Is a Monstera Toxic to Humans, Pets, and Other Animals?

A complete guide to monstera toxicity covering humans, dogs, cats, birds, fish, and rabbits, with emergency steps, symptoms, and how to keep everyone safe

The monstera is one of the most popular houseplants in the world, and for very good reason.

Its dramatic, deeply fenestrated leaves, easy-going nature, and striking tropical appearance make it a near-perfect indoor plant for millions of homes across the US and UK.

But there is one aspect of monstera ownership that every parent of young children or pets needs to understand clearly before placing one in their home.

The monstera deliciosa is toxic.

Every part of the plant, the leaves, stems, and unripe fruit, contains insoluble calcium oxalate crystals that cause a distinctive and very unpleasant set of symptoms in humans, dogs, cats, birds, and rabbits if ingested or if the sap comes into contact with skin.

This guide covers everything you need to know about monstera toxicity: what the crystals are and what they do, the specific symptoms to watch for in humans and each type of pet, the emergency steps to take if ingestion occurs, and the most effective ways to keep children and animals safe in a home where a monstera is growing.

Monstera Toxicity at a Glance

What Makes the Monstera Toxic: Calcium Oxalate Crystals

The toxicity of the monstera is caused by insoluble calcium oxalate crystals, specifically microscopic needle-like structures called raphides that are present throughout the plant’s leaves, stems, and unripe fruit.

These raphides exist as a natural defence mechanism.

When a person or animal bites into a monstera leaf or stem, the pressure of the bite releases thousands of tiny calcium oxalate needles from specialised cells called idioblasts.

These needles penetrate the soft tissue of the mouth, tongue, throat, and gastrointestinal tract almost instantly, causing an intense burning, stinging sensation that is the plant’s way of discouraging the animal from consuming it further.

The action is rapid and effective: most animals stop eating immediately when the burning begins.

In humans, the consequences depend heavily on how much plant material was consumed before the burning sensation prompted the person to stop.

In small children and cats, whose body size means even a small quantity of plant material causes significant proportional irritation, the effects can be more pronounced and more rapidly concerning.

Understanding exactly what the crystals do helps you respond appropriately when exposure occurs.

The burning and swelling are caused by the mechanical action of the crystal needles in the tissue, combined with a secondary chemical irritant in the sap.

This is why symptoms are almost immediate on contact with the plant, and why water, milk, or other soothing substances are the appropriate first response rather than attempting to induce vomiting.

Monstera Toxicity Rating: Where It Sits on the Scale

The monstera deliciosa currently holds a toxicity rating of 2a on the standard plant toxicity classification scale.

Understanding what this means in context helps you assess the level of concern appropriately.

Rating 1: Plants that cause contact reactions including itching, rashes, redness, or blistering on skin contact.

Rating 2a (Monstera deliciosa): Plants containing fast-onset insoluble oxalates in needle form.

Ingestion causes immediate burning, swelling, and irritation of the mouth, throat, and gastrointestinal tract.

Breathing difficulty can occur in severe cases owing to throat swelling.

Rating 2b: Plants with late-onset soluble oxalates that do not cause immediate symptoms but accumulate in the kidneys over time, putting the patient at risk of kidney damage.

Rating 3: Plants that cause diarrhoea, nausea, and vomiting on ingestion, though not typically life-threatening.

Rating 4: The highest risk category, where ingestion of even a small quantity can damage the heart, liver, brain, or other vital organs.

Call Poison Control immediately if a plant in this category has been consumed.

A rating of 2a means the monstera is painful and unpleasant when ingested but is not in the high-danger category.

Serious consequences are rare in otherwise healthy humans and animals, particularly because the rapid onset of burning usually stops ingestion quickly.

However, this does not mean monstera ingestion should be treated casually.

In young children, small pets, and animals that do not stop eating when the burning begins, the quantity consumed can be enough to cause serious symptoms that require emergency treatment.

What Happens If You Touch a Monstera?

