Helianthus annuus Double Shine F1. Hybrid Seeds - Double sunflower seeds Ref: TM01406302 SowingSow early spring to early summer outdoors where they are to flower. Prepare the ground well and rake to a fine tilth before sowing. Sow 12mm (½in) deep in rows 45cm (18in) apart. Germination usually takes approximately 21 days.GrowingWhen large enough to handle thin out to 45cm (18in) apart.Aftercare They prefer a sunny open site but will grow in most sites and soils.FloweringSummercroppingPlant typeHardy Annual Price: £2.69 Quantity: