General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Mesic
Soil pH Preferences: Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 8b
Plant Height: 24 to 30 inches
Plant Spread: 18 to 24 inches
Leaves: Other: Pinnately-lobed basal foliage (to 18-24" long) is dark green above with whitish hairs underneath.
Flowers: Showy
Flower Color: Lavender
Pink
Bloom Size: 1"-2"
Flower Time: Late spring or early summer
Underground structures: Taproot
Suitable Locations: Xeriscapic
Uses: Cut Flower
Will Naturalize
Wildlife Attractant: Bees
Butterflies
Propagation: Seeds: Needs specific temperature: 60 to 85°
Days to germinate: 10 to 14
Other info: Flowers first year from seed.
Propagation: Other methods: Division

Image
Common names
  • Knapweed
  • Persian Cornflower
Botanical names
  • Accepted: Psephellus dealbatus
  • Synonym: Centaurea dealbata

Photo Gallery
Location: Clinton, Michigan 49236
Date: 2017-11-01
Centaurea  dealbata, 2016, Cornflower or Knapweed, sen-tore-EE-uh
Location: All pictures taken in/on my gardens/greenhouse/property
Date: 2019-02-27
Location: Swanton Vermont
Date: 2022
Location: my brothers garden, Vichte, Belgium
Date: 10th June 2007
Young plant
Location: Kalama, Wa
Date: 2011-07-07
  • Uploaded by Joy
Location: Main Botanical Garden at the Academy of Sciences in Moscow
credit: Andrey Korzun

Photo by Leo Michels

Courtesy Outsidepride
  • Uploaded by vic
Location: Indiana  Zone 5
Date: 2012-07-26
seeds being eaten by American goldfinch  (planted among beebalm)
Location: Lucketts, Loudoun County, Virginia
Date: 2016-03-16
Location: In my garden in Kalama, Wa.
Date: 2008-06-26
  • Uploaded by Joy
Location: my brothers garden, Vichte, Belgium
Date: 27th June 2010
Location: Clinton, Michigan 49236
Date: 2017-11-01
Centaurea  dealbata, 2016, Cornflower or Knapweed, sen-tore-EE-uh
Location: my brother's garden, Vichte, Belgium
Date: 2013-07-14
Location: Pittsburgh, Pennsylvania
Date: 2013-05-19
Location: Pittsburgh, Pennsylvania
Date: 2013-05-23
Location: In my front yard in Holladay, UT
Date: Spring
Bud of Centaurea dealbata
Location: Indiana  Zone 5
Date: 2012-07-26
mid summer after flowering
Location: In my front yard in Holladay, UT
Date: Spring
Close-up of foliage of Centaurea dealbata
Location: In my front yard in Holladay, UT
Date: Spring
Side view of Centaurea dealbata
Location: In my front yard in Holladay, UT
Date: Spring
Centaurea dealbata
Location: In my front yard in Holladay, UT
Date: Spring
Centaurea dealbata
Location: In my garden in Kalama, Wa.
Date: 2006-06-05
  • Uploaded by Joy
Location: Main Botanical Garden of Academy of Sciences in Moscow
credit: Kor!An (Андрей Корзун)
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Plant Events from our members
aspenhill On May 24, 2012 Obtained plant
Lazy S'S Farm - qty 1
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