Garlic Companion Plants
Allium sativum · allium family · rotation group: allium
The best companion plants for garlic are Carrot, Beet, Spinach, Strawberry, and Lettuce. Avoid planting garlic near Pea, Bean, Onion. Of the 11 pairings recorded here, 1 is supported by published research and 9 are traditional practice with no controlled evidence behind them.
What to plant with garlic
| Plant | Claimed benefit | Evidence | What the evidence actually shows |
|---|---|---|---|
| Carrot | Interplanting alliums with carrots reduces carrot rust fly damage. | Research-backed | Uvah and Coaker's field work is the most-cited support and reported real reductions, but later analysis attributes the effect to disrupted host-plant selection rather than repellent odour, and marigold intercrops tested the same way failed to reduce carrot fly at all. |
| Beet | Beets and garlic occupy the bed at different times and root at different depths. | Traditional | A scheduling convenience only; garlic occupies the ground from autumn to midsummer, leaving room for a spring beet sowing alongside. No measured interaction. |
| Chamomile | Chamomile is said to improve garlic's flavour and vigour. | Traditional | No evidence of any kind was found for a flavour or vigour effect; this is folklore, though the flowers do genuinely feed beneficial insects. |
| Lettuce | Lettuce interplanted with garlic uses the space between rows during garlic's slow spring growth. | Traditional | Spatial only; no evidence of any pest or growth benefit in either direction. |
| Spinach | Spinach fills the row between overwintered garlic in early spring before garlic bulks up. | Traditional | Sound use of space with no biological claim attached; sources for a pest or growth benefit were not found. |
| Strawberry | Garlic planted through a strawberry bed is said to reduce fungal disease and pest pressure. | Traditional | Widely repeated in garden literature with no controlled field evidence found; garlic extracts do show antifungal activity in vitro, which is not the same as protecting a neighbouring plant. |
| White Clover | A low clover cover between garlic rows suppresses winter weeds and shelters ground predators. | Traditional | Living mulch reducing pest colonization is demonstrated in brassicas, not in alliums; garlic is a poor competitor and clover must be kept well back from the rows. |
| Tomato | Garlic is claimed to repel spider mites and aphids from tomatoes. | Not supported | The one controlled test located — leek grown as a companion to sweet pepper — found allium volatiles disrupted aphid feeding but increased aphid survival from 65% to 91% and raised fecundity, and the authors concluded the allium was unsuitable for pest management. Allium 'repellency' toward sap-feeders should not be assumed. |
What not to plant with garlic
| Plant | Claimed problem | Evidence | What the evidence actually shows |
|---|---|---|---|
| Bean | Garlic is claimed to stunt beans and kill the bacteria they need to fix nitrogen. | Traditional | The 'allicin kills rhizobia' explanation circulates widely without a cited study behind it; treat this pairing as unproven folklore rather than established antagonism. |
| Onion | Other alliums share garlic's white rot, basal rot and onion maggot problems. | Traditional | The rotation concern is real and extension explicitly advises a four-year gap between allium crops because white rot sclerotia persist for years; that is rotation guidance rather than a tested adjacency effect. |
| Pea | Alliums are said to suppress pea growth and interfere with rhizobial nodulation. | Traditional | Repeated in every companion chart, but the sources are garden guides rather than trials; allium allelochemicals do inhibit seedlings in laboratory assays, and no field study confirming garden-scale suppression of peas was found. |
The honest verdict
Of everything gardeners recommend planting alongside garlic, 1 pairing has been tested properly: Carrot. Those are the ones worth planning your bed around.
The remaining 6 pairings on this page are traditional practice. They circulate on every companion planting chart online, but we could not find controlled evidence testing them. They are not wrong so much as unverified — most cost nothing to try, and interplanting flowers and herbs has its own well-documented benefit of pulling pollinators and predatory insects into the garden.
Widely repeated, not supported: Tomato — The one controlled test located — leek grown as a companion to sweet pepper — found allium volatiles disrupted aphid feeding but increased aphid survival from 65% to 91% and raised fecundity, and the authors concluded the allium was unsuitable for pest management. Allium 'repellency' toward sap-feeders should not be assumed.
Every row above links to the publication it came from. See how we grade evidence.
Growing garlic: the numbers
| Sun | Full sun (6+ hours) |
|---|---|
| Water | Moderate |
| Spacing | 5 in apart · 12 in between rows · 4 per square foot |
| Mature size | about 24 in tall |
| Soil pH | 6–7 |
| Days to maturity | 240–270 days |
| Frost tolerance | Hardy — takes hard frost |
| Containers | Yes — 5 gallon minimum |
| Typical yield | 1 bulb per clove planted (10-15 cloves per bulb) |
| Common pests | onion thrips, onion maggot, allium leafminer, wireworms, cutworms |
| Common diseases | white rot, Fusarium basal rot, Botrytis neck rot, purple blotch, pink root |
When to plant garlic
Zone 6b shownFall planting: Oct 27 – Nov 9 — 0 weeks before your first fall frost
Those dates are for zone 6b. Get your own dates by ZIP code →
Varieties worth knowing
bulbs for planting- Music — hardneck porcelain type, very cold hardy, large easy-peel cloves
- German Extra Hardy — hardneck porcelain, among the most winter-hardy, strong flavour
- Spanish Roja — hardneck rocambole, rich classic garlic flavour, shorter storage
- Inchelium Red — softneck artichoke type, mild, braidable, long storage, better in mild winters
Variety names link to bulbs for planting on Amazon. As an Amazon Associate we earn from qualifying purchases. These are the varieties named in the extension sources for this crop, not a paid placement — where a source recommended a variety for a specific reason, that reason is the note beside it.
Put it in a bed
The garden planner checks every square against this ledger as you place crops — if you drop garlic next to something recorded as a bad neighbour, the square turns red and tells you why.
Records for the plants named above:
Same rotation group (allium) — don't follow one with another:
Garlic companion planting questions
What should not be planted next to garlic?
How far apart should garlic be planted?
Does companion planting with garlic actually work?
When should I plant garlic?
Sources for this record
- Growing garlic in home gardens — University of Minnesota Extension
- Garlic Production — Penn State Extension
- Garlic Production for the Gardener (C854) — University of Georgia Extension
- How to Grow Garlic in Your Garden — Utah State University Extension
- Planting and Growing Garlic — University of Illinois Extension
Record compiled 2026-07. Spot an error or a study we missed? Tell us and we'll correct the entry.