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Eryngium maritimum

Sea holly

Garden

Wishlist

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Features

  • BloomsJuly to August
  • Height0.15m to 0.6m
  • Spread0.3m to 0.4m
  • Growth HabitClump
  • Flower ColourLight blue-purple
  • Leaf ColourGreen-blue shades

Description

Eryngium maritimum (Sea holly). This clump-forming, deciduous perennial herb from Britain. Grows to a height and spread of 60cm. The metallic light blue-purple flowers occur in dense, thick heads, surrounded by bluish bracts in mid-summer. The spiny edged spinose, lobed leaves are conspicuously veined. This plant is often found in the wild in Northern Europe. STEM: More or less upright, thick, branched, hollow. ROOT: Long, thick, fleshy. HAIRS: Absent STIPULES: Absent LEAF-STALK: Present or upper absent. BRACTS: Leaf-like, spiny below head; 3-toothed below flowers. FLOWER STALK: Absent SEPALS: 5, thin, spine-tipped. PETALS: 5, narrow, notched. STAMENS: 5, curved inwards. STIGMA: 2, slender. OVARY: 1, below sepals, 2-celled. SEEDS: 1 per half, not released.

Characteristics

Perennial, Deciduous, Fragrant

Other common names

Sea holm, Sea eryngium

Origin

Britain

Interest and use

Wildflower/meadow Summer/Autumn interest. Suitable for coastal conditions.

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Needs

  • LightFull sun
  • HardinessFully hardy (min -15°C)
  • SoilLight, Medium, Sandy, Poor quality
  • Soil pH9.0 to 7.0
  • WaterDry

Cultivation

They are fully to half hardy. Grow in sun with fertile well drained soil.

Propagation

Propagate species from fresh seed; selected forms by root cuttings in winter or by division in spring.

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