Spring sowings will give flowers during early summer, whilst summer and autumn sowings will bloom the following winter or spring.
Sow February to March or June to September. Sow seed on the surface of lightly firmed, moist seed compost in pots or trays. Cover with a very fine sprinkling of compost or vermiculite. Seal container inside a polythene bag and keep at a temperature of between 15-20C (59-68F). After sowing, do not exclude light as this helps germination. Keep the surface of the compost moist but not waterlogged; germination will usually take 14-21 days. Take care not to provide too high a temperature, as this can prevent germination.
For best results, provide a light, well-drained soil in full sun or part shade.
Over winter September sowings in a cold frame then plant out the following spring.