Sow at any time of the year at 21-24°C (70-75°F) in a good seed compost. Sow seed on surface of compost and gently firm down. Keep soil damp but not wet. Do not exclude light. Use a heated propagator or seal in a polythene bag until after germination which usually takes 10-20 days.
When seedlings are large enough to handle, transplant into 8cm (3in) and finally 15cm (6in) pots. Pinch out shoot tips to encourage bushier plants.