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botanical name:
Centaurea cyanus 'Blue Diadem'
Centaurea cyanus 'Blue Diadem' © Deeproot Plant Base
common name:  Cornflower
family:  Asteraceae
characteristics: annual/biennial
height: 0.75m
width: 0.30m
growth rate: medium
growth habit:
leaf colour: grey-green
flower colour: blue
stem/bark: grey-green
main season: Summer
aspect: full sun
conditions: dry soil, moist soil
preferred soil pH: neutral-alkaline
minimum temp: -20°C
USDA zone: 4 to 8
Hardy annual with greyish green foliage and larger than usual, double, rich blue flowers produced on tall stems over a long period in summer.

Well drained soil in full sun. Drought tolerant and thrives on chalky soils.

From seed, sown directly in spring or in a cool greenhouse or conservatory in late summer to early autumn. Grow cool, in full light and water sparingly.

Borders, bedding and containers.

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