Sea holly
Common Name: Sea holly
Genus: Eryngium
Species: x oliverianum
Skill Level: Beginner
Exposure: Full sun
Hardiness: Hardy
Soil type: Well-drained/light, Moist, Sandy
Height: 90cm
Spread: 45cm
Time to divide plants: March to May
Flowering period:
July
to
September
Sea hollies are striking plants for a summer border but only thrive where drainage is particularly good - they will not tolerate winter wet. E. x oliveranum is one of the most useful, having large vivid blue flowers with dark green, clearly veined leaves forming a loose rosette at the base of the plant. It survives in a wider range of soil types than many more difficult eryngiums, and can even cope with poor gravelly soil and heavier ground if it never becomes waterlogged. The flowers attract bees and other insects, and are good for cutting or drying. The Royal Horticultural Society has given it its prestigious Award of Garden Merit (AGM).
Looks good with:
Perovskia 'Blue Spire'Stachys byzantina
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