Sow seeds in trays or pots of seed compost and firm in. Maintain at 18C (65F) or thereabouts, a warm windowsill often suits well. Plant out to 5in (12cm) pots when seedlings reach 2in (5cm) high. Plant the seedlings out under glass in October, or else harden off outdoors in December and plant in a warm sunny position. When the plants flower, apply a syringe of water to the flowers to assist setting. Feed regularly with liquid fertiliser. For best results, grow in an unheated frame or greenhouse or outdoors in a hot sunny area in rich soil.