Try to aim for a seed spacing of at least
5.85 inches (15.0 cm) and sow at a depth of around
0.78 inches (2.0 cm). Soil temperature should be kept higher than
13°C / 55°F to ensure good germination.
By our calculations, you should look at sowing 3 Root Grex about 14 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as 3 Root Grex is a half hardy plant.