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Is Hydrangea 'Endless Summer' toxic to cats?

Hydrangea macrophylla 'Endless Summer'

Toxic to cats

Yes — hydrangea 'endless summer' is toxic to cats according to the ASPCA. Keep it well away from any cat that chews plants; reactions can be significant. This classification follows the ASPCA Toxic and Non-Toxic Plant List. ASPCA-lists Hydrangea as toxic to cats, dogs, and horses. Leaves, buds and flowers contain a cyanogenic glycoside (hydrangin) that releases cyanide when chewed. Ingestion typically causes vomiting, diarrhoea and lethargy; large amounts pose a more serious risk. Keep clippings and fallen blooms away from pets.

What to do if your cat ate hydrangea 'endless summer'

  1. Remove any plant material from your cat's mouth and move hydrangea 'endless summer' out of reach.
  2. Note how much was eaten and when, and watch for drooling, vomiting, or lethargy.
  3. Do not induce vomiting unless a vet or poison-control specialist instructs you to.
  4. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice.
  5. Bring a leaf or photo of hydrangea 'endless summer' to the appointment so it can be treated correctly.

General guidance, not veterinary advice. If you think your cat has eaten hydrangea 'endless summer', contact your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — do not wait for symptoms to worsen.

Is hydrangea 'endless summer' toxic to cats? — FAQ

Is hydrangea 'endless summer' toxic to cats?

Yes — hydrangea 'endless summer' is toxic to cats according to the ASPCA. Keep it well away from any cat that chews plants; reactions can be significant. ASPCA-lists Hydrangea as toxic to cats, dogs, and horses. Leaves, buds and flowers contain a cyanogenic glycoside (hydrangin) that releases cyanide when chewed. Ingestion typically causes vomiting, diarrhoea and lethargy; large amounts pose a more serious risk. Keep clippings and fallen blooms away from pets.

What are the symptoms if a cat eats hydrangea 'endless summer'?

ASPCA-lists Hydrangea as toxic to cats, dogs, and horses. Leaves, buds and flowers contain a cyanogenic glycoside (hydrangin) that releases cyanide when chewed. Ingestion typically causes vomiting, diarrhoea and lethargy; large amounts pose a more serious risk. Keep clippings and fallen blooms away from pets. Signs usually appear soon after chewing rather than hours later — watch for drooling, pawing at the mouth, vomiting, loss of appetite, or unusual lethargy after your cat has had access to hydrangea 'endless summer'.

What should I do if my cat ate hydrangea 'endless summer'?

Stay calm. Remove any plant from your cat's mouth and take the plant away. Note how much was eaten and when, and do not induce vomiting unless told to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice; a leaf or photo helps the vet treat it correctly.

Is hydrangea 'endless summer' toxic to dogs too?

The ASPCA classification Growli uses applies to both cats and dogs: Hydrangea 'Endless Summer' is toxic to dogs as well. See the full hydrangea 'endless summer' pet-safety guide for both species.

What is a cat-safe alternative to hydrangea 'endless summer'?

For a similar look without the risk, see the best cats-safe plants list — every plant there is ASPCA non-toxic to cats and dogs.

Full hydrangea 'endless summer' pet-safety