For early flowering sow 3 seeds 13mm (½") deep per 10cm (4") pot in a greenhouse, or indoors at approximately 13-15°C (55-60°F). Germination 10-21 days. Acclimatise the plants to outside conditions and plant out in April-May spacing them 15cm (6") apart. Alternatively, sow direct into finely raked, moist, warm, weed-free soil where the plants are to flower 13mm (½") deep, in late April-May. Thin seedlings to achieve a final spacing of 15cm (6") between plants. Remove growing tips after 3-4 pairs of leaves have developed to promote more flowers and a bushier plant. May also be sown in September-October in a cold frame/unheated greenhouse to over-winter. Plant out young plants in March-April to provide earliest blooms.