Can you plant leeks and cabbage together?

Yes. Leeks and cabbage grow well together. A shared bed gave about 16% more harvest than separate beds in one field trial. That rests on a single study, so treat it as a lead, not a rule.

Why leeks and cabbage work together

More harvest from the same bed. In one field trial, a bed with both crops gave about 16% more harvest than the same space split into a cabbage bed and a leek bed.
White Cabbage Productivity in Intercropping Production Systems (Bavec · 2012)

What to plant with leeks and cabbage

Good neighbours of both, best tested first.

CeleryWith leeks: 19% more harvestWith cabbage: 27% more harvest
TomatoWith leeks: Less diseaseWith cabbage: 34% more harvest
CarrotWith leeks: Recommended by garden charts, not testedWith cabbage: 19% more harvest
OnionWith leeks: Recommended by garden charts, not testedWith cabbage: 8% more harvest

How each one was tested, with the evidence

What to keep away from leeks and cabbage

Swiss chardWith leeks: Garden charts advise against it, not tested

The evidence in detail

For readers who want to dig in: every chart entry, study and yield trial behind the answer above, with the numbers.

Tradition, research and yield trials

Tradition

No chart mentions this pair.

Research

No papers found on this pair.

Yield trial

Good

No per-crop split reported in these trials.

1 field trial. Published LERs lean high.

Good neighbours

What happens above and below ground

Each animation illustrates a mechanism a study reported for this pair. Pick a card to focus on it.

Everything at once.

Companion plants for both leeks and cabbage

Plants that are good neighbours of each. Biggest harvest gain first; each cell links to the evidence for that pair.

Plant	With leeks	With cabbage
Celery	Less competition19% more harvest from the same spaceField trial, 2 studies. Charts: recommend.Evidence for leeks and celery	27% more harvest from the same spaceField trial, 1 study. Charts: recommend.Evidence for cabbage and celery
Tomato	Less disease and better soil and nutrient uptakeGreenhouse or pot trial, 2 studies. Charts: recommend.Evidence for leeks and tomatoes	34% more harvest from the same spaceField trial, 4 studies. Charts: not listed.Evidence for cabbage and tomatoes
Carrot	No trial foundNot tested. Charts: recommend.Evidence for leeks and carrots	19% more harvest from the same spaceField trial, 1 study. Charts: not listed.Evidence for cabbage and carrots
Onion	No trial foundSame family (Amaryllidaceae): shares pests and diseasesNot tested. Charts: recommend.Evidence for leeks and onions	Fewer pests and draws in pest-eating insects8% more harvest from the same spaceField trial, 8 studies. Charts: recommend.Evidence for cabbage and onions

Harvest from the same space compares a bed with both crops against the same area split into single-crop beds, counting the harvest of both crops (the land equivalent ratio in yield trials).

The evidence, with sources

Yield trialGood1 entry

GoodLER 1.16field trial

Slovenia, 2007-2009; Additive design; median LER 1.16 over 1 treatment(s) · partial LER Cabbage 0.8
White Cabbage Productivity in Intercropping Production Systems (Bavec · 2012)

Plan a bed with leeks and cabbage

All neighbours of leek and of cabbage, or every pair at once in the companion planting chart.

Have you grown leeks and cabbage together?

Tell other gardeners what happened: spacing, pests, harvest, or ask a question. Reader notes are not checked by us and do not change the verdicts on this page.