Scientific Name: Psephellus dealbatus ( syn. Centaurea dealbata )
Common Name: Persian cornflower, knapweed
Family Name: Asteraceae
Origin: Central / west Asia
Hardiness Zone: Zone 3: (-40 to -34 °C)
Plant Type: Herbaceous perennial
Mature Size: 0.4 - 0.7m x 0.3 - 0.6m (height x width)
Habit: Upright
Form: Oval - vertical
Texture: Fine
Landscape Uses: Attract beneficial insects, Attract butterflies, Cut flower or foliage, Group or mass planting, Perennial border, Tall background, Woodland margin
Exposure: Full sun
Soil or Media: Well-drained
Leaves: Simple, Lobed, Alternate, Basal, Soft flexible, Pinnate venation, Pubescent, Obovate, Entire
Flowers: Head (capitulum), White, Blue, Violet, Purple, Pink, May-Jun-Jul-Aug-Sep
Fruit: Achene, Brown, Sep-Oct
Key ID Features:
Basal leaf petioles 25-35cm long, blades pinnately-lobed, 30-45cm long x 10-15cm wide, irregularly to deeply divided (sometimes appearing as false leaflets but midrib blase tissue present at least near the apex), lower surface covered in silver hairs; flowering stem leaves alternate; flower heads appear shaggy, up to 5-8cm wide; florets commonly pinkish (less commonly bluish, purplish, or white).