Companion Planting for Tomatoes: Friends and Foes in the Garden

Companion planting pairs mutually beneficial crops. Tomatoes have strong preferences—some neighbors boost flavor and repel pests; others invite disease or stunt growth.

Best Tomato Companions

• Basil: Improves tomato flavor, repels insects; basil gets tastier too.
• Carrots: Boost tomato flavor/yield; carrots may be smaller.
• Chives, mint: Enhance flavor.
• Marigolds, onion, garlic: Scent deters pests.

Plants to Keep Away

• Corn: Shares tomato worms.
• Potatoes: Same family, same blight risk.
• Fennel: Stunts tomato plants.
• Black walnut trees: Release juglone—toxic to tomatoes. Never plant nearby.

Plan Before You Plant

Whether from seed or seedlings, map companions and existing trees/shrubs first. Smart pairings mean tastier tomatoes and fewer problems.