How Do You Plant Winter Onion Sets?
Onions are planted in the garden from seeds, transplants or sets. Onion sets are actually immature bulbs that grow into either green onions or bulbs. Green onions are the foliage of the onion sets while bulbs are formed once the sets mature. Spring sets are grown mostly for green onions, as warmer weather causes the onion plant to bolt and flower before the bulb is mature. For mature bulbs from sets, plant in fall for winter so the bulbs have time to mature before bolting. Step 1 Prepare a well-drained garden bed in full sun in early fall, approximately twelve weeks before the first frost date in your area. Lay a 2-inch layer of compost over the bed and till it in to a 10-inch depth to improve soil drainage. Step 2 Plant winter onion sets to a 1 1/2-inch depth in the soil. Space each set 3 inches apart to give the bulbs room to develop. Step 3 Water the bed thoroughly after planting so that the soil compacts slightly and there are no air pockets. Keep the soil evenly moist at all times
