What to Plant Next to Tomatoes in a Raised Bed

Discover the best companion plants for tomatoes in raised beds — and which plants to avoid for a healthier, more productive garden.

Tomatoes are one of the most popular vegetables in home gardens — but they grow best when paired with the right neighbors. Companion planting in raised beds can help repel pests, improve flavor, and maximize your growing space.

Best Companions for Tomatoes

Basil 🌿

Basil is the classic tomato companion. It is believed to repel aphids, whiteflies, and tomato hornworms. Many gardeners also claim that basil improves the flavor of nearby tomatoes. Plant basil 30–45 cm away from your tomato plants.

Marigolds 🌼

Marigolds are one of the most powerful pest-deterrent plants you can grow. Their scent confuses and repels many insects, including nematodes in the soil. Plant them around the border of your raised bed.

Carrots 🥕

Carrots and tomatoes are good neighbors. Carrots loosen the soil around tomato roots, improving drainage and aeration. They also take up very little horizontal space, making them ideal for raised beds.

Parsley

Parsley attracts beneficial insects like predatory wasps that feed on common tomato pests. It also grows well in the partial shade created by tomato plants.

Garlic 🧄

Garlic is a natural pest repellent. Planting it near tomatoes can help deter spider mites and aphids.

What NOT to Plant Next to Tomatoes

Avoid planting these near your tomatoes:

  • Fennel — releases compounds that stunt tomato growth
  • Brassicas (cabbage, broccoli, kale) — compete heavily for nutrients
  • Corn — attracts the same pests as tomatoes, doubling your problem
  • Potatoes — share diseases like blight with tomatoes

Raised Bed Layout Tips

When planning your raised bed, keep these spacing tips in mind:

  1. Place tall tomato plants on the north side so they don’t shade shorter companions
  2. Use marigolds as a border all around the bed
  3. Tuck basil and parsley between tomato plants
  4. Leave at least 45–60 cm between tomato plants for airflow

Final Thoughts

Companion planting is one of the easiest ways to improve your raised bed garden naturally. Start with basil and marigolds next to your tomatoes — you will notice the difference by midsummer.