Coastal native perennial with steely-blue spiny leaves and architectural blue thistle-like flower heads. A signature plant of British shingle beaches.
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 | H6 | −20 °C to −15 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 5–8 | −23 °C to −1 °C | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 2–6 | −10 °C to 15 °C | Plant tolerates down to this zone |
Growing notes
- Outstanding forage for bees and solitary wasps
- Architectural seed heads persist through winter and feed seed-eating birds
- Drought tolerant and salt tolerant — perfect for coastal and gravel gardens
- Long taproot — does not transplant well, sow in place or use young plants
Categories
Related plants
Cross-check Sea holly against your zones