Try to aim for a seed spacing of at least
7.8 inches (20.0 cm) and sow at a depth of around
1.95 inches (5.0 cm). Soil temperature should be kept higher than
10°C / 50°F to ensure good germination.
By our calculations, you should look at sowing Serendipity triple sweet about 5 days before your last frost date.
Ensure that temperatures are mild (minimum night temperatures should be around 5°C / 41°F) and all chance of frost has passed before planting out, as Serendipity triple sweet is a tender plant.