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