Lemon Grass Toxic?

Updated 2026-03-06| 4 min read| 4,537 found this helpful
Lemon Grass
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Lemon grass is confirmed toxic to cats, dogs, and horses per ASPCA data

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Its core toxic components are essential oils and cyanogenic glycosides

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Rare fatal outcomes have been recorded in horses exposed to the plant

FAQ

Is Lemon Grass toxic to Humans?

No confirmed human toxicity data is provided; the plant is generally safe for culinary use, but consult a doctor if adverse reactions occur (Non-toxic)

Is Lemon Grass toxic to Cats?

Mild to moderate stomach upset including vomiting, diarrhea, and abdominal pain (Low)

Is Lemon Grass toxic to Dogs?

Mild to moderate stomach upset including vomiting, diarrhea, and abdominal pain (Low)

Is Lemon Grass toxic to Horses?

Difficulty breathing, generalized weakness, and rare fatal outcomes (Moderate)

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Toxicity Details

Humans
Non-toxic

No confirmed human toxicity data is provided; the plant is generally safe for culinary use, but consult a doctor if adverse reactions occur

Cats
Low

Mild to moderate stomach upset including vomiting, diarrhea, and abdominal pain

Dogs
Low

Mild to moderate stomach upset including vomiting, diarrhea, and abdominal pain

Horses
Moderate

Difficulty breathing, generalized weakness, and rare fatal outcomes

Toxicity Snapshot

Toxic PartsAll fresh, dried, and processed plant parts, including extracted essential oils, are considered potentially toxic
Exposure RoutePrimary exposure route is ingestion; dermal contact with concentrated essential oils may also trigger adverse reactions
Toxic CompoundsEssential oils; Cyanogenic glycosides

First Aid & Prevention

First 30 Minutes

  • • Remove any remaining lemon grass material from the exposed animal's mouth immediately and rinse their mouth with clean cool water
  • • Avoid inducing vomiting unless explicitly directed to do so by a licensed veterinarian
  • • Collect a sample of the ingested plant to provide to veterinary staff for fast, accurate identification

Contact Vet Immediately

  • • Your cat, dog, or horse has ingested any amount of lemon grass
  • • Your animal shows symptoms such as stomach upset, difficulty breathing, or weakness post-exposure
  • • Your horse has had known access to large quantities of lemon grass, even if no symptoms are present

Prevention

  • • Keep potted or harvested lemon grass out of reach of household pets and pastured horses
  • • Avoid using undiluted lemon grass essential oil products around unsupervised pets
  • • Inspect horse pastures regularly to remove any wild-growing lemon grass specimens

Treatment & Prognosis

  • • Veterinarians may administer activated charcoal for recent ingestions to reduce toxin absorption
  • • Symptomatic care including anti-emetics, fluid therapy, and respiratory support may be provided as needed
  • • Horses may be monitored for signs of cyanide toxicity after large volume ingestions
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Professional Toxicology

Scientific NameCymbopogon citratus
AliasesOil Grass
Toxicity Grade
HumansNon-toxic
CatsLow
DogsLow
HorsesModerate
Target Organs
Gastrointestinal tractRespiratory systemCardiovascular system
Mechanism of Action

• Essential oils irritate the gastrointestinal tract lining, causing digestive upset in cats and dogs

• Cyanogenic glycosides metabolize to release cyanide in the body, leading to respiratory impairment and systemic toxicity in horses

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: No specific toxicity data provided; at potential risk of cyanide poisoning from cyanogenic glycosides, similar to horses
Small companion mammals (rabbits, guinea pigs): No specific toxicity data provided; ingestion may cause mild to moderate gastrointestinal upset
Confusion Risk

The following plants look similar and may be confused:

Citronella Grass Cymbopogon nardus
Visually identical to lemon grass with long narrow green blades; key difference is its pungent insect-repellent scent, compared to lemon grass's bright citrus aroma when crushed
Sweet Grass Hierochloe odorata
Similar long slender green leaf structure to lemon grass; key difference is its characteristic sweet vanilla-like scent, unlike the citrus scent of lemon grass
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Related Toxic Plants

Common Sorghum
Common Sorghum
Sorghum bicolor
Moderate toxicity, can cause cyanide poisoning in grazing livestock
Johnson Grass
Johnson Grass
Sorghum halepense
High toxicity, linked to fatal cyanide poisoning in horses and cattle
Endophyte-Infected Perennial Ryegrass
Endophyte-Infected Perennial Ryegrass
Lolium perenne
Moderate toxicity, causes neurological and gastrointestinal distress in grazing animals

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Data Sources

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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