Sow February/March in a propagator in pots or trays on a windowsill or in a greenhouse at approximately 20-22ºC (68-72ºF) onto the surface of quality, finely sieved, firmed, moist compost as light aids germination (germination 10-14 days). Transplant seedlings, spacing them out 5cm (2") apart in a seed tray and grow on. Plant out 25cm (10") apart late May/early June. Alternatively sow outdoors during April/May in finely raked soil where they are to flower. Thin seedlings to the above spacing.