Icon Legend

New Plant
New/Featured for 2019

Full Sun
Full Sun

Partial Shade
Partial Shade

Shade Lover
Full Shade

Drought Tolerant
Drought Tolerant

Picture Available
Picture Available

Drawing Available
Drawing Available

(PPAF) = Propagation of this plant prohibited without a license.

Hardiness Zone Map


Eryngium

Eryngium

Sea Holly

From its leathery lobed leaves to the spiny decorative bracts that host the flower, the dynamic Sea Holly has a sense of movement that is up and out. Excellent in fresh or dried arrangements, the flowers are borne on tall branching stems, and the terminal blooms hold their color while lateral flowers develop, until the entire stem is covered with mature blossoms. Eryngiums love sharp-draining soil in the open sun, and are an arresting ad­dition to the mixed border, especially when planted amidst Rudbeckia, Achillea and grasses.

Evoking images of ornate Elizabethan ruffs and flaunting an unsurpassed beauty, this stalwart subalpine European native has been continually cultivated since the 1500s. Wildly popular among bees, butterflies and florists, the dense cone-shaped gunmetal-blue flower heads reside on feathery, soft-to-the-touch collars, each composed of 12 to 18 finely divided, upward curving silver-blue bracts. Stout cerulean-hued stalks with upper, 3-lobed bluish-green leaves elevate the sensational display, while an attractive, green basal rosette of toothed, heart-shaped foliage is sustained by a large taproot that detests being disturbed.

Blooms July–September

Size: 18" – 2-1/2' high x 18" – 2-1/2' wide.

Hardy to zone 5.

This cold-hardy species yields up-curving bracts that are long spiny slivers of silver plus thistle-like metallic-blue blossoms, surmounting branched stems that are tinted blue on their upper extremities. Marked with a smattering of mercury-hued speckles and white veining, deeply cut, gray-green leaves make a low-lying rosette for the unique floral phenomenon.

Blooms July|#8211;September

Size: 2' 0" high x 18" wide.

Hardy to zone 4.

This hardy Eryngium is all about blue—the electrifying, iridescent kind that promises to tantalize any garden visitor. A Blooms of Bressingham introduction, ‘Big Blue’s spine-edged green foliage and thick stems create an intriguing candelabra-shaped base for the bright 4 in. wide inflorescences. A blue drama is yours for the viewing as frosty white bracts and green cones, over the course of several weeks, gradually transmute stunning cerulean shades, imbuing even the stalks below. (PPAF)

Blooms July|#8211;September

Size: 2' 0" – 2-1/2' high x 15" – 18" wide.

Zone 4/5.

<i>Eryngium bourgatii</i>

Hailing from the Pyrenees, this easily grown perennial boasts a compact clump of crisp undulating gray-green foliage and decorative thistlelike blooms. The distinctive ground-level leaves are artfully chiseled into narrow segments and etched with striking broad white veins. Mustering long lasting cool-colored intrigue, the round, medium-sized blue-green flowers are tended by long iron gray linear bracts.

Blooms July–August.

Size: 12" high x 12" wide.

Hardy to zone 5.

<i>Eryngium planum</i> ‘Blaukappe’

With silvered, narrow spiky ruffs that cradle metallic blue round flower heads, ‘Blaukappe’ makes a sterling addition to dried or fresh bouquets. The vividly colored “blue caps” crest stiff-branched, sturdy bluish stems arising from a handsome green basal rosette of coarsely toothed, rounded and leathery foliage. Let its fantastic mercury-hued accents temper the bronzed blades of Stipa arundinacea.

Blooms June–September.

Size: 2' 0" – 2-1/4' high x 18" wide.

Hardy to zone 4.

Eryngium planum ‘Blue Glitter’ (P-1446)

Each $7.75

AVAILABLE MID SEPTEMBER 2019

Pressing upward through fine saw-toothed, green succulent-like leaves, an abundance of multibranched pewter-blue stems yields some 85 ½-in. shimmering blue pincushions perched on spiny collars. This new Ernst Benary selection promises to inspire gardeners and florists alike with a taller sturdy stature and profuse brilliantly colored blooms, which mature quickly and make long lasting cut flowers.

