✕ Toxic

Shamrock

Q: Is Shamrock toxic to cats?

Warning: Toxic. Shamrock (Oxalis species), also known as wood sorrel, is a common houseplant often mistaken for clover. While festive, it is toxic to cats because it contains soluble oxalate salts. These are different from the irritating crystals found in many other toxic plants. Unlike insoluble oxalates that cause immediate mouth pain, soluble oxalates are absorbed from the stomach into the bloodstream. Once in the blood, they bind with calcium, causing a sudden and dangerous drop in the body's available calcium. This condition, called hypocalcemia, can affect muscle function and overall stability. In cases of very large ingestions, these compounds can also form crystals in the kidneys, potentially leading to kidney damage. A cat that nibbles a small amount may only experience mild stomach upset, like vomiting or a temporary loss of appetite. However, eating a large quantity can lead to more serious signs like weakness, lethargy, and tremors. Keep shamrock plants away from cats, especially those that like to graze on greens. If a large amount is eaten, contact a veterinarian.

Oxalis spp.

Shamrock (Oxalis species), also known as wood sorrel, is a common houseplant often mistaken for clover. While festive, it is toxic to cats because it contains soluble oxalate salts. These are different from the irritating crystals found in many other toxic plants. Unlike insoluble oxalates that cause immediate mouth pain, soluble oxalates are absorbed from the stomach into the bloodstream. Once in the blood, they bind with calcium, causing a sudden and dangerous drop in the body's available calcium. This condition, called hypocalcemia, can affect muscle function and overall stability. In cases of very large ingestions, these compounds can also form crystals in the kidneys, potentially leading to kidney damage. A cat that nibbles a small amount may only experience mild stomach upset, like vomiting or a temporary loss of appetite. However, eating a large quantity can lead to more serious signs like weakness, lethargy, and tremors. Keep shamrock plants away from cats, especially those that like to graze on greens. If a large amount is eaten, contact a veterinarian.

Important Notes

Toxic compounds: soluble oxalate salts throughout the plant — leaves, stems, and bulbs

Mechanism: soluble oxalates bind free calcium in the blood (hypocalcaemia); chronic exposure causes kidney calcium oxalate crystal deposition

Symptoms: drooling, vomiting, diarrhea; large ingestion may cause tremors (from hypocalcaemia) or kidney issues

The small clover-like leaves are appealing to nibbling cats — keep out of reach

Occasional mild nibbling is usually self-limiting; contact your vet if large amounts were eaten

Potentially Toxic Parts

Entire Plant

Possible Symptoms Reported in Cats

Hypocalcemic tetany (manifesting as lethargy, extreme weakness, ataxia/incoordination, tremors, and seizures)

Neurological

Acute renal failure (manifesting as changes in thirst and urination, PU/PD [polyuria/polydipsia], bloody urine

Renal

Gastrointestinal distress (including drooling, vomiting, diarrhea, and inappetence/anorexia)

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.