Sow at a depth of approx.
0.47 inches (1.2 cm) and aim for a distance of at least
3.12 inches (8.0 cm) between Cabbage plants. For optimal germination, soil temperature should be a minimum of
4°C / 39°F.
By our calculations, you should look at sowing Durham Early about 45 days before your last frost date.
Durham Early is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.