What companion plants should be avoided near kale?

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Written by

Paul Reynolds
Published: January 30, 2026
Updated: January 30, 2026

Choosing the right neighbors for your kale will prevent potential growth problems and pest issues. Some plants are greedy feeders that will compete with your kale for nutrients, and some will attract insects that love to munch on your greens. I've been experimenting with companion planting for years and have seen which plants are winners and losers. Some wise pairings can significantly increase your harvest.

Tomatoes

  • Problem: Nutrient competition for calcium
  • Effect: Stunted kale growth
  • Distance: Keep 36 inches (90 cm) apart
  • Alternative: Plant with basil instead

Strawberries

  • Problem: Attracts slugs to both plants
  • Effect: Leaf damage and reduced yields
  • Distance: Minimum 24 inches (60 cm)
  • Alternative: Pair with borage for benefits

Pole beans present special problems next to kale. They are competing for nitrogen in the soil, and they grow allelopathic chemicals that stunt the root development of the kale plants. I keep them on different sides of the garden. Plant bush beans instead; they fix nitrogen and do not harm the kale. Proper spacing of crops will eliminate most of these problems.

Companion Planting Guide
Bad CompanionPole BeansProblem CreatedNitrogen competitionRecommended AlternativeBush beans
Bad CompanionTomatoesProblem CreatedCalcium depletionRecommended AlternativeBasil
Bad CompanionStrawberriesProblem CreatedSlug attractionRecommended AlternativeBorage
Rotate crops annually to prevent soil depletion and disease buildup

Both beneficial companions protect kales by Nature's Goodwill. Mint repels cabbage worm, so I thin it out about the kale beds. Onions allay aphids with their foul breath. Beets are good space partners and do not quarrel over one another's food. Kale specimens grown at home are fresher in flavor and seldom troubled with labourers.

Mint & Thyme

  • Benefit: Repels cabbage worms
  • Planting: Edge of kale bed
  • Tip: Contain mint to prevent spreading
  • Effect: Reduces pest damage by 70%

Onions & Garlic

  • Benefit: Deters aphids and flea beetles
  • Planting: Between kale plants
  • Tip: Harvest when tops yellow
  • Effect: Creates protective barrier

Apply these methods to achieve great success. Space your plants the recommended distance apart. I like to rotate crops annually to minimize the risk of disease. I check for pests regularly, usually once a week. Your kale will sing with companions. Get growing.

Read the full article: When to Plant Kale: Expert Timing Guide

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