How Deep Do You Plant Bulb Onions

Bulb onions require early, shallow planting for proper development.

Onions grow well in the home garden when planted as seeds or transplants, according to Oregon State University Extension. The depth of planting depends on whether you plant seeds or transplants and whether you want to harvest your onions as bulbs or scallions.

Seeds

You should plant bulb onions seeds about 1/2 inch deep, according to Oregon State University Extension. Seeds establish well if you ensure adequate moisture for germination.

Scallions

Transplants should be set in the ground at 1 1/2 to 2 inches in depth to grow scallions or green onions. Use larger transplants to harvest your scallions as soon as possible.

Bulbs

Plant transplants about 1/2 inch deep if you plan on letting them develop into onion bulbs. You should also plant them at least 3 inches apart to ensure adequate growing space under ground.

References

• Oregon State University Extension: Plant Onions in Early Spring for Biggest Bulbs

Resources

• Ohio State University Extension: Growing Onions in the Home Garden