Leek deters celery fly; celery deters leek moth.
Allium porrum
Allium porrum grows best when paired with plants that repels pests. We've catalogued 2 beneficial companions Every pairing below cites its mechanism — pest deterrence, nitrogen fixing, allelopathy, or shared disease.
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Leek deters celery fly; celery deters leek moth.
Leeks and carrots confuse each other's specialist flies.
Strong aromatics like basil, garlic, and marigold mask the olfactory cues that pests use to find their target crop.
The top companions are Celery, Daucus carota. See above for the full list with mechanisms.
Aromatic companions deter many pests through scent masking and alarm pheromones. Effect varies by pest species and density — most effective as part of a polyculture, not a one-plant solution.
Some mechanisms are well-documented (legume nitrogen fixation, allelopathy in walnut and fennel, nematode suppression by marigolds). Others are traditional pairings with anecdotal support. We cite both, but mark mechanism strength where available.
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