Sow in greenhouse or propagator in early spring, very shallowly in moist seed compost at 21-24C (70-75F).
Prick out when large enough to handle and grow on at 15C (60F). Gradually acclimatise to outdoor conditions for 10-15 days before planting out after all risk of frost 30cm (12in) apart in a sunny spot and well drained soil.