Companion Plants New Zealand

Not all garden friendships are meant to be. But when plants find the right company, that is when a little garden magic can begin.

Companion planting is the practice of growing different plants together so they can share space and, in some cases, support one another. A good pairing may attract pollinators or beneficial insects, provide shade, cover bare soil, make better use of vertical space or help make a crop less obvious to passing pests.

It is less about following a rigid list of garden rules and more about creating a diverse, balanced growing space. Whether you are nurturing a few lettuces on a balcony or planning a full vegetable garden, this guide to companion planting in NZ will help you choose some useful combinations to try.

What is Companion Planting?

Companion planting simply means growing two or more plant species close together for a practical benefit. This may include:

• attracting bees and other pollinators

• encouraging hoverflies, lacewings, ladybirds and parasitic wasps that prey on common garden pests

• using a taller crop to support or shade another

• covering bare soil to help conserve moisture and suppress weeds

• making use of different root depths and growing heights

• including a trap crop that attracts pests away from the crop you most want to protect

• increasing the overall diversity and resilience of the garden

Some traditional companion-planting combinations are supported by research, while others are based largely on gardeners' observations. Results can also vary with climate, soil, spacing and the pests present in your garden. Think of this companion planting chart as a useful starting point rather than a set of unbreakable laws.

Why Try Companion Planting in a New Zealand Garden?

Here in New Zealand, we garden across a remarkable range of climates. What thrives in subtropical Northland may need a sheltered corner or a later sowing date in Southland. Companion planting does not replace healthy soil, correct sowing times, crop rotation, watering or regular pest checks, but it can work beautifully alongside them.

Mixing flowers and herbs through the vegetable garden creates more sources of nectar and pollen and can provide habitat for beneficial insects. Dense, thoughtful planting may also leave less bare ground, protect soil from harsh sun and make better use of a small garden.

Above all, companion planting encourages us to view the garden as a living community rather than a row of crops growing in isolation.

Companion Planting Chart NZ

Use this quick companion planting table when planning your vegetable beds. The final column highlights practical considerations, not forbidden pairings. Sunlight, airflow, water and room to grow usually matter more than garden folklore about plants that supposedly dislike one another.

Some plants earn their place in almost any productive garden because they flower generously, fit easily between crops or provide more than one use.

1. Alyssum

Sweet alyssum forms a low, flowering edge and provides nectar for hoverflies and other beneficial insects. It fits neatly beside tomatoes, brassicas, cucumbers and paths without taking up too much room.

2. Basil

Basil and tomatoes enjoy similar warm growing conditions, which makes them natural bedfellows in the summer garden. There is also some evidence that interplanting basil may help reduce thrips around tomatoes. Keep both plants well spaced so they receive enough light and airflow.

3. Borage

Borage produces abundant blue flowers that are highly attractive to bees. It is a useful addition near strawberries, fruit trees, pumpkins, cucumbers and melons, but it can become a large plant, so give it room or position it at the edge of the bed.

4. Calendula

Calendula brings long-lasting colour and an accessible source of nectar and pollen. Tuck it among vegetables or around the edges of beds to encourage a wider range of insect life.

5. Coriander and dill

Allow a few coriander and dill plants to flower. Their small, open blooms are easy for hoverflies and tiny beneficial wasps to feed from. Position tall dill where it will not shade smaller vegetables.

6. Marigolds

Marigolds add colour and diversity, and some studies have found that marigolds grown with tomatoes may reduce certain pests. Their famous ability to control soil nematodes, however, is often overstated. Benefits depend on the marigold species, nematode and growing method, and may require marigolds to be grown densely as a cover crop before being incorporated into the soil.

7. Nasturtiums

Nasturtiums provide edible flowers, ground cover and a colourful landing place for pollinators. They can attract aphids, which may make them useful as a monitored trap crop. Check them regularly and remove heavily infested growth before pests spread to nearby vegetables.

8. Thyme, oregano and chives

These compact flowering herbs are easy to weave through a productive garden. Their blooms attract pollinators and beneficial insects, while the plants provide plenty for the kitchen too. A companion that earns its keep twice is always welcome.

What Grows Well with Popular Vegetables?

1. Tomatoes

Try tomatoes with basil, alyssum, chives or marigolds. Basil shares the same love of summer warmth, while flowering companions help bring pollinators and beneficial insects into the bed. Keep the base of each tomato open enough for watering, feeding and airflow.

2. Pumpkins

Pumpkins are traditionally grown with corn and climbing beans in the Three Sisters system. Corn provides height, beans climb and broad pumpkin leaves shade the soil. This combination needs careful timing, good fertility and plenty of space. Sow the corn first so it is strong enough to support the beans.

3. Carrots

Carrots can share a bed with spring onions, chives, leeks, radishes and lettuce. Quick-growing radishes or leafy greens can be harvested before the carrots need all the space. The often-repeated idea that onions completely prevent carrot fly should not replace protection and good garden hygiene where this pest is a problem.

4. Lettuce

Lettuce grows well beside spring onions, chives and radishes. In hot weather, it can also benefit from light afternoon shade cast by a taller crop such as corn or climbing beans. Avoid deep shade, which can encourage weak growth, slugs and disease.

