Deciduous shrub with large rounded flower heads. Pink in alkaline soil, blue in acidic.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 5–9 | −28.9 °C to −1.1 °C | Plant tolerates down to this zone |
| RHS hardiness rating | H5 | −15 °C to −10 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 5–9 | −23 °C and warmer | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 2–5 | −10 °C to 10 °C | Plant tolerates down to this zone |
Growing notes
- Wilts quickly in afternoon sun and dry conditions
- Cut back in spring, not autumn — stems carry next year's buds
Pet caution: Hydrangea (mophead) is listed as potentially harmful to cats and/or dogs. Keep pets from grazing on it, and contact a vet if you suspect your animal has eaten some.
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