Try to aim for a seed spacing of at least
0.2 inches (0.5 cm) and sow at a depth of around
0.1 inches (0.25 cm).
By our calculations, you should look at sowing Chater's Chamois Rose about 56 days before your last frost date.
Chater's Chamois Rose is very hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.