Look to ensure a distance
8.97 inches (23.0 cm) between seeds when sowing - bury at a depth of at least
0.47 inches (1.2 cm) deep.
By our calculations, you should look at sowing Nelson F1 about 21 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Nelson F1 is a hardy plant.