Black-eyed Susan Toxic?

Updated 2026-03-06| 3 min read| 4,945 found this helpful

No confirmed animal poisoning events associated with this plant have been recorded in peer-reviewed literature to date.

All parts of Rudbeckia hirta are not recommended or approved for use as feed for any pet or livestock species.

The plant can be easily confused with related species with varying toxicity, including highly toxic Pericallis hybrids.

FAQ

Is Black-eyed Susan toxic to Humans?

No confirmed toxic symptoms reported; seek medical care if unusual reactions like rashes or gastrointestinal distress occur after exposure. (Non-toxic)

Is Black-eyed Susan toxic to Cats?

No confirmed toxic symptoms reported; monitor for lethargy, vomiting or appetite loss if ingested, contact a vet if concerns arise. (Non-toxic)

Is Black-eyed Susan toxic to Dogs?

No confirmed toxic symptoms reported; monitor for lethargy, vomiting or appetite loss if ingested, contact a vet if concerns arise. (Non-toxic)

Is Black-eyed Susan toxic to Horses?

No confirmed toxic symptoms reported; monitor for unusual behavior or digestive upset if ingested, contact a vet if concerns arise. (Non-toxic)

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Toxicity Details

Humans

Non-toxic

No confirmed toxic symptoms reported; seek medical care if unusual reactions like rashes or gastrointestinal distress occur after exposure.

Cats

Non-toxic

No confirmed toxic symptoms reported; monitor for lethargy, vomiting or appetite loss if ingested, contact a vet if concerns arise.

Dogs

Non-toxic

No confirmed toxic symptoms reported; monitor for lethargy, vomiting or appetite loss if ingested, contact a vet if concerns arise.

Horses

Non-toxic

No confirmed toxic symptoms reported; monitor for unusual behavior or digestive upset if ingested, contact a vet if concerns arise.

Toxicity Snapshot

Toxic PartsNo toxic plant parts confirmed via published poisoning reports; the entire plant is unsuitable for use as animal feed.

Exposure RouteIngestion (primary exposure risk); no confirmed skin irritation or other exposure routes reported to date.

Toxic CompoundsNo toxic active compounds have been formally identified for this species to date.

First Aid & Prevention

First 30 Minutes

• Remove any remaining plant material from the mouth/skin of the exposed human or animal immediately.
• Rinse the affected area (mouth, skin) thoroughly with clean, cool water to eliminate residual plant matter.
• Monitor the exposed subject for any unusual symptoms for 24 hours following exposure.

Contact Vet Immediately

• If the exposed animal exhibits persistent vomiting, diarrhea, or lethargy after suspected ingestion.
• If a large quantity of the plant was consumed, even if no immediate symptoms are present.
• If you cannot confirm the ingested plant is Rudbeckia hirta and suspect it may be a toxic lookalike species.

Prevention

• Avoid planting Rudbeckia hirta in areas accessible to unsupervised pets or grazing livestock.
• Never harvest or feed this plant to any animal as forage or supplemental feed.
• Learn to distinguish Rudbeckia hirta from toxic related species to avoid dangerous misidentification.

Treatment & Prognosis

• Provide supportive care for any presenting symptoms as recommended by a medical or veterinary professional.
• If exposure was to a misidentified toxic lookalike, follow treatment protocols specific to that toxic species.

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Professional Toxicology

Scientific NameRudbeckia hirta L.

AliasesBlackeyed Susan、Rauer Sonnenhut (German)、Raue Rudbeckie (German)、Schwarzäugige Rudbeckie (German)、Rudbeckie hérissée (French)、Rudbeckia scabra (Italian)

Toxicity Grade

HumansNon-toxic

CatsNon-toxic

DogsNon-toxic

HorsesNon-toxic

Target Organs

No target organs for toxicity have been confirmed for this species to date

Mechanism of Action

• No toxic mechanism has been identified for this species, as no confirmed poisoning events have been recorded.

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Grazing livestock (cattle, sheep, goats): No confirmed poisoning cases reported, but consumption is not recommended as the plant is not suitable for feed.

Small companion mammals (rabbits, guinea pigs, hamsters): No specific toxicity data available; avoid feeding this plant to small mammals to prevent unknown adverse effects.

Confusion Risk

The following plants look similar and may be confused:

Other Rudbeckia species Rudbeckia spp.

Visually very similar to Rudbeckia hirta; toxicity ranges from non-toxic to toxic, so 100% positive identification is critical before any exposure.

Aster species Aster spp.

Similar composite daisy-like flower structure; all common Aster species are confirmed non-toxic.

Purple coneflower Echinacea purpurea

Similar central cone and petal structure; confirmed non-toxic for humans and animals.

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Related Toxic Plants

Common ragwort

Jacobaea vulgaris

Severe toxicity; causes irreversible liver damage in all species if ingested

Cineraria

Pericallis hybrida

High toxicity; causes severe gastrointestinal and organ damage in pets and humans

Common tansy

Tanacetum vulgare

Moderate toxicity; causes gastrointestinal distress, liver damage, and neurological symptoms in large doses

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Data Sources

1. CliniTox (Universität Zürich)

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