Wisteria Toxic?

Updated 2026-03-06| 2 min read| 1,359 found this helpful

Wisteria spp.

Wisteria is classified as toxic to cats, dogs, and horses per official ASPCA data

Its toxic active components are the compounds lectin and wisterin glycoside

Ingestion typically causes vomiting (sometimes with blood), diarrhea, and lethargy

FAQ

Is Wisteria toxic to Humans?

Not formally documented in ASPCA datasets, but gastrointestinal distress including vomiting, diarrhea, and abdominal pain is expected if large quantities are ingested (Low)

Is Wisteria toxic to Cats?

Vomiting (occasionally with blood), diarrhea, depression/lethargy (Moderate)

Is Wisteria toxic to Dogs?

Vomiting (occasionally with blood), diarrhea, depression/lethargy (Moderate)

Is Wisteria toxic to Horses?

Vomiting (occasionally with blood), diarrhea, depression/lethargy (Moderate)

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Toxicity Details

Humans

Low

Not formally documented in ASPCA datasets, but gastrointestinal distress including vomiting, diarrhea, and abdominal pain is expected if large quantities are ingested

Cats

Moderate

Vomiting (occasionally with blood), diarrhea, depression/lethargy

Dogs

Moderate

Vomiting (occasionally with blood), diarrhea, depression/lethargy

Horses

Moderate

Vomiting (occasionally with blood), diarrhea, depression/lethargy

Toxicity Snapshot

Toxic PartsAll plant parts are toxic, with the highest concentration of harmful compounds found in seeds and mature seed pods

Exposure RoutePrimary exposure route is ingestion of plant material; mild skin irritation may occur in sensitive individuals after prolonged contact

Toxic CompoundsLectin; Wisterin glycoside

First Aid & Prevention

First 30 Minutes

• Remove all remaining wisteria material from the exposed animal's mouth and surrounding area immediately
• Induce vomiting only if explicitly instructed to do so by a veterinarian or animal poison control professional
• Rinse the animal's mouth with cool clean water to remove residual plant residue

Contact Vet Immediately

• Your cat, dog, or horse has ingested any quantity of wisteria plant material
• You observe symptoms including bloody vomiting, persistent diarrhea, or unusual lethargy after potential exposure
• Gastrointestinal symptoms last more than 1 hour after suspected exposure

Prevention

• Keep potted or planted wisteria out of reach of pets, and regularly clear fallen seed pods from accessible areas
• Avoid planting wisteria in pastures or grazing areas accessible to horses or other livestock
• Educate all household members and animal caregivers to recognize wisteria and avoid feeding any part of the plant to animals

Treatment & Prognosis

• Veterinarians may administer activated charcoal to bind unabsorbed toxic compounds in the gastrointestinal tract
• Supportive care including IV fluid therapy may be provided to prevent dehydration from vomiting and diarrhea
• Symptomatic treatment for gastrointestinal inflammation and ongoing monitoring for secondary complications will be provided as needed

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Professional Toxicology

Scientific NameWisteria spp.

AliasesChinese Wisteria、Japanese Wisteria、American Wisteria

Toxicity Grade

HumansLow

CatsModerate

DogsModerate

HorsesModerate

Target Organs

Gastrointestinal tractStomachIntestinesCentral nervous system

Mechanism of Action

• Wisterin glycoside irritates the gastrointestinal mucosal lining, leading to inflammation, bleeding, and digestive distress

• Lectin binds to intestinal cell surfaces, disrupting nutrient absorption and worsening gastrointestinal inflammation

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Expected to develop similar gastrointestinal distress if wisteria is ingested, as toxic compounds affect most mammalian species

Sheep and Goats: Low ingestion risk under normal grazing conditions, but large quantities may trigger vomiting, diarrhea, and lethargy

Small Companion Mammals (rabbits, guinea pigs, hamsters): High sensitivity, even small amounts of ingested wisteria may lead to severe gastrointestinal complications and death without prompt treatment

Confusion Risk

The following plants look similar and may be confused:

Trumpet Vine Campsis radicans

Both have climbing growth habits and showy clustered flowers; trumpet vine produces bright orange/red tubular flowers, while wisteria has purple/white drooping flower racemes

Black Locust Robinia pseudoacacia

Both are Fabaceae family members with similar flat seed pods; black locust has upright white fragrant flower clusters, while wisteria flowers hang in long, drooping clusters

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Related Toxic Plants

Golden Chain Tree

Laburnum anagyroides

High toxicity

Black Locust

Robinia pseudoacacia

Moderate to High toxicity

Lupine

Lupinus spp.

Moderate toxicity

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Data Sources

1. ASPCA Animal Poison Control

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.

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