Eryngium planum
Eryngium planum
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Flat Sea Holly is an excellent architectural plant for the dry garden. Blue-tinged stems hold spiky, metallic blue flowers above a rosette of waxy, glaucous foliage. Pollinators adore the unusual flowers!
Dried flowers lend interest to the winter garden and are a boon to the birds.
This plant prefers to grow in poor, sandy soils and will tolerate salt. Staking required if grown in less than full sun or overly fertile soil.
Deer, rabbit, and drought resistant.
Zones: 5 to 9
Family: Apiaceae
Type: Perennial
Height: 24 to 36 in.
Spread: 12 to 24 in.
Exposure: Full Sun
Soil Conditions: dry, well-drained, average
Bloom Time: June to September
Bloom Color: Blue
Native Range: Central and southeastern Europe
Image Credits:
- Image 1 (blooms) Danny S., Public domain, via Wikimedia Commons
- Image 2 (form) photo taken by User:Nordelch in July 2005, via Wikimedia Commons
- Image 3 (foliage) Photo by David J. Stang, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
- Image 4 (winter interest) Agnieszka Kwiecień, Nova, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons