The Gardener's Almanac

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Centaurea
Common name; Cornflower
 
 

The annual species cyanus will grow to around 300mm (12") high and the perennial montana to around 50-600mm (18"-24") high.

Grow centaurea in any fertile, well-drained garden soil, in a sunny position.

Dead-heading is recommended for both species to prolong the flowering period.

 
cyanus   montana

Week 14; Sow seeds in pots or trays of seed compost and germinate 18°C (64°F)

Germination should take around four to five days.

Week 16; When seedlings are large enough to handle prick out into pots/tray or boxes of potting compost and grow on in a cold frame until planting out time.

Week 21; Plant out cyanus 300 (12") apart.

Week 40; Plant out montana 300 (12") apart.

Established plants of montana can be divided and planted out immediately at this time.

 

 
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Related Links

Coldframe

Compost

Deadheading

Division

Heating

Planting out

Pricking out

Seed sowing