Before covering ingestion, it is worth addressing skin contact, since many monstera owners handle the plant regularly when pruning, cleaning, or repotting.

The sap of the monstera is a skin irritant for many people.

Contact with fresh sap, particularly during pruning or propagation, can cause redness, itching, and a rash on the skin.

In sensitive individuals, the reaction can be more pronounced, resembling a mild chemical burn or contact dermatitis.

The discomfort generally subsides after washing the affected area thoroughly with soap and water, but it is better avoided by wearing disposable gloves whenever you handle the plant directly.

Sap that gets into the eyes causes significant irritation and should be flushed immediately with clean running water for fifteen minutes.

If eye irritation persists after flushing, seek medical attention.

When cleaning monstera leaves, wearing gloves and using a damp cloth rather than bare hands avoids unnecessary sap contact, particularly on plants that have been pruned recently and may have fresh sap on the cut surfaces.

Is a Monstera Toxic to Humans?

Yes. Every part of the monstera plant except ripe fruit contains insoluble calcium oxalate crystals that are toxic to humans if ingested.

The Children’s Health Queensland Hospital and Health Service lists the monstera deliciosa as a plant requiring medical attention if consumed, particularly by children, owing to the risk of throat swelling and breathing difficulty in more serious cases.

Symptoms in Humans

Symptoms begin almost immediately after ingestion, typically within seconds to minutes of the plant material entering the mouth.

Intense burning pain in the mouth, tongue, and throat, beginning at the point of contact and spreading as the raphides penetrate the tissue.

Swelling of the lips, tongue, mouth, and throat, which in more serious cases can develop to the point of interfering with swallowing and breathing.

Drooling as the mouth produces excess saliva in response to the irritation.

Difficulty speaking and swallowing owing to the combination of pain and swelling.

In some cases, nausea and abdominal pain if enough plant material was swallowed before the burning sensation stopped ingestion.

Vomiting, which may occur spontaneously but should not be induced.

Skin irritation, hives, or rash in individuals who have touched the plant material with bare hands or whose skin has been exposed to the sap.

What to Do If a Human Ingests Monstera

Do not induce vomiting.

Forcing vomiting moves the calcium oxalate crystals back through the throat and mouth, which are already irritated, causing additional burning and increasing the risk of choking.

If the person vomits spontaneously, that is acceptable, but never induce it.

Remove any plant material remaining in the mouth or on the hands and dispose of it safely.

Rinse the mouth gently with clean water and encourage the person to sip small amounts of cool water or milk to soothe the burning sensation.

Do not make them drink large quantities if swallowing is painful, as this can cause choking.

Wash any skin that has been in contact with the plant or its sap with soap and water.

Call Poison Control immediately, even if symptoms seem mild.

In the US, the number is 1-800-222-1222 and is available 24 hours a day, seven days a week.

In the UK, call the NHS 111 service or 111 online.

The Poison Control team will assess the symptoms and advise whether emergency medical attention is required.

If breathing difficulty, significant throat swelling, or loss of consciousness occurs, call 911 (US) or 999 (UK) immediately.

If you attend the emergency department, bring a piece of the monstera plant or a clear photograph of it so that the medical team can confirm the source of toxicity and provide the most appropriate treatment.

Do not wait for symptoms to worsen before calling.

Throat swelling can develop relatively quickly, and early intervention is significantly easier and safer than managing an escalated situation.

Is a Monstera Toxic to Children?

Yes, and children require particular caution because they are more likely to put plant material in their mouths and are less able to communicate what has happened.

Young children’s smaller body mass means that even a small quantity of monstera leaf can cause proportionally more significant symptoms than the same quantity would in an adult.

Recognising Ingestion in a Child Who Cannot Communicate Clearly

Look for these signs if you suspect a young child has eaten monstera:

Unexplained crying or distress, particularly if they are touching or pointing at their mouth. Drooling more than usual. Refusing food or drink that they would normally accept.

Redness, swelling, or visible irritation around the lips and mouth.

Visible damage on the monstera plant, including torn or bitten leaves, particularly at a height accessible to the child. Plant material on the child’s hands, face, or clothing.

