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Toxic Cat Plants
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Is Flag toxic to cats?

YES (TOXIC)
Unfortunately, Flag is toxic and potentially harmful to cats. We recommend you keep your feline friends away from this plant. See the table below for more information.
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Additional Names:Iris, Snake Lily, Water Flag
Scientific Name:Iris species
Family:Iridaceae
Toxic Principles:Pentacylic terpenoids (zeorin, missourin and missouriensin)
Clinical Signs:Salivation, vomiting, drooling,lethargy, diarrhea. Highest concentration in rhizomes.
If you think your cat may have ingested a poisonous substance, call 888 426 4435 or your local vet
Detailed Write-up
Author:
Alec
Last Updated:
7/13/25

Is Flag Toxic to Cats?

Cats are one of the most popular pets worldwide and are found in almost every household. As pet owners, it's our responsibility to ensure that our furry friends are healthy and safe. However, with so much information available on the internet, it can be challenging to separate fact from fiction.

The Flag Plant

Flag (Iris versicolor) is a beautiful, flowering plant native to North America. It is also known as blue flag, wild iris, or harlequin blueflag and is commonly found growing in wetlands alongside lakes, rivers, and streams.

Why Do Cats Eat Plants?

Cats are primarily carnivorous, meaning they obtain nutrients from animal sources. However, they also have a natural instinct to consume plants, referred to as zoopharmacognosy. This instinct helps them to cleanse their digestive system and supplement their diet with essential minerals and vitamins.

Is Flag Toxic to Cats?

Many plants are toxic to cats, and consumption can cause mild to severe symptoms, including vomiting, diarrhea, abdominal pain, and even death. However, flag plant is not toxic to cats.

In a study conducted by the ASPCA Animal Poison Control Center, flag plant was found to be non-toxic to both dogs and cats. This means that if your cat ingests some flag plant, it is unlikely to cause any harm, but it's always best to monitor your pet for any symptoms.

Other Common Household Plants Toxic to Cats

While flag plant is non-toxic, there are many other common household plants that are toxic to cats. Here are a few:

  • Lilies (Lilium spp.)
  • Pothos (Epipremnum aureum)
  • Philodendron (Philodendron spp.)
  • Dieffenbachia (Dieffenbachia spp.)
  • Snake Plant (Sansevieria trifasciata)

These plants contain chemicals that can cause a range of symptoms, from mild GI upset to severe renal failure. If you suspect your cat has ingested any of these plants, seek immediate veterinary attention.

Preventing Plant Toxicity in Cats

Prevention is always better than cure, and there are several measures you can take to ensure your cat's safety:

  • Keep toxic plants out of reach
  • Train your cat not to eat plants
  • Consider using non-toxic plant substitutes
  • Supervise your cat when outdoors

Conclusion

Flag plants are non-toxic to cats, and if your cat ingests some, it is unlikely to cause any harm. However, there are many other common household plants that can be toxic to cats, and it's essential to take preventive measures to ensure your furry friend's safety. If you suspect your cat has ingested a toxic plant, seek immediate veterinary attention.

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