Aim to sow
0.0 inches (0.01 cm) deep and try to ensure a gap of at least
11.7 inches (30.0 cm). Soil temperature should be kept higher than
65°C / 149°F to ensure good germination.
By our calculations, you should look at sowing Giant Exhibition Tartan about 56 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Giant Exhibition Tartan is a tender plant.