Can You Plant Tomatoes With Marigold?
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GardenSays
tomatoes + marigold: Yes — plant them together.
- Verdict
- Good companions
- Evidence tier
- Strong evidence
- 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.
Calculated result · 2 verified sources · Checked 2026-07-15 · How we decide
Why
Layout: Edge the bed with French marigolds, or grow them as a cover in the bed the season before tomatoes.
- Mechanism is supported in extension or peer-reviewed research.
- 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 companionsSource guidance
Tomato × Marigold: rated 'good' in the GardenSays pairing table.
- 2. Strong evidenceSource guidance
Mechanism is supported in extension or peer-reviewed research.
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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People also ask
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How far apart should tomatoes be planted?
Your 8×4 ft raised bed fits 8 tomatoes at 21-inch spacing. Calculate yours →
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