Striking biennial with a basal rosette of soft fuzzy leaves in year one and a tall flowering spike (1.5–2 m) in year two. Traditional respiratory and ear-infection herb.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 3–9 | −40 °C to −1.1 °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 3–9 | −34 °C and warmer | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 1–5 | −15 °C to 10 °C | Plant tolerates down to this zone |
Growing notes
- Self-seeds heavily — biennial life cycle means you need plants at both stages for continuity
- Flower spike is a useful midsummer landmark in wild plantings
- Always consult a qualified medical or herbal practitioner before using any plant medicinally
Categories
Related plants
Cross-check Mullein against your zones