Is eucalyptus toxic to cats?

Eucalyptus is toxic to cats (S2 Irritant): the ASPCA lists its eucalyptol essential oils as causing salivation, vomiting, diarrhea, depression, and weakness — and concentrated eucalyptus oil is far more dangerous than the leaves.

S2IRRITANT

TOXINessential oils (eucalyptol)
WHAT TO EXPECTsalivation; vomiting; diarrhea
CALL THE VETCall your vet if your cat shows depression, weakness, or persistent vomiting or diarrhea after eating leaves — and immediately for any exposure to concentrated eucalyptus essential oil.

S0S1S2S3S4

Symptoms

SIGN
salivation
vomiting
diarrhea
depression
weakness

If your cat just ate it

S2 PROTOCOL

Remove the sprig or arrangement out of reach. After a small leaf chew, offer water and watch closely — the signs to take seriously are lethargy or weakness, not just an upset stomach. Concentrated eucalyptus oil is a different tier: treat any oil exposure as urgent.

When to call the vet: Call your vet if your cat shows depression, weakness, or persistent vomiting or diarrhea after eating leaves — and immediately for any exposure to concentrated eucalyptus essential oil.

Same tabletop look, minus the risk

3 tabletop plants graded S0 — safe even for dedicated chewers.

Care at a glance

Lightdirect

Waterevery 3–7 days

Humiditylow

Difficulty●●○

FAQ

I have dried eucalyptus in a vase — does the verdict still apply?

Treat it the same as fresh. The ASPCA's entry covers Eucalyptus species ("many cultivars") without distinguishing fresh from dried — the toxic principle is the essential oil (eucalyptol) in the foliage itself. Pet Poison Helpline notes that "small ingestions of a few leaves or low concentration eucalyptus oil by pet animals cause minor nausea," so a chewed sprig from an arrangement is usually a mild event — but the listed signs go beyond a simple upset stomach, so keep arrangements out of batting range and watch any cat that has actually eaten leaves.

Is eucalyptus essential oil or a diffuser more dangerous than the plant?

Yes — concentration is the whole story. Pet Poison Helpline draws the line explicitly: a few leaves or low-concentration oil cause "minor nausea," while exposure to "highly concentrated eucalyptus essential oil can result in severe signs including neurologic abnormalities and rarely, kidney impairment." Animals can be exposed "by ingestion of eucalyptus leaves or herbal products containing essential oils." Keep concentrated oils, liquid potpourri, and anything a cat could lick off its fur out of the house or locked away — and call your vet immediately if a cat is exposed to concentrated oil.