Keep in mind when planting that Delta White/Blotch is thought of as half hardy, so it will need protecting in periods of cold weather.
Aim to sow
0.0 inches (0.0 cm) deep and try to ensure a gap of at least
8.97 inches (23.0 cm). Soil temperature should be kept higher than
18°C / 64°F to ensure good germination.
By our calculations, you should look at sowing Delta White/Blotch about 90 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Delta White/Blotch is a half hardy plant.