Try to aim for a seed spacing of at least
11.7 inches (30.0 cm) and sow at a depth of around
5.85 inches (15.0 cm).
By our calculations, you should look at sowing Bonnie Dundee about 14 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Bonnie Dundee is a tender plant.