Sowing: Sow in February to June or September to October
Seed is best sown in a cold frame in spring or autumn but can also be sown directly where they are to flower.
Fill pots or trays with a peaty compost. Stand the post in water to soak and then drain, sow the seeds on the surface and cover with a fine layer of sieved compost. Keep the surface of the compost moist but not waterlogged. Germination usually takes 7 to 21 days. Prick out the seedlings into 7cm (3in) pots when they are large enough to handle and plant them out in their permanent positions in the early summer.