Written by TagTomat 05 Apr 2022 11:32

Good companion plants and mixed crops in the greenhouse

Prevent plant diseases and pests in the greenhouse by planting the right crops in proximity to each other.

Now that the greenhouse season has started, many of you have probably begun to think about how to arrange the greenhouse plants. Therefore, we think it is a good time to look at which plants thrive well next to each other, and which plants should be placed with some distance in the greenhouse. Because not all plants are equally beneficial for each other.

Why think about good companion plants and mixed crops in the greenhouse?

There are several benefits to arranging the greenhouse based on which plants are beneficial for each other. In addition to optimizing greenhouse space, good companion plants promote growth by providing energy and nutrients for each other, and by preventing plant diseases and pests.

Good companion plants don't just have to be other vegetables but can also include different plant species such as flowers, herbs, and vegetables - also called mixed cropping. Especially flowers and umbelliferous herbs help keeping pests away, while marigolds, borage, clover, etc., help improving the soil in the greenhouse.

Benefits of planting good companion plants and mixed crops in the greenhouse:


  • Good companion plants can naturally provide each other with nutrients.
  • Better utilisation of water and nutrients in the soil.
  • You can better utilise the cultivation area in the greenhouse and thus optimize the harvest.
  • Acts as ground cover, reducing evaporation and helping against weeds.
  • Reduces plant diseases and pests in the greenhouse.
  • Increases microorganisms in the soil and insect life.
  • Increases crop productivity.

If you would like to learn more about which plants thrive particularly well next to each other in order to make the best plan for your greenhouse, you can take a look at the overview below.


Good and bad companion plants in the greenhouse

If you are new to companion planting and mixed crops, it can be a bit of a puzzle to figure out which plants are good for each other. With inspiration from several garden sites and our own cultivation experience, we have compiled a list of which plants are good and bad companion plants for some of the classic greenhouse plants.


Plant species 

Good companion plants 


Bad companion plants 



Marigolds, basil, coriander, dill, calendula, nasturtium, bush beans, lettuce, spinach

Cucumber, melon, peas, fennel, potatoes 

Cucumber and melon

Marigolds, basil, coriander, dill, cumin, beans, lettuce, nasturtium

Tomato, radish, potato 

Bell pepper and chili

Marigolds, basil, dill, oregano, parsley, rosemary, squash, eggplant, cucumber 

Tomato, fennel, beans, cabbage 


Marigolds, basil, coriander, thyme, catnip, nasturtium, lettuce, bell pepper, bush beans 


Courgette / Squash

Dill or fennel, oregano, parsley, nasturtium, calendula, clover, borage, amaranth, pole beans 

No immediate bad companion plants 


Cabbage, radish, radish, celery, pole bean, tomato 

No immediate bad companion plants 


Dill, fennel, cress, mint, thyme, chervil, red clover, cabbage, bean, radish, tomato, cucumber 

Celery, parsley 


Marigold, coriander, dill, chamomile, rosemary, sage, wormwood, cumin, mint, clover, calendula, bean, beetroot, celery, head lettuce, loose-leaf lettuce, spinach, tomato 

Tomato, pole bean, strawberry, garlic, yellow mustard 

As you may have noticed, coriander, basil, and marigold are among the plants that are good to grow with most greenhouse plants, especially tomato, cucumber, and melon. So, if it seems somewhat overwhelming to make a greenhouse plan based on optimal companion plants, it's a good start to introduce these into the greenhouse.

Marigold is generally a really good flower to grow in the greenhouse with your other crops. In addition to being a beautiful edible flower, it can prevent soil fatigue and nematodes, and with its somewhat special "scent," it can scare off annoying pests.