Sow indoors, February-April, to flower the same year, 0.5cm (¼") deep, in a tray of compost. A temperature of 15-20°C (60-68°F) is ideal. Keep moist. Seedlings usually appear in 14-21 days. Transplant them, 5cm (2") apart, to other trays, when large enough to handle. Gradually accustom young plants to outside conditions, before planting out into well-drained soil, May-October, 20cm (8") apart, when frosts are over. Or, sow outdoors, April-July to flower the following year, in a seed bed, 0.5cm (¼") deep, into finely-prepared, well-drained soil, which has already been watered. Thin seedlings to 5cm (2") apart, before planting out to flowering position in autumn, spacing 20cm (8") apart. Flowers: June to October.
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