Prehistoric ancestor of the modern flora — the lineage is 300 million years old. Highly siliceous shoots are used in biodynamic preparations as a fungicidal foliar spray.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 2–9 | −45.6 °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 2–9 | −40 °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
- Dynamic accumulator — concentrates silica at exceptional levels (up to 10% of dry weight)
- EXTREMELY INVASIVE and near-impossible to eradicate once established — spreads by deep rhizomes that regenerate from any fragment. Plant only with extreme caution, ideally harvest from existing wild populations rather than introducing.
- Equisetum tea or fermented extract used as a copper-free natural fungicide spray in biodynamic gardening
Categories
Related plants
Cross-check Horsetail (Scouring rush) against your zones