Sow outdoors where they are to flower, 0.5cm (¼”) deep directly into finely prepared soil which has been already watered. Seedlings usually appear in 14-28 days. Water well until plants are established. Thin seedlings as required to allow development. Sowings made in curves rather than straight lines often create a more pleasing effect.
Or sow indoors in trays of compost. Water well and place in a greenhouse or cold frame. Keep moist. Transplant seedlings 5cm (2”) apart to other trays when large enough to handle. Gradually accustom young plants to outside conditions before planting out 20cm (8”) apart.
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