Is Hydrangea Toxic to Cats?

Yes — Hydrangea is mildly toxic to cats

Hydrangeas contain small amounts of cyanogenic glycosides but serious poisoning is rare — pets would need to eat very large quantities. The bitter taste deters most animals from eating enough to cause serious harm.

Symptoms in Cats

If your cat eats Hydrangea, watch for these symptoms (onset: 2-6 hours):

Vomiting
Diarrhea
Lethargy
Depression

What To Do

Monitor at home for mild cases. Large ingestion is unlikely due to bitter taste. See vet if symptoms persist.

Cat-Safe Alternatives to Hydrangea

✓ Sunflower ✓ Rose ✓ Snapdragon

Quick Facts

Scientific Name

Hydrangea macrophylla

Also Toxic to Dogs?

Yes (mild)

Toxic Compound

Cyanogenic glycosides (hydrangin)

Toxic Parts

leaves, flower buds

Sources: ASPCA Animal Poison Control Center, Pet Poison Helpline. View full Hydrangea toxicity profile.