Soak seed in warm water for 36 hours before sowing and carefully remove the orange fluff from the side of the seed as this can inhibit germination if left on. Sow the seeds into pots or trays of moist seed compost and cover with a 6mm (¼in) layer of compost or vermiculite. Place containers into a propagator or warm place, and keep at a temperature of between 18-29C (65-85F). After sowing, do not exclude light as this helps germination. Keep the surface of the compost moist but not waterlogged; germination can take 1-6 months. When large enough to handle, transplant seedlings into 7.5cm (3in) pots or trays.
When well grown, pot on as necessary, however always keep plants slightly pot-bound as this encourages flowering. Grow in soil-based potting mix and place in good, natural light.
Plants can be stood outside during the summer, but will need the winter protection of a conservatory or greenhouse. Feed monthly with balanced liquid fertiliser during spring and summer, water sparingly during winter.