Sow at a depth of approx.
0.49 inches (1.25 cm) and aim for a distance of at least
4.68 inches (12.0 cm) between Sunflower plants. Soil temperature should be kept higher than
13°C / 55°F to ensure good germination.
By our calculations, you should look at sowing Eclipse about 21 days before your last frost date.
As Eclipse is half hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.
The botanical epithet is from the Latin annuus meaning “annual”.