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Arrowhead Plant
Syngonium spp.
Arrowhead Vine (Syngonium podophyllum) is a popular trailing houseplant that contains insoluble calcium oxalate crystals (raphides) — microscopic needle-like structures bundled in specialised cells throughout the leaves and stems. When a cat bites or chews any part of the plant, these crystals are forcibly ejected and physically penetrate the soft tissues of the mouth, tongue, and throat, causing immediate and intense irritation. Systemic toxicity is uncommon because the pain typically stops the cat from consuming a large amount.
Important Notes
Symptoms: Immediate oral pain, intense drooling, pawing at the mouth, swelling of the lips, tongue, and throat, and difficulty swallowing; vomiting may follow.
Rapid onset: Discomfort begins within seconds of chewing — this is the plant's natural defence mechanism.
Action: Rinse the cat's mouth with water to help flush crystals. Contact a vet if swelling is severe or symptoms do not resolve within an hour.
Potentially Toxic Parts
All parts of the plant
Possible Symptoms Reported in Cats
Swelling of the tongue, lips, and pharynx
Gastrointestinal · Rapid.
Dyspnea
Respiratory · Rapid (following swelling).
Oral Irritation (intense burning sensation, pain)
Gastrointestinal · Immediate upon chewing.
Excessive Drooling (Ptyalism)
Gastrointestinal · Immediate.
Vomiting and Diarrhea
Gastrointestinal
Loss of appetite
Gastrointestinal
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.