Start Your Onions EarlySow onion seeds indoors 6-8 weeks before your last frost date in spring. For a summer harvest, plant sets (small bulbs) or transplants in the garden 3 weeks before the last frost date. In mild-winter regions, you can plant transplants in early winter for an early summer harvest.
Plant In Good SoilTo grow best, onions need loose, well-drained soil free of rocks and debris. Raised beds are ideal. Amend the soil with compost or other organic matter, such as Miracle-Gro® Organic Choice® Garden Soil"> before planting.
Feed Your Onions RegularlyApply a plant food that's high in phosphorus, such as Miracle-Gro® Liquid Quick Start® Plant Food, at the time of planting. Follow up with a complete plant food, such as Miracle-Gro® Water Soluble All Purpose Plant Food, every 2 weeks during the growing season. Water regularly, but don't flood the planting bed.
Harvest Your OnionsAbout 8 weeks after planting, scallion tops should be 6-8 inches tall and ready for picking. You can harvest green onions any time after the bulb has formed. Mature onions should be ready for harvest in mid- to late summer, when the green tops start to turn brown and fall over. Then simply pull the onions from the ground.
You can choose from two types of regular onions. Sweet onions are flavorful, mild tasting, and good raw in salads or cooked. However, they don't last long in storage. Storage onions will last as long as 4 months, but have a more pungent taste and are best cooked.
