Sow in trays of good quality, moist seed compost, 3mm (1/8") deep, in a propagator on a windowsill or in a greenhouse at approximately 18-21ºC (65-70ºF). Transfer seedlings when large enough to handle into further trays spacing them 5cm (2") apart and grow on. Plant outside in late May-June, after acclimatising to outside conditions, about 40cm (16") apart.
Ideal for beds and borders, patio pots and containers, hanging baskets. Prefers full sun. Feed with a potassium rich feed throughout the summer to enhance blooms.