If you cannot find missing plant material and the child is showing any of the above signs, treat this as potential ingestion and call Poison Control immediately.

Emergency Steps for a Child

Follow the same steps as for adults: do not induce vomiting, remove any plant material from the mouth, rinse gently with cool water, and call Poison Control right away.

If the child is showing any sign of throat swelling or difficulty breathing, call emergency services immediately rather than waiting.

Is a Monstera Toxic to Dogs?

Yes. The ASPCA lists the monstera as toxic to dogs, and the mechanism is the same calcium oxalate raphides that affect humans.

Dogs are at risk both from ingesting monstera plant parts and from sap contact on the skin, which can cause irritation even without ingestion.

Most dogs will stop eating the plant quickly when the burning begins, which limits the quantity consumed in most cases.

However, puppies, young dogs with high curiosity, and dogs that chew persistently may consume enough to cause significant symptoms.

Signs of Monstera Toxicity in Dogs

Symptoms typically appear within minutes of ingestion and may include: Excessive drooling as the mouth responds to irritation.

Pawing at the mouth or face in an attempt to relieve the burning sensation.

Retching or vomiting.

Diarrhoea in cases where enough plant material reached the gastrointestinal tract.

Swelling of the mouth, lips, tongue, or throat.

Difficulty swallowing or choking.

Reluctance to eat or drink after the incident.

In severe cases, difficulty breathing owing to throat swelling.

How Serious Is Monstera Toxicity in Dogs?

The degree of toxicity depends on several factors.

The age of the dog matters: puppies and very old dogs are more vulnerable than healthy adult dogs, as their immune systems and overall resilience are lower.

The size of the dog matters: a large dog consuming a small piece of leaf will experience less impact proportionally than a small dog consuming the same quantity.

The general health of the dog matters: a dog already compromised by illness is more vulnerable to a significant toxic reaction.

Fatality from monstera ingestion is rare in dogs, but this does not mean the situation should be managed passively.

Throat swelling that progresses to breathing difficulty can become life-threatening without prompt veterinary intervention.

What to Do If Your Dog Eats Monstera

Encourage the dog to drink water to help soothe the burning in the mouth and move any swallowed crystals through the digestive system.

Do not attempt to induce vomiting unless specifically directed to do so by a veterinarian or the ASPCA animal poison control team.

Call the ASPCA Animal Poison Control Center at 1-888-426-4435.

This line is available 24 hours a day, seven days a week, and the team will advise on the specific steps to take based on your dog’s symptoms and size.

Note that a consultation fee applies for this service.

Take the dog to a vet if the ASPCA team advises it, or if symptoms worsen, particularly if swelling or breathing difficulty develops.

After the incident, move the monstera to a location your dog cannot access.

A dog that has experienced the painful effects of eating monstera will often avoid the plant in future, but this is not guaranteed, particularly in persistent chewers.

Is a Monstera Toxic to Cats?

Yes, and cats may be at greater risk than dogs in some respects because of their smaller body size and the speed with which the calcium oxalate crystals cause significant irritation.

Symptoms in cats can develop within thirty seconds of ingesting monstera plant parts, which is why a cat that has eaten even a small amount may be showing obvious distress very quickly.

Signs of Monstera Toxicity in Cats

Excessive drooling. Pawing at the mouth, face, or throat. Vomiting. Facial swelling, particularly around the mouth and lips.

Burning and inflammation of the tongue and oral tissue. Difficulty eating, drinking, or swallowing after the incident. In more serious cases, difficulty breathing.

Loss of interest in food for a period after the incident owing to persistent mouth discomfort.

What to Do If Your Cat Eats Monstera

Rinse the cat’s mouth gently with clean water if you can do so safely without distressing the cat further.

Do not force the cat to swallow the water, as this can move the calcium oxalate crystals further into the gastrointestinal tract and trigger additional irritation.

Offer a small amount of milk if the cat will accept it voluntarily.

