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How Far Apart Do You Plant Onions? [Planting Guide]

A wrong choice in choosing a variety and spacing might be the reason for no bulb during the harvest, as the Onions plant should be at least a few inches apart.

Generally, the thumb rule for Onions planting is 5cm (2 inches) apart for green Onions, 3-4 inches for medium-sized bulbs, and 4-5 inches for full-size bulbs, with the row gap maintained at 3-5 inches apart.

Remember that the spacing for the Onion plant depends upon the purpose and area inside your home. Scroll down to know in detail.

What is the Best Time to Plant Onions?

Although the bulbous Onion is native to southwestern Asia, featuring dry arid climates, they prefer temperate conditions for growth and bulb formation. 

So the best time to plant Onions is during the late winter or early spring, allowing the Onion seeds, sets or transplants 3 to 4 months for the growth.
Onions can take anywhere between 90 and 100 days to grow and mature.

However, the planting time may vary depending on the variety you choose for Onions, as three different types of Onions depend upon a certain amount of sunlight.

  • Short Day Onion: Grown in the south at a 35ºlatitude during the fall or early winter, the Onions require at least 10 to 12 hours of light.
  • Intermediate Day Onion: These Onions require at least 12 to 14 hours of sunlight, possible only if sown in mid-fall to early spring.
  • Long Day Onion: Many are native to the northern area with a demand of 14 to 16 hours of sunlight, possible only if sown 10-12 weeks before the last frost hits.

How Far Apart Do You Plant Onions?

After choosing the variety, you can plant Onions in your garden (outdoors) or indoors in a container, but before that, understand the gap to be maintained.

Onions prefer loamy soil with lots of organic matter and direct sunlight. But if the bulbs are crowded, all the factors go into vain since they will compete for food and light.
A container with dried plants of onions grown at a certain distance apart.
A five-gallon container can support about 6 to 8 Onion plants.

Such unhealthy competition results in smaller or no bulbs at all. So to make your cultivation worthy, know the optimum distance required by Onions.

Germination MediaContainerGarden
Seeds1 inches apart for greens

2 inches apart for small to medium bulb

4 to 6 inches apart for large bulbs
2 to 4 inches apart in a 12 to 15 inches apart row
Sets1 inches deep nad 2 inches apart for small bulbs

4 to 5 inches apart for large bulbs
3 to 4 inches apart
Transplants2 to 3 inches apart6 inches apart with 12 to 18 inches between rows

Take reference from the video for a visual aid!

From Editorial Team


If you want Onions and greens for salad, choose the seeding method and follow the transplanting method if your goal is large bulbs.

Follow the spacing and choose the variety per your location to increase the yield and minimize the risk of pest and disease infestation by utilizing the garden space to its fullest.