Basil and Tomatoes: The Simple Herb Pairing for Better Flavour

A simple herb pairing can change that completely.

Anyone who has tasted sun-ripened tomatoes from their own garden knows that watery and flavourful are worlds apart. Fertilising, watering and choosing varieties only go so far if the environment around the plants is unsuitable. An unassuming culinary herb that almost everyone recognises from a windowsill can make a real difference, while also helping to increase yields and keep plants healthier.

Why a particular herb can genuinely make tomatoes taste better

Tomatoes are highly sensitive to stress. Heat, dry spells, pests and diseases all drain the plant’s energy. Rather than developing flavour and sugars, it has to focus on survival. This is where pairing them with an aromatic herb comes in - one that is already almost always served alongside tomatoes in the kitchen: basil.

Gardeners have reported for years that their tomatoes taste noticeably more intense when basil plants are positioned between, or immediately beside, the tomato canes. This is not magic; it results from several complementary factors.

Tomatoes exposed to less stress from pests, drought and disease ripen more steadily and develop more sugar and flavour.

Basil’s strong scent can disrupt various insects. Whiteflies and aphids are more likely to seek other targets. Tomato plants remain calmer, grow more evenly and can direct their energy into producing fruit. Fruits that ripen under stable conditions generally become sweeter, taste more rounded and are perceived as less acidic.

How basil can boost tomato yields in the bed

Flavour is not the only benefit. Gardening guides report yield increases of around 20 percent and, in some home gardens, even up to 30 percent. This is linked to several effects basil creates in the bed.

Living soil instead of a dry crust

Basil provides light shade over the soil. This prevents the earth from drying out as quickly, keeping it crumbly and biologically active. Moisture is distributed more evenly, so tomato roots experience less stress. Adding mulch extends this effect considerably.

At the same time, basil does not compete excessively with tomatoes for nutrients, provided the soil is reasonably well supplied. Both plants have similar needs for warmth and light, making them easy to grow together in one bed.

More pollinators, more fruit

Once basil starts flowering, its white or purple blooms attract bees, bumblebees and other pollinators. Although tomatoes are self-pollinating, they benefit greatly from vibrations caused by visiting insects. Their flowers are pollinated more effectively, set more fruit and are less likely to drop without being fertilised.

Basil flowers act like a natural magnet for pollinators - tomatoes often hang more densely and in greater numbers on the truss.

For this reason, many gardeners deliberately allow some basil plants to flower rather than removing every bud. The remaining plants are harvested regularly, which keeps them compact and leafy for the kitchen.

Reducing pest pressure without resorting to chemicals

The essential oils in basil release an intense fragrance that people find pleasant but some pests find disruptive. Aphids, whiteflies and certain sap-sucking insects are therefore more likely to keep their distance. This creates a form of natural protective barrier around the tomatoes.

Fewer sap-sucking pests often also means fewer viruses and fungal diseases spread by them. In many gardens, treatments with plant protection products can be reduced. This protects beneficial insects such as ladybirds, lacewings and parasitic wasps, which in turn help when aphids appear.

The more stable growing environment also helps tomatoes cope slightly better with fungal diseases such as late blight and brown rot. They do not become immune, but they often succumb later and produce more ripe fruit beforehand.

How to plant basil with tomatoes correctly

You do not need specialist knowledge to use this effect in your own garden. Tomatoes and basil are ideally matched in terms of timing and growing requirements.

Spacing and planting patterns in a garden bed

This straightforward arrangement has proved effective in beds:

• Leave around 50 to 60 centimetres between two tomato plants.
• Plant one basil plant between them every 30 to 40 centimetres.
• Alternate the plants: one tomato, one basil, then another tomato - row by row.

This creates a living strip of fruiting and leafy plants. The scent spreads well, the soil remains partly covered, and there is still enough room to harvest comfortably between the canes.

Balcony and patio: the ideal pair in a container

The pairing works equally well in container gardens. For one tomato and one basil plant, use a container holding 40 to 60 litres of compost. The larger the pot, the more stable the moisture level and the less stress the plants experience.

Practical container tips:

• Use only high-quality compost that retains a stable structure.
• Position the pot in full sun but, where possible, sheltered from the wind.
• Water regularly and avoid waterlogging; water must not be left standing in the saucer.
• Apply a light mulch to the surface, such as grass clippings or straw.
• Pinch out basil tips regularly to keep it bushy.

Follow this approach and you can harvest aromatic leaves all summer beside warm tomatoes growing only a few steps from the kitchen.

Which varieties work particularly well

In principle, the combination works with most tomato varieties - from balcony cherry tomatoes to large beef tomatoes grown outdoors. It becomes especially interesting when richly flavoured tomato varieties are paired with robust basil types.

Popular examples:

Tomato type	Basil type that pairs well
Cherry tomatoes	Classic green basil, lemon basil
Beef tomatoes	Large-leaved Genovese type
Plum tomatoes / San Marzano types	Basil with an intense aroma, such as varieties with a slightly aniseed-like note
Potted balcony tomatoes	Compact basil forms, such as bushy dwarf types

More important than the exact choice of variety is ensuring that both plants receive plenty of light and warmth. In partial shade, their flavour falls well short of what is possible in a sunny bed.

An even stronger team: more companion plants for tomatoes

Anyone wanting to strengthen their bed further can add a third plant between the tomatoes and basil: borage. This hardy plant with blue flowers attracts additional pollinators, improves soil structure with its deep roots and offers edible flowers for salads as an extra benefit.

A trio of tomatoes, basil and borage creates a small, stable ecosystem. The soil remains active, beneficial insects find food and shelter, and pests face more difficult conditions. As a result, the use of sprays can often be reduced substantially.

How to improve the flavour of your tomatoes even further

The herb pairing is an important element, but it is not the only one. To harvest flavourful fruit, gardeners can adjust several other factors:

• Avoid over-fertilising, particularly with pure nitrogen fertiliser.
• Water less often but thoroughly, rather than giving plants a light daily sprinkle.
• Allow fruits to ripen fully, until they have completely reached their variety’s colour.
• Where possible, grow tomatoes outdoors or beneath a simple rain shelter instead of in a fully enclosed indoor space.

Planting basil among tomatoes helps with several of these points at once: the soil retains more moisture, plants stay healthier and fruit set increases. For many home gardeners, this combination alone is enough to replace the watery supermarket taste with a far more intense flavour from their own garden.

There is one more welcome side benefit: the perfect pesto herb grows directly beside the harvest. Tomatoes from the vine, basil from the bed, a little olive oil and salt - and the effort of companion planting pays off not only for the plants, but on the plate as well.