Green Onion / Scallion (green part only)
Vegetables · Alliums
Yes. The green tops are the part of a spring onion you get to keep: one tablespoon chopped, 12 g, carries 0.02 g of fructans and is rated green. The pale white bulb at the other end of the same plant is rated red, so a scallion is only as gut friendly as the place you cut it.
Last updated 4 September 2026Serving sizes for green onion / scallion (green part only)
The tested serve is one tablespoon of chopped green tops, about 12 g, rated green.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1 tablespoon chopped | 12 g | Fructans 0.02 g |
Breakdown for 1 tablespoon
Is green onion / scallion (green part only) low FODMAP?
Fructans are the only FODMAP group spring onions carry in any quantity, and the plant keeps them in the bulb rather than the leaf. A tablespoon of chopped tops holds 0.02 g, a fifth of the 0.1 g level at which fructans begin counting towards a rating, while a single white bulb of 5 g holds 0.22 g. Only that one leaf portion has been tested, so a tablespoon is the amount the guide can vouch for rather than a ceiling anybody has measured.
Green Onion / Scallion (green part only) and IBS: what to know
Colour is the instruction in the kitchen: keep the dark tube, stop where the leaf turns pale and firm, and set the rest aside. That pale transition zone is where people go wrong, because it looks like leaf and behaves like bulb, and a bunch is usually sold with the bulbs still attached. The tops also wilt first, so the safe half of the plant is the half that spoils fastest. Trimming a bunch on the day you buy it, rather than the night you cook, is what makes the split a habit instead of a decision.
Gut-friendly ways to eat green onion / scallion (green part only)
Use the tops as a finish rather than a base. Sliced thinly over eggs, rice, noodles or a baked potato they restore the fresh allium bite that goes missing during elimination, and softened in garlic-infused oil they start a stir-fry perfectly well. Chopped greens freeze loose in a bag and go straight into a hot pan, which beats watching a bunch go slimy in the crisper. Rotate them with chives so every meal does not land on the same note.
Frequently asked questions
How much spring onion green can I eat at once?
The tested amount is one tablespoon chopped, 12 g, with 0.02 g of fructans, which is a long way under the level where fructans count. Larger handfuls have not been tested, so the guide cannot put a figure on them, but the tested serve is small and the fructan load in it is very light. Most people use the tops generously without trouble.
Are cooked spring onion greens still low FODMAP?
Yes. Heat does not raise or lower fructans, so wilting the tops into an omelette, scattering them over a stir-fry or stirring them through soup leaves the rating where it is. Add them in the last minute anyway, since the flavour is brighter and the colour holds. What goes in the pan with them matters more than the cooking method.
Why does this guide list spring onion twice?
Because it is filed both as a vegetable and as a flavouring. The herbs and spices entry covers the same green tops for when you are looking up a seasoning rather than a side dish, and the white bulbs have their own pair of entries. Whichever one you land on, the green rating belongs to the dark leaf only.
Can I use spring onion greens instead of onion?
For the raw, sharp note, yes: sliced tops over a salad, a taco or a soup do the job onion was doing. For the sweet, deep base under a stew they fall short, because that flavour comes from long cooking of the bulb. Pair the greens with an infused oil for depth, and expect to use more than the recipe asks for.
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