Ensure a distance of
11.7 inches (30.0 cm) between seeds when sowing - look to sow at a depth of approximately
5.85 inches (15.0 cm).
By our calculations, you should look at sowing Butte about 14 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Butte is a tender plant.