Sow at a depth of approx.
0.49 inches (1.25 cm) and aim for a distance of at least
5.85 inches (15.0 cm) between Romaine lettuce plants. For optimal germination, soil temperature should be a minimum of
5°C / 41°F.
By our calculations, you should look at sowing Claremont about 60 days before your last frost date.
Claremont is tender, so ensure you wait until all danger of frost has passed in your area before considering planting outside.