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What to plant with tomatoes and basil comes down to choosing companions that boost growth, deter pests, and make the most of your garden space.
Tomatoes and basil are already a classic pairing in the kitchen, and they’re just as legendary in the garden bed.
When you know what to plant with tomatoes and basil, you can create a thriving, productive patch that practically takes care of itself.
In this post, we’ll explore the best companions for these two stars, why they work so well together, and a few plants you should keep far away.
Let’s dig into the perfect garden lineup for your tomatoes and basil.
Why Tomatoes and Basil Thrive Together
Tomatoes and basil are more than just culinary soulmates—they’re garden allies that support each other in several key ways.
When you plant basil near tomatoes, the basil helps repel common pests like aphids, spider mites, and tomato hornworms.
Basil’s strong, aromatic scent confuses these insects, making it harder for them to locate your precious tomato plants.
In return, tomatoes provide a bit of dappled shade for basil during the hottest part of the day, which basil appreciates in warm climates.
So when planning what to plant with tomatoes and basil, you’re already off to a fantastic start with this power duo.
1. Basil Improves Tomato Flavor and Growth
Many gardeners swear that basil makes tomatoes taste even better, and there’s some science behind the anecdote.
Basil releases volatile oils into the air that can subtly influence the growth and flavor profile of nearby tomato plants.
This companion relationship also encourages more vigorous tomato growth, as the two plants don’t compete for the same nutrients aggressively.
Basil is a light feeder, while tomatoes are heavy feeders, so they complement each other’s root activity rather than clash.
Adding basil to your tomato patch is a simple and effective way to boost overall plant health and harvest quality.
2. They Share Similar Growing Needs
Tomatoes and basil both love full sun, warm soil, and consistent moisture, which makes them easy to grow together.
They thrive in the same type of well-draining soil with a slightly acidic to neutral pH around 6.0 to 7.0.
Watering needs are similar too—both prefer deep, infrequent watering rather than shallow sprinkles every day.
This alignment means you can water, fertilize, and mulch them with the same routine, saving time and effort.
When you’re deciding what to plant with tomatoes and basil, their shared preferences make them a no-brainer pair.
Top Companion Plants for Tomatoes and Basil
Now that you know why this duo works, let’s explore the best additions to create a robust and diverse garden bed.
Adding more companions can improve pollination, attract beneficial insects, and maximize every square foot of space.
Here are my favorite plants to include when considering what to plant with tomatoes and basil.
1. Marigolds: The Pest-Fighting Beauties
Marigolds are the ultimate workhorse companion for tomatoes and basil.
Their bright blooms add a pop of color while releasing a scent that deters nematodes, whiteflies, and other soil pests.
Plant marigolds around the perimeter of your tomato bed to create a natural barrier that pests don’t want to cross.
French marigolds are especially effective, as their roots produce compounds that suppress harmful root-knot nematodes.
If you’re wondering what to plant with tomatoes and basil, marigolds should be at the top of your list.
2. Carrots: Underground Allies
Carrots are another fantastic companion because they use space efficiently and don’t compete with tomatoes for sunlight.
Tomatoes and basil grow upward and bushy, while carrots stay low and dig deep into the soil.
This vertical and horizontal space-sharing means you can grow more food in the same bed without crowding.
Carrots also help loosen the soil as they grow, which benefits the shallow roots of basil and the deeper roots of tomatoes.
Add carrots to your garden plan when thinking about what to plant with tomatoes and basil for a fuller harvest.
3. Onions and Garlic: The Aromatic Protectors
Onions and garlic are excellent companions that repel a wide range of insects, including aphids and spider mites.
Their pungent smell masks the attractive aroma of tomatoes, making it harder for pests to find their target.
Plant them in between tomato and basil plants to create a living, aromatic defense system.
These alliums also improve soil health by adding sulfur compounds that can deter fungal diseases.
Including onions or garlic is a smart answer to what to plant with tomatoes and basil for natural pest control.
4. Lettuce and Spinach: Quick-Growing Fillers
Leafy greens like lettuce and spinach are perfect for filling gaps between tomato and basil plants early in the season.
They grow quickly and can be harvested before tomatoes get large and start shading the ground.
Their shallow roots won’t disturb tomatoes, and they appreciate the slight shade that tomato leaves provide later on.
This extends your growing season, as you can plant lettuce in the cool spring and harvest it by early summer.
So if you’re planning what to plant with tomatoes and basil, don’t overlook these fast and easy greens.
5. Borage: The Flower That Brings Bees
Borage is a lesser-known but incredible companion that attracts pollinators like bees and wasps to your garden.
These beneficial insects help pollinate tomato flowers, leading to fruit set and bigger yields.
Borage also repels tomato hornworms, which can be one of the most destructive tomato pests out there.
Its pretty blue flowers and hairy leaves add texture and beauty to the garden bed.
This plant is a great addition when you’re researching what to plant with tomatoes and basil.
What Not to Plant With Tomatoes and Basil
Just as some plants help, others can hinder the growth of your tomatoes and basil.
Knowing what to avoid is just as important as knowing what to plant with tomatoes and basil.
1. Keep Brassicas Away
Cabbage, broccoli, and cauliflower compete with tomatoes for nutrients and can stunt their growth.
Brassicas also attract pests like flea beetles and cabbage worms that can spread to your tomatoes.
It’s best to give these heavy-feeding vegetables their own separate bed.
2. Avoid Fennel
Fennel is notorious for inhibiting the growth of many garden plants, including tomatoes and basil.
It releases chemicals into the soil that suppress the growth of nearby plants.
Keep fennel far away from your tomato and basil patch to avoid poor yields.
3. Skip Potatoes
Tomatoes and potatoes are both members of the nightshade family and share the same diseases.
This makes them prone to blight and other fungal issues that can spread rapidly between them.
Avoid planting potatoes near tomatoes to protect your harvest.
So, What to Plant With Tomatoes and Basil?
What to plant with tomatoes and basil boils down to choosing companions that complement their growth and protect them from pests.
Marigolds, carrots, onions, garlic, lettuce, spinach, and borage are all excellent choices that enhance your garden’s health and productivity.
On the flip side, avoid brassicas, fennel, and potatoes to prevent competition and disease spread.
So start with tomatoes and basil as your core, then layer in these companions to create a balanced, thriving ecosystem.
With the right plant partners, your garden will be more resilient, productive, and beautiful all season long.