Can tortoises eat leek?
No, leek should not be fed to a tortoise. Leek belongs to the allium family, alongside onion, garlic and chives, and alliums contain compounds that can damage a tortoise's red blood cells. It is not a food to offer even occasionally, and it has no place in a properly balanced tortoise diet.
Picked for your pet
Tortoise Feeding Kit
Komodo tortoise salad mix, hay cakes, a flower treat bar and calcium supplement for a balanced tortoise diet.
£20.49
Pettex Reptile Tortoise
Calcium-added tortoise substrate, 10 litres, for arid-habitat tortoises and lizards
£9.99
Komodo Tortoise Eco Terrain
Soil and sand substrate for arid tortoises, deep enough to burrow in, 10 litres
£9.99
Komodo Tortoise Leaf Mix
A 100G dried botanical leaf mix as a complementary treat for tortoises and other reptiles
£5.29
Why alliums are a genuine problem for tortoises
The compounds found in leek and other alliums interfere with red blood cells in a way that can lead to a form of anaemia if enough is eaten, and tortoises, like several other herbivorous species, are considered sensitive to this effect.
A tortoise's digestive system is built around a specific range of leafy greens, weeds and some vegetables, and alliums sit well outside that natural diet in both their chemical makeup and their nutritional profile — there is no upside to including them, even in a small amount.
What a healthy tortoise diet actually looks like
Most pet tortoise species do best on a diet built around a wide variety of leafy weeds and greens — dandelion, plantain and similar plants feature heavily in recommended diets — rather than a narrow rotation of shop-bought vegetables.
Where vegetables are included, they should be chosen deliberately for their suitability to your specific tortoise species, since needs vary considerably between species, and high-oxalate or high-starch vegetables are generally kept to a minimum alongside excluding alliums altogether.
If your tortoise has already eaten some
A single small amount eaten accidentally is unlikely to cause a dramatic problem in an otherwise healthy adult tortoise, but it is still worth keeping an eye on them over the following days for any change in appetite or behaviour.
If your tortoise seems unusually lethargic, stops eating, or you are at all concerned after a larger amount was eaten, contact a vet experienced with reptiles rather than waiting to see whether symptoms develop.
Keeping alliums out of reach
If you grow your own vegetables or forage weeds for your tortoise from a garden, check the bed for any leek, onion or garlic before letting your tortoise graze that area, since a tortoise foraging freely will not distinguish a safe weed from a dangerous one growing next to it.
The same caution applies to kitchen scraps — a stray leek trimming or onion peel dropped near an enclosure is easy to overlook but just as much a risk as deliberately offering a piece, so it is worth being as careful about accidental exposure as about what you actively choose to feed.
Anyone else who helps feed your tortoise — family members, a pet sitter, children keen to help — is worth briefing on the same point, since alliums are common enough in an average kitchen that a well-meaning offering is a genuine, if avoidable, risk. A simple written list of what your tortoise can and cannot eat, kept near the enclosure, is a small step that makes this much easier for anyone standing in for you.
More for your pet
Things we stock that owners commonly reach for here. Nothing on this page depends on you buying one.
Komodo Tortoise Fruit Mix
A fruit-based treat mix for tortoises, made from dandelion, aronia berries, strawberry and redcurrants
£5.29
Komodo Tortoise Food Salad Mix
A complete holistic tortoise diet flavoured to taste like fresh salad
£7.29
Komodo Tortoise Food Cucumber
A complete holistic tortoise diet in cucumber flavour, high in fibre
£7.29
Common questions
- Can tortoises eat any alliums safely?
- No, the whole allium family — onion, garlic, leek, chives and similar plants — should be avoided entirely. All of them contain compounds that can affect a tortoise's red blood cells, and there is no safe amount worth risking.
- What greens are actually good for tortoises?
- Most tortoise species do well on a variety of leafy weeds such as dandelion and plantain, alongside species-appropriate vegetables in moderation. What suits your tortoise specifically depends on the species, so it is worth checking what applies to yours.
- My tortoise ate a small piece of leek by accident — what should I do?
- A single small accidental amount is unlikely to cause a serious problem in an otherwise healthy adult tortoise, but watch them over the next few days for any change in appetite or behaviour, and contact a vet if you are concerned.
- Why are onions and leeks dangerous for tortoises but not for some other animals?
- Different species vary in how sensitive they are to allium compounds, and tortoises are among the species considered susceptible to the red blood cell damage they can cause. It is safest to treat all alliums as unsuitable rather than assuming a small amount is fine.
Related
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Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.