Centaurea seeds (Cornflower seeds ) cyanus Polka Dot Mixed Seeds Ref: TM01401395 SowingOptimum Germination Temperature: 65-70F (18-20C). Sowing Depth: ¼in (6mm). Sowing Time: Sow March-April or August-September for overwintering. The seed can be sown outdoors where they are to flower in spring or autumn and thinned out to 12in (30cm) apart. Sown in the late summer/early autumn to produce even better plants for flowering next summer, and final thinning should be left until the spring so that the plants are about 45cm (18in) apart.GrowingSpace the plants 30cm (12in) apart in full sun in ordinary garden soil.Aftercare FloweringSummercroppingPlant typeHardy Annual Price: £1.89