Sow
0.47 inches (1.2 cm) deep with a guideline distance of
3.12 inches (8.0 cm). Soil temperature should be kept higher than
4°C / 39°F to ensure good germination.
By our calculations, you should look at sowing All the year round about 45 days before your last frost date.
As All the year round is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.