Companion plants for onions
We haven't found reliable sources for onion companion pairings yet, so we don't list any. The growing basics below are still sourced.
Growing onion
Allium cepa
- Sun
- Full sun
- Water
- Steady moisture; reduce as bulbs mature
- Soil
- Loose, well-drained soil
- Spacing
- Space to cultivar guidance for bulb size
Good companions for onions
No sourced companion pairings for onion yet.
Use caution
No sourced conflicts recorded.
Other crops
Check pairings in your own beds
Smart Garden Planner flags companions and conflicts as you add onions and other plants to a garden bed.
Reference version 2026-11-03. Educational information; local conditions vary — check your local extension office.