Information from Chocolate Flower Farms seeds:
Sow in February to March, or September to October. 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. Keep at a constant temperature of between 15-20 C (59-68 F). After sowing, do not exclude light, as this helps germination. Keep the surface of the compost moist but not waterlogged. Germination will usually take place within 10-21 days. Take care not to provide too high a temperature, as this can prevent germination.

When large enough to handle, transplant seedlings into 7.5 cm. (3 in) pots or trays. Gradually acclimatise to outdoor conditions for 10-15 days before planting out, after all risk of frost has passed. Plant 15-23 cm (6-9 in.) apart, or plant into baskets or containers. For best results, provide a light, well-drained soil in full sun.

Overwinter September sowings in a coldframe, then plant out the following spring. Spring sowings will give flowers during early summer, while autumn sowings will bloom the following spring.

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