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What to Plant With Garlic: Roses, Carrots and Brassicas

Garlic sits in the ground nine months, so companions have to work around its timing. What pairs well, and the two families to keep away from it.

By Zakaria 3 min read Save to Pinterest — opens Pinterest in a new tab
A garlic plant growing in a narrow strip of soil between brick paths, sharing the bed with a succulent and flowering plants
Photo: SYFTV1, CC0, via Wikimedia Commons
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The thing that decides this is timing, not chemistry. Autumn-planted garlic sits in the ground until midsummer — most of a growing year — but occupies a narrow strip and casts almost no shade. The best companions are crops that use the space it leaves.

Two different reasons a companion works

Deterrence against space
CompanionWhy it works
RosesSulphur compounds deter aphids
CarrotsInterferes with carrot root fly’s scent tracking
BrassicasCabbage moth deterrence
TomatoesAphids and mites, modestly
Lettuce, spinach, radishFast crops using the empty spring bed
StrawberriesSpread as the garlic matures and is lifted

Timing is the part that gets skipped

Garlic planted in autumn is lifted the following July. That is a long occupation of a bed — but:

  • It grows upright and narrow
  • It casts almost no shade
  • The bed has usable space and light all spring

So the most productive companions are simply fast crops sown between the rows in spring. You get two harvests from ground that would otherwise sit half-empty.

What to keep away

Beans and peas are the one with real evidence behind it

Alliums appear to interfere with the rhizobia bacteria that let legumes fix nitrogen. Both crops do less well for the pairing.

This is the better-documented half of garlic companion lore — most of the rest is softer than it is usually presented.

Other alliums — onions, leeks, shallots, chives — for a different reason:

  • They share every pest and disease garlic has
  • White rot is a soil fungus that persists for years
  • Grouping them concentrates the risk and complicates rotation

On the pest-repelling claim

It is real, and it is smaller than the lore suggests.

Garlic’s sulphur compounds genuinely interfere with how some insects locate host plants — that is why the rose-and-garlic pairing keeps being recommended, and it does help a little.

It is not pest control. A garlic border will not clear an aphid infestation, and expecting it to is how people conclude companion planting does not work at all.

What follows garlic

Lifting in July leaves warm soil and half a season:

  • Bush beans (now that the garlic is gone)
  • Salad leaves
  • Autumn brassicas
  • A green manure to hold the bed over winter

Three to four years before any allium returns to that ground

This is the standard interval for avoiding white rot, and it is the reason to keep alliums spread across beds rather than grouped in one.

Common questions

What should you plant with garlic?

Roses, carrots, brassicas, strawberries, tomatoes and lettuce all pair well, for two different reasons. Roses, carrots and brassicas benefit from garlic's sulphur compounds, which deter aphids, carrot root fly and cabbage moths to a modest degree. Lettuce and other fast salad crops work simply because garlic occupies a narrow strip of ground for nine months and leaves most of the bed's space and light unused until early summer.

What should you not plant with garlic?

Legumes — beans and peas — and other alliums. The legume objection is the better documented of the two: alliums appear to interfere with the rhizobia bacteria that let beans and peas fix nitrogen, so both crops do less well together. Onions, leeks, shallots and chives should be separated for a different reason, which is that they share every pest and disease garlic has, including white rot, so grouping them concentrates the problem.

Does garlic actually repel pests?

Modestly, and the effect is real but smaller than companion-planting lore suggests. The sulphur compounds garlic releases do interfere with how some insects locate host plants, which is why the rose and aphid pairing keeps being recommended and why it does help a little. It is not a substitute for anything — a garlic border will not clear an aphid infestation, and treating it as pest control rather than a small bonus leads to disappointment.

Can you plant garlic and onions together?

You can, and nothing dramatic happens, but it is poor practice for disease reasons rather than competition. Every allium shares the same pest and disease list, and white rot in particular is a soil fungus that persists for years, so planting them together concentrates risk and complicates rotation. Keeping alliums in one block also makes it harder to leave the required gap before growing any of them on that ground again.

How does garlic's long season affect companion planting?

It is the thing that actually decides what works. Garlic planted in autumn sits in the ground until the following midsummer, which is most of a growing year, but it occupies a narrow upright strip and casts almost no shade. That means the bed has usable space and light all spring, and the best companions are simply crops that exploit it — lettuce, spinach and radish sown between the rows, or strawberries that fill out as the garlic matures.

What should follow garlic in the bed?

Anything that is not an allium, and ideally something that appreciates a bed cleared in midsummer. Lifting garlic in July leaves warm soil and half a season, which suits a fast crop such as bush beans, salad leaves, autumn brassicas or a green manure sown to hold the bed over winter. Do not grow any allium on that ground again for three to four years, which is the standard interval for avoiding white rot.

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