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Companion planting with zucchini: location, soil & spacing

If you want to plan a mixed crop with zucchinis, there are a few important things to know. Like melons and pumpkins, zucchinis belong to the cucurbitaceae family. All plants in this family are particularly heat-loving and prefer sunny, sheltered locations with humus-rich, loose soil. Zucchinis are heavy eaters and require a lot of nutrients. Zucchini plants also need sufficient water, especially during flowering and fruiting, as their fruits consist largely of water. Depending on the variety, they grow bushy, climbing or creeping with a shallow root system. As it usually grows rather sprawling, it needs enough space in the bed and you need to plan for around 100 x 100 cm for most varieties. When grown vertically, the plant needs less space. You can find out which varieties are suitable for vertical cultivation and more tips on growing zucchinis in a space-saving way in this article.

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Companion plants for zucchini: What to plant next to zucchini?

Zucchinis are a popular vegetable in the garden and kitchen. As zucchini plants are very productive, one or two plants are often enough to feed an entire family. To make good use of the space in your bed, you can therefore plant other plants next to the zucchinis. In general, when choosing neighbors, you should make sure that they have similar location and nutritional requirements and differ in their growth habit and root depth so that there is no competition and you make the best use of the space in your bed. We list the companion plants below:

  • Due to the shallow roots of pumpkin plants, plants with deep roots go well next to zucchinis. Root vegetables such as beet, celery and carrots therefore complement them well. This means there is no competition for nutrients.
  • Onions, leeks and spring onions also fit well in the zucchini bed. As bed neighbors, they keep some pests such as aphids, carrot flies and cabbage white butterfly caterpillars away from your bed with their strong smell. A tea or decoction made from onions can also be used to strengthen plants and prevent mildew. If your zucchini plants are infested with pests, you can treat them with onion stock.
  • If you grow your zucchinis as climbing plants, you can grow ground-covering plants underneath the zucchini. Lettuce or herbs can use the space at the foot of the zucchini and act as a mulch layer. On the other hand, you can plant corn or sunflowers next to the zucchini as a climbing aid, which serve as natural climbing aids and give the plants support.
  • Beans also make a good mixed crop with zucchini plants, because as nitrogen fixers they add valuable nutrients to the soil. The highly nutritious zucchini can benefit from this and the soil is not depleted. Runner beans and field beans are particularly suitable for this. Bush beans compete for space due to their bushy growth habit.
  • A traditional mixed crop with zucchinis is the milpa. In a milpa, pumpkin plants, i.e. squash, melon or zucchinis, are grown together with beans and maize. Sunflowers can also be planted instead of corn, as both corn and sunflowers are a natural climbing aid for the beans and possibly climbing zucchini.
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Plant zucchini next to tomatoes?

It is generally possible to grow nightshade plants such as aubergines, peppers and tomatoes together with zucchinis. These crops belong to different plant families, but have similar nutrient requirements and need a lot of light. If you were to decide according to location and soil requirements, these crops would go well together. However, tomatoes and peppers require more heat than zucchini plants. This is why tomatoes and peppers are often grown in greenhouses. Zucchini plants, on the other hand, are quite robust and thrive even at moderate temperatures. In greenhouses, however, they are more susceptible to fungal diseases. If you opt for a mixed culture with zucchinis and tomatoes, peppers or aubergines, you should leave enough space between the plants to ensure good air circulation. This will reduce the risk of your plants being attacked by mildew.

In general, nightshade plants such as peppers, tomatoes and aubergines can be grown next to zucchinis. Just make sure that all plants have enough space, light and nutrients. However, potatoes are the exception here and are less suitable for growing next to zucchini plants.

Which herbs go well with zucchinis?

Herbs are companion plants to prevent diseases and pests. They keep various pests away with the scent of their essential oils. At the same time, they attract beneficial insects to your bed and garden with their flowers. This in turn contributes to a healthy ecosystem that regulates itself and makes chemical pesticides superfluous.

  • Basil goes well next to zucchinis. On the one hand, it keeps mildew away from your zucchini plants. It is also effective against pests such as whiteflies and aphids.
  • Borage is not only a good companion plant for cucumbers. Borage also goes well next to zucchinis and protects its neighbors from tomato worms and cabbage white butterflies. In addition, its bright blue flowers cannot be overlooked by any insect.
  • Marigolds are known to reduce and keep away nematodes and wireworms in the soil, which can cause root damage or disease. If there are still beans in the bed, they will benefit from the preventative effect of marigolds against the bean aphid.
  • Chamomile also has a positive effect on zucchini plants, as it is said to improve growth and contribute to plant health. Companion planting with camomile increases your yield. The same applies to oregano.
  • Parsley is also a companion plant. On the one hand, it has a preventative effect against fungal diseases such as mildew. On the other hand, parsley improves the aroma and growth of vegetable plants.

