Sow at 15-20°C (60-68°F) in pots or trays using a good quality compost, covering the seed lightly with a sprinkling of compost, or vermiculite. Place in a propagator and keep soil moist at all times. Germination 15-20 days. When the seedlings are large enough to handle transfer and grow on in cooler conditions. When the risk of frost has passed, acclimatise them to outdoor conditions before planting out spacing them 15cm (6") apart. Alternatively sow directly outdoors in May/June.