Winterberry Toxic?

Updated 2026-03-06| 3 min read| 1,801 found this helpful

Winterberry is confirmed toxic to cats, dogs, and horses per ASPCA toxicology data

Toxic effects are caused by saponin compounds present in accessible plant parts

Leaves and berries have low toxicity, typically causing only mild clinical signs if ingested

FAQ

Is Winterberry toxic to Humans?

No formal human toxicity data is documented, but ingestion may cause mild gastrointestinal upset consistent with saponin exposure (Low)

Is Winterberry toxic to Cats?

Vomiting, diarrhea, and depressive/lethargic behavior (Low)

Is Winterberry toxic to Dogs?

Vomiting, diarrhea, and depressive/lethargic behavior (Low)

Is Winterberry toxic to Horses?

Vomiting, diarrhea, and depressive/lethargic behavior (Low)

Not sure which plant? Snap a photo to ID in 1 secondGet App

Toxicity Details

Humans

Low

No formal human toxicity data is documented, but ingestion may cause mild gastrointestinal upset consistent with saponin exposure

Cats

Low

Vomiting, diarrhea, and depressive/lethargic behavior

Dogs

Low

Vomiting, diarrhea, and depressive/lethargic behavior

Horses

Low

Vomiting, diarrhea, and depressive/lethargic behavior

Toxicity Snapshot

Toxic PartsLeaves and berries

Exposure RoutePrimary route is ingestion of leaves or berries; skin contact may cause mild transient irritation in sensitive individuals

Toxic Compoundssaponins

First Aid & Prevention

First 30 Minutes

• Remove all remaining Winterberry plant material from the animal's mouth immediately
• Do not induce vomiting unless explicitly instructed to do so by a licensed veterinarian
• If the animal is alert and able to swallow, offer small amounts of fresh water to dilute ingested toxins

Contact Vet Immediately

• If your cat, dog, or horse has ingested any quantity of Winterberry plant material
• If you observe clinical signs including vomiting, diarrhea, or lethargy after potential exposure
• If you are uncertain of the amount of plant material your animal has consumed

Prevention

• Keep potted or cut Winterberry plants out of reach of cats, dogs, and horses
• Avoid planting Winterberry in pastures, yards, or animal enclosures accessible to at-risk species
• Label all household and garden plants to enable fast identification in case of accidental ingestion

Treatment & Prognosis

• Supportive care including fluid therapy to address dehydration caused by vomiting and diarrhea
• Prescription of anti-emetic medications to control persistent vomiting as directed by a veterinarian
• Monitoring of vital signs and clinical symptoms until the animal makes a full recovery

Emergency? Open PlantFun for real-time AI guidanceGet App

Professional Toxicology

Scientific NameIlex opaca

AliasesEnglish Holly、European Holly、Oregon Holly、Inkberry、American Holly

Toxicity Grade

HumansLow

CatsLow

DogsLow

HorsesLow

Target Organs

Gastrointestinal tractCentral nervous system (mild, transient effects)

Mechanism of Action

• Saponin compounds irritate the gastrointestinal mucosal lining, leading to gastrointestinal distress and mild depressive systemic effects

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle, sheep, and goats: Low toxicity expected; ingestion may lead to mild gastrointestinal distress including diarrhea and reduced appetite

Small companion mammals (rabbits, guinea pigs, hamsters): Sensitive to saponin irritation; ingestion may cause gastrointestinal stasis and distress in severe cases

Confusion Risk

The following plants look similar and may be confused:

Common Deciduous Winterberry Ilex verticillata

Both are sold under the common name 'winterberry' and produce bright red berries; Ilex verticillata is deciduous, while Ilex opaca is evergreen

European Holly Ilex aquifolium

Both have glossy, spiked evergreen leaves and red berries; European Holly has sharper leaf spines and slightly higher saponin concentrations

Use PlantFun to scan and avoid misidentificationGet App

Related Toxic Plants

European Holly

Ilex aquifolium

Low to Moderate toxicity

Yaupon Holly

Ilex vomitoria

Moderate toxicity

Inkberry Holly

Ilex glabra

Low toxicity

Download PlantFun App

Identify, grow and care for plants effectively!

Instant Plant ID

Take a photo to quickly identify plants.

Smart Care Reminders

Generate watering and care schedules.

Toxicity & Disease Diagnosis

Identify toxic plants and pests with treatment advice.

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.