Look to ensure a distance
0.98 inches (2.5 cm) between seeds when sowing - bury at a depth of at least
0.47 inches (1.2 cm) deep. Soil temperature should be kept higher than
16°C / 61°F to ensure good germination.
By our calculations, you should look at sowing Countess F1 about 15 days after your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Countess F1 is a half hardy plant.