Intercropping

Nature’s Secret to Growing More Food in Less Space

By Alison Gilchrist, CEO, GFS Perth

If you’ve ever wandered through a natural bushland or forest, you’ll have noticed that nature doesn’t grow in tidy, regimented rows. Trees, shrubs, grasses, herbs and flowers all live alongside one another, each occupying its own niche, each making a different contribution, and together creating an ecosystem that is remarkably productive and resilient. Nature has never been particularly interested in monocultures. Diversity, it seems, has always been her preferred way of working.

For much of modern agriculture, however, we have tended to think differently. We separate crops into neat rows, dedicate whole fields to a single variety and often view anything growing alongside our chosen crop as competition. Yet one of the oldest farming practices in the world challenges that thinking.

It is called intercropping, and although the name may sound technical, the idea is beautifully simple. Rather than growing one crop on its own, intercropping involves deliberately growing different plants together so that each supports the others. It is a principle embraced within permaculture because it mirrors the way healthy natural systems have always functioned.

Traditional cultures understood this instinctively. One of the best-known examples is the “Three Sisters” planting system developed by Indigenous peoples of North America.

Corn grows tall and provides a living support for climbing beans. The beans return nitrogen to the soil, enriching it naturally, while sprawling squash shades the ground, reducing weeds and helping the soil retain precious moisture. Individually they are useful crops. Together they become something greater than the sum of their parts.

The more we understand how plants interact, the more remarkable these relationships become. Some species develop deep roots that draw nutrients from far below the surface, while others gather nourishment from the upper layers of soil. Some create welcome shade for neighbouring plants during the hottest part of summer, while others attract bees, butterflies and beneficial insects that improve pollination across the entire garden.

Certain flowers even help confuse or deter common pests, reducing the need for chemical intervention. Instead of competing for every available resource, the plants begin to cooperate, each contributing to the health of the wider system.

That cooperation brings a whole range of practical benefits for gardeners. Intercropping makes more efficient use of available space, helps suppress weeds by covering bare soil, reduces water loss through evaporation and encourages healthier, more biologically active soils. Greater plant diversity also creates habitats for insects and pollinators that are essential to productive gardens.

Research continues to demonstrate that thoughtfully designed intercropping systems can make better use of sunlight, water and nutrients than growing individual crops in isolation, while often producing healthier harvests at the same time.

One of the lovely things about intercropping is that it doesn’t require complicated planning. Many of the combinations are surprisingly familiar.

Carrots and spring onions are often planted together because each can help confuse the other’s common pests.
Tomatoes thrive alongside basil, which is thought to help deter some pests while making excellent culinary companions in the kitchen.
Lettuce grows happily beneath taller crops such as tomatoes or corn, making good use of the shade during warmer months.
Climbing beans can be grown with sweet corn, using the sturdy stems as a natural trellis while enriching the soil with nitrogen.
Herbs such as thyme, oregano and chives attract beneficial insects, while cheerful flowers like calendula and nasturtiums not only brighten the vegetable patch but also draw in pollinators and provide edible flowers for salads.

Rather than thinking of the garden as separate beds of individual crops, intercropping encourages us to see it as a community of plants, each making life a little easier for its neighbours.

Here in Western Australia, where every drop of water matters, these principles are especially valuable. Covering the soil with living plants helps protect it from our intense summer sun, reducing evaporation and keeping the root zone cooler.

Different root structures improve soil health over time, while greater biodiversity creates gardens that are naturally more resilient to changing weather conditions. As we face increasing environmental pressures, learning to work with nature rather than against it feels less like an interesting gardening technique and more like common sense.

One of the things I find most fascinating about intercropping, however, is that it teaches us something that extends well beyond the garden gate. Healthy communities are built in much the same way. We often assume that similarity creates strength, yet time and again we discover that diversity is what makes communities truly resilient.

People of different ages, backgrounds, cultures and life experiences each bring something unique. Some offer wisdom gathered over decades. Others bring fresh ideas and youthful enthusiasm. Some naturally lead, while others quietly encourage. Some have practical skills, while others have the gift of listening. Like the plants in an intercropped garden, our differences are not weaknesses to overcome but strengths to cultivate.

That understanding sits at the very heart of what we are creating through Friendship Central. Our permaculture gardens are not simply demonstration plots designed to show people how to grow vegetables. They are living classrooms where sustainable gardening, environmental stewardship and friendship are woven together.

Every workshop, every volunteer session and every conversation over a cup of coffee becomes an opportunity to learn that caring for creation and caring for one another are, in many ways, the same task viewed from different angles.

The beauty of intercropping is that anyone can begin. You don’t need hectares of farmland or years of gardening experience. A single raised bed or even a few pots on a patio can demonstrate the principle. Plant basil beneath tomatoes, tuck spring onions between beetroot, allow lettuce to grow around slower-maturing brassicas or weave nasturtiums through your vegetables to attract pollinators while adding edible flowers to the table. Start small, observe carefully and let the garden become your teacher.

Perhaps that is one of the greatest lessons nature has to offer. She reminds us that growth is rarely about standing alone. Whether we are talking about plants, people or communities, we flourish most when we learn to grow together, each contributing our own unique gifts to something far bigger than ourselves.