Yes, tomato plants are toxic to cats, but the risk depends on which part of the plant they eat
The leaves, stems, and unripe green tomatoes of tomato plants contain solanine, a compound that is toxic to cats. Ripe red tomatoes are much safer—the solanine concentration drops as the fruit ripens—but the plant itself remains a hazard. If your cat has chewed on tomato plant leaves or stems, or eaten unripe tomatoes, watch for signs of poisoning over the next few hours.
The risk is real but usually not severe unless your cat ate a large amount. Most cats who nibble a leaf or two recover without treatment. However, cats with existing health problems, very young kittens, or senior cats may have a harder time processing the toxin and need veterinary attention sooner.
Key Takeaways
- Tomato plant leaves, stems, and green tomatoes contain solanine, which causes gastrointestinal upset and neurological symptoms in cats.
- Ripe red tomatoes are safer than unripe ones, but the leaves and stems remain toxic at any stage of the plant's growth.
- Symptoms of tomato plant poisoning in cats include vomiting, diarrhea, drooling, weakness, and tremors, usually appearing within a few hours of eating the plant.
- Move the plant out of reach, call your veterinarian if your cat shows symptoms, and bring a photo or sample of what your cat ate to help your vet assess the risk.
- Indoor cats are safer from tomato plants than outdoor cats, but even indoor plants should be placed where climbing or jumping cats cannot reach them.
Which parts of the tomato plant are most dangerous
The leaves and stems are the most toxic parts of a tomato plant. They contain the highest concentration of solanine and are the parts cats are most likely to chew on if they have access to the plant. A cat does not need to eat much leaf material to ingest a harmful dose, especially if the cat is small or young.
Unripe green tomatoes are also toxic because they still contain significant solanine. As a tomato ripens and turns red, the solanine breaks down. Fully ripe red tomatoes have very little solanine left and are generally safe for cats in small amounts, though they are not a food cats need or should eat regularly.
The roots and soil around the plant are not toxic, so a cat digging in the pot is less of a concern than one chewing the foliage. However, the act of digging can damage the plant and create a mess, so it is still worth preventing.
Symptoms of tomato plant poisoning in cats
Symptoms usually appear within 2 to 12 hours of your cat eating the toxic part of the plant. The most common signs are vomiting and diarrhea. Your cat may also drool more than usual, seem lethargic, or refuse to eat.
In more severe cases, cats may show neurological symptoms: tremors, muscle weakness, or loss of coordination. Some cats become unusually restless or anxious. These signs suggest the solanine has affected the nervous system and warrant a call to your veterinarian right away.
Mild cases—a cat who ate one or two leaves and shows only slight stomach upset—often resolve on their own within 24 hours. However, if your cat is very young, very old, or has kidney or liver disease, even a small amount of solanine can cause more serious problems. When in doubt, contact your veterinarian.
What to do if your cat eats part of a tomato plant
First, remove the plant from your cat's reach when ready. If the plant is in a pot, move it to a room your cat cannot enter, or place it on a high shelf or hanging planter where your cat cannot jump or climb to it.
Next, try to figure out what your cat ate. Did your cat chew leaves, eat a green tomato, or just nibble the stem? How much did it eat—a small bite or a mouthful? Take a photo of the plant and the damage, or save a small piece of what your cat ate if you can do so safely. This information helps your veterinarian decide whether your cat needs to be seen.
Call your veterinarian if your cat shows any of the symptoms listed above, or if you are unsure how much plant material was eaten. Your vet may ask you to monitor your cat at home for a few hours, or they may want to see your cat in person. Do not wait to see if symptoms develop on their own if your cat ate a large amount or if your cat has existing health problems.
How to keep tomato plants away from cats
The simplest solution is to not grow tomato plants indoors if you have a cat that likes to chew on plants. If you do grow them indoors, place the plant in a room your cat does not have access to—a closed bedroom, office, or greenhouse works well. Make sure the door stays closed and your cat cannot slip in when you open it.
