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❧ Pet Safe Plants

Hydrangea

Not listed does not mean safe.

Hydrangea — Hydrangea arborescens

H. Zell · CC BY-SA 3.0 · Photo source · shows: Hydrangea arborescens

Hydrangea arborescens

Also known as: Hortensia, Hills of Snow, Seven Bark

Family: Hydrangeaceae · ASPCA plant record

Verdict at a glance

🐱 Cats⚠ ToxicASPCA Toxic and Non-Toxic Plants
🐶 Dogs⚠ ToxicASPCA Toxic and Non-Toxic Plants
Show all animals

Evidence by animal

Sourced plant verdicts — read the original wording and scope
AnimalVerdictBasisPlant partsSourcesEvidence link
Companion mammals
CatsCats: ⚠ ToxicNot specified
ASPCA Toxic and Non-Toxic Plants Poison control
evidence
DogsDogs: ⚠ ToxicNot specified
ASPCA Toxic and Non-Toxic Plants Poison control
evidence
Horses & livestock
HorsesHorses: ⚠ ToxicNot specified
ASPCA Toxic and Non-Toxic Plants Poison control
evidence
Small mammals
RabbitsRabbits: ! CautionWHRS Class 2: local or weaker toxinNot specified
Wisconsin House Rabbit Society Rescue/education group
evidence
Birds
Pet birds (general)Pet birds (general): ! CautionVCA: on the may-be-poisonous list (not specifically reported)Not specified
VCA Animal Hospitals Veterinary reference
evidence
Reptiles
TortoisesTortoises: ⚠ ToxicTortoise Trust: listed as toxic, credible mortality reports (*)Not specified
Tortoise Trust Specialist charity
evidence

Source excerpts

ASPCA Toxic and Non-Toxic Plants — Cats, Dogs, Horses

poison-control

Toxic to Dogs, Toxic to Cats, Toxic to Horses

Source checked 2026-10-27

Read original source
Wisconsin House Rabbit Society — Classes of Toxic Plants — Rabbits

rescue-education

WHRS Class 2: local or weaker toxin · Wisconsin House Rabbit Society chapter list (G. Flentke, 2012): Class 2 — "Local toxins": "Allergens, dermal sensitivity toxins, or systemic toxins of lesser strengths" (list heading: "May cause allergic reaction in rabbits. Be cautious."). WHRS adds that, because rabbits inevitably chew items, these toxins "could be more of a problem than the current literature indicates".

Hydrangea

Source checked 2026-10-27

Read original source
VCA Animal Hospitals — Plants That Are Toxic to Birds — Pet birds (general)

veterinary-reference

VCA: on the may-be-poisonous list (not specifically reported) · VCA: on the list of "many plants which may be poisonous to birds, although it is not exhaustive"; no asterisk, so not specifically reported harmful in birds. VCA notes information is often inferred from other species.

Hydrangea

Source checked 2026-10-27 (source updated Aug 14, 2026)

Read original source
Tortoise Trust — Toxic Plants and Tortoises — Tortoises

specialist-charity

Tortoise Trust: listed as toxic, credible mortality reports (*) · Tortoise Trust toxic-plant list (from Highfield, The Tortoise and Turtle Feeding Manual, 2001): marked * = "credible cases where mortality has been reported following consumption".

Hydrangea*

Source checked 2026-10-27

Read original source
No evidence collected in this database yet for 17 animals

No evidence collected in this database yet for: Guinea pigs, Hamsters, Rats, Mice, Chinchillas, Ferrets, Parrots (macaws, Amazons, African greys…), Budgerigars (budgies), Cockatiels, Lovebirds, Canaries, Finches, Pigeons & doves, Bearded dragons, Iguanas, Goats, Chickens & other poultry

No supported claim has been collected for these animals. Not listed does not mean safe; do not infer suitability from another species.

Toxic principles

ASPCA, as published: Cyanogenic glycoside Source

Clinical signs

ASPCA, as published: Vomiting, depression, diarrhea. Cyanide intoxication is rare - usually produces more of a gastrointestinal disturbance. Source

Last verified (ASPCA record): 2026-10-27. Source access dates and limitations.