persian Cornflower
has performed very well, has not reseeded agressively here,
grows strongly, may need dividing every third year to keep it
in bounds, color and form is very attractive, and it is
especially nice to photograph.


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

Booneville, Arkansas
Edwardsville, Illinois
Saint Charles, Illinois
Wauconda, Illinois
Foxboro, Massachusetts
Mason, Michigan
Pinconning, Michigan
Hopkins, Minnesota
Minneapolis, Minnesota (2 reports)
Rosemount, Minnesota
Saint Paul, Minnesota
Saint Joseph, Missouri
Manchester, New Hampshire
Buffalo, New York
Wallkill, New York
Richfield, Ohio
Bartlesville, Oklahoma
, Ontario
Knoxville, Tennessee
Austin, Texas
Weatherford, Texas
Salt Lake City, Utah
Leesburg, Virginia
Cathan, Washington
Kalama, Washington
Lynnwood, Washington
Poulsbo, Washington
Seattle, Washington
Eau Claire, Wisconsin
Menasha, Wisconsin

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