Cats
Potentially toxicConsulted references classify the plant as toxic or irritating for that pet type.
Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.
Sources
cat safety reference
Is Milkweed safe for cats?
Asclepias species
Milkweed is a diverse genus of herbaceous perennials known for their milky sap and importance to pollinators. All parts of the plant are considered toxic to pets due to the presence of cardiac glycosides.
AsclepiasAsclepias speciesButterfly WeedMilkweed
- Light
- Full sun
- Habit
- Upright herbaceous perennial
- Care
- Low
Safety status
What this means for your cat
Milkweed is a serious problem for cats. Every part of the plant carries cardiac glycosides (cardenolides) that interfere with the heart's electrolyte balance, and some Asclepias species also contain neurotoxins. Cats are most at risk indirectly — by eating monarch caterpillars or butterflies that have fed on milkweed — but chewing the plant itself is also dangerous.
What to watch for
Early signs: vomiting, profound depression, weakness, anorexia, diarrhea. Progression to severe: seizures, difficulty breathing, rapid weak pulse, dilated pupils, kidney or liver failure, coma, respiratory paralysis, and death. Treat any milkweed exposure as potentially severe — not mild GI upset.
Time window
ASPCA reports onset of clinical signs within the first 2 hours after exposure, with signs persisting up to 4–5 days. Pet Poison Helpline notes most pets recover within a day or two of receiving treatment.
When to call the vet
Call immediately. Don't wait for symptoms — call your vet, the ASPCA APCC (888-426-4435), or Pet Poison Helpline (855-764-7661) the moment you suspect ingestion. This plant can cause cardiac arrhythmias; early treatment matters.
First aid at home
Remove your cat from the plant and take any leaves or sap out of the mouth. Do NOT induce vomiting unless explicitly told to by a veterinarian or Pet Poison Helpline — your vet may use activated charcoal or controlled emesis depending on timing. Bring a sample or photo of the plant to the clinic.
Sources: ASPCA, Pet Poison Helpline.
If a pet has chewed or swallowed plant material and is showing symptoms, contact a veterinarian or poison resource immediately. This product is for structured reference, not diagnosis.
Cats — concern notes
Common signs
Vomiting, diarrhea, weakness, difficulty breathing, and in severe cases, cardiac arrhythmias or tremors.
Escalation note
Ingestion can lead to serious systemic effects due to cardiac glycosides. Please contact your veterinarian or an animal poison control center immediately if ingestion is suspected.
Safer alternatives
No hand-picked alternatives for this plant yet. You can still pick your own using the Compare button on any other plant.
Source evidence
ASPCA Toxic Plant List
toxicology · 99% reliability
Milkweed contains cardiac glycosides which can cause vomiting, diarrhea, and heart rhythm abnormalities in pets.
NC State Extension Plant Toolbox
botanical · 94% reliability
Asclepias species are known for their milky latex sap and are toxic to humans and animals if ingested.
Same cat verdict
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