Chives vs. Green Onions: Species, Flavor, Nutrition and Swaps

Chives and green onions both give you a fresh onion note without the bulk of raw onion, and for a garnish you can swap one for the other easily, though not in a cooked dish. Chives are a perennial herb whose thin leaves almost always go on raw, at the end. Green onions, also sold as scallions or spring onions, have thicker leaves and white bases that can be cooked or eaten raw. And that rule you’ll see about needing six times as many chives? We couldn’t find a source for it.

Side by side

The nutrient figures are USDA’s for raw chives and for raw scallions with the bulb, so the scallion numbers aren’t for tops alone.

Names: what “green onion” means

Green onion, scallion and spring onion are regional names for the same thing. Oregon State University’s vegetable guide says green bunching onions go by all three, and today they’re most often A. fistulosum, though plenty of A. cepa, the regular bulb onion, is still grown for green onions.⁵ Almost any onion grown for its green tops can be called a bunching onion or scallion. A. fistulosum also goes by Welsh onion, Japanese bunching onion and spring onion.

You’ll often read that green onions are “mature scallions.” The sources above treat the names as interchangeable, not as stages of growth.

Chives are a separate species, usually treated as an herb, while other onions get treated as vegetables. Garlic chives are another plant again; see garlic chives vs. chives.

How they differ in the plant

Size and shape. Chives grow in clumps of thin, tubular leaves. PROSEA gives A. fistulosum leaves as hollow, round in cross-section and 1.0 to 2.5 cm across.² We couldn’t find a published diameter for chive leaves.

The base. Both count as bulb-forming plants (bulbous geophytes), but neither makes the big bulb of an onion. PROSEA calls the A. fistulosum bulb indistinct, passing gradually into the stem, and notes that A. cepa has a much better-developed bulb.² Welsh onions don’t usually produce a bulb, which is why they’re grown for their tops, and some A. fistulosum types swell slightly at the base.

Harvest. Chives are perennials that come back every year, and you can cut the young leaves any time during the growing season. Green onions usually get pulled and sold whole, in bunches. Chives get snipped and left to regrow.

Flavor

UW-Madison Extension describes chives as mild onion, more pungent in hotter weather.⁶ PROSEA says Welsh onion’s smell isn’t very strong and is chemically related to bulb onion’s, coming from volatile allyl sulfides.² We found no study measuring the two side by side, so neither source settles which is stronger. You’ll often read that chives are far more potent than green onions, but the extension guides that publish a swap treat them as equal by volume (see below).⁷⁸

In the kitchen, chives come across gentle and grassy-oniony. Green onion tops are similar but a little sharper, and the white base is closer to a mild onion.

Cooking

Chives go on at the end. Chive leaves usually get chopped and sprinkled on food just before serving. LSU AgCenter lists chives among the delicate herbs to add in the last minute or two, since long cooking costs flavor and aroma,⁹ and America’s Test Kitchen counts chives among the delicate herbs whose flavor compounds are more volatile.¹⁰ Their common uses are eggs, soups, salads and vegetables, and they’re one of the French fines herbes, along with parsley, tarragon and chervil.

Green onions can take heat. In East Asia the thick, blanched pseudostems are eaten cooked as a pot herb, and the green leaves go into salads or flavor soups. In Java, whole plants are steamed or briefly grilled. They go into stir-fries, fried rice, braises and pancakes, often with the greens held back for garnish.

Nutrition and warfarin

Per 100 g, USDA data show chives with more vitamin A and C than scallions, and about the same vitamin K (213 µg against 207 µg).³⁴ Nobody eats 100 g of chives, though. A tablespoon of chopped chives weighs 3 g and a tablespoon of chopped scallions 6 g, so by our math a tablespoon gives you about 6 µg of vitamin K from chives and 12 µg from scallions. That’s about 5% and 10% of the 120 µg Daily Value.¹¹

This only matters if you take the blood thinner warfarin. MedlinePlus lists scallions (green onions) among the foods that can change how warfarin works, and its advice isn’t to avoid them but to keep the amount small and steady.¹² The NIH Office of Dietary Supplements likewise says to get about the same amount of vitamin K each day.¹³ A garnish isn’t the concern. A big scallion-heavy dish on some days and not others might be. Ask your prescriber.

Can one stand in for the other?

Green onions for chives. Ratio (Attributed): all three sources agree on a straight swap by volume.⁷⁸¹⁴ Use the green tops, sliced as thin as you can. There’s more on chives substitutes.

Chives for green onions. Ratio (Method): for a raw garnish, start with the same volume and taste. If the green onions are supposed to cook in a stir-fry or braise, chives won’t hold up. Stir them in at the end, or use another allium.

There’s a widely repeated rule that you need six times as many chives to replace green onions, and a sixth as much green onion to replace chives. We found no source for it, and the extension guides’ 1:1 swap contradicts the second half.

What isn’t known

• No study compares the flavor compounds or pungency of chives and green onions directly, and we found no published analysis of chive flavor chemistry.
• We couldn’t find a published leaf diameter for chives.
• USDA’s scallion figures include the bulb, so they don’t describe green tops alone.

Related

• Chives, the full profile, and chives substitutes
• Garlic chives vs. chives and garlic chives
• How to dry chives
• Fines herbes and fines herbes substitutes