Companion Planting: Scallion (Green Onion)
Allium fistulosum
Spacing: 9 per square foot. Mature height: 1-1.5 ft.
Plant these nearby
- Carrot: Same allium/carrot pest-masking effect measured for onion and carrot (Uvah & Coaker 1984) — a real, peer-reviewed field study, not folklore. The reverse direction (carrot masking onion from onion fly) wasn't part of that study and is the less-supported half of this pairing. (source)
- Lettuce: Space-efficient interplant with non-competing root depths.
Keep these apart
- Bush Beans: Alliums are traditionally kept off legume beds on the theory that they inhibit nitrogen-fixing bacteria, but WSU Extension's review of companion-planting research found no scientific basis for that specific mechanism — treat this as garden tradition, not measured evidence. (source)
- Pea: Alliums are traditionally kept off legume beds on the theory that they inhibit nitrogen-fixing bacteria, but WSU Extension's review of companion-planting research found no scientific basis for that specific mechanism — treat this as garden tradition, not measured evidence. (source)
Common pairings, answered directly
- Can I plant scallion (green onion) next to carrot?
- Yes. Same allium/carrot pest-masking effect measured for onion and carrot (Uvah & Coaker 1984) — a real, peer-reviewed field study, not folklore. The reverse direction (carrot masking onion from onion fly) wasn't part of that study and is the less-supported half of this pairing.
- Can I plant scallion (green onion) next to lettuce?
- Yes. Space-efficient interplant with non-competing root depths.
- Can I plant scallion (green onion) next to bush beans?
- Better not to. Alliums are traditionally kept off legume beds on the theory that they inhibit nitrogen-fixing bacteria, but WSU Extension's review of companion-planting research found no scientific basis for that specific mechanism — treat this as garden tradition, not measured evidence.
- Can I plant scallion (green onion) next to pea?
- Better not to. Alliums are traditionally kept off legume beds on the theory that they inhibit nitrogen-fixing bacteria, but WSU Extension's review of companion-planting research found no scientific basis for that specific mechanism — treat this as garden tradition, not measured evidence.
Lay this out in the Garden Designer →
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Companion planting for Scallion (Green Onion): which plants to grow next to it, which to keep apart, and the reason behind each pairing.
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