Aim to sow
0.47 inches (1.2 cm) deep and try to ensure a gap of at least
8.97 inches (23.0 cm).
By our calculations, you should look at sowing Revenge F1 about 21 days before your last frost date.
As Revenge F1 is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.