Prechill seed for 3 weeks prior to sowing in pots or trays of moist potting mix. Cover with a fine sprinkling of vermiculite. Place in a propagator or seal inside a polythene bag and keep at 60-65F. After sowing, do not exclude light as this aids germination. Keep the surface of the compost moist but not waterlogged; germinates in 1-4 months.