Is cornflower (Centaurea cyanus) toxic to pets?

Cornflower (Centaurea cyanus) is confirmed non-toxic to cats and dogs per ASPCA data. Its toxicity to horses remains unconfirmed. It is generally considered safe around most household pets.

Cornflower Toxic?

Updated 2026-03-06| 4 min read| 1,924 found this helpful

Cornflower is confirmed non-toxic for cats and dogs, with no associated harmful effects from accidental ingestion.

No formal data is available on cornflower toxicity for horses, so access should be restricted as a precaution.

No severe toxic effects in humans are linked to casual contact or small amounts of accidental cornflower ingestion.

FAQ

Is Cornflower toxic to Humans?

No adverse symptoms expected from casual contact or small ingestion; very large consumption may rarely cause mild gastrointestinal upset. (Non-toxic)

Is Cornflower toxic to Cats?

No toxic symptoms expected, as cornflower is confirmed non-toxic to feline species. (Non-toxic)

Is Cornflower toxic to Dogs?

No toxic symptoms expected, as cornflower is confirmed non-toxic to canine species. (Non-toxic)

Is Cornflower toxic to Horses?

Symptoms are unconfirmed due to lack of toxicity data; monitor for digestive upset or unusual behavior if large quantities are ingested. (Unknown)

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Toxicity Details

Humans

Non-toxic

No adverse symptoms expected from casual contact or small ingestion; very large consumption may rarely cause mild gastrointestinal upset.

Cats

Non-toxic

No toxic symptoms expected, as cornflower is confirmed non-toxic to feline species.

Dogs

Non-toxic

No toxic symptoms expected, as cornflower is confirmed non-toxic to canine species.

Horses

Unknown

Symptoms are unconfirmed due to lack of toxicity data; monitor for digestive upset or unusual behavior if large quantities are ingested.

Toxicity Snapshot

Toxic PartsNo toxic parts identified for cats and dogs; potential toxic parts for horses are unstudied.

Exposure RouteIngestion, dermal contact; no harmful effects confirmed for either route in cats and dogs.

Toxic CompoundsNo confirmed toxic compounds associated with adverse effects in companion animals are documented for this species

First Aid & Prevention

First 30 Minutes

• For cat/dog ingestion: No immediate action is required unless your pet shows signs of unrelated allergy or discomfort.
• For horse ingestion: Remove remaining plant access and monitor the animal for 2 to 4 hours for unusual symptoms.
• For human large ingestion: Rinse mouth with water, consume small amounts of fluids, and monitor for mild stomach upset.

Contact Vet Immediately

• Your horse ingests large amounts of cornflower and shows signs of colic, lethargy, or loss of appetite.
• Your cat or dog shows persistent unusual symptoms after ingestion, which may indicate an unrelated sensitivity.
• You are unsure of the quantity of cornflower ingested by your horse or other livestock animal.

Prevention

• Limit access to cornflower plants for horses until formal equine toxicity data is published.
• Confirm plant identification before allowing pets or livestock to forage in areas with wild cornflower growth.
• Keep cut cornflower arrangements out of reach of curious horses as a precautionary measure.

Treatment & Prognosis

• No specific treatment is required for non-toxic ingestion in cats and dogs; supportive care may be provided for unrelated mild allergy symptoms.
• For horses showing adverse symptoms after ingestion, provide symptomatic supportive care as directed by a licensed veterinarian.
• For humans experiencing persistent gastrointestinal upset after large ingestion, seek medical advice for symptomatic treatment.

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Professional Toxicology

Scientific NameCentaurea cyanus

AliasesBachelor's Buttons、Bluebottle

Toxicity Grade

HumansNon-toxic

CatsNon-toxic

DogsNon-toxic

HorsesUnknown

Target Organs

No target organs for toxic effects identified in cats and dogs; potential target organs in horses are unconfirmed

Mechanism of Action

• No toxic mechanism identified for cats and dogs; potential mechanism of toxicity in horses is unstudied and unknown

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Toxicity unconfirmed, no formal studies documenting adverse effects from ingestion to date

Sheep: Toxicity unconfirmed, casual grazing has not been linked to any reported health issues

Domestic Rabbits: Considered non-toxic, commonly included in small pet forage mixes with no reported adverse effects

Confusion Risk

The following plants look similar and may be confused:

Blueweed Echium vulgare

Both produce bright blue upright flowers; cornflower has soft, frayed papery bracts, while blueweed has coarse hairy stems and spotted petals, and is toxic to livestock.

Chicory Cichorium intybus

Both have blue composite flowers on upright stems; chicory flowers are paler blue and open only in the morning, while cornflower flowers stay open and vibrant all day.

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Related Toxic Plants

Common Ragwort

Jacobaea vulgaris

Severe toxicity, causes irreversible liver damage in all animals and humans

Common Tansy

Tanacetum vulgare

Moderate toxicity, causes gastrointestinal upset and liver damage in large doses

Florist's Chrysanthemum

Chrysanthemum × morifolium

Low to moderate toxicity, causes contact dermatitis and mild digestive upset in pets

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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.