There is nothing quite like the taste of a sun-ripened tomato straight from the garden. But getting that perfect harvest takes more than just planting a seedling and hoping for the best. One of the smartest strategies for healthier, more productive tomato plants is companion planting. By growing certain plants nearby, you can naturally deter pests, improve soil health, and even enhance the flavor of your tomatoes .
That is what makes knowing the best companion plants for tomatoes so valuable for American gardeners, letting you grow bigger, better-tasting tomatoes without relying on chemicals.
This article covers seven of the best companion plants for tomatoes. Every suggestion includes specific benefits, growing tips, and practical advice. No vague recommendations. No complicated techniques. Just proven companion plants that help your tomatoes thrive.
Table of Contents
Why Companion Planting Works for Tomatoes
Companion planting is the practice of growing different plants together for mutual benefit . Some plants release chemicals that repel harmful insects, while others attract beneficial pollinators or help balance nutrients in the soil . Tomatoes are heavy feeders that benefit greatly from the right plant neighbors.
The benefits of companion planting for tomatoes are significant. The right companions can repel pests like aphids, whiteflies, and hornworms, reducing the need for chemical pesticides . Some companions improve soil health by adding nutrients or loosening the soil . Others attract pollinators and beneficial insects that help your tomatoes thrive .
According to the Royal Horticultural Society, companion plants can also “give added health to their neighbours,” with some herbs like parsley giving “increased vigour to tomatoes” . The wrong companions, however, can stunt growth or attract pests, so choosing wisely is essential .
1. Basil: The Classic Kitchen Companion
✦ Best for: Repelling pests and potentially enhancing tomato flavor
Basil is the most famous companion plant for tomatoes, and for good reason. This fragrant herb is believed to enhance the flavor of tomatoes when grown nearby . Some studies even suggest that tomatoes grown alongside basil produce more fruit . Beyond flavor, basil emits strong aromatic oils that mask the scent of tomato plants, deterring pests like aphids, whiteflies, and tomato hornworms .
Plant basil 12 to 18 inches from your tomato plants in full sun with moist, well-draining soil . In addition to its garden benefits, you will have fresh basil on hand for caprese salads and homemade pasta sauce all summer long .
2. Marigolds: The Pest-Repelling Flower
✦ Best for: Deterring nematodes, whiteflies, and aphids
Marigolds are another powerhouse companion plant for tomatoes. Their strong scent naturally deters harmful insects, including aphids, whiteflies, and nematodes . French marigolds, in particular, contain the chemical limonene, which repels whiteflies that often plague tomato plants .
Marigolds also attract beneficial insects that prey on pests, leading to healthier and more resilient tomato plants . Plant them around the base of your tomatoes in full sun with well-draining soil. Their bright blooms add beauty to your garden while providing essential protection .
3. Garlic and Onions: The Pungent Protectors
✦ Best for: Repelling aphids, spider mites, and other insects with their strong scent
Garlic and onions are excellent companions for tomatoes, thanks to their pungent scents that naturally repel pests . Garlic releases sulfur compounds that act as a natural insect repellent, helping to protect tomato plants from red spider mites and aphids . Onions deter aphids, thrips, and flea beetles, making them ideal for interplanting in small garden beds .
Garlic also has anti-fungal properties that may help reduce the risk of certain plant diseases in your garden . Plant garlic and onions near your tomatoes in full sun with well-draining soil. Because they don’t compete heavily with tomatoes for nutrients, they make great space-filling companions .
4. Carrots: The Soil Loosener
✦ Best for: Loosening soil around tomato roots and maximizing garden space
Carrots are a smart, practical companion for tomatoes . Because they grow underground, they help break up the soil around tomato roots, making it easier for them to spread out and access water and nutrients . They also thrive in the partial shade provided by taller tomato plants, making them an excellent interplanting choice .
Carrots don’t compete heavily with tomatoes for nutrients and can be planted in between tomato rows to maximize garden space . This “interplanting” approach is one of the most efficient ways to make the most of your garden . Carrots also give back to the soil by loosening it with their taproots, which benefits your tomato plants .
