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 Butterhead lettuce plants. Soil temperature should be kept higher than
5°C / 41°F to ensure good germination.
By our calculations, you should look at sowing Marvel of Four Seasons about 60 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Marvel of Four Seasons is a tender plant.