Thursday, September 24, 2026

In both agronomy and the kitchen, there’s an enduring rule of thumb: what grows together, goes together.

For centuries, farmers, gardeners, and agronomists have recognised that certain plants thrive when planted side-by. These pairings, known as companion planting, do a lot more than just look good in a crop rotation. They actively protect one another from pests, improve soil structure, attract vital pollinators, and in many cases, produce flavour profiles that complement each other on the dinner plate.

As we look towards more sustainable agricultural practices, understanding these partnerships gives us fascinating insights into natural pest control, soil protection, and culinary pairings. 

Here’s a look at some of nature’s most effective agricultural pairings and why they work so well from field to fork.

Tomatoes, Basil, and Marigolds

Tomato and basil might be a classic flavour profile in many dishes, but their relationship begins long before they hit the kitchen. In fact, basil emits a strong aromatic scent that helps repel aphids, one of the primary threats to young tomato vines. Another benefit of planting the two together is that basil flowers attract bees to the tomato plants, helping with pollination and crop yield. 

Going one step further and adding Marigolds to the mix creates an even more robust environment for tomatoes. The plant’s flowers act as a sacrificial crop against unwanted pests while also attracting pollinators and emitting a distinctive scent that deters white flies. This  makes them an equally effective pairing for brassica crops. 

Brassicas and Alliums

Speaking of brassicas, cabbages, brussel sprouts, and kale are notoriously vulnerable to hungry pests, including cabbage moths, loopers, aphids, and cabbage maggots. 

The secret to protecting these nutrient-dense crops lies within the allium family: onions, spring onions, garlic, and leeks.

Alliums release strong sulfur compounds into the air. This pungent scent masks the natural aromas of brassicas, confusing flying pests and preventing them from landing to lay eggs or feed on the crops. 

Across cuisines, onions and brassicas form the savoury backbone of winter roasts, stews, and side dishes demonstrating how field pairings translate directly into kitchen staples.

Carrots and Leeks

The partnership between carrots and leeks is yet another great example of nature-led pest control at work. 

Indeed, carrots give off a scent that repels the leek moth, while leeks emit a fragrance that deters the dreaded carrot root fly. By interplanting these two crops, they effectively protect each other from their respective predators. 

Beyond their teamwork in the garden, carrots and leeks also serve as an aromatic base for stocks, carreroles, and Sunday dinners.

Beans, Sweet Peas, and Nasturtiums

When it comes to protecting leguminous crops like runner beans and green peas, a combination of pollinator attraction and decoy planting makes all the difference towards producing a successful harvest.

Anyone who’s had these in their garden will undoubtedly know that nasturtiums and sweet peas are exceptionally attractive to caterpillars and black aphids. Planting these flowers along bean rows not only attracts pollinators but also creates a natural decoy as pests swarm the flowers first, leaving the bean pods to mature undamaged.   

Nasturtiums are entirely edible. If any survive the caterpillars, their seeds can be pickled into a brilliant substitute for capers, while their pepper-flavored leaves make a vibrant pesto that pairs beautifully with cooked beans and cabbages.

Borage and Strawberries

One lesser known powerhouse in regenerative gardening is Borage, or starflower.

Great for wildlife, borage produces vibrant blue flowers that attract bees and beneficial predatory insects and growing it alongside strawberries can improve the fruit's overall flavour and yield.

For anyone partial to a Pimm’s on a sunny summer’s day, cucumber-flavored borage flowers and fresh strawberries pair incredibly well as a classic garnish for a refreshing Pimm's cocktail.

Sweetcorn, Climbing Beans, and Squash

Perhaps the most famous companion planting system in agricultural history is "The Three Sisters": a indigenous farming technique combining sweetcorn, climbing beans, and squash.

Not only do the three crops go well together in a culinary sense, but their root structures and nutrient requirements help them work in harmony, protecting and nourishing each other.

While sweetcorn grows tall and sturdy, providing a live trellis for climbing beans to wind around, climbing beans convert nitrogen from the air into the soil to feed the corn and squash. All the while, squash sprawls across the ground with broad, prickly leaves, creating a living mulch that shades the soil, retains moisture, and deters ground pests.

Harmonising Field and Fork

Companion planting demonstrates that nature rarely operates in isolation. By observing how plants support, shelter, and nourish one another, we gain a deeper appreciation for natural pest control, soil protection, and flavour development.

Whether it's the structural genius of the Three Sisters or the simple pest-repelling power of onions planted next to cabbages, working with natural agricultural relationships leads to healthier crops, resilient soils, and exceptional food.