Try to aim for a seed spacing of at least
5.85 inches (15.0 cm) and sow at a depth of around
0.0 inches (0.0 cm). For optimal germination, soil temperature should be a minimum of
13°C / 55°F.
By our calculations, you should look at sowing Helen Weibull about 56 days before your last frost date.
Helen Weibull is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.