Aim to sow
0.39 inches (1.0 cm) deep and try to ensure a gap of at least
0.98 inches (2.5 cm).
By our calculations, you should look at sowing Va-Va-Voom about 21 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Va-Va-Voom is a half hardy plant.