Milk can help to soothe the burning by providing a coating effect on the irritated tissue.

Do not force it if the cat is unwilling or unable to drink comfortably.

Call the ASPCA Animal Poison Control Center at 1-888-426-4435 or contact your vet for guidance on the next steps.

If the cat is showing signs of facial swelling, breathing difficulty, or extreme distress, seek emergency veterinary care immediately rather than waiting.

Protecting Your Cat From the Monstera

Unlike dogs, cats may continue to return to the monstera and nibble on it even after experiencing adverse symptoms, because cats are naturally curious and persistent explorers of their environment.

Keeping the plant physically out of reach is the most reliable protection.

Hanging the monstera from a ceiling hook or bracket, placing it on a high shelf the cat cannot access, or moving it to a room the cat does not enter are the most effective measures.

Using a natural citrus-based repellent spray on the pot and surrounding surfaces can deter the cat from approaching the plant.

Cats generally dislike citrus scents and will often avoid areas that smell strongly of lemon or orange.

Providing the cat with cat grass or catnip as an alternative plant to nibble on reduces the appeal of other household plants.

You may also be interested in our guide on whether a monstera can live outside, which covers positioning the plant outdoors as an option for households with persistent plant-nibbling cats.

Is a Monstera Toxic to Birds?

Yes. The ASPCA confirms that the calcium oxalate crystals in monstera plant parts are toxic to birds, producing the same irritation and swelling of the gastrointestinal tract that affects mammals.

Birds are naturally drawn to plants both as perching points and as potential food sources, and a pet bird with access to a monstera will often investigate it out of curiosity.

Signs of Monstera Toxicity in Birds

Irritation and swelling of the mouth and throat.

Difficulty eating.

Lethargy or unusual quietness after exposure.

Laboured or abnormal breathing if swelling is significant.

Regurgitation in some cases.

What to Do If Your Bird Eats Monstera

Offer the bird a small clay supplement if available, which can help to bind and neutralise the oxalate crystals.

Call the ASPCA Animal Poison Control Center or your avian vet immediately.

Treating toxicity in birds is more complicated than in mammals, and prompt professional guidance is essential.

Birds have a rapid metabolism and small body mass, which means the effects of a toxic plant can escalate more quickly in a bird than in a similarly sized mammal.

Moving the monstera out of the home entirely is strongly recommended in households with pet birds, rather than attempting to position it out of reach.

Birds can be unpredictable in their ability to access plants through flight, and the risk of repeated exposure in a home where a bird is free to fly is difficult to manage reliably.

Is a Monstera Toxic to Rabbits?

Yes, and rabbits present a particularly serious concern compared to other common household pets.

The raphides released when a rabbit bites into monstera plant material cause the same burning irritation as in other animals.

However, unlike dogs and cats, rabbits typically do not stop eating when the burning begins.

Their grazing instinct and inability to recognise the plant as the cause of their discomfort can lead them to consume significantly more plant material than a dog or cat would, increasing the risk of serious symptoms.

Rabbits may also continue seeking out the plant and consuming it repeatedly even after experiencing adverse effects, because they lack the associative learning that leads dogs, and to some extent cats, to avoid the plant after a painful experience.

Signs of Monstera Toxicity in Rabbits

Drooling excessively.

Vomiting or attempting to vomit.

Visible distress or unusual behaviour.

These symptoms appear within hours of ingestion and indicate that the oxalate crystals are irritating the gastrointestinal tract.

What to Do If Your Rabbit Eats Monstera

This is an emergency situation requiring immediate veterinary intervention.

Do not wait to see whether symptoms resolve on their own.

Call your vet or an emergency animal clinic immediately and explain that the rabbit has consumed monstera plant material.

With prompt and appropriate medical care, rabbits can make a full recovery from monstera ingestion.

However, the window for effective intervention is shorter and the risk of serious harm is higher than for dogs and cats, so speed of response is critical.

Keep the monstera completely out of reach of rabbits at all times, and do not rely on repellent sprays or deterrents as a primary safety measure with rabbits, as these are significantly less effective with rabbits than with cats.

