Sow at a depth of approx.
0.0 inches (0.01 cm) and aim for a distance of at least
1.95 feet (60.0 cm) between Eastern purple coneflower plants. Soil temperature should be kept higher than
25°C / 77°F to ensure good germination.
By our calculations, you should look at sowing Augustkönigin about 56 days before your last frost date.
As Augustkönigin is very hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.