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Onion Spacing: How far apart to plant onions in the vegetable garden.

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Proper onion spacing is essential to promote healthy plant growth and high yields in a vegetable garden. Plant and row spacing depends on the type of onions you’re growing (green onions, small bulbs, or full-sized bulbs), as well as the planting technique (direct seeding, transplanting seedlings, or planting sets)

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Why is onion spacing important?  Proper plant spacing is essential when growing vegetables. Those planted too closely compete for water, sun, and nutrients, but planting too far apart wastes garden space and reduces yield. Tightly packed plants also limits air circulation which increases the risk of plant diseases. Plant seeds in rows 12 to 15 inches apart. Cover the seeds with 1/2 to 3/4 inch of soil. When the seedlings are 2 to 4 inches tall, thin the planting. For large, dry onions, plants should be spaced 2 to 3 inches apart after thinning.

3 ways to plant onions:  Onions grow best in a site with full sun and fertile, well-draining soil. Amend the bed with an inch of compost or rotted manure before planting. If your soil isn’t particularly fertile, you may wish to add a slow-release organic fertilizer when you prepare the garden bed. If planting onions in pots, choose a container or fabric planter that holds 7 to 10 gallons of potting mix and offers good drainage. 

Onion spacing when direct seeding: Sow the seeds a quarter of an inch deep and a half inch apart. When the young plants are several inches tall, thin them to 1 inch apart for green onions, 2 inches apart for small to medium-sized bulbs, or 4 to 6 inches apart for large bulb onions. Plant in a grid pattern or space rows 12 to 18 inches apart.

Onion spacing when planting seedings:  Set seedlings 1 inch apart for green onions, 2 inches apart for small to medium-sized bulbs, or 4 to 6 inches apart for large bulbs. Plant in a grid pattern or space rows 12 to 18 inches apart.

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