Look to ensure a distance
5.85 inches (15.0 cm) between seeds when sowing - bury at a depth of at least
0.78 inches (2.0 cm) deep. Soil temperature should be kept higher than
13°C / 55°F to ensure good germination.
By our calculations, you should look at sowing Perfect 3 about 14 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Perfect 3 is a half hardy plant.