Look to ensure a distance
7.92 inches (20.32 cm) between seeds when sowing - bury at a depth of at least
0.49 inches (1.25 cm) deep. Soil temperature should be kept higher than
21°C / 70°F to ensure good germination.
By our calculations, you should look at sowing Pioneer about 7 days after your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Pioneer is a tender plant.