Centaurea seeds (Cornflower seeds ) cyanus Black Ball Seeds Ref: TM01401328 SowingSowing Time: March to April. Sow thinly, 3mm (1/8in) deep in drills 30cm (12in) apart in well-cultivated soil which has been raked to a fine tilth. Water ground regularly, especially in dry periods.<p>Can also be sown August to September for early summer flowering next year. Sow in pots or trays of moist seed compost and cover with a very fine sprinkling of compost or vermiculite. Keep at between 15-20C (59-68F). After sowing, do not exclude light as this helps germination. Keep the surface of the compost moist but not waterlogged; germination will usually take 14-21 days. When large enough to handle, transplant seedlings into 7.5cm (3in) pots or trays. Overwinter plants in cool, light, frost-free conditions before planting out the following spring, or grow on as greenhouse pot plants.GrowingWhen large enough to handle, thin out seedlings to 15cm (6in) apart.Aftercare FloweringSummercroppingPlant typeHardy Annual Price: £1.69