Onions are shallow growers, making them excellent companions to deep rooted vegetables. The best onion plant companions are members of the cabbage family because onions naturally repel pests that love cabbage family plants, such as cabbage loopers, cabbage worms, and cabbage maggots. Cabbage family plants include:
  • Broccoli
  • Kale
  • Brussel Sprouts
  • Cabbage
  • Kholrabi

Onions deter aphids and Japanese beeltes which means you can use them as companions to plants that often suffer from these pests.

Other companions to onions include:

  • Tomatoes
  • Lettuce
  • Spinach
  • Beetroot
  • Strawberries
  • Peppers
  • Celery
  • Carrots
  • Chamomile
  • Dill
  • Parsley

Onions Dislike

  • All varieties of peas and beans
  • Sage
  • Asparagus

When you plant onions around vegetable companions, scatter the onion plants to minimize infestation by onion/garlic pests such as onion maggots.  Experiment with different combinations and arrangements of companion plantings as borders and backdrops as well as interplanting.

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