Sow the seed thinly 13mm (½") deep direct into finely raked, moist, warm, weed free soil where the plants are to flower. Germination usually takes 10-15 days. As the seedlings develop, thin them out gradually to achieve a final spacing of 30cm (12"). For early flowering the following year, sow direct August/September where the plants are to flower. Sow March-May outdoors for flowers June-September, or August-September for the following May-July.