Sow
0.5 inches (1.27 cm) deep with a guideline distance of
1.88 feet (58.0 cm). Soil temperature should be kept higher than
21°C / 70°F to ensure good germination.
By our calculations, you should look at sowing Sun Jewel about 14 days before your last frost date.
As Sun Jewel is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.
By our calculations, you should look at planting out Sun Jewel about 88 days before your last frost date.