Sego Lily Toxic?

Updated 2026-03-06| 2 min read| 2,172 found this helpful
Calochortus gunnisonii
1

Confirmed non-toxic to cats and dogs per ASPCA guidelines, with no reported harmful effects from typical ingestion

2

Toxicity risk to horses is unconfirmed, as no formal studies of equine exposure to this species have been completed

3

No toxic principles have been identified in this plant, as it is categorized as non-poisonous for common companion animals

FAQ

Is Sego Lily toxic to Humans?

No confirmed toxic ingestion symptoms reported in humans; mild temporary gastrointestinal discomfort may occur in rare cases of excessive consumption (Non-toxic)

Is Sego Lily toxic to Cats?

No toxic symptoms expected, as the plant is confirmed non-toxic to cats (Non-toxic)

Is Sego Lily toxic to Dogs?

No toxic symptoms expected, as the plant is confirmed non-toxic to dogs (Non-toxic)

Is Sego Lily toxic to Horses?

No confirmed symptoms documented, as toxicity status for horses is currently unknown (Unknown)

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Toxicity Details

Humans
Non-toxic

No confirmed toxic ingestion symptoms reported in humans; mild temporary gastrointestinal discomfort may occur in rare cases of excessive consumption

Cats
Non-toxic

No toxic symptoms expected, as the plant is confirmed non-toxic to cats

Dogs
Non-toxic

No toxic symptoms expected, as the plant is confirmed non-toxic to dogs

Horses
Unknown

No confirmed symptoms documented, as toxicity status for horses is currently unknown

Toxicity Snapshot

Toxic PartsNo plant parts are known to be toxic to cats or dogs; toxic parts for horses are unconfirmed
Exposure RouteIngestion, skin contact (no adverse effects reported for either route in cats and dogs)
Toxic CompoundsNo confirmed toxic compounds identified; the plant is classified as non-toxic per ASPCA assessments

First Aid & Prevention

First 30 Minutes

  • • If ingested by a cat or dog, rinse out the animal's mouth with clean water to remove remaining plant residue
  • • Monitor for rare mild stomach upset (e.g. loose stools) for 24 hours post-ingestion
  • • Document the amount of plant consumed if unusual symptoms appear to share with a veterinarian

Contact Vet Immediately

  • • If your animal exhibits persistent vomiting, diarrhea, or lethargy post-ingestion
  • • If a horse consumes large quantities of the plant, as equine toxicity is unconfirmed
  • • If you are unsure if the ingested plant is correctly identified as Sego Lily

Prevention

  • • Avoid allowing horses to graze on Sego Lily until formal equine safety studies are completed
  • • Learn to distinguish Sego Lily from visually similar toxic Liliaceae family plants to avoid misidentification
  • • Store unknown decorative lily species out of reach of companion animals to prevent accidental poisoning from lookalikes

Treatment & Prognosis

  • • Supportive care only if mild gastrointestinal symptoms occur, including access to fresh water and rest
  • • No specific antidote is required as no toxic compounds are present in this species
  • • Veterinary evaluation is only needed if persistent abnormal symptoms develop post-exposure
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Professional Toxicology

Scientific NameCalochortus gunnisonii
AliasesMariposa Lily
Toxicity Grade
HumansNon-toxic
CatsNon-toxic
DogsNon-toxic
HorsesUnknown
Target Organs
No organs are known to be damaged by ingestion of this plant
Mechanism of Action

• No toxic mechanism identified, as the plant does not contain known harmful compounds for cats or dogs

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: No confirmed toxicity data available; grazing large quantities is not recommended until safety is verified
Sheep: No confirmed toxicity data available; exposure risk is presumed low per data from related non-toxic Calochortus species
Small companion mammals (rabbits, guinea pigs): No confirmed toxic effects reported; minor gastrointestinal upset may occur with excessive ingestion
Confusion Risk

The following plants look similar and may be confused:

Death Camas Zigadenus elegans
Visually similar due to shared white lily-like flowers and grassland habitat; Death Camas has long narrow basal leaves without Sego Lily's distinct segmented petals, and is highly toxic to all mammals
Autumn Crocus Colchicum autumnale
Similar cup-shaped flower structure to Sego Lily; Autumn Crocus blooms in fall rather than summer, and contains toxic colchicine that causes severe organ damage if ingested
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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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