Are all mushrooms toxic to tortoises?

Not all, but there is no reliable way to be sure which ones are safe without expert identification, and the nutritional benefit is minimal even for a genuinely harmless mushroom. Because there is nothing to gain and a real risk if you get it wrong, the simplest rule is to avoid mushrooms altogether rather than trying to tell them apart.

My tortoise ate a mushroom in the garden — what should I do?

Watch for any change in behaviour, appetite or droppings over the following day or two, and contact a vet experienced with reptiles if you notice anything unusual or if you can identify the mushroom as a known toxic species. Tortoises can hide illness well, so do not wait for obvious symptoms before asking for advice if you are worried.

Can tortoises eat mushrooms from the supermarket?

There is no real reason to. Shop-bought mushrooms are safer than wild ones in the sense that they are not toxic, but they still offer very little of the fibre and calcium a tortoise's diet is built around, so they are better left out in favour of proper leafy greens and a calcium supplement.

What vegetables should tortoises avoid completely?

Alongside mushrooms, most tortoise species do best avoiding starchy vegetables like potato, and anything from the onion family, which can cause digestive upset. A vet or specialist tortoise reference for your particular species is the best source for a full list, since needs vary noticeably between tortoise species.

Can tortoises eat mushrooms?

No, mushrooms are best avoided for tortoises. They offer very little of what a tortoise actually needs from its diet — fibre and calcium in particular — and because it is hard to be certain a mushroom is genuinely safe, especially one growing wild, the simplest and safest approach is to leave them off the menu altogether rather than risk it for no real benefit.

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

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Komodo Tortoise Leaf Mix

A 100G dried botanical leaf mix as a complementary treat for tortoises and other reptiles

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Why mushrooms are not worth the risk

A tortoise's natural diet is built around leafy weeds, flowers and grasses, which are high in fibre and calcium and low in protein and sugar. Cultivated mushrooms sit almost the opposite way round — mostly water, some protein, very little fibre or calcium — so even a mushroom that is not toxic is doing nothing useful for a tortoise's diet and is displacing food that would.

The bigger concern is telling a safe mushroom from an unsafe one. Wild fungi vary enormously in toxicity, some look similar to species that are genuinely dangerous, and a tortoise foraging in a garden will not distinguish between them. Even shop-bought mushrooms are grown for people, not reptiles, and there is no established safe amount for a tortoise because there is no real reason to be feeding them in the first place.

What can go wrong

A tortoise that eats a mushroom, wild or cultivated, is most likely to show digestive upset — a change in droppings, reduced appetite, or general lethargy — rather than anything more dramatic, if the mushroom happens to be a genuinely toxic species and enough was eaten. The bigger practical risk is a tortoise let loose in a garden encountering something identified with certainty only after the fact.

If your tortoise has eaten a mushroom and is showing any of those signs, or if you are not able to identify what was eaten, that is worth a call to a vet experienced with reptiles rather than waiting to see how it settles. Tortoises can mask illness well, so a change that looks minor is still worth reporting.

What to check for in the garden

If your tortoise has access to a garden or outdoor enclosure, checking it for wild mushrooms after wet weather is a simple habit worth building, in the same way you would check for other unsuitable plants. Fungi tend to appear quickly after rain and disappear just as fast, so a garden that looked clear a few days ago is worth a second look.

Removing anything you are not sure about is the safer approach rather than trying to identify it, since misidentifying a genuinely toxic species is the actual risk here, not the mushroom family as a whole.

What to feed instead

A varied mix of safe leafy weeds and greens — the kind already recommended for tortoises — does the nutritional job mushrooms cannot, providing the fibre and calcium a shell and digestive system actually need. A calcium supplement dusted over food is also standard practice for most pet tortoises rather than something to rely on diet alone for.

If you want to introduce more variety into a tortoise's diet, our reptile food range includes prepared tortoise foods formulated around what the species actually needs, which is a safer way to add variety than experimenting with garden finds.

More for your pet

Things we stock that owners commonly reach for here. Nothing on this page depends on you buying one.

Komodo Tortoise Hay Cakes

A dried grass and dandelion hay cake for tortoises

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Komodo Tortoise Fruit Mix

A fruit-based treat mix for tortoises, made from dandelion, aronia berries, strawberry and redcurrants

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Komodo Tortoise Food Salad Mix

A complete holistic tortoise diet flavoured to taste like fresh salad

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Komodo Tortoise Food Cucumber

A complete holistic tortoise diet in cucumber flavour, high in fibre

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Common questions

Are all mushrooms toxic to tortoises?: Not all, but there is no reliable way to be sure which ones are safe without expert identification, and the nutritional benefit is minimal even for a genuinely harmless mushroom. Because there is nothing to gain and a real risk if you get it wrong, the simplest rule is to avoid mushrooms altogether rather than trying to tell them apart.
My tortoise ate a mushroom in the garden — what should I do?: Watch for any change in behaviour, appetite or droppings over the following day or two, and contact a vet experienced with reptiles if you notice anything unusual or if you can identify the mushroom as a known toxic species. Tortoises can hide illness well, so do not wait for obvious symptoms before asking for advice if you are worried.
Can tortoises eat mushrooms from the supermarket?: There is no real reason to. Shop-bought mushrooms are safer than wild ones in the sense that they are not toxic, but they still offer very little of the fibre and calcium a tortoise's diet is built around, so they are better left out in favour of proper leafy greens and a calcium supplement.
What vegetables should tortoises avoid completely?: Alongside mushrooms, most tortoise species do best avoiding starchy vegetables like potato, and anything from the onion family, which can cause digestive upset. A vet or specialist tortoise reference for your particular species is the best source for a full list, since needs vary noticeably between tortoise species.

Sources

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.