Cosmos bipinnatus Seeds Sea Shells Ref: TM01401306 SowingSow 3mm (1/8in) deep in spring at 21-24C (70-75F) in a good seed compost. Keep soil damp but not wet, sealing in a polythene bag after sowing is helpful. Germination usually takes 5-10 days.GrowingWhen seedlings are large enough to handle, transplant and grow on in cooler conditions. Gradually acclimatise to outdoor conditions for 10-15 days before planting out after all risk of frost, 60cm (24in) apart in a sunny spot on light well drained soil.Aftercare FloweringcroppingPlant typeHalf-hardy Annual Price: £1.99 Quantity: