How to Plant Onions
Start with your seeds. Transplant them into larger cells and before planting out, harden them off by putting the pots outside for several days.
In the garden, onion plants should be spaced 4 to 6 inches apart in the row, with rows 1 to 2 feet apart. Plant each one about 1/2 inch deep in a small hole.
After planting, trim the tops to about 4 inches. Onions need about 1 inch of water per week, so if the weather is dry, you’ll need to water them.
(source: www.finegardening.com)
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