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What to plant with basil and tomatoes comes down to choosing companions that boost growth, deter pests, and improve flavor in your garden.
This pairing is a classic in vegetable gardening because basil and tomatoes thrive together both in the kitchen and in the soil.
When you’re deciding what to plant with basil and tomatoes, you want to focus on plants that share similar sun, water, and nutrient needs.
In this post, we’ll explore the best companions for basil and tomatoes, the reasons these pairings work, and which plants to avoid.
Let’s dig into the perfect garden partners for your basil and tomatoes.
Why Basil and Tomatoes Are Perfect Companions
When you ask what to plant with basil and tomatoes, the answer starts with understanding why these two love each other so much.
Basil and tomatoes aren’t just a flavor match in pasta sauce; they’re a powerhouse duo in the garden.
Here’s what makes this combination so special:
1. Basil Repels Tomato Pests
One of the main reasons gardeners wonder what to plant with basil and tomatoes is pest control.
Basil’s strong aromatic oils naturally repel common tomato pests like aphids, spider mites, and tomato hornworms.
The scent of basil confuses these insects and masks the smell of the tomato plants.
This means healthier tomato plants with fewer pest problems.
When you plant basil near tomatoes, you’re creating a natural defense system that works around the clock.
2. Improved Flavor and Growth
Many gardeners swear that basil improves the flavor of tomatoes when planted nearby.
While science hasn’t fully confirmed this, the anecdotal evidence is strong and persistent.
What we do know is that basil and tomatoes have similar growing requirements.
Both love full sun, warm temperatures, and well-draining soil.
This makes them easy to care for together, which is part of why they’re such a beloved combination.
3. Space Efficiency and Soil Health
When you think about what to plant with basil and tomatoes, consider how they use space.
Basil grows low and bushy while tomatoes grow tall and upright.
This means they don’t compete for space or light.
Basil also acts as a living mulch, shading the soil and helping it retain moisture.
This benefits tomato roots and keeps the soil cooler during hot summer days.
Best Plants to Grow With Basil and Tomatoes
Now that you know why basil and tomatoes work so well together, let’s look at what to plant with basil and tomatoes to maximize your garden’s potential.
These companion plants add diversity and bring their own unique benefits to the mix.
Here are the top choices:
1. Marigolds
Marigolds are a must-have when deciding what to plant with basil and tomatoes.
Their bright flowers aren’t just pretty; they release chemicals from their roots that kill harmful nematodes in the soil.
They also repel whiteflies and other pests that love tomato plants.
Plant marigolds around the edge of your tomato and basil bed for a colorful, protective border.
The strong scent of marigolds is a big turn-off for many garden pests.
2. Carrots
Carrots are another great answer to what to plant with basil and tomatoes.
They grow underground, which means they don’t compete with tomato roots for space.
Carrots break up the soil as they grow, improving aeration for tomato roots.
Basil and carrots also share similar watering needs, making them easy companions.
Plus, carrots can help loosen compacted soil, benefiting the entire bed.
3. Onions and Garlic
Onions and garlic are fantastic when you’re thinking about what to plant with basil and tomatoes.
Their pungent smell repels aphids, spider mites, and other common tomato pests.
They also take up very little space, so you can tuck them between your tomato plants.
Garlic, in particular, has antifungal properties that can help protect tomatoes from disease.
These alliums are low-maintenance and won’t compete with basil or tomatoes for nutrients.
4. Lettuce and Spinach
Leafy greens like lettuce and spinach are excellent choices for what to plant with basil and tomatoes.
They grow quickly and can be harvested before the tomato plants get too large.
They also enjoy the partial shade that taller tomato plants provide later in the season.
This extends your harvest and makes efficient use of garden space.
Lettuce and spinach will appreciate the cooler soil that basil helps create.
5. Asparagus
Asparagus is a lesser-known but valuable companion when you’re asking what to plant with basil and tomatoes.
Tomatoes produce a natural chemical called solanine that repels asparagus beetles.
In return, asparagus can help deter tomato pests with its strong flavor compounds.
This is a long-term partnership that works well in larger gardens.
Just give asparagus plenty of space since it returns year after year.
Plants to Avoid With Basil and Tomatoes
Just as important as knowing what to plant with basil and tomatoes is knowing what to keep away from them.
Some plants compete for resources or attract pests that will harm your basil and tomatoes.
Here are the ones to skip:
1. Fennel
Fennel is one plant you should never put near your basil and tomatoes.
It releases chemicals that inhibit the growth of nearby plants.
This can stunt the growth of both basil and tomato plants.
Fennel also attracts pests that may move onto your tomatoes.
Keep fennel in a separate area of your garden, far away from your main beds.
2. Corn
Corn is another plant to avoid when you’re figuring out what to plant with basil and tomatoes.
Both corn and tomatoes are heavy feeders that compete for soil nutrients.
Corn also attracts the corn earworm, which can also damage tomato fruits.
The tall corn stalks can also shade your basil and tomatoes too much.
It’s best to keep these two crops separated.
3. Potatoes
Potatoes should never be planted with basil and tomatoes.
They’re both in the nightshade family and are susceptible to the same diseases.
This includes blight, which can spread quickly between the two crops.
Potatoes also compete heavily for potassium in the soil.
Keeping them apart is the best way to protect both crops.
4. Brassicas
Brassicas like cabbage, broccoli, and cauliflower are not good companions for basil and tomatoes.
They have different nutrient and watering needs that conflict with your main crops.
These vegetables also attract cabbage worms, which can sometimes move to other plants.
You’re better off planting brassicas in a separate bed altogether.
Tips for Planting Basil and Tomatoes Together
Now that you know what to plant with basil and tomatoes, it’s time to talk about how to do it right.
Proper planting techniques will ensure your companions all thrive together.
Here are some practical tips:
1. Give Them Enough Space
Space your tomato plants at least 18 to 24 inches apart.
Tuck basil plants between and around the tomatoes but don’t overcrowd them.
Basil needs good air circulation to prevent fungal diseases.
A good rule of thumb is to plant basil about 6 to 8 inches away from tomato stems.
2. Match Sun and Water Needs
All your companion plants should get at least six to eight hours of full sun daily.
Water deeply and consistently, but avoid overhead watering to prevent leaf diseases.
Drip irrigation or soaker hoses work best for basil and tomatoes.
Mulch around the base of plants to retain moisture and suppress weeds.
3. Rotate Your Crops
Don’t plant tomatoes or basil in the same spot year after year.
Rotate crops annually to prevent soil-borne diseases and nutrient depletion.
This also prevents pest populations from building up in the soil.
A simple three-year rotation plan works perfectly for a home garden.
So, What to Plant With Basil and Tomatoes?
What to plant with basil and tomatoes is all about choosing companions that support their growth and health.
Basil and tomatoes thrive together, and adding marigolds, carrots, onions, garlic, lettuce, and asparagus creates a diverse and productive garden.
Avoid fennel, corn, potatoes, and brassicas to keep your basil and tomatoes happy and thriving.
With the right companions, you’ll enjoy a bountiful harvest and a healthier garden all season long.
Happy planting with your basil and tomatoes.