5. Peas

Grow peas vertically with carrots, turnips, radishes or lettuce below. This makes efficient use of a small bed, and the lower crops can help cover the soil. Peas fix nitrogen with the help of soil bacteria, but most of that nitrogen supports the pea plant while it is growing. Neighbouring crops benefit more once the pea residue breaks down.

6. Melons

Plant alyssum, borage or nasturtiums nearby to draw pollinators into the garden. Melons need full sun and warmth, so keep companion plants low enough that they do not shade the vines.

7. Cucumbers

Dill, alyssum and nasturtiums add flowers around cucumbers and help attract pollinators and beneficial insects. Sunflowers can provide some support, but a strong trellis is more reliable once cucumber vines are heavy with fruit.

8. Beans

Beans can be grown with corn, radishes, marigolds or summer savory. Climbing beans need sturdy support and should be positioned where they will not shade lower crops. Like peas, beans do not automatically release large quantities of nitrogen to nearby plants during active growth.

9. Corn

Corn pairs well with climbing beans and sprawling pumpkins or squash when the Three Sisters method is planned carefully. Plant corn in a block for good wind pollination, allow it to establish before adding beans and leave enough room for the squash vines to spread.

10. Brassicas

Broccoli, cabbage, cauliflower, kale and Brussels sprouts can be mixed with alyssum, dill, coriander, thyme, onions or nasturtiums. These companions increase diversity and some combinations may help reduce caterpillar damage, but they are not an invisible force field. Inspect brassicas often and cover them with fine insect mesh if white butterflies are persistent.

Natural Pest Control with Companion Planting

Companion planting works best as one part of an integrated approach to pest control. A colourful mixture of herbs, flowers and vegetables can help beneficial insects find food and shelter, while trap crops may draw certain pests into an area where they can be monitored and removed.

For the best results:

1. Grow several types of flowers and let some herbs bloom.

2. Include different flower shapes and aim for blooms across the seasons.

3. Inspect both the companion and main crop regularly.

4. Remove badly infested trap plants before pests move elsewhere.

5. Combine planting with crop rotation, healthy soil, good spacing, hand-picking and insect mesh where needed.

6. Keep notes on which combinations work in your own garden and climate.

The goal is not a pest-free garden. A small population of prey insects helps keep beneficial predators visiting. We are building a balanced neighbourhood, not destroying every bug in sight.

Which Vegetables Should Not be Planted Together?

Many online charts contain long lists of plants that are said to be enemies, but much of this advice is not well supported by research. In the home garden, practical competition is usually the more useful thing to consider.

Avoid combinations where:

• one plant will heavily shade another that needs full sun

• vigorous vines will smother smaller crops

• plants are packed too closely for good airflow

• crops have very different watering needs

• harvesting one crop will damage the roots of another

• closely related crops are continually grown in the same place, increasing the risk of shared pests and diseases

Fennel is often given its own space because it is allelopathic and releases chemical compounds that hinder nearby plants. Potatoes and tomatoes are also best separated when practical because they share some pests and diseases, including late blight. This is about garden management rather than plants simply refusing to get along.

Companion Planting FAQs

What vegetables grow well together in NZ?

Useful combinations include tomatoes with basil and alyssum; carrots with spring onions and radishes; lettuce with chives and taller summer crops; peas with low-growing leafy vegetables; and corn with climbing beans and pumpkins. Choose pairings suited to your local sowing season, available space, sun and rainfall.

Which vegetables shouldn't be planted next to each other?

There are few pairings that are universally harmful. Focus on avoiding overcrowding, excessive shade, tangled harvesting and combinations of crops that share serious pests or diseases. Give large plants such as pumpkins and hindering fennel room, and consider separating potatoes from tomatoes.

Can I plant all my vegetables together?

You can mix many vegetables, herbs and flowers, but every plant still needs suitable light, soil, water, airflow and space. Group plants with similar growing needs and make sure vigorous crops will not overwhelm slower or smaller neighbours.

What is the easiest companion plant?

Sweet alyssum is one of the easiest companion plants to add to a vegetable garden. It stays relatively low, flowers for a long period and attracts pollinators and beneficial insects. Calendula, coriander, dill, chives and marigolds are also simple, useful choices.

Do marigolds keep pests away from vegetables?

Marigolds can increase garden diversity, provide flowers for insects and may help reduce certain pests in some crop combinations. However, they do not repel every pest, and simply planting one marigold beside a vegetable will not reliably control nematodes. Use them as part of a wider pest-management plan.

Does companion planting really work?

Some methods have good practical or research support, including growing flowers for beneficial insects, using trap crops, intercropping plants with different growth habits and covering soil with living plants. Other traditional pairings are supported mainly by anecdote. Observe your own garden, keep what works for your specific zone and garden habitat.

Grow Better, Together

Companion planting is more than a checklist of who likes whom. It is a way of looking at the whole garden and choosing diversity over bare soil, flowers alongside food and thoughtful partnerships over rows of isolated plants.

As you plan your patch this season, think not only about what you are growing, but what could grow alongside it. Start with one or two simple combinations, watch what happens and let your garden teach you the rest.

Ready to sow smarter? Explore the full Kings Seeds range of vegetables, herbs, flowers and companion-friendly seeds, and grow a more beautiful, balanced garden together.