Sow
0.0 inches (0.0 cm) deep with a guideline distance of
5.85 inches (15.0 cm). Soil temperature should be kept higher than
13°C / 55°F to ensure good germination.
By our calculations, you should look at sowing Burpee's Petite Mix about 56 days before your last frost date.
As Burpee's Petite Mix is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.