Blooms July – September.

Size: 2' 0" – 3' 0" high x 8" – 10" wide.

Hardy to zone 5.

Though this adorable Sea Holly is brimming with cuteness and blue in a big way, its trim globular mound stays small. A dwarf compact rosette of toothed, thick dark green leaves unleashes stiff silver-blue stems and egg-shaped spiny purplish blue heads that appear in wondrous droves all summer long. True to its name and tenacious to boot, ‘Blue Hobbit’s diminutive bearing can be easily tucked into tight spots such as containers, between steps or atop stone walls.

Blooms July–September

Size: 8" – 12" high x 10" – 12" wide.

Hardy to zone 4.

A snowy white multitude of plump conical flower heads perch atop pointed, widely spaced silver bracts. Leafy multibranching stems, pearly hued and steadfast, bolster the luminous blooms, while arising from an attractive dark green basal rosette defined by serrated leatherlike leaves and red-tinted petioles. Pair ‘Silver Salentino’ with Eryngium ‘Blue Glitter’ for a classic look.

Blooms July – September.

Size: 2-1/2' – 3' 0" high x 15" – 18" wide.

Hardy to zone 4.

Eryngium planum ‘White Glitter’ (P-2040)

Each $8.25

AVAILABLE LATE AUGUST 2019

Lauded as the classy pearlescent twin to Eryngium ‘Blue Glitter’, this nonfuss, bee-friendly perennial affords a scintillating spectacle of dense egg-shaped white flowers with prominent, spiky pewter-colored bracts. The well-branched gray-green flowering stalks emerge from a neat, low growing globular mound forged by glossy, toothed dark green leaves. Pest-free ‘White Glitter’ handles dry conditions plus makes a long-lasting, luminous addition to containers, natural-style plantings or cottage gardens.

Blooms July–September

Size: 2' 0" – 3' 0" high x 8" – 10" wide.

Hardy to zone 5.

An interesting combination of the prehistoric and the refined, this evergreen Eryngium is known for its large-coned, luminous flowers. Linear leaves emerge from a basal rosette with widely spaced spines along their margins. A dramatic collar of upturned, unequal steely green bracts, some reaching the striking breadth of 5 to 6 in. across, serves up central, sea-green flower heads reminiscent of a Protea. Ideal for dried arrangements, this exotic Mexican perennial demands a warm, sunny site with well drained, fertile soil. Give it a blue pot on the patio or another prominent location to bring its remarkable show in-to full view.

Blooms July–September.

Size: 2-1/2' – 3' 0" high x 2' 0" wide.

Hardy to zone 8.

<i>Eryngium</i> ‘Sapphire Blue’

Distinguished from other Sea Hollies by the intense, steel-blue hue infusing its branched stems, upper leaves, and teasel-shaped flowers, ‘Sapphire Blue’ features huge blossoms nestled in dramatic collarlike bracts. With a stance that’s angular yet erect, this sturdy perennial makes a striking counterpoint to the downy white softness of Salvia argentea. (pp#11,088)

Blooms July – August.

Size: 2-1/4' high x 18" wide.

Hardy to zone 5.

<i>Eryngium variifolium</i>

The Moroccan Sea Holly is as valuable for its unusual dark and evergreen marbled foliage as for its steel blue flowers set on spiny, silvery bracts atop thick, erect silver-blue stems. Smaller than other Eryngiums, Eryngium variifolium is well suited for an up-front position in the border, in a rock garden or in a container.

Blooms July–August.

Size: 18" high x 10" wide.

Hardy to zone 5.

<i>Eryngium yuccifolium</i>

Smelling like a carrot, looking a bit like a Yucca and once used by pioneers and Native Americans as an antidote to rattlesnake venom, this American tall-grass prairie dweller brandishes bold, lax bluish green rosettes. Characterized by parallel veins, bristly edges and a glaucous finish, the 3 ft. long sword-shaped leaves launch a sculptural wonder of tight set thistle-style greenish white spheres and pointed ivory bracts held within branched clusters on smooth stiff stems. A low maintenance perennial that provides fantastic winter interest, Rattlesnake Master obliges dry rocky soil and looks compelling planted with Sesleria heufleriana or Pennisetum spathiolatum.

