Alpine European sea holly with the largest and most spectacular flower heads of any Eryngium — domed steel-blue thimbles surrounded by elaborate finely cut feathery blue bracts.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 4–8 | −34.4 °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 4–8 | −29 °C to −1 °C | 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
- Plant in cool sunny borders — the showiest Eryngium for ornamental display, often described as the most beautiful flower of the European Alps
- Tolerates richer moister soils than most sea hollies — does not demand sharp drainage
- Distinct from other sea hollies in the database — alpinum has uniquely soft feathery bract collars
- Excellent cut and dried flower
Categories
Related plants
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