Sow thinly in trays of seed compost, cover lightly with sieved compost, firm gently and keep moist. Cover with glass, polythene or propagator lid. Keep at approx. 15-20°C, germination may be slow and erratic. Seedlings typically appear after 14-42 days. Remove cover when seedlings appear and when large enough, transplant to individual 7.5cm or 9cm pots. Stand seedlings outside for a few days late May to acclimatise (avoiding frosts). Transplant 60cm apart in flowering position.