Petunia Grand Rapids Mixed F1 Seeds Ref: TM01401695 SowingSow late winter to mid spring at 21-24C (70-75F) on the surface of a good seed compost and gently firm down. Keep damp but not wet. Do not exclude light, sealing in a polythene bag after sowing is helpful. Germination usually takes 10-21 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, 30cm (12in) apart in a sunny spot on light well drained soil. For pot plants, transplant seedlings into 7.5cm (3in) pots; grow cool, well ventilated, give plenty of light, but shade from direct sun.Aftercare FloweringSummer to frostcroppingPlant typeHalf-hardy Annual Price: £2.99 Quantity: