Try to aim for a seed spacing of at least
7.8 inches (20.0 cm) and sow at a depth of around
0.51 inches (1.3 cm). Soil temperature should be kept higher than
10°C / 50°F to ensure good germination.
By our calculations, you should look at sowing touch of red buff about 35 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as touch of red buff is a half hardy plant.