Sow outdoors:Â where they are to flower, 0.5cm(Â¼in) deep, directly into finely prepared soil which has already been watered. Seedlings usually appear in 14-28 days. Thin seedlings to 30cm(1ft) apart. Water well until plants are established.
Sow indoors:Â in trays of compost. Water well and place in a greenhouse or cold frame. Keep moist. Transplant seedlings 5cm(2in) apart to other trays when large enough to handle. (Always hold seedlings by a leaf, never by the stem.) Gradually accustom young plants to outside conditions (avoid frosts), before planting out 30cm(1ft) apart, when frosts are over.