Can You Plant Tomatoes With Leeks?

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. 1. Pairing lookupGood companions

   Tomato × Leeks: rated 'good' (traditional) in the GardenSays pairing table.

2. 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)