Sow at a depth of approx.
0.47 inches (1.2 cm) and aim for a distance of at least
8.97 inches (23.0 cm) between Brussels sprout plants.
By our calculations, you should look at sowing Dwarf Improved about 21 days before your last frost date.
Dwarf Improved is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.