If you grow tomatoes outdoors and your cat spends time in the garden, fence off the tomato patch or use a low garden cage around each plant. Cats are less likely to chew plants they cannot easily reach. You can also try placing the pots on a table or shelf rather than on the ground.
Some people use deterrent sprays on plants to discourage cats from chewing. Products with bitter tastes or strong scents (like capsaicin or citrus) may work, but they need to be reapplied after rain and are not foolproof. The most reliable method is physical separation—keeping the plant where your cat straightforward cannot get to it.
The difference between tomato plant toxicity and other garden plants
Tomato plants are toxic but not among the most dangerous plants for cats. Lilies, sago palms, and oleander are far more toxic and can cause severe kidney damage or death even in small amounts. Tomato plant poisoning is usually mild to moderate and rarely fatal, especially if your cat ate only a small amount.
Other common garden plants like tomatoes—such as potatoes and eggplants—also contain solanine because they are in the same plant family (Solanaceae). The toxicity level is similar. Ripe potatoes are safer than green ones, just as ripe tomatoes are safer than green ones, but the leaves and stems of all these plants should be kept away from cats.
If you have multiple plants in your home or garden, it is worth learning which ones are toxic to cats. Your veterinarian or the ASPCA Animal Poison Control Center can tell you whether a specific plant is safe. A quick phone call can save you worry later.
When to call the veterinarian versus monitoring at home
Call your veterinarian when ready if your cat ate a large amount of tomato plant material, shows any neurological symptoms (tremors, weakness, loss of coordination), or has vomited more than once. Also call right away if your cat is very young, very old, or has kidney or liver disease—these cats are at higher risk of serious poisoning even from small amounts.
If your cat ate a small amount (one or two leaves) and shows no symptoms, you can monitor at home. Watch for vomiting, diarrhea, drooling, or lethargy over the next 12 to 24 hours. If any of these appear, call your veterinarian. If your cat seems completely normal after 24 hours, the risk has passed.
Your veterinarian may recommend bringing your cat in for an exam and bloodwork if there is any doubt about how much was eaten or how your cat is responding. This is especially true if your cat has existing health problems. It is always better to be cautious with toxin exposure than to assume your cat will be fine.
Frequently Asked Questions
Can cats eat ripe red tomatoes?
Ripe red tomatoes are much safer than unripe ones because the solanine has mostly broken down. Small amounts of ripe tomato are unlikely to poison a cat. However, tomatoes are not a food cats need, and they offer no nutritional benefit. It is best to keep them away from your cat to avoid any risk.
What if my cat ate a tomato plant leaf three days ago and seems fine?
If your cat shows no symptoms three days after eating a leaf, poisoning is very unlikely. Solanine poisoning symptoms appear within hours, not days. Your cat has almost certainly recovered or was never poisoned in the first place. Continue to monitor for any changes, but the danger has passed.
Is tomato plant poisoning fatal in cats?
Tomato plant poisoning is rarely fatal in cats. Most cases cause mild to moderate stomach upset that resolves within 24 hours. Death is possible only if a cat ate a very large amount of plant material or if the cat has severe underlying health problems. Prompt veterinary care makes fatal outcomes even less likely.
Can I use pesticides on my tomato plant if I have a cat?
Pesticides add another layer of toxicity on top of the solanine already in the plant. If you use any pesticide, insecticide, or fungicide on a tomato plant, keep the plant completely away from your cat until the product has dried and any residue has been washed off. Better yet, grow tomatoes in a space your cat cannot access at all.
Do all cats get sick from tomato plants, or only some?
Not all cats will get sick from eating a small amount of tomato plant. Some cats have stronger stomachs or may not eat enough to cause symptoms. However, you cannot predict which cats will have a reaction, so it is safest to assume all cats are at risk and keep the plant out of reach.