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 regal red about 45 days before your last frost date.
As regal red is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.