5. Borage: The Pollinator Magnet
✦ Best for: Attracting bees and deterring tomato hornworms
Borage is a beautiful blue-flowered herb that is an excellent companion for tomatoes. It deters tomato hornworms and attracts bees, which leads to more pollination on your tomato plants and a larger crop . Borage also improves soil by accumulating trace minerals and adding them back to the earth .
This plant contains chemicals that naturally keep hornworms and cabbageworms away from tomato plants . In addition to its pest-repelling properties, borage attracts parasitic wasps that prey on tomato pests . Plant borage in full sun with well-draining soil, and enjoy its beautiful star-shaped blooms while your tomatoes thrive.
6. Chives: The Subtle Protector
✦ Best for: Repelling aphids and attracting pollinators
Chives are a fantastic companion for tomatoes, offering multiple benefits in a compact package. They repel aphids, spiders, and mites that can damage the growth and fruiting of tomatoes . When chives flower, they also attract bumblebees, which help with the pollination of tomato flowers .
The sulfurous compounds in chives create a pungent scent that deters soft-bodied insects like aphids . Chives have a light, onion-like aroma that does a superb job at repelling aphids, mites, and nematodes . They are easy to grow alongside tomatoes in containers or garden beds .
7. Nasturtiums: The Trap Crop
✦ Best for: Attracting pests away from tomatoes and protecting the soil
Nasturtiums are a colorful and effective companion plant for tomatoes. They act as a natural trap crop, luring pests like aphids and whiteflies away from your tomatoes . Their large, circular leaves spread across the topsoil like a blanket, helping keep the soil from drying out and keeping tomato roots nice and cool .
Nasturtiums also deter whiteflies and squash bugs, making them an essential companion for any tomato garden . Their bright reddish-orange and yellow flowers add beauty to the garden while providing protection . Plant nasturtiums in full sun with well-draining soil, and enjoy their vibrant blooms while they protect your precious tomato plants .
Quick Tips for Successful Companion Planting
Give plants space: Companion plants can be planted 4 to 6 inches from tomato plants without interfering with their root systems . Avoid overcrowding, which can prevent plants from growing properly and lead to competition for resources .
Consider the shade: Plants like lettuce and spinach that grow low to the ground can act as living mulch, suppressing weeds and retaining soil moisture under tomato plants .
Rotate your plants: Change the placement of where you plant each season to prevent nutrient depletion and reduce pests and diseases . This simple practice keeps your soil healthy and your plants thriving.
Monitor your plants: Check on your garden occasionally to detect any potential pest or disease issues early . Regular monitoring helps maintain a healthy and productive garden.
Frequently Asked Questions About Companion Plants for Tomatoes
What are the best companion plants for tomatoes?
The best companion plants for tomatoes include basil, marigolds, garlic, onions, carrots, borage, chives, and nasturtiums. These plants help repel pests, improve soil health, and enhance tomato growth . Basil is particularly effective at repelling aphids and whiteflies, while marigolds deter nematodes .
What should you not plant near tomatoes?
Avoid planting tomatoes near cabbage, broccoli, cauliflower, and other brassicas, as they compete for nutrients and can slow tomato growth . Fennel inhibits the growth of tomatoes and should be kept far away . Potatoes are in the same family as tomatoes and are vulnerable to the same diseases, like blight . Corn attracts tomato fruitworms, making it a poor choice for a companion .
Do companion plants really improve tomato flavor?
Many gardeners and experts believe that certain companion plants, particularly basil, can enhance the flavor of tomatoes . While scientific evidence is limited, the practice is widely supported by gardeners based on observation. Some studies suggest that tomatoes grown alongside basil produce more fruit, which is a valuable benefit in itself .
How close should companion plants be to tomatoes?
Companion plants can be planted 4 to 6 inches from tomato plants without interfering with their root systems . For smaller plants like basil and chives, this spacing allows them to benefit from each other while giving tomatoes enough room to grow. Always follow spacing recommendations on seed packets for each plant .
Can I grow companion plants in containers with tomatoes?
Yes, many companion plants grow well in containers alongside tomatoes. Basil, chives, and marigolds are particularly well-suited for container planting . Just make sure the container is large enough to accommodate both plants and that there is good air circulation between them to prevent fungal diseases .
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The right neighbors make all the difference. Plant these companion plants for tomatoes and watch your harvest grow bigger, healthier, and more flavorful every season.