Sow at a depth of approx.
0.1 inches (0.25 cm) and aim for a distance of at least
0.2 inches (0.5 cm) between Hollyhock plants.
By our calculations, you should look at sowing Chater's Double Purple about 56 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Chater's Double Purple is a very hardy plant.