Sow in trays of good quality, moist seed compost, 3mm (1/8") deep, in a propagator on a windowsill or in a greenhouse at approx. 18-210C (65-700F). 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. Prefers good Loamy soil in an open sunny position. Note that there are spikes on the stems.
Ideal for beds and borders, patio pots and containers, greenhouses. Attractive to bees. Suitable for cut flowers. Prefers full sun. Feed with a potassium rich feed throughout the summer to enhance blooms.