Sow at a depth of approx.
0.25 inches (0.64 cm) and aim for a distance of at least
11.7 inches (30.0 cm) between Common zinnia plants.
By our calculations, you should look at sowing violet queen about 21 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as violet queen is a tender plant.