If you soak the seeds in a glass of water overnight, before sowing them, they germinate a lot better!
Try to aim for a seed spacing of at least 7.8 inches (20.0 cm) and sow at a depth of around 0.5 inches (1.27 cm). Soil temperature should be kept higher than 15°C / 59°F to ensure good germination.As the seedlings develop, thin to achieve a final spacing of 25cm.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Dwarf Jewel is a hardy plant.