To plant onions properly, spacing depends on the type of onion and the desired bulb size:
- Onion sets (small dormant bulbs): Plant sets about 2 to 4 inches apart within rows, with rows spaced 12 to 18 inches apart. Plant sets 1 to 1.5 inches deep, with the pointed end up. This spacing allows sets to grow into mature bulbs without overcrowding
- Seedlings or transplants: Space seedlings 2 to 3 inches apart for dry onions (bulbing onions) and 1 inch apart if growing green onions. Rows should be 12 to 15 or up to 18 inches apart. Plant seedlings 1 to 1.5 inches deep
- Direct seeding: Sow seeds about 0.25 inches deep and thin to 2 inches apart for small to medium bulbs or 4 to 6 inches apart for large bulbs. Rows spaced 12 to 18 inches apart
- For green onions or scallions: Plants can be spaced closer, about 1 to 2 inches apart, with rows 6 to 8 inches apart
Spacing too close (e.g., less than 2 inches for bulbs) can reduce bulb size due to competition, while wider spacing allows larger bulbs and easier cultivation between rows
. In summary:
Onion Type| In-Row Spacing| Row Spacing| Planting Depth
---|---|---|---
Onion Sets| 2 to 4 inches| 12 to 18 inches| 1 to 1.5 inches deep
Seedlings| 2 to 3 inches| 12 to 15 inches| 1 to 1.5 inches deep
Large Bulb Onions| 4 to 6 inches| 12 to 18 inches| 0.25 inches (seeds)
Green Onions| 1 to 2 inches| 6 to 8 inches| 0.25 inches (seeds)
This spacing ensures healthy growth, good airflow, and optimal bulb development
