Try to aim for a seed spacing of at least
11.7 inches (30.0 cm) and sow at a depth of around
0.04 inches (0.1 cm). For optimal germination, soil temperature should be a minimum of
18°C / 64°F.
By our calculations, you should look at sowing Whirlygig about 56 days before your last frost date.
Whirlygig is half hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.