Is a Monstera Toxic to Fish?

The risk to fish is low in most cases, but it depends on the species.

The monstera can be grown with its roots in an aquarium, and doing so provides benefits to the water quality by absorbing nitrates and helping to filter the water.

For non-vegetarian fish species that do not feed on plant matter, the presence of a monstera root system in the aquarium presents very little risk.

For herbivorous or omnivorous fish species that feed on aquatic plant material, there is a theoretical risk from the calcium oxalate crystals in the leaves if leaves fall into the water or the fish nibbles on plant tissue.

If your aquarium contains leaf-eating fish species, add a physical barrier between the fish and the monstera’s leaves and ensure no plant material falls into the water.

For most standard aquarium fish setups, the monstera presents no meaningful toxicity risk.

Keeping Everyone Safe: Practical Prevention Strategies

Understanding the toxicity of the monstera is the first step.

The second step is actively structuring your home environment so that children and pets cannot reach the plant.

Positioning the Plant Safely

Place the monstera on a high shelf or surface that young children cannot reach and that cats cannot access by jumping.

A ceiling-mounted hook or bracket that allows the monstera to hang at ceiling height is one of the most effective solutions, as it keeps the plant entirely out of reach of both children and most pets.

However, hanging does not provide sufficient protection in homes with birds, which can fly directly to the plant.

Read our guide on where to place your monstera for full positioning advice that considers both light requirements and safety.

Using Plant Stands and Barriers

A tall plant stand places the monstera at a height that is more difficult for children and small pets to access.

A physical barrier such as a plant cage or a room divider can prevent access to the plant without requiring it to be moved to a different location.

Placing the plant in a room that children and pets do not have unsupervised access to is one of the simplest and most reliable protective measures.

Moving the Plant Outdoors

In suitable climates, moving the monstera outdoors entirely removes the risk of indoor ingestion.

See our guide on growing monstera outside in summer and whether a monstera can live outside for guidance on the conditions the plant needs for outdoor growing.

If You Cannot Move the Plant

If repositioning the monstera is not practical, be consistent about supervising young children and pets when they are in the same space as the plant.

Teach older children clearly that the plant is not safe to touch or eat.

Check the plant regularly for signs of nibbling: missing or damaged leaves are often the first indication that a pet or child has accessed the plant.

Emergency Contact Reference

Save these numbers before you need them.

United States

Poison Control (humans): 1-800-222-1222 (24 hours, 7 days)

ASPCA Animal Poison Control Center (pets): 1-888-426-4435 (24 hours, 7 days; consultation fee applies)

Emergency services: 911

United Kingdom

NHS 111 (humans, non-emergency): 111 or 111.nhs.uk

Emergency services (humans): 999

Animal Poison Line (UK pets): 01202 509000 (24 hours; consultation fee applies)

PDSA Vet Helpline: available at pdsa.org.uk

Emergency veterinary services: contact your registered vet or nearest emergency animal clinic

Can a Monstera Recover After Being Chewed or Damaged by a Pet?

Yes. The monstera is a remarkably resilient plant and will recover well from pet or child damage in most cases.

Remove any torn, chewed, or heavily damaged leaves by cutting them cleanly at the base of the petiole with clean, sharp scissors.

This prevents the damaged tissue from becoming a site for bacterial or fungal infection and redirects the plant’s energy toward producing healthy new growth.

Provide the plant with appropriate light, correct watering, and suitable soil conditions after the damage, and the monstera will typically produce new leaves within a few weeks.

See our full guide on how to save a damaged monstera and how to revive a dying monstera if the damage is more extensive.

Related Monstera Guides

Understanding the safety of your monstera is part of the broader picture of caring for it well.

For comprehensive care guidance, see our complete monstera care guide and our beginner-focused guide on monstera care in small apartments.

If you are concerned about other aspects of your plant’s health, our guides on why monstera leaves turn yellow, why monstera leaves turn brown, and why monstera leaves turn black cover the full range of common problems and their causes.

