Plant 14 inch deep when seeding onions for bulbs from October to December. Seeds should be spaced 1 inch apart. Thin the plants to one plant every 2 to 3 inches when they are about 6 inches tall. Green onions can be made from the leftover plants.
Here is how to plant onions
Preparing the soil
Garden soil should only be worked when it is dry enough to not stick to garden tools. Work the soil 8 to 10 inches deep before seeding or transplanting.
Remove all pebbles and garbage from the soil, then rake the soil smooth and break up any remaining clods.
Planting
Onions are a cool-season crop that can withstand temperatures well below zero degrees Fahrenheit. They can be grown from seeds, small bulbs known as sets, or transplants.
Seeding is the cheapest option, but it takes longer for onions to mature. Plant 14 inch deep when seeding onions for bulbs from October to December. Seeds should be spaced 1 inch apart. Thin the plants to one plant every 2 to 3 inches when they are about 6 inches tall. Green onions can be made from the leftover plants.
Fertilizing
Onions thrive when the garden soil is properly fertilized. Over a 100-square-foot garden space, spread 2 to 3 pounds of fertilizer like 10-10-10. Mix the fertilizer with the top 3 to 4 inches of soil after measuring and spreading it.
Watering
In the spring, watering once a week is usually sufficient. During dry, windy weather, though, you may need to water more frequently. To help onions produce strong, healthy roots, water them slowly and deeply.
