Try to aim for a seed spacing of at least
1.95 inches (5.0 cm) and sow at a depth of around
0.2 inches (0.5 cm). Soil temperature should be kept higher than
18°C / 64°F to ensure good germination.
By our calculations, you should look at sowing Medusa about 38 days before your last frost date.
Ensure that temperatures are mild (minimum night temperatures should be around 4°C / 39°F) and all chance of frost has passed before planting out, as Medusa is a tender plant.