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Are Hydrangeas Poisonous to Cats? Keep Them Away!

2026-02-04 CatsLives Team 3 min read

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Hydrangeas are a staple in many gardens due to their large, colorful blooms. But if your cat has access to the garden, you need to be careful.

The Toxic Component

Hydrangeas contain cyanogenic glycosides. This sounds scary, and it is. When chewed or digested, these compounds can release cyanide. Fortunately, for a cat to be seriously poisoned, they would need to eat a fairly large amount of the plant.

Symptoms of Poisoning

If your cat nibbles on your hydrangeas, you might observe:

What to Do

Since the toxins can affect the system quickly, it is always best to contact your vet if you suspect your cat has eaten any part of a hydrangea, especially the leaves or flowers.

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Conclusion

Hydrangeas are beautiful, but they belong in the "look but don't eat" category for our feline friends.

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