Sow direct into finely raked, moist, warm weed-free soil where the plants are to flower at a depth of 6mm (¼") and cover the seed lightly with soil. Germination usually takes 14-21 days. Thin out young plants to a final spacing of 20cm (8") apart, removing any competing weeds. Seeds can also be sown in Aug-Sept for flowering the following year. Pinching out the growing tips before transplanting will encourage bushier plants.