Can You Plant Tomatoes With Marigold?
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GardenSays
Tomatoes + marigold: Yes — plant them together.
- Verdict
- Good companions
- Evidence
- Documented
- Pairs rated
- 41
French marigolds (Tagetes patula) suppress root-knot nematodes in soil — one of the few companion effects with solid research behind it. The effect works through root exudates, strongest when marigolds grow in the spot beforehand.
Layout: Edge the bed with French marigolds, or grow them as a cover in the bed the season before tomatoes.
Why
- ✓This pairing's mechanism is supported in extension or research literature.
- ✓Companion planting tweaks the odds — spacing, rotation, and airflow still matter more than any pairing.
When this doesn't apply
- →If either plant has had disease problems in this spot before, rotation history outweighs the pairing benefit.
How this was calculated
- 1. Pairing lookupGood companions
Tomato × Marigold: rated 'good' (documented) in the GardenSays pairing table.
- 2. Evidence standard
Confidence labels: 'documented' = mechanism supported in extension/research literature; 'traditional' = long-standing practice with plausible mechanism but thin formal evidence.
Data sources
- University of Minnesota Extension — Companion planting in home gardens — Some companion effects (trap crops, pollinator attraction, nematode suppression by marigolds) are documented; many traditional pairings lack formal evidence. (checked 2026-07-15)
- University of Minnesota Extension — Growing tomatoes in home gardens — Avoid planting tomatoes near potatoes (shared blight) or where related crops grew the previous year. (checked 2026-07-15)
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