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What to plant with Thai basil comes down to choosing companions that share its love for warm weather, moist soil, and full sun.
Thai basil is a gorgeous, aromatic herb that thrives in garden beds, raised boxes, and containers alike.
And when you plant what to plant with Thai basil thoughtfully, you create a miniature ecosystem that boosts flavor, repels pests, and maximizes your harvest space.
In this post, I’ll share the best partners for Thai basil, why certain plants work so well together, and a few combinations you should definitely avoid.
Let’s dig in.
Why Companion Planting Matters When Deciding What To Plant With Thai Basil
Understanding what to plant with Thai basil starts with knowing how this herb behaves in the garden.
Thai basil releases a strong, spicy-sweet aroma that naturally confuses and repels many common garden pests.
So when you plant Thai basil near vulnerable crops, you give those plants a living shield.
At the same time, Thai basil benefits from neighbors that provide light shade during scorching afternoons or that attract pollinators to help it flower.
It’s all about balance, and choosing what to plant with Thai basil carefully means less work for you and healthier plants all around.
1. Thai Basil and Tomatoes Are a Classic Pairing
Tomatoes are one of the best answers to the question of what to plant with Thai basil.
They both crave full sun and consistent moisture, so their watering schedules match perfectly.
Thai basil’s strong scent helps mask the odor of tomato plants, which can attract hornworms and whiteflies.
Tomatoes, in turn, grow tall and can offer Thai basil gentle afternoon shade in hotter climates.
Plant Thai basil at the base of your tomato cages and you’ll get a living mulch that keeps soil cool and moist.
Plus, harvesting Thai basil and tomatoes together for a stir-fry or salad is pure garden joy.
2. Peppers Love Sharing Space With Thai Basil
When thinking about what to plant with Thai basil, peppers should be high on your list.
Bell peppers, jalapeños, and Thai chilies all thrive in the same hot, sunny conditions that Thai basil adores.
Thai basil’s aromatic leaves deter aphids, spider mites, and thrips that often trouble pepper plants.
In return, peppers provide a bit of structural support and don’t compete aggressively for root space.
This dynamic duo also looks stunning together in a container garden.
You can tuck Thai basil around pepper plants in a large pot and enjoy a compact, productive arrangement.
3. Leafy Greens Are Great Companions for Thai Basil
If you’re wondering what to plant with Thai basil in cooler parts of the season, leafy greens are a smart choice.
Lettuce, spinach, arugula, and Swiss chard appreciate the light shade that Thai basil provides as it grows taller.
These greens also have shallow roots, so they won’t fight with Thai basil for nutrients deeper in the soil.
Plant leafy greens on the eastern side of your Thai basil so they catch morning sun and avoid the harshest afternoon heat.
This companion combo lets you harvest salads and fresh herbs from the same patch all season long.
4. Root Vegetables Work Well With Thai Basil
Carrots, radishes, and beets make surprisingly good neighbors when you’re deciding what to plant with Thai basil.
Because root veggies grow underground, they don’t compete for above-ground space or sunlight.
Thai basil’s scent confuses root maggot flies and other pests that might lay eggs near the soil surface.
Radishes, in particular, mature quickly and can be pulled before Thai basil hits its full stride.
This overlap in timing means you maximize every square inch of your bed without crowding.
Just leave enough space between rows so the root crops get ample sunlight to fuel their growth below.
Other Great Options For What To Plant With Thai Basil
Beyond the big hitters, there are several other herbs and flowers that make excellent partners for Thai basil.
These companions bring their own benefits, from repelling pests to attracting beneficial insects.
1. Marigolds Add Color and Pest Control
Marigolds are a must-have when you’re choosing what to plant with Thai basil.
Their bright orange and yellow blooms attract pollinators while their roots release compounds that deter nematodes.
Marigolds also repel whiteflies and aphids that can stress out tender Thai basil leaves.
Plant a row of marigolds along the edge of your Thai basil bed for a cheerful, functional border.
And they’re tough, thriving in the same hot, dry conditions that Thai basil enjoys.
2. Chives and Garlic Keep Pests at Bay
Alliums like chives and garlic are fantastic when you’re thinking about what to plant with Thai basil.
Their pungent scent masks the sweet aroma of Thai basil, which can attract certain insects.
Chives, in particular, are known to deter Japanese beetles and carrot flies.
Garlic, on the other hand, has antifungal properties that can help protect Thai basil from soil-borne diseases.
These herbs also stay relatively small, so they won’t shade out your Thai basil.
Tuck a few chive plants near the base of your Thai basil for an easy, low-maintenance pairing.
3. Nasturtiums Are a Trap Crop for Aphids
Nasturtiums deserve a spot on your list of what to plant with Thai basil because they’re sacrificial heroes.
Aphids are absolutely drawn to nasturtiums, which means they’ll leave your Thai basil alone.
These trailing flowers also attract hoverflies and predatory wasps that feed on pest insects.
Plant nasturtiums at the edges of your herb bed or let them spill over the sides of a container.
Their peppery, edible flowers add a pop of color to salads, making them useful in the kitchen too.
What NOT To Plant With Thai Basil
Just as important as knowing what to plant with Thai basil is knowing which plants to keep far away.
Some neighbors can stunt Thai basil’s growth or create conditions for disease.
1. Keep Cucumbers and Melons Away From Thai Basil
Cucumbers and melons are heavy feeders that compete aggressively for water and nutrients.
They also spread sprawling vines that can quickly smother your Thai basil.
Additionally, these cucurbits are prone to powdery mildew, which can easily spread to Thai basil’s tender leaves.
If you want to grow both, give them plenty of separation.
Plant Thai basil in a raised bed and keep cucumbers in a far corner or on a trellis.
2. Avoid Fennel and Rue Near Thai Basil
Fennel is notorious for releasing chemicals that inhibit the growth of nearby plants.
That means fennel is a terrible answer to what to plant with Thai basil, since it can actually slow down your herb’s development.
Rue, a medicinal herb, has similar allelopathic effects and can also attract pests like the rue caterpillar.
These plants are best grown in their own isolated spots.
Trust me, keep fennel and rue far away and your Thai basil will reward you with lush, flavorful leaves.
So, What To Plant With Thai Basil?
When you’re deciding what to plant with Thai basil, focus on sun-loving, moisture-matched companions like tomatoes, peppers, leafy greens, and root vegetables.
Add in marigolds, chives, and nasturtiums for extra pest protection and pollinator appeal.
And steer clear of heavy feeders like cucumbers and allelopathic herbs like fennel and rue.
Thai basil is a generous garden partner, offering its fragrant leaves while standing guard over its neighbors.
Plant your Thai basil with the right companions now, and you’ll enjoy a healthier, more abundant garden all season.
Happy planting, and I hope your Thai basil thrives alongside its new friends.