Aim to sow
1.95 inches (5.0 cm) deep and try to ensure a gap of at least
1.95 inches (5.0 cm). Soil temperature should be kept higher than
16°C / 61°F to ensure good germination.
By our calculations, you should look at sowing Palace F1 about 15 days after your last frost date.
As Palace F1 is very hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.