The power of companion planting (2024)

14 February 2023

How crops can thrive with a little help from their friends.

By Eddie Johnston

The power of companion planting (1)

With 1.5 billion hectares of cropland in the world today, farming is a pretty big deal.

But as we produce more and more crops, we need to make sure we’re doing it in a more sustainable way. Some modern farming techniques, while effective, produce high yields at the cost of the ecosystems around them.

That’s why we’re looking at techniques to farm in a way that works alongside nature, including a very ancient technique; companion planting.

What is companion planting?

Much of the commercial farming done today focuses on growing crops in a monoculture – growing only one type of crop in a field.

While this increases production, and makes it easier for farmers to process and gather crops, it runs the risk of pests and diseases spreading, soil health depleting and local levels of biodiversity decreasing.

Companion planting is an alternative to monoculture. Alongside the crops that you want to harvest, you also plant other species that have a positive effect.

This can range from reducing pests, increasing pollination, and even making crops more nutritious.

But companion planting isn’t a new idea. In fact, it’s been a part of agriculture for thousands of years.

The power of companion planting (2)

Introducing the Three Sisters

Several groups of indigenous peoples in North America have been making use of companion planting to maximise their crop growth since the dawn of plant domestication.

The key companion planting technique used maize (Zea mays), beans (such as Phaseolus vulgaris) and squash (Cucurbita pepo), collectively known as the Three Sisters.

These three plants work together in beautiful symbiosis to grow stronger than they ever could separately, with each individual supporting the growth of the other two.

The bean and maize seeds are planted together in small mounds of earth, with squash seeds sown in between.

The maize grows tall, which provides a structure for the beans to climb. In return, the tendrils of the bean plants wrap around the maize stem, securing against damage from high winds. The beans also provide another benefit in nitrogen fixing – they can harness the nitrogen in the air, and move it into the soil in a form that the plants can make use of.

The power of companion planting (3)

The power of companion planting (4)

The squash work on the ground looking after the soil for the other plants. Their wide leaves cover the ground, stopping it from drying out, as well as preventing the growth of unwanted weeds. Certain varieties of squash have spiny leaves that deter any potential grazers, like deer or squirrels, from taking a bite out of the crops.

Some North American peoples also plant flowering crops around the edges of their fields, such as sunflowers (Helianthus anuum), which encourage visits from pollinators and create a natural boundary fence.

The power of companion planting (5)

With friends like these

The Three Sisters is a fantastic example of how companion planting can support crops, but it’s far from the only example.

Sometimes this can happen as a happy accident. Clover, a plant often seen as an unwanted weed, is actually a member of the legume family. This means, just like beans in the Three Sisters, they are able to fix the nitrogen into the ground. Many grass crops, like rice or wheat are then able to use this fixed nitrogen to grow stronger, and more nutritious.

Other companion planting strategies involve keeping potential pests away from your fruits and veg. A famous pairing of crops is carrot and onion, which protect each other from potential predators with their odours.

The power of companion planting (6)

The power of companion planting (7)

The maggots of the onion fly (Delia antiqua) can infest the bulbs and stems of onions, potentially destroying whole crops. Similarly, the larvae of carrot flies (Chamaepsila rosae) attack the outer layers of carrots. But chemicals given off by onions repel carrot flies, while carrot chemicals having a similar effect on onion flies.

This happy coincidence means that both plants can grow together, fragrantly keeping each other safe from insect attack.

It’s not just carrots and onions that give off shielding smells. Many marigolds, including Mexican marigolds (Tagetes erecta) are a common sight around vegetable plots, including Edible Science: Kew’s Kitchen Garden.

Marigolds release chemical scents that reduce the reproduction of aphids, helping protect crops against a potentially lethal sap-draining infestation.

The power of companion planting (8)

Under cover

Another companion planting technique involves keeping your crops in the dark. Well, at least some of the time.

While crops need sunlight to grow, it can be too much of a good thing. Plants can overheat and burn if exposed to too much sunlight.

Trees can provide perfect cover for crops that thrive in shade, which includes certain varieties of coffee.

Shade-grown coffee involves either planting coffee plants (Coffea arabica) alongside young saplings, or planting them in existing forest land, to provide them with a more suitable environment.

The trees provide cover for the coffee, stopping it from getting damaged by the sun, as well as protecting it from heavy winds and rain.

The trees also help to support the ecosystem around the coffee crops, supporting insect life and attracting both pollinators and pest-eating predators.

The power of companion planting (9)

The power of companion planting (10)

Looking to the future

Companion planting is an age-old technique that’s now more relevant than ever.

While many of these techniques only work at smaller scales, the principles can teach us ways to feed the world by working alongside nature.

All we need to remember is that just like us, companion plants are stronger together.

