Sow
0.25 inches (0.64 cm) deep with a guideline distance of
0.98 inches (2.5 cm). For optimal germination, soil temperature should be a minimum of
20°C / 68°F.
By our calculations, you should look at sowing Chelsea about 60 days before your last frost date.
Chelsea is tender, so ensure you wait until all danger of frost has passed in your area before considering planting outside.