For transplants, sow up to 100 seeds in a sterile seedling mix in a 4-6 inch pot. Cover the seeds to a depth of 1/8 inch. Place in a warm location and keep moist. If the tops reach over 5 inches before you transplant, cut to 3 inches high.
Sow at a depth of approx. 0.23 inches (0.6 cm) and aim for a distance of at least 3.9 inches (10.0 cm) between Bunching onion plants. Soil temperature should be kept higher than 13°C / 55°F to ensure good germination.By our calculations, you should look at sowing Guardsman about 28 days before your last frost date.
When planting out, take the clump and separate the grass-like seedlings and place in a shallow trench, 4-5 inches apart. Fill the trench around the seedlings and then water. Onion seedlings are tough and will perform amazingly well.
As Guardsman is very hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.