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PlantFiles: Persian Cornflower, Knapweed
Centaurea dealbata 'Steenbergii'

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

One vendor has this plant for sale.

One member has or wants 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:
Unknown - Tell us

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


1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive Daylahmnas On Jun 20, 2009, Daylahmnas from Chester, MA (Zone 3b) wrote:

This centaurea found its way into my garden simply because I wanted variety and was purchasing the centaurea montana. Three years later this dealbata has outgrown the montana and is a better and more significant addition to the garden than the original montana decision. The leaves on the centaurea dealbata are different than any other plant in the expanse of the flower field while its flower is soft in texture and hot pink in color it makes a statement from near and far. Casual garden guests find this plant striking and are often interested in aquisition. Last year, the second year of it's life here in the expanse, it had to be divided and now I have three of this treasured plant. This year the original plant is 3 ft. tall and the same wide. It will be divided again. It is growing in plain top soil and wood chips without fertilizer or frequent watering although this year the frequent rain has proven that it responds positively to consistent irrigation. Overall a prolific grower and consistent bloomer with a overall serrated light grey-sage leaf style that is different than all other plants in the expanse. Truely an art form.


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

Chester, Massachusetts
Huntington, Massachusetts

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