Aim to sow
0.25 inches (0.64 cm) deep and try to ensure a gap of at least
11.7 inches (30.0 cm).
By our calculations, you should look at sowing Swizzle scarlet & yellow about 21 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Swizzle scarlet & yellow is a tender plant.