For information on the plant itself, including its varieties and characteristics, see our guide to monstera varieties and our article on why the monstera is so popular.

Frequently Asked Questions

Is touching a monstera dangerous?

For most people, touching the leaves of a healthy monstera is not immediately harmful.

The risk comes from contact with the sap, which is released when the plant is cut, pruned, or damaged.

Fresh sap can cause skin irritation, redness, and rash in many people, and more significant reactions in those with sensitive skin.

Always wear gloves when pruning, repotting, or propagating your monstera, and wash any sap off the skin immediately with soap and water.

What part of the monstera is most toxic?

All parts of the plant except ripe monstera fruit contain calcium oxalate crystals.

The leaves and stems are the most commonly encountered toxic parts, and the sap that is released when these are damaged or cut is also an irritant.

The roots contain oxalate crystals as well, though these are less commonly accessed by children or pets.

How quickly do monstera toxicity symptoms appear?

In most cases, symptoms begin within seconds to a few minutes of the plant material entering the mouth, because the raphides penetrate the oral tissue almost immediately on contact.

This rapid onset is actually one of the plant’s protective mechanisms, as the immediate burning discourages further consumption.

Is the monstera more dangerous than other common houseplants?

The monstera sits in a moderate toxicity category at rating 2a.

It is more toxic than many common houseplants and requires caution in homes with children and pets, but it is significantly less dangerous than plants in the highest toxicity categories, where even small quantities can cause organ damage.

The key risk with the monstera is throat swelling and breathing difficulty in serious cases, particularly in young children and small pets, which is why prompt action rather than a wait-and-see approach is always the right response.

My pet has eaten monstera. Should I wait to see if symptoms develop?

No.

Call Poison Control or the ASPCA Animal Poison Control Center immediately, even if symptoms seem mild or have not yet appeared.

The specialist teams at these services will assess the situation based on your pet’s size, the quantity consumed, and the symptoms present, and will advise whether you need to seek emergency veterinary care.

Early intervention is always easier and safer than managing escalated symptoms.

Can I keep a monstera if I have pets or young children?

Yes, but you need to position it where it genuinely cannot be reached.

A ceiling-mounted plant, a room with a door that can be kept closed, or a very high shelf that children cannot climb to and pets cannot jump to are all effective solutions.

The alternative is to move the plant outdoors if your climate allows it.

What is not a safe long-term strategy is relying on the plant’s appearance to deter investigation: children and pets are curious, and a plant that looks interesting will eventually be explored.

Key Takeaways

The monstera deliciosa is toxic to humans, dogs, cats, birds, and rabbits. Every part of the plant except ripe fruit contains insoluble calcium oxalate crystals that cause immediate burning, swelling, and irritation when ingested.

Do not induce vomiting if ingestion occurs. In both humans and pets, forcing vomiting causes the crystals to re-irritate the throat and mouth and increases the risk of choking.

Call Poison Control or the ASPCA immediately, even for mild symptoms. The rapid onset of symptoms means early intervention is far safer than a wait-and-see approach.

Rabbits are at the highest risk among common pets. They do not stop eating when the burning begins and may consume enough to cause serious harm. Monstera access must be completely prevented in homes with rabbits.

Throat swelling and breathing difficulty are the most serious potential symptoms. If either develops in a human or pet, call emergency services immediately.

The plant recovers well from damage. If a child or pet has chewed your monstera, prune the damaged leaves cleanly and provide normal care. The plant will produce healthy new growth.

Prevention is always better than treatment. Position the monstera where it genuinely cannot be reached, rather than relying on deterrents alone.

Useful Resources

ASPCA Animal Poison Control: Toxic and Non-Toxic Plants

Children’s Health Queensland Hospital: Fruit Salad Plant (Monstera deliciosa)

California Poison Control System

Washington State University Extension: Poisonous Plants and Pets

US Poison Control Center: 1-800-222-1222

ASPCA Animal Poison Control Center: 1-888-426-4435