Try to aim for a seed spacing of at least
11.7 inches (30.0 cm) and sow at a depth of around
0.25 inches (0.64 cm).
By our calculations, you should look at sowing Zahara starlight rose about 21 days before your last frost date.
Zahara starlight rose is tender, so ensure you wait until all danger of frost has passed in your area before considering planting outside.