Sunflower Seeds - Helianthus annuus Bicentenary Seeds Ref: TM01407590 SowingSow thinly, 12mm (½ inch) deep in drills 30cm (12 inches) apart in well cultivated soil raked to a fine tilth. Germination takes around 21 days. When large enough to handle, thin to 30cm (12 inches) apart.<p>For earlier flowering sow indoors, individually in 7.5cm (3 inch) pots at 20-25C (68-77F), When well grown, gradually acclimatise to outdoor conditions before planting out after all risk of frost.</p>GrowingThin out to 30cm (12 inches) apart, when large enough to handle.Aftercare They prefer a sunny open site but will grow in most sites and soils. In order to spread the flowering over a longer period make 2 sowings allowing 14 days between them, or pinch out the growing point of some of the plants at the 6 leaf stage.FloweringSummercroppingPlant typeHardy Annual Price: £1.69 Quantity: