Try to aim for a seed spacing of at least
0.98 inches (2.5 cm) and sow at a depth of around
0.25 inches (0.64 cm). For optimal germination, soil temperature should be a minimum of
20°C / 68°F.
By our calculations, you should look at sowing Heavenly blue about 60 days before your last frost date.
Heavenly blue is tender, so ensure you wait until all danger of frost has passed in your area before considering planting outside.