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Companion planting

Leek Companion Plants

Beneficial and avoid companions for Leek, aggregated from open plant-variety notes (pest deterrence, soil sharing, and flavour).

Adapted from Wind River Greens Plant Variety Database (CC BY 4.0) — 44 varieties in allium. Credits

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Plant together

Companions often recommended near Leek.

  • Carrots (44)

    Alliums deter carrot rust fly while carrots help break up soil for allium bulbs Onions deter carrot flies while carrots help break up soil for bulb development

  • Lettuce (44)

    Alliums repel aphids and rabbits that damage lettuce crops Alliums provide natural pest control against aphids and slugs without competing for nutrients

  • Strawberries (44)

    Alliums deter slugs, aphids, and nematodes while not competing for nutrients Alliums repel slugs, aphids, and nematodes that commonly damage strawberry plants

  • Tomatoes (44)

    Alliums repel aphids, whiteflies, and spider mites that commonly attack tomatoes Alliums repel aphids and spider mites that commonly attack tomatoes

  • Peppers (42)

    Alliums deter aphids, spider mites, and may help repel pepper maggots Onions deter aphids and may improve pepper flavor and growth

  • Roses (34)

    Alliums repel aphids, thrips, and other pests that commonly attack roses Alliums repel aphids, thrips, and may help reduce black spot and other fungal diseases

  • Cabbage (25)

    Onions repel cabbage worms, flea beetles, and other brassica pests Garlic deters cabbage worms, aphids, and flea beetles that commonly attack brassicas

  • Marigolds (19)

    Both plants repel similar pests and marigolds may enhance allium's pest-deterrent properties Both repel nematodes and create a pest-deterrent barrier when planted together

  • Spinach (13)

    Compatible root depths and leeks help repel leaf miners Garlic protects against leaf miners and aphids while spinach provides ground cover

  • Brassicas (Cabbage, Broccoli) (10)

    Leeks repel cabbage worms and flea beetles that commonly attack brassicas Onions repel cabbage worms, flea beetles, and other brassica pests

  • Parsley (10)

    Both herbs complement each other and don't compete for growing space Attracts beneficial insects and doesn't compete with onions for nutrients

  • Brassicas (8)

    Alliums repel cabbage worms, flea beetles, and aphids that damage cabbage family plants Onions deter cabbage worms, flea beetles, and aphids from cabbage family plants

  • Broccoli (8)

    Onions deter cabbage loopers and aphids that commonly attack brassicas Onions help protect against cabbage moths and root maggots that target brassicas

  • Celery (2)

    Both have similar growing requirements and leeks help repel celery leaf spot Both have similar water needs and leeks help repel celery leaf miner

  • Apple Trees (1)

    May help prevent apple scab and deter aphids from fruit trees

  • Brassicas (Cabbage/Broccoli) (1)

    Alliums repel cabbage worms, aphids, and flea beetles that attack brassicas

  • Cucumber (1)

    Onions repel cucumber beetles and other pests while not competing for nutrients

  • Cucumbers (1)

    Alliums deter cucumber beetles and aphids while improving overall plant health

  • Fruit Trees (1)

    Acts as living mulch and deters boring insects at tree base

Keep apart

Combinations often avoided near Leek.

  • Beans (44)

    Onions can inhibit bean growth and nitrogen fixation by rhizobia bacteria Onions can inhibit bean growth and nitrogen fixation by interfering with beneficial root bacteria

  • Peas (44)

    Alliums can stunt pea growth and interfere with their nitrogen-fixing capability Onions stunt pea growth and can reduce their ability to fix nitrogen effectively

  • Asparagus (41)

    Onions may inhibit asparagus growth and can compete for similar soil nutrients Onions can inhibit asparagus spear development and overall plant vigor

  • Sage (6)

    Both are strong-scented herbs that can compete and reduce each other's essential oil production Both plants compete for similar nutrients and sage can inhibit onion bulb development

FAQ: companion planting with Leek

What are good companion plants for Leek?

Frequently cited companions include Carrots, Lettuce, Strawberries, Tomatoes, Peppers, Roses, Cabbage, Marigolds, Spinach, Brassicas (Cabbage, Broccoli), Parsley, Brassicas. Reasons come from open cultivar notes (pest deterrence, soil, flavour).

What should I avoid planting near Leek?

Often avoided: Beans, Peas, Asparagus, Sage.

Companion effects vary by climate, soil and variety. Confirm with local extension. Data adapted from Wind River Greens Plant Variety Database (CC BY 4.0).