Blooms July|ndash;September

Size: 3' 0" – 4' 0" high x 18" – 2' 0" wide.

Hardy to zone 3.

Stylish gleaming green leaves–thick, toothed and tattooed with prominent ivory-colored veins–uphold a fantastic architecture of staunch angular branched stems and extra large teasel-like flowers bathed in galvanizing bright blue hues. Brandishing long lasting late season blooms that honeybees cherish, ‘Jos Eijking’ is best suited for the front of an uncrowded bed, where its extraordinary bearing beguiles any visitor, even in wintertime.

Blooms July–September.

Size: 2' 0" high x 18" wide.

Hardy to zone 5.

  • Catalog Navigation Menu Top
  • Perennials at Digging Dog Nursery
    • Perennials: Acaena to Anthemis
    • Perennials: Anthriscus to Astrantia
    • Perennials: Baptisia to Cynoglossum
    • Perennials
    • Perennials: Fallopia to Gunnera
    • Perennials: Haloragis to Inula
    • Perennials: Kirengeshoma to Morina
    • Perennials: Nepeta to Pulmonaria
    • Perennials: Rheum to Succisella
    • Perennials: Teucrium to Yucca
  • Ornamental Grasses at Digging Dog Nursery
    • Grasses: Acorus to Deschampsia
    • Grasses: Elymus to Uncinia
  • Shrubs at Digging Dog Nursery
    • Shrubs: Arctostaphylos to Halimiocistus
    • Shrubs: Hebe to Weigela
  • Trees & Vines
  • List by Genus
  • Gift Certificates
  • T-Shirts
  • Gift Cards & Etchings
  • Slideshow
  • Gallery
  • Catalog Navigation Menu Bottom

Latest News

There does not seem to be any news today. Check back later!



Current Staff's Favorite Plant

Current Staff's Favorite Plant

Our featured plant: Crocosmia x crocosmiiflora ‘Honey Angels’

Colorful Crocosmias, Be Awed by your August garden, Saturday Strolls!

Click here to view our Late August 2019 Newsletter!

Colorful Crocosmias!

Crocosmias pack a punch of late summer color as our gardens transition into autumn. Their clustered tubular flowers populate the ends of gracefully arching spikes, which emerge from handsome sword-like foliage. Ranging from yellow, peach and orange to fiery red, their prismatic shades look exceptional with white flowering perennials such as Phlox ‘David’, Selinum wallichianum and Aster ‘Bridal Veil’, as well as the blue blossoms of Aconitum, Agapanthus ‘Storm Cloud’ or Aster ‘Twilight’. For fun you could create a hot border, blending them with Kniphofia, Helenium, Salvia and even other Crocosmia, plus be sure to include some in your next bouquet. Commonly referred to as Montbretia and hardy to Zone 6, they appreciate, good drainage, adequate water and some shade in scorching summer sun. Please feel free to check out our extensive collection of Crocosmia cultivars in the perennial section of our online catalog.

YES, it’s possible to be in awe of your late August garden….

At this point in the season, some areas in our gardens may appear a tad worn or lackluster. If you haven’t already done so, you may wish to cut back a few tired looking perennials, such as the Nepetas or Geraniums, so you can enjoy a fresh flourish of growth plus more blooms. Adequate moisture and an additional application of compost will also ensure late summer vigor. Incorporating plants that provide a bounty of flowers and alluring leaves in August and September helps buoy our spirits, and hopefully even inspire a little awe as we approach fall. Though the plants featured in this newsletter either promote a bold statement or possess more refined aspects, they equally caught my eye and made me pause to take a closer look. Perhaps they’ll spark a wondrous moment for you as well. All of us Digging Dog plant wranglers wish you Happy Digging!

Digging Dog Nursery Right Border