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What to plant with basil and tomatoes is a question every gardener asks, and the answer is more exciting than you might think.
When you’re figuring out what to plant with basil and tomatoes, you’re actually building a dream team of plants that support each other, repel pests, and boost flavor.
It’s not just about saving space, it’s about creating a tiny ecosystem where your tomatoes grow bigger and your basil gets bushier than ever.
In this post, we’ll explore the best companions, the science behind why they work, and a few plants you should absolutely avoid.
Let’s dig into the perfect garden partnerships.
Why You Should Plant Basil With Tomatoes
The classic pairing of basil and tomatoes goes far beyond the kitchen, because these two are powerhouse garden allies.
When you plant basil with tomatoes, you’re using natural chemistry to protect your crop and improve its taste.
Here’s why this combination is a no-brainer.
1. Basil Repels Tomato Pests Naturally
The strong aromatic oils in basil are a natural bug repellent that confuses and deters common tomato pests.
If you’re wondering what to plant with basil and tomatoes for pest control, basil is the number one answer.
It masks the scent of your tomato plants, making it harder for hornworms, aphids, and whiteflies to find them.
This means fewer damaged leaves and more fruit making it to your table.
You’ll notice the difference almost immediately when basil is planted nearby.
2. Basil Improves Tomato Flavor and Growth
Many gardeners swear that basil makes tomatoes taste sweeter and more vibrant.
While science hasn’t fully proven this, the theory is that basil’s essential oils mingle with the tomato plant’s growth hormones.
Plus, basil is a shallow-rooted plant that doesn’t compete with tomatoes for deep soil nutrients.
This allows both plants to thrive side by side without fighting for resources.
When you plant basil with tomatoes, you’re also getting a natural mulch that shades the soil.
3. Basil Attracts Pollinators and Beneficial Insects
Basil produces tiny white flowers that are irresistible to bees and other pollinators.
More pollinators around your garden means better fruit set on your tomato plants.
Also, these flowers attract predatory wasps that feed on tomato hornworms.
So, when you plant basil with tomatoes, you’re inviting a tiny army of helpers to your garden.
This is one of the easiest ways to boost your yield without any chemicals.
Other Perfect Companions To Plant With Basil And Tomatoes
When you think about what to plant with basil and tomatoes, don’t stop at just those two plants.
A diverse garden is a healthy garden, and there are several other veggies and herbs that love this trio.
These companions help each other out in surprising ways.
1. Marigolds Are the Ultimate Bodyguards
Marigolds are the most famous companion for tomatoes, and they pair perfectly with basil too.
If you’re wondering what to plant with basil and tomatoes to fight nematodes, marigolds are your answer.
Their roots release a chemical that kills harmful soil nematodes.
Plus, their bright flowers attract hoverflies that feast on aphids.
Plant a border of marigolds around your tomato and basil bed for maximum protection.
2. Carrots Loosen the Soil For Tomato Roots
Carrots are another great answer to what to plant with basil and tomatoes.
They grow deep into the soil, breaking it up and improving drainage for your tomatoes.
Basil doesn’t mind the competition since carrots don’t take up much surface space.
Carrots also benefit from basil’s pest-repelling properties.
It’s a win-win when you interplant these three together.
3. Onions and Garlic Deter Underground Pests
Onions and garlic are fantastic to plant with basil and tomatoes because of their strong smells.
They repel aphids, spider mites, and even rabbits from your garden.
These alliums don’t take up much room, so you can tuck them between your tomato plants.
Their pungent aroma confuses pests that locate plants by scent alone.
Basil, tomatoes, onions, and garlic create a powerful aromatic barrier.
4. Asparagus is a Long-Term Friend
Asparagus is a perennial that pairs wonderfully with tomatoes and basil.
It produces a chemical that repels nematodes, just like marigolds.
In return, tomatoes release a substance that protects asparagus from asparagus beetles.
This is a beautiful symbiotic relationship that benefits everyone.
If you have the space, this is a top choice for what to plant with basil and tomatoes.
Herbs And Flowers That Boost The Trio
To really dial in your garden, you should consider adding more herbs and flowers.
These don’t just look pretty, they actively work to keep your plants thriving.
Here are some of my favorite additions.
1. Oregano is a Ground Cover Champion
Oregano is a low-growing herb that loves the same sunny conditions as tomatoes.
It acts as a living mulch, keeping the soil cool and moist.
Oregano also attracts beneficial insects while repelling cabbage moths.
This makes it an excellent answer to what to plant with basil and tomatoes for ground coverage.
Plus, you can use all three herbs together in your cooking.
2. Borage Deters Hornworms and Boosts Immunity
Borage is a star flower that you should absolutely consider.
It repels tomato hornworms incredibly well, and it’s so easy to grow.
As a bonus, borage adds calcium and potassium to the soil, which tomatoes love.
The blue flowers are gorgeous and attract pollinators all season long.
If you’re looking for what to plant with basil and tomatoes, borage it is.
3. Parsley is a Hardy Companion
Parsley is another herb that enjoys the same conditions as tomatoes.
It grows well in partial shade, so it can fill in the gaps around your tomato plants.
Parsley attracts hoverflies which eat aphids, protecting your new growth.
It also serves as a trap plant for some pests, keeping them off your tomatoes.
This is a simple, functional addition to your companion planting plan.
4. Chives and Their Onion-Like Magic
Chives are in the allium family and offer similar benefits to onions.
They repel Japanese beetles and carrot flies, adding another layer of defense.
Chives also help prevent tomato leaf curl and other fungal issues.
Their purple flowers are pretty and also edible.
Planting chives alongside your tomatoes and basil is always a smart move.
Plants To Avoid With Basil And Tomatoes
Knowing what to plant with basil and tomatoes is only half the battle, you also need to know what to avoid.
Some plants are just bad neighbors and will cause more harm than good.
Avoid these if you want a healthy, productive garden.
1. Keep Fennel Far Away
Fennel is a notorious garden bully that you should never plant near tomatoes.
It releases chemicals that inhibit the growth of tomatoes and basil.
Fennel also attracts pests that can infest your tomato plants.
If you want to grow fennel, put it in a completely different part of the garden.
This is the biggest mistake you can make in companion planting.
2. Avoid Cabbage and Its Cousins
Broccoli, cabbage, and cauliflower don’t mix well with tomatoes.
They compete heavily for the same nutrients, especially nitrogen.
These brassicas also attract the same pests that will attack your tomatoes.
Cramming them together can stunt the growth of both plants.
Keep your brassicas in a separate bed to enjoy better yields.
3. Don’t Plant Corn or Potatoes Nearby
Corn attracts tomato fruit worms, which will easily move onto your tomatoes.
Potatoes and tomatoes are both in the nightshade family and share common diseases.
If you plant them together, blight can spread between them very quickly.
This can devastate your whole harvest in a matter of weeks.
Keep these heavy hitters in separate zones to be safe.
So, What To Plant With Basil And Tomatoes?
What to plant with basil and tomatoes comes down to supporting your main crops with beneficial friends.
You can plant marigolds, carrots, onions, and oregano right beside them for excellent results.
These plants will help repel pests, improve soil health, and even boost flavor.
On the flip side, always avoid fennel, cabbage, and potatoes in that same bed.
With this knowledge, you’re ready to create a thriving, biodiverse garden full of healthy vegetables.
Happy planting, and here’s to your best tomato harvest yet!