Sow seed 2cm (Â¾in) deep in 7.5cm (3in) pots of good seed compost at 21-25Â°C (70-77Â°F). Place in a propagator or seal container in a polythene bag until after germination. Can also be sown direct outdoors once the soil has warmed. Do not sow in cold soils. Sow 2 seeds every 1.2m (4ft) and thin out to the best seedling. Ideally grow under cloches until the plant is established.