Can Beets And Onions Be Planted Together? | A Smart Pairing

Many gardeners assume root vegetables should be kept apart, worried they’ll compete for space and nutrients under the soil. That instinct makes sense — carrots and parsnips are fairly neutral together, but pairing beets with onions actually works better than most root‑on‑root combinations.

The honest answer is that beets and onions support each other. Onions help repel common beet pests, and their different root zones mean they don’t crowd each other out. This article explains why the pairing works, what conditions both crops need, and how to plant them for the best results.

The Case for Planting Beets and Onions Together

Beet roots develop underground, while onion bulbs grow near the surface with shallow, fibrous roots. That difference in root depth means they aren’t competing for the same water and nutrients at the same depth. Gardeners at Grow Organic note that this different root zone arrangement is a key reason the two crops coexist well.

Onions also offer a practical pest‑control benefit. Their strong scent is thought to mask the smell of beet leaves, making it harder for aphids, flea beetles, and cutworms to locate their preferred host. The Old Farmer’s Almanac lists beets and onions as a mutually beneficial pairing, alongside carrots, cabbage, and lettuce.

What Makes a Good Companion?

Companion planting isn’t an exact science, but the logic behind beets and onions is simple: they neither harm nor overshadow each other, and they actively reduce pest pressure. That’s more than many vegetable pairings can claim.

Why This Pairing Makes Sense (And Why It Surprises Some Gardeners)

It’s easy to picture root vegetables tangling underground, but beets and onions have different growth habits. Beetroots are taproots that push deeper, while onion bulbs stay near the top with a shallow web of roots. That vertical separation reduces direct competition.

• Pest deterrence: Onion scent masks beet aroma, making it harder for pests to find beets. Gardenary’s guide on companion beets explains this mechanism clearly.
• No shade competition: Onions grow upright with narrow leaves; beet tops are bushy but low. Neither blocks sunlight from the other.
• Shared soil preferences: Both crops thrive in loose, well‑draining soil with a neutral pH around 6.0–7.0.
• Mutual benefit: Beets are also listed as good companions for onions, so the relationship works both ways — each can help reduce pest stress for the other.

Gardening resources from the Old Farmer’s Almanac to Solara agree: this is one of the most reliable pairings for a small vegetable bed.

Shared Growing Conditions: What Beets and Onions Need

Both beets and onions prefer full sun — at least six hours of direct light daily — and loose, well‑draining soil. They also appreciate consistent moisture, especially during bulb and root formation. The Solara gardening guide notes these overlapping needs, including full sun and well‑draining soil — see its beets onions compatible needs page.

Below is a quick comparison of their growing requirements. These are general guidelines; your local extension office can fine‑tune them for your soil test results.

Because their needs align so closely, you can prepare one bed that serves both crops. Just make sure the soil is free of rocks and clods to keep beetroots from forking and onion bulbs from distorting.

How to Plant Beets and Onions Together

The best layout depends on whether you want to save space or maximize pest control. Many gardeners interplant by alternating rows — one row of beets, one row of onions — so the onion scent blankets the whole bed.

1. Prepare the soil: Loosen the top 8–10 inches and mix in 2–3 inches of compost. Remove any stones or large clods.
2. Space rows correctly: Space beet rows 3–4 inches apart for smaller roots, and individual beet seeds 2 inches apart. Leave 4–6 inches between beet rows and onion rows.
3. Plant onions as a border: For a simpler approach, plant a row of onions along the border of your beet bed. The upright onion leaves won’t shade beet tops.
4. Thin beets early: Beet seeds are actually clusters of seeds. Thin seedlings to 2 inches apart once they reach 2 inches tall to give roots room to swell.
5. Water consistently: Keep the soil evenly moist until both crops are established. Onions need steady water to form bulbs; beets need it to avoid tough, woody roots.

Grow Organic also recommends pairing beets with other alliums like garlic and leeks if you have room. The more alliums in the bed, the stronger the pest‑deterrent effect.

What Gardeners Say About Pest Control

The pest‑repelling benefit of onions is the main reason gardeners turn to this pairing. Aphids, flea beetles, and cutworms are common beet pests, and their sense of smell is disrupted by the strong sulfur compounds onions release. Per the onions repel beet pests article from Gardenary, the onion scent masks beet leaves’ natural aroma, confusing the insects and reducing damage.

Of course, companion planting won’t eliminate pests entirely. It’s a tool that lowers pest pressure, not a silver bullet. Maintaining healthy soil, rotating crops, and using row covers in early spring all add to the defense.

One thing to avoid: don’t plant beets near pole beans or field mustard. The Old Farmer’s Almanac marks these as poor companions that can stunt beet growth. Keep them in a separate bed or at the far end of the garden.

The Bottom Line

Beets and onions are a practical, low‑fuss companion pairing. Onions may help repel common beet pests, and their shallow roots leave plenty of room for beetroots to develop. Both crops share the same sunlight and soil preferences, so they thrive under identical care.

If you’re planning a garden layout, running a quick soil pH test from your local extension office can help you confirm that the bed is in the right 6.0–7.0 range before you plant — it’s one concrete step that sets up both crops for success.