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Yes, you can plant cilantro with onions, and it’s actually a pairing that works well in the garden when you set things up right.
Both are cool-season crops that enjoy similar weather, so they tend to thrive side by side during spring and fall.
If you’ve been wondering whether you can plant cilantro with onions, the short answer is a confident yes.
In this post, we’ll look at why you can plant cilantro with onions, how to space them, and what to watch out for.
Let’s dig in.
Why You Can Plant Cilantro With Onions
You can plant cilantro with onions because they share compatible growing needs and don’t compete aggressively for resources.
Here’s why this combo works so well:
1. They Love the Same Weather
Cilantro and onions both prefer cool temperatures between 50°F and 70°F.
When you plant cilantro with onions in early spring or fall, both crops settle in comfortably.
Onions are hardy and can handle a light frost, while cilantro grows fastest before the heat arrives.
This shared love of mild weather means you can plant cilantro with onions at the same time without one suffering.
2. They Occupy Different Space
Onions grow underground as bulbs, while cilantro sends up leafy stems above the soil.
That means when you plant cilantro with onions, they’re not fighting for the same room.
The onion roots stay shallow and compact, and cilantro’s roots spread gently without disturbing the bulbs.
You can plant cilantro with onions in rows or clusters, and both will find their own space.
3. Cilantro Attracts Beneficial Insects
When you plant cilantro with onions, the cilantro flowers draw in hoverflies and parasitic wasps.
These good bugs help control aphids and other pests that might bother your onions.
So planting cilantro with onions isn’t just about saving space, it’s about building a healthier garden.
4. Onions Help Deter Pests
Onions release a natural sulfur scent that many garden pests dislike.
When you plant cilantro with onions, that aroma can help mask the cilantro from aphids and mites.
It’s a simple companion planting trick, and it’s one reason so many gardeners plant cilantro with onions.
How to Plant Cilantro With Onions
If you want to plant cilantro with onions successfully, a little planning goes a long way.
Here’s how to get it right:
1. Prepare Loose, Well-Drained Soil
Before you plant cilantro with onions, work the soil until it’s loose and crumbly.
Onions need good drainage to form nice bulbs, and cilantro hates soggy roots.
Mix in some compost to give both crops a gentle nutrient boost.
2. Give Them Proper Spacing
When you plant cilantro with onions, leave about 4 to 6 inches between onion sets.
Sow cilantro seeds thinly between the rows, about a quarter inch deep.
This spacing lets you plant cilantro with onions without crowding either one.
3. Water Consistently
Both crops like even moisture, so keep the bed damp but never waterlogged.
When you plant cilantro with onions, a drip line or gentle hose works best.
Consistent watering keeps cilantro from bolting too fast and helps onions plump up.
4. Feed Lightly
Cilantro doesn’t need much fertilizer, and too much nitrogen makes onions grow leaves instead of bulbs.
If you plant cilantro with onions in rich soil, you may not need to feed at all.
A light side-dressing of compost mid-season is usually plenty.
Things to Watch Out For
Planting cilantro with onions is easy, but a few issues can pop up if you’re not careful.
Keep an eye on these:
1. Cilantro Bolts in Heat
Cilantro shoots up flower stalks once temperatures climb past 75°F.
When you plant cilantro with onions, remember that onions can take a bit more warmth than cilantro.
Sow cilantro in successions so you always have fresh leaves while onions keep growing.
2. Onions Can Bully Young Seedlings
Mature onions have strong roots that can crowd tiny cilantro sprouts.
If you plant cilantro with onions, start the cilantro first or sow it between established rows.
That way the cilantro gets a fair chance to establish itself.
3. Watch for Onion Maggots
Onion maggots love the smell of onions and can show up in the bed.
When you plant cilantro with onions, rotate your crops each year to break the pest cycle.
Healthy cilantro nearby won’t stop maggots alone, so keep the soil clean and well-drained.
4. Don’t Overwater
Too much water is the fastest way to rot onion bulbs.
When you plant cilantro with onions, let the top inch of soil dry slightly between waterings.
Cilantro is forgiving, but onions are not, so err on the drier side.
So, Can You Plant Cilantro With Onions?
You can plant cilantro with onions, and the pairing rewards you with two harvests from one bed.
They share the same cool-season rhythm, occupy different layers of the garden, and even help each other fend off pests.
As long as you give them proper spacing, steady water, and a little patience, you can plant cilantro with onions without any trouble.
Whether you’re a new gardener or a seasoned one, planting cilantro with onions is a smart, simple way to make the most of your space.