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.