For best results, sow in a seed tray in autumn 2mm (1⁄16") deep, cover with glass and leave in a cold frame to overwinter. Bring inside in early spring to assist germination. Alternatively, sow March to May in a small pot. Enclose pot in a plastic bag or sealed container to conserve moisture and place in the bottom of a refrigerator (5°C) to pre-chill. After three weeks, remove and grow cool at 13-16°C (55-60°F). Plant out to final position when seedlings are large enough to handle. Note that flowers can be used in salads.