Helianthus annuus Solar Eclipse F1 Hybrid Seeds - Sunflower seeds Ref: TM01407217 SowingSow March to May. Sow thinly, 12mm (½in) deep in drills 30cm (12in) apart in well cultivated soil raked to a fine tilth. Germination usually takes around 21 days.<p>Alternatively, you can sow indoors in late winter/early spring for earlier flowering. Sow individually into 7.5cm (3in) pots at 20-30C (68-86F). When well grown, gradually acclimatise to outdoor conditions before planting out after all risk of frost.GrowingWhen large enough to handle, thin seedlings to 30cm (12in) apart.Aftercare Prefers a well drained soil in full sun.FloweringSummercroppingPlant typeHardy Annual Price: £1.99 Quantity: