Is String of Bananas Toxic to Pets? Senecio Radicans Risk

Last updated: May 16, 2026

The Short Answer on String of Bananas and Pets

String of bananas is toxic to both cats and dogs. The plant, Senecio radicans, is a trailing succulent in the daisy family with curved banana-shaped leaves that cascade from hanging baskets and shelf edges. It belongs to the Senecio genus, which produces pyrrolizidine alkaloids and other irritant compounds that cause acute GI upset on exposure and chronic liver concerns with repeated or large exposures. Severity for most acute exposures sits in the mild-to-moderate range, but the underlying chemistry is the same family as ragwort, the famous livestock killer, which is reason enough to treat any exposure with respect.

If your pet just chewed a string of bananas leaf or you find chewed banana-shaped leaves on the floor under the hanging basket, move the plant out of reach, photograph what was eaten, and call your veterinarian, the ASPCA Animal Poison Control Center at 888-426-4435 (consultation fee applies), or the Pet Poison Helpline at 855-764-7661 (consultation fee applies). Most acute exposures resolve well with supportive care, but a vet call gives you a clear baseline and helps rule out cumulative liver concerns.

What String of Bananas Actually Is

String of bananas, sometimes called string of fishhooks or banana vine, is Senecio radicans, a trailing succulent native to South Africa. The plant produces long thin stems lined with curved, banana-shaped fleshy green leaves about half an inch long. The leaves are filled with translucent water storage tissue that gives them a slightly transparent stripe, similar to other Senecio succulents. Small white daisy-like flowers appear seasonally on mature plants. It is a common houseplant on Etsy, Instagram, and indoor plant retailers, especially in the trailing-houseplant genre that includes string of pearls, string of dolphins, and string of hearts.

Senecio radicans is in the Asteraceae family (the daisy family) along with hundreds of other Senecio species. The genus is enormous and chemically variable, but most Senecio species share the pyrrolizidine alkaloid chemistry that has made ragwort (Senecio jacobaea) infamous in livestock medicine. The succulent Senecio species marketed as houseplants share the same family chemistry, although concentrations differ across species.

The plant’s resemblance to a row of tiny bananas, combined with its trailing habit, makes it visually irresistible for indoor display. Hanging baskets near windows are the most common placement, which puts cascading leaves at perfect cat-pawing height in many homes. The leaves break off easily when chewed, and the broken stems leak a slightly sticky sap that some pets continue licking after the initial bite.

The Pyrrolizidine Alkaloid Mechanism

Pyrrolizidine alkaloids (PAs) are a family of plant defensive compounds best known from ragwort, comfrey, and several other Senecio species. The compounds are not particularly toxic in their original form, but the liver converts them into reactive metabolites that damage liver cells and, with chronic exposure, cause progressive liver fibrosis. Acute single exposures usually produce GI signs and self-limiting illness; chronic exposures produce a pattern of cumulative liver damage that can present months later.

Senecio radicans contains lower PA concentrations than agricultural ragwort, but the chemistry is in the same family and the practical lesson is the same. A cat that nibbles a leaf occasionally is at low acute risk. A cat that has been chewing string of bananas regularly for weeks is at a different kind of risk that may not show until liver values shift on bloodwork. The acute and chronic risk profiles are different enough that vets sometimes recommend liver value monitoring after sustained exposure even when the pet currently looks fine.

Other Senecio succulents like string of pearls (Senecio rowleyanus) and string of dolphins (Senecio peregrinus) share the same chemistry. Sibling articles cover string of pearls in cats, string of pearls in dogs, and the B113 article on ragwort in dogs. Knowing the family relationship makes the toxicology of any new Senecio species easy to predict.

Symptoms in Cats and Dogs

Acute signs typically begin within one to four hours of ingestion. Watch for:

• Drooling and pawing at the mouth
• Vomiting, sometimes with chewed banana-shaped leaf fragments
• Loss of appetite and reluctance to drink
• Diarrhea, often watery
• Lethargy and reduced interest in play
• Mild weakness or unsteadiness
• Skin irritation if the sap touched the face or paws and was groomed in

Chronic exposure signs are more insidious and may include progressive lethargy, weight loss, decreased appetite, vomiting, and eventually signs of liver dysfunction such as jaundice (yellow tinge to the gums or whites of the eyes). These signs can appear weeks to months after the actual chewing exposure. The chronic pattern is uncommon in well-supervised houseplant settings but worth knowing about, especially in homes where cats have ongoing access to multiple Senecio species.

How Much String of Bananas Is Dangerous?

There is no published toxic dose for Senecio radicans in cats or dogs. The bitterness of the sap and the small size of individual leaves provides some natural limit on how much most pets eat in one sitting. Most acute exposures involve a small handful of broken leaves chewed off a hanging basket, which usually produces self-limiting GI signs.

The risk increases sharply with quantity, with chronic repeated chewing, and in small pets. Kittens and puppies face higher relative risk per leaf eaten because of body weight. Pets with pre-existing liver disease are at higher cumulative-exposure risk because the liver detoxification pathway that handles PAs is the same pathway already under stress.

What to Do If Your Pet Ate String of Bananas

Step by step:

1. Remove the plant or move the pet to a different room so further chewing is impossible.
2. Sweep visible plant material from the mouth gently with a damp cloth. Do not force the jaw open.
3. Photograph the plant and any chewed leaves so the vet can confirm species. Capture an estimate of how many leaves are missing.
4. Note approximate quantity, time, and your pet’s body weight.
5. Call your vet, the ASPCA APCC at 888-426-4435, or Pet Poison Helpline at 855-764-7661.
6. Do not induce vomiting at home. Hydrogen peroxide is unsafe in cats and risky in dogs, and the decision belongs to a veterinarian.

For most pets with small acute ingestions, the vet’s guidance will be a watch-and-wait plan with clear instructions on when to escalate. For larger ingestions, in-clinic care with fluids and anti-emetics is often appropriate. Severe symptoms warrant a direct trip to the emergency clinic.

What the Vet Will Likely Do

Treatment for acute Senecio radicans exposure is supportive. Standard care typically includes: an exam to assess hydration, oral signs, and GI status; subcutaneous or intravenous fluids if vomiting and diarrhea have caused dehydration; anti-emetic medication; activated charcoal if ingestion was recent and the pet is alert enough to receive it; a bland diet for two to three days as the GI tract recovers.

For pets with sustained or repeated exposure, your vet may recommend baseline liver bloodwork and a follow-up panel several weeks later. Pyrrolizidine alkaloid hepatotoxicity is dose-dependent and time-dependent, and a single bloodwork snapshot does not always tell the whole story. Most acute exposures resolve completely. Chronic exposures with detectable liver value changes warrant referral to an internal medicine specialist.

Look-Alike and Name Confusion

The most important pitfall is the confusion between Senecio radicans (string of bananas) and Peperomia prostrata (string of turtles), covered in our sibling B114 article on string of turtles for pets. The two plants have similar trailing growth habits and similar marketing-friendly names, but they are in entirely different families with entirely different chemistry. String of turtles is a Peperomia and is generally considered non-toxic to pets. String of bananas is a Senecio and is toxic. Pet owners frequently search for the wrong species, and this single distinction prevents unnecessary panic and missed exposures.

Senecio radicans is also not the same as the unrelated banana plant (Musa species), the actual fruit-producing tree. Sibling B114 article on banana plants for pets covers Musa, which is generally considered non-toxic to pets. Banana fruit and banana plants are different from string of bananas. The shared word “banana” is purely a leaf-shape descriptor.

Within the Senecio genus, sibling B114 article on string of dolphins (Senecio peregrinus) and the existing articles on string of pearls in cats and string of pearls in dogs cover the closest relatives. The same article on string of hearts in cats covers a different unrelated trailing succulent that is also toxic for separate reasons.

Pet-Safer Trailing Houseplant Alternatives

If you love the cascading trailing houseplant look, several non-toxic alternatives give similar effect without the Senecio chemistry. Spider plants are the classic safer cascading houseplant. Hoya kerrii (sweetheart hoya) trails reasonably well in long forms. Various peperomia species, including string of turtles itself, trail and are generally considered non-toxic. Peperomia safe for cats covers options.

For trailing succulents specifically, Sedum morganianum (burro’s tail) is in the family Crassulaceae rather than Asteraceae and lacks PA chemistry. Rhipsalis varieties are non-toxic trailing cacti. Our cat-safe houseplants guide covers the trade-offs of each option, including light needs and ease of care.

Living With String of Bananas and a Pet

If you love your existing string of bananas, the practical safety strategy is high placement combined with monitored access. Hang the basket from a ceiling hook well above any cat launching point, including bookshelves, fridge tops, and curtain rods. Cats are remarkable jumpers, so the realistic test is whether the plant can be reached from any nearby surface, not just from the floor.

For dogs, especially small dogs, table-top placement creates the same risk pattern. Move the plant to a high shelf or hanging position. For households with motivated chewers, rehoming the plant to a friend’s place is often the simpler answer. Cats and dogs that chew houseplants tend to do so because they are bored, deficient in fiber, or under-stimulated. Offering a tray of cat grass or rotating chew toys redirects the chewing instinct toward something safe.

When to Skip the Wait-and-See

Take your pet to a vet immediately, not in the morning, if any of the following are true: a small pet ate a substantial amount of string of bananas; the pet is showing repeated vomiting that does not stop; the pet is a kitten, puppy, or senior; the pet has known liver disease; you suspect chronic repeated exposure over weeks. Liver effects from PA exposure are insidious enough that they sometimes deserve a baseline bloodwork even after acute exposures look mild.

For an otherwise healthy adult pet with a small acute leaf nibble, a phone call may be sufficient to confirm a watch-and-wait plan. Make the call rather than guessing, and ask whether your vet recommends baseline liver bloodwork given your pet’s overall health.

Sibling-Tier Hazards Worth Knowing

String of bananas is one of several Senecio succulents and Peperomia trailing plants that pet owners often own without realizing the chemistry. Sibling B114 articles cover string of turtles (Peperomia, safe), and the existing articles on string of pearls in cats and string of pearls in dogs cover the closest Senecio relatives.

The B113 article on ragwort in dogs covers the agricultural Senecio that built the family’s toxicology reputation. Reviewing it gives useful context for understanding why even mild houseplant Senecio exposures deserve a vet call rather than a shrug.

The Bigger Picture for Pet Households

The Senecio versus Peperomia distinction is a clean example of why plant identification matters more than common names. Two plants that look similar, share visually similar marketing names, and sit on the same Etsy product pages can have completely different toxicities. A houseplant collection that includes both can be reasonably pet-safe with the right cultivars in the right places, but the owner needs to know which is which.

If you are setting up a home for a new pet, our dog adoption hub and cat adoption hub include household-prep checklists. The houseplant portion of the checklist is increasingly relevant in the era of trendy succulent collections, and the time spent identifying every trailing plant on every shelf is well-spent insurance against an avoidable vet visit.

Frequently Asked Questions

How is string of bananas different from string of turtles for my cat?

They are different plants in different families. String of bananas is Senecio radicans, in the daisy family, and is toxic to cats. String of turtles is Peperomia prostrata, in the pepper family, and is generally considered non-toxic. The shared trailing habit and similar names cause confusion, but the chemistry is completely different.

How many string of bananas leaves are dangerous to a cat?

There is no published toxic dose. Most acute exposures involve a small handful of leaves and produce mild GI signs that resolve with supportive care. Treat any meaningful chewing as a vet call rather than guessing a safe number.

My cat has been nibbling at the plant for weeks before I noticed. What now?

Sustained or repeated Senecio exposure can produce cumulative liver effects that may not be visible without bloodwork. Schedule a vet visit and ask about baseline liver values. Most cases caught and stopped early have good outcomes.

Are the small white flowers safer or more dangerous than the leaves?

Pyrrolizidine alkaloids are present throughout the plant, including flowers. The relative concentrations vary, but no part of the plant should be considered safe. Treat all parts as toxic.

Can I keep string of bananas if I hang it high above my cat’s reach?

High placement is the most reasonable safety strategy if you want to keep the plant. The realistic test is whether the basket can be reached from any climbable surface in the room, not just from the floor. For motivated chewers, rehoming the plant is often the simpler answer.