Sow 5mm (¼in) deep. Cover with a fine layer of compost and firm gently. Keep moist. Seedlings appear in 10-14 days.
Transplant seedlings to final position when large enough to handle or 15cm (6in) tall. Choose a warm sunny sheltered spot outside. Space the plants 50cm (20in) apart into well-drained soil. Keep weed free and moist.
Prepare the planting site well with compost and pre-planting fertiliser. To ensure healthy crops apply a liquid feed every 2-3 weeks once flowers form. In windy areas, support the branches with stakes or canes.