Read & watch

  • 30 May 2022 Milpas in Mexico: maintaining an ancient farming system Charlotte Phillips
  • 3 December 2019 Conserving the cousins of our crops Ellie Wilding, Dr Christopher P co*ckel
  • 14 October 2019 Maize’s missing cousins: Shedding light on photosynthesis Dr Jan Hackel
The power of companion planting (2024)


What is the benefits of companion planting? ›

There are many potential benefits of companion planting including repelling or trapping pests, weed suppression, improved soil fertility, improved pollination and increased crop productivity.

What are the basics of companion planting? ›

Like people, some plants thrive surrounded by others. Companion planting is the practice of growing several types of crops near one another to enhance crop production. In general, plants with known positive relationships should be planted within two or three rows of each other.

What is the science behind companion planting? ›

Deterring damaging pests: Monoculture means growing many of the same crop plants in one space. In contrast, research shows that polyculture (companion) plantings reduce pest pressure. More plants mean it's harder for pests to find their hosts.

What should you not plant near tomatoes? ›

Companion Plants To Avoid Growing Near Tomatoes
  • Cabbage. Planting a member of the brassica family, like cabbage, can stunt the growth of your tomato plant because they out-compete them for the same nutrients. ...
  • Corn. ...
  • Broccoli. ...
  • Fennel. ...
  • Dill. ...
  • Potatoes. ...
  • Eggplant. ...
  • Walnuts.
May 25, 2023

Does companion planting improve soil? ›

Moreover, companion planting plays an important role in improving soil available nutrients, enhancing soil enzyme activities, enriching the diversity of microbial species, and reducing the occurrence of soilborne diseases [5-7].

Do plants help each other grow? ›

Yet there are many empirical studies that show that plants can also facilitate each other. Tielbörger says this is often the case when plants grow under stressful conditions—for instance, when the soil is saline or the temperatures are high.

What plants grow best next to each other? ›

Companion Planting Chart
Type of VegetableFriends
CabbageBeets, celery, chard, lettuce, spinach, onions
CarrotsBeans, lettuce, onions, peas, peppers, tomatoes
CornClimbing beans, cucumber, marjoram, peas, pumpkins, squash, sunflowers, zucchini
OnionsCabbage, carrots, chard, lettuce, peppers, tomatoes
12 more rows

What are the four friends that help a plant grow? ›

The five things plants need to grow are sunlight, water, minerals, and food. With the passage of time, fruits and flowers start growing, and the plant grows fully.

What vegetables grow best together? ›

Which Vegetables Grow Well Together?
VegetableCompanion PlantDon't Plant Together
MelonsCorn, pumpkin, radish, squashNone
OnionsBeets, carrots, Swiss chard, lettuce, peppersAll beans and peas
PeasBeans, carrots, corn, cucumbers, radish, turnipGarlic, onions
PotatoesBeans, corn, peasTomatoes
11 more rows
Jun 26, 2021

What do you call a person who loves planting? ›

A person whose hobby or job is growing flowers in a garden is called a gardener. If you want homegrown flowers and veggies, get to know a gardener.

What are the three companion plants? ›

The Three Sisters planting method, commonly known as companion planting, entails growing corn, beans, and squash together in a mutually beneficial arrangement. It originated in North America around 3000 years ago.

Can plants make friends? ›

Plant buddies help each other out in times of stress! Maybe these wildflowers in Death Valley should consider a buddy.

Why should you not plant cucumbers near tomatoes? ›

When planting cucumbers and tomatoes together, you must ensure there is enough room between them. Not doing this will mean the plants will compete for light, room and nutrients. 'Space individual plants 18 to 24 inches apart in rows that are spaced between 3 to 4 feet apart.

What not to plant near cucumbers? ›

Plants to Avoid Planting Near Cucumbers
  • Potatoes, as they are both susceptible to fungal disease blight.
  • Aromatic herb plants like sage and basil as these can inhibit growth of cucumbers.
  • Melons - they are both the same family so susceptible to the same pests increasing the chances of a pest wipeout. .

What not to plant with bell peppers? ›

Brassicas: Almanacs and home gardeners recommend avoiding planting brassicas (cabbage, broccoli, kale, collards, cauliflower) near peppers because they require different soil acidity levels and can deter pepper plant growth.

Does companion planting increase yield? ›

Companion planting is a traditional gardening practice, designed to improve crop yield by attracting pollinators and other beneficial insects.

What are the disadvantages of intercropping companion planting? ›

Third, randomly sticking plants in the soil together, even those recommended as companions, is usually not a good idea, and may even reduce your harvest. For example, tomatoes may crowd out basil planted alongside it, with the result that the basil harvest is considerably less than if it had been planted on its own.

Why should you not plant certain plants next to each other? ›

Some plants dislike each other and can be harmful in several ways, including: Competing for resources: Plants with a similar root system, such as trees and shrubs, may compete for water and nutrients in the soil. This can cause one plant to grow poorly and become more susceptible to diseases.

Should plants in the same family be planted together? ›

Plants in the same family tend to have similar fertility requirements and pest problems. When you plant by family, it is also easier to rotate crops in the garden. Beans and peas are in the Fabaceae or legume family. Cucumbers, squash, melons and pumpkins are in the Cucurbitaceae family.

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