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Blue Hobbit Sea Holly

Eryngium planum 'Blue Hobbit'

This compact, short-statured perennial delivers a powerful punch of color and texture, making it a favorite for gardeners and florists alike. From a low-growing rosette of green basal leaves emerges an abundance of stiff, branched, silvery-blue stems topped with unique, egg-shaped, thistle-like purplish-blue flower heads that bloom profusely all summer long. A magnet for beneficial pollinators, this easy-care plant thrives on neglect, performing best in hot, dry sites with excellent drainage where many other perennials struggle.

Type

Perennial

Height

8

-12

in

Width

10

-12

in

Foliage Type

Deciduous

Sunlight

Full Sun

Water Requirements

Dry; requires excellent, sharp drainage; tolerant of drought once established

Foliage Color

Basal leaves are blue-green; stems and bracts are silvery-blue

Flower Color

Purplish-blue

Resists

  • Deer
  • Rabbits

Attracts

  • Bees
  • Butterflies
  • Pollinators

Design Use

  • Drought Tolerant

Special Traits

  • Showy Foliage
  • Fall Interest
  • Winter Interest
  • Black Walnut Tolerant

Hardiness Zones

4–8

Notes

Care: Deadhead spent blooms to encourage new flowers and prolong the bloom period; stems can be cut for fresh or dried floral arrangements at any time. The spiny bracts are prickly, so handle with care.
Soil & Establishment: This plant dislikes heavy clay and demands excellent drainage to prevent root rot; it will struggle in overly moist soil, which can cause sprawling. Ensure the soil dries out between waterings during the first two growing seasons, and do not overwater.
Winter Maintenance: Cut back spent flower stems and old foliage in late fall or early spring to encourage fresh growth.
Fertilizing: Minimal fertilizing is needed; too much fertilizer can reduce flowering or cause the plant to sprawl. A light application of compost in spring is usually sufficient.
Pests & Diseases: Highly resistant to most pests and diseases, though watch for slugs, snails, and aphids. Susceptible to root rot in poor-draining soils.
Habitat: Not applicable as it is not a US or MO native.
Wildlife: Attracts butterflies and beneficial pollinators as a food source.
Plant Uses: Excellent for Rock Gardens, Containers, Borders, and areas with hot, dry, poor soils.
Pet Safety: While the general species is not explicitly listed by the ASPCA as toxic to dogs or cats, related Eryngium species are known to cause issues, so caution is advised; the plant does feature thorns/prickles.
Other: The long taproot makes the plant difficult to move or divide once established, so plan its permanent location carefully.

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