Sow the seed 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 gradually to achieve a final spacing of 30cm (12") apart. Alternatively, sow direct during August or September to flower the following spring. Grow best in a fertile, well-drained soil in an open sunny position.