Zucchinis: antagonistic plants

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Antagonistic plants for zucchini can have a negative impact on plant growth and health. To promote the health and growth of zucchini plants, it is advisable to avoid these and instead choose plants that support each other and create a healthy, balanced ecosystem in the garden.

  • Radishes and potatoes are unsuitable neighbors for zucchini, as they have similar nutritional requirements and compete with each other, which can lead to poorer growth of both plants. Potatoes can also spread diseases such as late blight, which can also affect zucchinis.
  • Cucumbers and pumpkins should not be planted next to zucchinis as they belong to the same family (Cucurbitaceae) and therefore attract similar pests and diseases. These can spread more easily when related plants are planted close together.
  • Lovage and Jerusalem artichokes are also unfavorable neighbors for zucchini. Lovage, also known as Maggi herb, is a vigorous herb that overgrows other plants and can take away their light and space to grow. Jerusalem artichoke, on the other hand, has aggressive root growth that can affect other plants, including zucchinis.

Are zucchini and pumpkin or cucumbers companion plants?

Planting zucchinis and other cucurbits such as pumpkins or cucumbers next to each other can encourage the occurrence of diseases and pests, as they belong to the same plant family (Cucurbitaceae). If you plant these plants close together, you create an environment in which pests and diseases can spread more easily. Instead, you should aim for diverse planting with a varied crop rotation and mixed cultivation.

Some pests that are common in pumpkin plants include pumpkin flies, aphids, whiteflies, spider mites, cucumber beetles and the larvae of the pumpkin seed weevil. Diseases that often affect pumpkin plants include mildew (powdery and downy), viral infections such as the zucchini yellow mosaic virus, bacterial wilt and various fungal infections such as root rot or Fusarium wilt. Planting zucchinis and other cucurbits next to each other can increase the risk of these pests and diseases spreading to all neighboring plants and causing major damage.

Table: What goes well with zucchinis?

Companion Plants (Vegetables) Companion plants (Herbs & Flowers) Antagonistic plants
Beans (runner beans & field beans) Basil Cucumbers
Spring onions Borage Potatoes
Leek Camomile Pumpkin
Maize Oregano Lovage
Carrots Parsley Radish
Beetroot Marigold Jerusalem artichoke
Lettuce Sunflowers

Your companion planting plan with zucchinis

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In this mixed culture, the zucchini plant is accompanied by root vegetables such as carrots and beet. To prevent pests and diseases, various herbs are planted right next to the zucchini. Parsley and basil keep mildew at bay. Borage attracts pollinating insects and other beneficial insects. There are also two dill plants between the carrots. Dill not only goes very well with zucchinis in terms of taste, but also helps the carrots to germinate. The winter hedge onions are in the bed all year round and can be harvested. There is also a row of lettuce planted, between which you can plant garlic in late summer.

Succession cropping and crop rotation

Succession cropping and crop rotation are important practices in the vegetable garden. If you observe succession cropping and crop rotation rules when planning your beds, you will promote and maintain soil fertility and plant health in your garden. Rotating between plant families helps to ensure that no crop-specific pathogens or pests become established in the bed. Particularly with high-yielding plants such as zucchinis, you can prevent soil fatigue through sensible crop rotation.

Succession cropping with zucchinis

Succession cropping refers to the sequence of pre-crop, main crop and post-crop within a year. As the heat-loving zucchini plant is only in the bed during the summer months, you can plan pre-crops and post-crops. You should avoid plants from the same family. However, as it is too cold for pumpkin plants in our latitudes in winter anyway, this is not possible. Choose cold-tolerant plants such as radishes, spinach, kohlrabi, peas or lettuce. The pre-crops should have a short cultivation period and make room in the bed again by May. Subsequent crops for the winter can remain in the bed for longer and you can plant garlic or onions, for example. Alternatively, you can also sow a green manure to give the soil a break. In general, you should not choose heavy eaters in the crop rotation after zucchinis, as this can deplete the soil.

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Our tip: If your mixed crop and crop rotation is quite diverse, you can also plant bad neighbors together in the same bed. For example, radishes and spring onions are not ideal bed partners. However, the radishes only serve as marker seeds for the carrots and make room in the bed again until the winter spring onions and carrots really start to grow.

Crop rotation

Crop rotation, on the other hand, considers the succession of main crops over several years and is a decisive factor in reducing diseases, pests and soil fatigue. After a member of the pumpkin family (pumpkin, cucumber, melon or zucchini) has grown on a bed (or part of a bed), a cultivation break of 4 years should follow until the next pumpkin crop.

More ideas for companion planting plans with courgettes

For more inspiration for bed planning, you can find more bed plans with courgettes here. Remember: courgette plants are very productive and one or two plants are usually enough to feed a family of four.

If you have any questions or comments, please write to us at [emailprotected]. Would you like to receive helpful gardening tips all year round and plan your own beds optimally? Then register here or download the Fryd app for Android or iOS.

Fryd - your digital bed planner

Fryd (2024)


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