Can You Plant Tomatoes With Lettuce?
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GardenSays
Tomatoes + lettuce: Yes — plant them together.
- Verdict
- Good companions
- Evidence
- Traditional
- Pairs rated
- 41
Lettuce bolts in summer heat — tomato plants cast exactly the afternoon shade that keeps it going longer, and shallow lettuce roots don't compete.
Layout: Plant lettuce on the east/north side of tomatoes where it gets morning sun and afternoon shade.
Why
- ✓This is long-standing garden practice; the mechanism is plausible but hasn't been formally tested.
- ✓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 × Lettuce: rated 'good' (traditional) 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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