Plants / Cornflower / cats

Is Cornflower toxic to cats?

Cornflower (Centaurea cyanus) is non-toxic to cats (S0 Safe): the ASPCA lists this species as non-toxic, and Pet Poison Helpline says ingestion of large amounts may cause mild nausea with emesis.

  • TOXINnone — no toxic principles on record
  • WHAT TO EXPECTMild nausea with emesis after ingestion of large amounts (PPH)
  • CALL THE VETSee a vet if unusual or persistent symptoms follow ingestion.
S0S1S2S3S4

Symptoms

SIGNONSET
Mild nausea with emesis after ingestion of large amounts (PPH)Not specified by source

Nothing to do — really

S0 PROTOCOL
1
No action needed. Cornflower (Centaurea cyanus) is safe to keep around cats.
2
When to call the vet: See a vet if unusual or persistent symptoms follow ingestion.

Care at a glance

Lightdirect
Waterevery 2–3 days
Humiditymedium
Difficulty●●○

FAQ

Is Cornflower safe for cats?

Yes, for Centaurea cyanus: S0 Safe. The ASPCA's Bachelors Buttons, Bluebottle, and Cornflower entries all list "Non-Toxic to Cats". Pet Poison Helpline calls ornamental Cornflower non-toxic but says ingestion of large amounts may cause mild nausea with emesis.

What does Pet Poison Helpline say about eating large amounts of Cornflower?

Its Cornflower entry states: "Ornamental Cornflower is non-toxic; however, ingestion of large amounts of this plant may cause mild nausea with emesis." The entry gives the scientific name "Centaurea cyanus". The large-amount condition belongs with the mild nausea and emesis it describes.

Which plant does this Cornflower verdict cover?

Centaurea cyanus. The ASPCA's Bachelors Buttons, Bluebottle, and Cornflower entries and Pet Poison Helpline's Cornflower entry all give that scientific name. This verdict covers that species. Plants with other scientific names are not covered or graded here. Check the full scientific name on the tag.

Does this Cornflower verdict also cover Yellow Star Thistle or Russian Knapweed?

No. Pet Poison Helpline's Cornflower entry names "Centaurea cyanus" and says it is not to be confused with Yellow Star Thistle (Centaurea solstitialis) or Russian Knapweed (Rhaponicum (old genus: Centaurea) repens). Those plants are outside this page's verdict and are not graded here.

CITE THIS PAGE

Verdapaw Plant × Pet Safety Index, verdapaw.com/plants/cornflower, reviewed 2026-10-20