Best Companion Plants for Tomatoes: Natural Pest Control and Growth Partners

Companion planting uses nature's chemistry to protect tomatoes. The right neighbors repel pests, improve soil, and boost yields.

Top Tomato Companions

• Marigolds (secret weapon): Repel aphids, nematodes, tomato hornworms. Interplant between tomatoes. Crush into soil at season's end for nematode control. Save seeds from dried flowers.
• Alliums (onions, garlic, chives, shallots, scallions): Plant perimeter. Repel aphids. Many are perennial—plan placement.
• Asparagus: Mutualism! Tomatoes deter asparagus beetles; asparagus repels nematodes. Rotate tomatoes around permanent asparagus bed.
• Borage: Beautiful flowers repel hornworms. Attracts wasps (which eat hornworms). Sticky hairs trap insects. Tolerate wasps for this benefit.
• Herbs (basil, oregano): Repel whiteflies and spider mites.
• Carrots & spinach: Grow under/around tomatoes—different harvest times, compatible roots.
• Nasturtiums: Repel whiteflies and aphids.

Hornworm Alert

If you see stripped branches: hunt for large green caterpillars. Hand-pick and destroy—1-2 can defoliate a plant fast.

Plant Smart, Harvest More

Strategic companions create a resilient, productive tomato patch with fewer chemicals and less work.