Aim to sow
0.99 inches (2.54 cm) deep and try to ensure a gap of at least
2.92 feet (90.0 cm). Soil temperature should be kept higher than
16°C / 61°F to ensure good germination.
By our calculations, you should look at sowing Round about 42 days before your last frost date.
As Round is tender, 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 Round about 14 days after your last frost date.