Plant Basil Between Tomatoes for Better Flavour

A simple planting trick can make all the difference.

Watered, fed, supported and shielded from rain: tomatoes often receive the lion’s share of attention in the garden. Yet in some years their flavour still fails to live up to expectations. What many people overlook is that variety, sunshine and water are not the only influences on taste; neighbouring plants in the bed matter too. One very common culinary herb can make tomatoes noticeably more flavoursome, without chemicals or specialist fertiliser.

Why this humble culinary herb noticeably improves tomato flavour

Tomatoes and basil are considered a perfect pairing in the kitchen, and this combination can be remarkably effective in the garden as well. Gardeners have long reported that fruits smell more intense and taste sweeter when basil grows directly between the tomato plants.

“Anyone who plants basil between tomatoes creates a small ecosystem in which the fruits can ripen undisturbed and develop more flavour.”

One important reason is that basil’s strong scent can confuse common pests such as whiteflies and aphids. These insects pierce the leaves, weaken the plants and put them under stress. Stressed tomato plants often stop ripening earlier, produce smaller fruits and accumulate less sugar.

When plants are calmer and not under constant attack, their fruits can remain on the vine for longer. During this period, they store more natural sugars and flavour compounds. It is this combination that creates the familiar “sun-ripened tomato feeling” that many people only associate with holidays.

More yield, less stress: what else basil does in the vegetable bed

Garden guides also point to a measurable effect on harvest volumes. In some trials, tomato plants grown alongside basil increased their yield by around 20 per cent on average; in some home gardens, the increase was as much as 30 per cent.

• more reliable fruit set thanks to increased pollinator activity
• a more even microclimate around the plants
• lower disease pressure because the plants remain stronger

Basil casts a light shade over the soil, meaning it does not dry out as quickly and moisture levels stay more balanced. Tomatoes are therefore less exposed to the repeated cycle of “bone-dry soil” followed by “a full watering can” - a source of stress that can often impair flavour and cause fruits to split.

As the plants stay more vigorous, many gardeners leave the fruits on the vine for longer, until they are fully ripe. Tomatoes picked when ripe almost always taste sweeter and less acidic than fruit harvested early and left to ripen afterwards.

How basil protects tomatoes and brings the vegetable bed to life

Basil offers another major benefit: its flowers attract bees, bumblebees and other pollinators in large numbers. As they fly past, they repeatedly brush against the yellow tomato flowers too, increasing the pollination rate.

“A flowering border of basil alongside a row of tomatoes acts like a magnet for pollinators and strengthens every individual plant.”

At the same time, the herb’s strongly scented oils can disrupt certain sucking and piercing insects. This does not replace a complete plant-protection approach, but it can substantially reduce the pressure. Many home gardeners report fewer aphids and, in some cases, fewer fungal problems because the tomato plants remain more resilient overall.

The ‘three-plant partnership’: tomatoes, basil and borage

Some experienced gardeners take the pairing one step further by adding borage. This blue-flowering plant is also a classic companion in a vegetable garden.

• borage flowers attract many beneficial insects
• its deep roots loosen the soil and draw nutrients up from deeper layers
• cut borage shoots can be used as mulch around tomatoes

Together, they create a lively strip: insects buzz overhead, tomatoes grow through the middle, and herbs spread between and beneath them. This diversity stabilises the small ecosystem in the bed. Rather than repeatedly relying on sprays, insects, roots and plant compounds work together here, quietly providing protection.

How to plant basil correctly between your tomatoes

For the full benefit, tomatoes and basil should begin with similar conditions: warmth, plenty of light and protection from late frosts. In the UK, planting from May is generally suitable, although in some areas it is better to wait until early June, when nights are reliably frost-free.

Spacing in an outdoor bed

The following distances have proved effective in a traditional vegetable bed:

• around 50 to 60 centimetres between two tomato plants
• one basil plant in between, at a distance of roughly 30 to 40 centimetres

In practical terms, this means one tomato, then one basil plant, followed by another tomato, repeated along the entire row. This arrangement means the herbs do not merely surround the tomatoes in isolated spots; they create a loose scented barrier along the full planting line.

Pots and balconies for urban gardens

This method also works without a garden bed. Anyone with only a balcony or patio can grow a tomato and basil together in a sufficiently large container. A pot holding 40 to 60 litres is usually enough for one tomato plant and one strong basil plant.

The essentials are:

• good-quality, loose potting compost
• drainage holes in the base of the container
• an evenly moist root area rather than permanently wet soil

Regular watering without waterlogging allows both plants to develop their full flavour. A thin mulch layer, such as grass clippings, chopped straw or dried leaves, helps retain moisture in the pot, especially on hot summer days.

Care tips: keeping basil and tomatoes flavoursome for longer

Basil develops a bushy habit when it is cut regularly. Frequently harvesting the shoot tips encourages the plant to produce fresh growth. As a result, its leaves remain more tender and intensely flavoured.

“A quick reach for the scissors every few days strengthens basil - and puts it straight into a salad, pasta or on a slice of fresh tomato.”

Tomatoes also benefit from attentive, but not excessive, care. Useful measures include:

• removing side shoots from cordon tomatoes in good time
• lightly removing leaves from the lower part of the plant to improve air circulation
• watering directly around the roots rather than over the foliage

These steps reduce the risk of fungal diseases such as blight. Less disease pressure means the fruits can ripen for longer and more evenly, often reaching the kitchen at exactly the right moment.

Why tomatoes often taste bland - and how basil helps change that

Many flavour problems can be traced back to three factors: too little sunshine, too much water at once and harvesting too early. Those who pick tomatoes very early out of caution deny them the final ripening phase, when a large share of their flavour compounds develops.

With basil in the vegetable bed, it becomes easier to allow fruits to ripen properly. The plants cope for longer, show fewer signs of stress and withstand minor pest damage more effectively. Their leaves and shoots stay healthy for longer, allowing the tomatoes to remain on the vine until they have developed their full colour and flavour.

There is also an interesting psychological effect: anyone regularly walking through the bed to pick fresh basil will automatically check how ripe the tomatoes are. As a result, hardly any fruit is forgotten, and harvest timing can be judged much more precisely.

Everyday examples of combining tomatoes and basil

A typical family-garden layout might include a row of four or five tomato plants, with three basil plants between them and one or two borage plants at the edge. The borage flowers first in June, followed later by the basil. Throughout the summer, the bed hums with activity while the tomato plants ripen undisturbed.

On a city balcony, a large container holding one tomato, one basil plant and a low-growing flowering herb can provide the same effect on a smaller scale. Anyone plucking a few basil leaves while watering in the evening can notice the difference in quality immediately: a still-warm tomato from the container, sliced and scattered with fresh basil, tastes far more intense than many supermarket tomatoes.

You can also experiment with varieties: fleshy beefsteak tomatoes are particularly flavoursome with robust Genovese basil, while sweet cherry tomatoes pair well with small-leaved basil varieties. In every case, the herbal companion improves not only flavour but also the overall appearance of the garden: less bare soil, more greenery, more flowers - and a vegetable garden that looks better and tastes better.