What to Plant Basil With: Best Companion Plants

By Michael Chen · January 23, 2026

Basil grows best when planted alongside vegetables like tomatoes, peppers, and oregano, which enhance its flavor and deter pests naturally.

Why Companion Planting Matters for Basil

Companion planting improves garden health by boosting growth, deterring pests, and enhancing flavor. Basil is a versatile herb that benefits—and benefits—many common garden plants when grown nearby.

Natural Pest Control

Basil repels thrips, flies, and mosquitoes with its strong aroma.
When planted near tomatoes, it deters tomato hornworms.
Its essential oils interfere with pest navigation and feeding.

Flavor Enhancement

Gardeners and chefs alike report that herbs and vegetables grown near basil often exhibit improved taste. Tomatoes, in particular, are said to become sweeter and more aromatic.

Best Companion Plants for Basil

Certain plants form symbiotic relationships with basil, improving each other's growth and resistance to disease.

Vegetables That Thrive with Basil

Tomatoes: Basil improves tomato flavor and repels whiteflies and hornworms.
Peppers: Both sweet and hot peppers benefit from basil’s pest-repelling properties.
Asparagus: Basil can deter asparagus beetles when planted nearby.

Herbs That Pair Well with Basil

Oregano: Acts as a ground cover and attracts beneficial insects.
Chives: Improve soil health and repel aphids.
Parsley: Shares similar moisture and light needs, making co-planting practical.

Plants to Avoid Growing with Basil

Not all plants are compatible with basil. Some compete for resources or inhibit growth.

Mint: Highly invasive and competes aggressively for space and nutrients.
Rue: Inhibits basil growth due to allelopathic chemicals.
Sage: Prefers drier conditions, which conflicts with basil’s moisture needs.

Scientific Insights: How Basil Interacts with Neighboring Plants

Companion Plant	Effect on Basil Growth	Pest Reduction Observed	Yield Increase (%)
Tomato	Positive	Up to 40% (whiteflies)	18%
Pepper	Positive	~30% (aphids)	15%
Oregano	Neutral/Positive	~25% (general pests)	10%
Rue	Negative	No change	-12%
Mint	Negative	No significant effect	-20%

Table data source:1, 2

The data shows that basil yields increase significantly when grown with tomatoes and peppers, while rue and mint hinder growth. Pest pressure is consistently lower in polyculture systems featuring basil.

These findings support integrating basil into vegetable beds strategically, avoiding allelopathic or resource-competitive species.

Common Questions About What to Plant Basil With

Can I plant basil with cilantro?

Yes, but with caution. Cilantro prefers cooler temperatures and slightly drier soil than basil, so their growing windows may not fully align. Monitor moisture levels closely if planting together.

Does marigold help basil grow better?

Yes. Marigolds repel nematodes and attract pollinators, creating a healthier microenvironment for basil. They are excellent companions in vegetable gardens.

Is it okay to plant basil near cucumbers?

Generally yes. Cucumbers do not negatively affect basil, and both enjoy full sun and consistent moisture. However, ensure adequate spacing to prevent fungal issues from humidity buildup.

What flowers can I grow with basil?

Marigolds, nasturtiums, and calendula are excellent choices. Nasturtiums also act as trap crops for aphids, protecting basil indirectly.

Should I plant basil with garlic?

No. Garlic can stunt basil’s growth due to chemical inhibition and differing soil moisture preferences. It’s best to keep these two separated in the garden layout.