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Eryngium planum 'Blaukappe'

Blue cap sea holly

Native to Europe and Asia (cultivar)


Vivid blue flowers seem other worldly, and stand erect on sturdy upright wiry stems with spiny bracts and foliage. Bees love the flowers as much as you will in a vase, and with such a long flowering season, all will be happy.  Deer, rabbit, and drought tolerant, and extremely salt tolerant.  

Creates structure for the fall and winter garden, and perfect along a winter salted parking lot, or dry meadow.  Alkaline soil tolerant as well.


24-28 in


2 ft


2-3 ft

USDA Hardiness Zone:


Bloom Color:

Deep Blue

Eryngium planum 'Blaukappe' Characteristics

Attracts Wildlife

  • Songbirds
  • Pollinators
  • Butterflies


  • Rock Garden
  • Cut Flower
  • Reblooming
  • Clay Soil
  • Naturalizing
  • Long Blooming
  • Interesting Foliage
  • Drought Tolerant
  • Dried Flower


  • Full Sun

Deer Resistant

  • Deer Resistant

Flowering Months

  • September
  • August
  • July
  • June

Foliage Color

  • Green
  • Gray-Green

Growth Rate

  • Medium

Juglans nigra Tolerance (Black Walnut)

  • Yes


  • Pb-Lead
  • Cu-Copper

Salt Tolerance

  • High

Season of Interest (Foliage)

  • Fall
  • Summer
  • Spring
  • Winter

Soil Moisture Preference

  • Dry

Plants that work well with Eryngium planum 'Blaukappe'

Calico aster Calico aster (Aster lateriflorus 'Lady in Black')
Purple Prairie Clover Purple Prairie Clover (Dalea purpurea)
Prairie junegrass Prairie junegrass (Koeleria macrantha)
Butterfly weed Butterfly weed (Asclepias tuberosa)
Little bluestem - 2022 Perennial Plant of the Year Little bluestem - 2022 Perennial Plant of the Year (Schizachyrium scoparium 'The Blues')
Ornamental oregano Ornamental oregano (Origanum laevigatum 'Herrenhausen')

Substitutions for Eryngium planum 'Blaukappe'

Purple coneflower Purple coneflower (Echinacea purpurea)
White coneflower White coneflower (Echinacea purpurea 'White Swan')
Wild quinine Wild quinine (Parthenium integrifolium)
Rattlesnake master Rattlesnake master (Eryngium yuccifolium)