Nicotiana mutabilis Marshmallow Seeds Ref: TM01406552 SowingSow February to May. Place seed on the surface of good free draining, seed compost. Do not cover the seed. Place in a propagator or seal container inside a polythene bag and place at 20-25C (68-77F) until after germination which takes 7 to 21 days. Do not exclude light, as this helps germination.GrowingTransplant seedlings when large enough to handle into trays or 7.5cm (3 inch) pots. Grow on in cooler conditions for 10 to 15 days before planting out after all risk of frost, 90cm (36 inches) apart.Aftercare FloweringSummer to AutumncroppingPlant typeHalf Hardy Annual Price: £2.09 Quantity: