Sow
0.47 inches (1.2 cm) deep with a guideline distance of
11.7 inches (30.0 cm). Soil temperature should be kept higher than
16°C / 61°F to ensure good germination.
By our calculations, you should look at sowing Green dragon about 14 days after your last frost date.
As Green dragon is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.