Eastern North American woodland perennial with finely divided foliage and deep blue berries. Listed for reference; significant toxicity precludes home use.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 3–8 | −40 °C to −6.7 °C | Plant tolerates down to this zone |
| RHS hardiness rating | H7 | down to −20 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 3–8 | −34 °C to −1 °C | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 1–4 | −15 °C to 5 °C | Plant tolerates down to this zone |
Growing notes
- Reference entry only — significant toxicity. Historical use as labour stimulant has been linked to serious infant cardiac complications and is no longer considered safe practice.
- Strongly contraindicated in pregnancy
- Always consult a qualified medical or herbal practitioner before using any plant medicinally
Pet caution: Blue cohosh 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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Related plants
Cross-check Blue cohosh against your zones