Plant library · hydrangea-macrophylla
Hydrangea
Hydrangea macrophylla
Toxic to cats and dogs
A thirsty outdoor shrub with big summer flower heads — the name means 'water vessel'. Keep the soil consistently moist; soil pH shifts the flower colour. Toxic to pets.
Toxicity
Toxic Usually mild
Signs, in the ASPCA's words
Vomiting, depression, diarrhea. Cyanide intoxication is rare - usually produces more of a gastrointestinal disturbance.
Toxic Usually mild
Signs, in the ASPCA's words
Vomiting, depression, diarrhea. Cyanide intoxication is rare - usually produces more of a gastrointestinal disturbance.
Source — ASPCA Animal Poison Control Center, toxic and non-toxic plant list; read from this species' own page
Pet-safety information is a general guide from the ASPCA's toxic-plant database and covers cats and dogs only. "If eaten" summarises the symptoms ASPCA lists for that plant; how an animal actually reacts depends on how much it ate and on the animal. It isn't exhaustive, isn't veterinary advice, and individual animals vary — never rely on it as the sole basis for a decision about your pet. If you think your pet has eaten a harmful plant, contact a vet immediately.
Care
- WaterEvery 3–5 days
- LightBright, indirect
- HumidityAverage humidity
- Temperature5–24 °C
The same interval the Sabz app schedules reminders from. In autumn and winter the app stretches it; see houseplants in autumn.
Common problems
- Wilting in sun — thirsty; hydrangeas droop fast when dry
- Brown flower heads — heat or drying out
- Few flowers — pruned at the wrong time, or too much shade
In the app
Add a hydrangea to Sabz and the watering interval above becomes a reminder, the toxicity verdict sits on the plant's own page, and when a leaf turns, the Check-up reads what you have actually logged to say why.
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