Start seeds indoors six weeks before last frost date.
Try to aim for a seed spacing of at least 0.78 inches (2.0 cm) and sow at a depth of around 0.39 inches (1.0 cm). Soil temperature should be kept higher than 12°C / 54°F to ensure good germination.Plant to first set of leaves to promote strong root growth.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as 6 colour mix is a tender plant.