What To Grow With Onions: Companion Plants For A Successful Garden

Growing Onions from Seed to Harvest Squire's Garden Centres
Growing Onions from Seed to Harvest Squire's Garden Centres from www.squiresgardencentres.co.uk

Growing onions in your garden can be a rewarding experience. Not only are they a versatile and flavorful addition to many dishes, but they are also relatively easy to grow. However, to maximize the yield and health of your onion plants, it is important to consider which plants make good companions for onions. Companion planting, the practice of strategically planting different crops together, can help improve pest control, increase pollination, and enhance nutrient uptake.

Benefits of Companion Planting with Onions

Companion planting with onions offers several benefits:

  • Pest control: Onions have natural pest-repelling properties that can deter pests such as aphids, carrot flies, and cabbage worms. Planting onions near susceptible crops can help protect them from these pests.
  • Pollination: Onions belong to the allium family, which includes chives, garlic, and leeks. These plants produce attractive flowers that can attract pollinators such as bees and butterflies, benefiting other plants in your garden.
  • Space utilization: Onions have a relatively small footprint, so planting compatible crops alongside them can help maximize the use of space in your garden.
  • Complementary growth habits: Some plants can provide shade or act as a trellis for onions, enhancing their growth and yield.
  • Complementary nutrient needs: Companion plants with different nutrient requirements can help improve soil fertility by reducing competition for specific nutrients.

Companion Plants for Onions

When choosing companion plants for onions, it is important to consider their compatibility and mutually beneficial characteristics. Here are some plants that pair well with onions:


Onions and carrots are a classic companion planting combination. Carrots help repel onion flies, while onions deter carrot flies. Additionally, the tall, upright growth of onions provides some shade for the delicate carrot seedlings, helping to keep the soil cool and moist.


Tomatoes and onions are not only great companions in the kitchen but also in the garden. Onions can help repel pests such as aphids and thrips that commonly affect tomato plants. In return, the tall foliage of tomato plants can provide shade for onions, preventing them from bolting in hot weather.


Planting lettuce alongside onions can help maximize space utilization in your garden. Lettuce has shallow roots, which makes it an ideal companion for the deep-rooted onions. The lettuce leaves can provide some shade for the onion bulbs, preventing them from greening and becoming bitter.


Beets and onions make good companions as they have different nutrient requirements. Onions are heavy feeders, requiring a steady supply of nitrogen, while beets prefer a potassium-rich soil. By planting these two crops together, they can help reduce competition for specific nutrients and improve overall soil fertility.


Chamomile is a beneficial herb that attracts pollinators and repels pests such as aphids and cabbage worms. Planting chamomile near onions can help improve pollination and protect the onion plants from common pests.

Tips for Successful Companion Planting with Onions

To ensure successful companion planting with onions, consider the following tips:

  • Plant companion crops at the same time as your onions to establish a harmonious growing environment.
  • Leave enough space between plants to allow for proper air circulation and prevent overcrowding.
  • Avoid planting onions near other allium family members, such as garlic and shallots, as they may compete for resources.
  • Rotate your crops annually to prevent the buildup of pests and diseases.
  • Monitor your garden regularly for any signs of pests or diseases and take appropriate action if necessary.


Choosing the right companion plants for your onions can greatly enhance the health and productivity of your garden. By considering factors such as pest control, pollination, and nutrient needs, you can create a harmonious growing environment that benefits all your plants. Whether it’s carrots, tomatoes, lettuce, beets, or chamomile, there are plenty of options to choose from when it comes to companion planting with onions. So, get creative, experiment in your garden, and enjoy the benefits of a thriving onion crop!

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